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Segment disclosures

Company overview

ATMOS ENERGY CORP

Each reported dimension combination stays separate. Revenue and operating income are shown as reported, with their dates and sources.

Revenue · Reported segment facts

167 dimension combinations 776 retained observations 16 reported periods Partial retained history

Counts describe retained dimensioned rows only. Periods and members can change across reports, and this view does not infer missing values or expected segment totals.

Intersegment Elimination · Distribution Segment

Consolidation Items · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-30-749000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-30-2295000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2026-01-01 – 2026-03-31-769000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-31-1546000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-31-777000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-10-01 – 2025-09-30-3042000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2025-04-01 – 2025-06-30-752000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-30-2304000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-01-01 – 2025-03-31-786000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-31-1552000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-31-766000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2023-10-01 – 2024-09-30-3007000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2024-04-01 – 2024-06-30-765000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-30-2271000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-01-01 – 2024-03-31-787000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-31-1506000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-31-719000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2022-10-01 – 2023-09-30-3029000 RestatedUSD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-04-01 – 2023-06-30808000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-302314000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2022-12-31733000 USD2023-02-08 · 02:50:36.000ZOpen filing evidence
2021-10-01 – 2022-09-30-3258000 RestatedUSD2024-11-19 · 02:20:38.000ZOpen filing evidence

Intersegment Elimination · Pipelineand Storage Segment

Consolidation Items · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-30-227903000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-30-633798000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2026-01-01 – 2026-03-31-203798000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-31-405895000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-31-202097000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-10-01 – 2025-09-30-784900000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2025-04-01 – 2025-06-30-199994000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-30-578193000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-01-01 – 2025-03-31-190239000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-31-378199000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-31-187960000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2023-10-01 – 2024-09-30-684976000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2024-04-01 – 2024-06-30-181577000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-30-503552000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-01-01 – 2024-03-31-164654000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-31-321975000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-31-157321000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2022-10-01 – 2023-09-30-606478000 RestatedUSD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-04-01 – 2023-06-30160751000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-30445952000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2021-10-01 – 2022-09-30-523934000 RestatedUSD2024-11-19 · 02:20:38.000ZOpen filing evidence

Operating Segments · Commercial Customers · Gassalesrevenue · Pipelineand Storage Segment

Consolidation Items · Major Customers · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2023-09-300 USD2023-11-15 · 01:29:24.000ZOpen filing evidence
2021-10-01 – 2022-09-300 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Operating Segments · Industrial Customers · Gassalesrevenue · Pipelineand Storage Segment

Consolidation Items · Major Customers · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2023-09-300 USD2023-11-15 · 01:29:24.000ZOpen filing evidence
2021-10-01 – 2022-09-300 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Operating Segments · Industrial Customers · Distribution Segment · Gassalesrevenue

Consolidation Items · Major Customers · Statement Business Segments · Product Or Service

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2023-09-30151538000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence
2021-10-01 – 2022-09-30224427000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Operating Segments · Residential Customers · Gassalesrevenue · Pipelineand Storage Segment

Consolidation Items · Major Customers · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2023-09-300 USD2023-11-15 · 01:29:24.000ZOpen filing evidence
2021-10-01 – 2022-09-300 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Operating Segments · Residential Customers · Distribution Segment · Gassalesrevenue

Consolidation Items · Major Customers · Statement Business Segments · Product Or Service

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2023-09-302606658000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence
2021-10-01 – 2022-09-302472461000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Operating Segments · Gassalesrevenue · Commercial Customers · Distribution Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-301145710000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-301006593000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-301100773000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Commercial Customers · Distribution Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-31469001000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-31784566000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-31315565000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-30213377000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-30959539000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-31480108000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-31746162000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-31266054000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-30169508000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-30851462000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence

Operating Segments · Gassalesrevenue · Commercial Customers · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Commercial Customers · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-310 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-310 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2023-12-310 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2022-10-01 – 2022-12-310 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Operating Segments · Gassalesrevenue · Industrial Customers · Distribution Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-30122284000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-30100363000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-30151538000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Industrial Customers · Distribution Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-3144479000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-3177340000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-3132861000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-3027369000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-3092575000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-3138885000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-3165206000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-3126321000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-3021160000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-3079810000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence

Operating Segments · Gassalesrevenue · Industrial Customers · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Industrial Customers · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-310 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-310 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2023-12-310 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2022-10-01 – 2022-12-310 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Operating Segments · Gassalesrevenue · Public Authorityand Other Customers · Distribution Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-3051354000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-3051337000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-3061345000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Public Authorityand Other Customers · Distribution Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-3115458000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-3125535000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-3110077000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-308920000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-3045722000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-3123921000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-3136802000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-3112881000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-308177000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-3043881000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence

Operating Segments · Gassalesrevenue · Public Authorityand Other Customers · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2021-10-01 – 2022-09-300 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Public Authorityand Other Customers · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-310 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-310 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence

Operating Segments · Gassalesrevenue · Residential Customers · Distribution Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-302877456000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-302542438000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-302606658000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Residential Customers · Distribution Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-311219792000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-312000204000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-31780412000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-30473478000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-302475219000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-311308691000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-312001741000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-31693050000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-30384957000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-302177935000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence

Operating Segments · Gassalesrevenue · Residential Customers · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Residential Customers · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-310 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-310 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence

Operating Segments · Gassalesrevenue · Distribution Segment

Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-304196804000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-303700731000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-303920314000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2021-10-01 – 2022-09-303883901000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Distribution Segment

Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-311748730000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-312887645000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-311138915000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-30723144000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-303573055000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-311851605000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-312849911000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-31998306000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-30583802000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-303153088000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-01-01 – 2024-03-311521536000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-312569286000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-311047750000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2022-10-01 – 2022-12-311423759000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Distribution Segment · Commercial Customers

Consolidation Items · Product Or Service · Statement Business Segments · Major Customers

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2023-12-31277253000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2022-10-01 – 2022-12-31388667000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Distribution Segment · Industrial Customers

Consolidation Items · Product Or Service · Statement Business Segments · Major Customers

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2023-12-3128231000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2022-10-01 – 2022-12-3159215000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Distribution Segment · Public Authorityand Other Customers

Consolidation Items · Product Or Service · Statement Business Segments · Major Customers

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2023-12-3114584000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2022-10-01 – 2022-12-3122826000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Distribution Segment · Residential Customers

Consolidation Items · Product Or Service · Statement Business Segments · Major Customers

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2023-12-31727682000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2022-10-01 – 2022-12-31953051000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Operating Segments · Gassalesrevenue · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-300 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2021-10-01 – 2022-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-310 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-310 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-310 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-300 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-01-01 – 2024-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-310 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2022-10-01 – 2022-12-310 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Pipelineand Storage Segment · Public Authorityand Other Customers

Consolidation Items · Product Or Service · Statement Business Segments · Major Customers

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2023-12-310 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2022-10-01 – 2022-12-310 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Operating Segments · Gas Sales Revenue · Pipelineand Storage Segment · Residential Customers

Consolidation Items · Product Or Service · Statement Business Segments · Major Customers

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2023-12-310 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2022-10-01 – 2022-12-310 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Operating Segments · Miscellaneousrevenue · Distribution Segment

Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:MiscellaneousrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-3013123000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-3011836000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-3010044000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2021-10-01 – 2022-09-3010282000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Operating Segments · Miscellaneous Revenue · Distribution Segment

Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:MiscellaneousRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-313461000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-316299000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-312838000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-303326000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-3010570000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-314222000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-317244000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-313022000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-302681000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-309048000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-01-01 – 2024-03-313724000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-316367000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-312643000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence

Operating Segments · Miscellaneousrevenue · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:MiscellaneousrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-3012749000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-3015892000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-3012180000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2021-10-01 – 2022-09-3013679000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Operating Segments · Miscellaneous Revenue · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:MiscellaneousRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-313351000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-315981000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-312630000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-304656000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-3011579000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-314259000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-316923000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-312664000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-307592000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-3012796000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-01-01 – 2024-03-312162000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-315204000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-313042000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence

Operating Segments · Transportationrevenue · Distribution Segment

Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:TransportationrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-30151876000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-30134600000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-30121420000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2021-10-01 – 2022-09-30113043000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Operating Segments · Transportation Revenue · Distribution Segment

Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:TransportationRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-3144363000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-3185841000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-3141478000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-3035908000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-30115987000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-3143352000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-3180079000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-3136727000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-3030773000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-30102147000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-01-01 – 2024-03-3137607000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-3171374000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-3133767000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence

Operating Segments · Transportationrevenue · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:TransportationrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-301119015000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-30982795000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2023-12-31215305000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2022-10-01 – 2023-09-30811968000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2022-12-31195252000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2021-10-01 – 2022-09-30707205000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Operating Segments · Transportation Revenue · Pipelineand Storage Segment

Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:TransportationRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2026-01-01 – 2026-03-31318780000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-31636183000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-31317403000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2025-04-01 – 2025-06-30284103000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-10-01 – 2025-06-30816646000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2025-01-01 – 2025-03-31266514000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-31532543000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-31266029000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-04-01 – 2024-06-30260779000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-30699243000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-01-01 – 2024-03-31223159000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-31438464000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-31215305000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence

Operating Segments · Distribution Segment

Consolidation Items · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-30774658000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-303911164000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2026-01-01 – 2026-03-311877680000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-313136506000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-311258826000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-10-01 – 2025-09-304425397000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2025-04-01 – 2025-06-30767132000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-303758995000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-01-01 – 2025-03-311882528000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-312991863000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-311109335000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2023-10-01 – 2024-09-303915141000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2024-04-01 – 2024-06-30633211000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-303327730000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-01-01 – 2024-03-311589181000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-312694519000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-311105338000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2022-10-01 – 2023-09-304099690000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-04-01 – 2023-06-30616067000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-303556703000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2022-12-311440426000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2021-10-01 – 2022-09-304035194000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Operating Segments · Distribution Segment · Commercial Customers · Gassalesrevenue

Consolidation Items · Statement Business Segments · Major Customers · Product Or Service

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2023-09-301100773000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence
2021-10-01 – 2022-09-301120322000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Operating Segments · Distribution Segment · Gassalesrevenue

Consolidation Items · Statement Business Segments · Product Or Service

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2023-09-303920314000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence
2021-10-01 – 2022-09-303883901000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Operating Segments · Distribution Segment · Gassalesrevenue · Public Authorityand Other Customers

Consolidation Items · Statement Business Segments · Product Or Service · Major Customers

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2023-09-3061345000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence
2021-10-01 – 2022-09-3066691000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Operating Segments · Distribution Segment · Miscellaneousrevenue

Consolidation Items · Statement Business Segments · Product Or Service

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:MiscellaneousrevenueMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2023-09-3010044000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence
2021-10-01 – 2022-09-3010282000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Operating Segments · Distribution Segment · Transportationrevenue

Consolidation Items · Statement Business Segments · Product Or Service

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:TransportationrevenueMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2023-12-3133767000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2022-10-01 – 2023-09-30121420000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence
2022-10-01 – 2022-12-3132162000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2021-10-01 – 2022-09-30113043000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Operating Segments · Pipelineand Storage Segment

Consolidation Items · Statement Business Segments

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-30333053000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-30908975000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2026-01-01 – 2026-03-31289289000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-31575922000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-31286633000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-10-01 – 2025-09-301065300000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2025-04-01 – 2025-06-30272388000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-30786777000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-01-01 – 2025-03-31258999000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-31514389000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-31255390000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2023-10-01 – 2024-09-30938029000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2024-04-01 – 2024-06-30250680000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-30685336000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-01-01 – 2024-03-31223487000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-31434656000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-31211169000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2022-10-01 – 2023-09-30785174000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-04-01 – 2023-06-30208225000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-30579278000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2023-01-01 – 2023-03-31184424000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-31371053000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2022-12-31186629000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2021-10-01 – 2022-09-30693660000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Operating Segments · Pipelineand Storage Segment · Miscellaneousrevenue

Consolidation Items · Statement Business Segments · Product Or Service

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:MiscellaneousrevenueMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-311152000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-313874000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Operating Segments · Pipelineand Storage Segment · Transportationrevenue

Consolidation Items · Statement Business Segments · Product Or Service

Source dimensions srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:TransportationrevenueMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-31190248000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-31385500000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Commercial Customers · Operating Segments · Gassalesrevenue · Distribution Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:CommercialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2024-09-301006593000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2022-10-01 – 2023-09-301100773000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2021-10-01 – 2022-09-301120322000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Commercial Customers · Operating Segments · Gas Sales Revenue · Distribution Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:CommercialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2025-01-01 – 2025-03-31480108000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2025-03-31746162000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2024-12-31266054000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2024-01-01 – 2024-03-31404701000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-31681954000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-31277253000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence

Commercial Customers · Operating Segments · Gassalesrevenue · Pipelineand Storage Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:CommercialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2024-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2022-10-01 – 2023-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2021-10-01 – 2022-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Commercial Customers · Operating Segments · Gas Sales Revenue · Pipelineand Storage Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:CommercialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2025-01-01 – 2025-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2025-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2024-12-310 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2024-01-01 – 2024-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-310 USD2025-02-05 · 02:43:09.000ZOpen filing evidence

Commercial Customers · Natural Gas Us Regulated · Distribution Segment

Major Customers · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:CommercialCustomersMember;srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2024-09-301016675000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2022-10-01 – 2023-09-301112236000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2021-10-01 – 2022-09-301126189000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Commercial Customers · Distribution Segment · Operating Segments · Gas Sales Revenue

Major Customers · Statement Business Segments · Consolidation Items · Product Or Service

Source dimensions srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember
PeriodValueUnitFiledEvidence
2024-01-01 – 2024-03-31404701000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-31681954000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-01-01 – 2023-03-31398812000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-31787479000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Commercial Customers · Distribution Segment · Natural Gas Us Regulated

Major Customers · Statement Business Segments · Product Or Service

Source dimensions srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember
PeriodValueUnitFiledEvidence
2021-10-01 – 2022-09-301126189000 USD2022-11-15 · 02:37:34.000ZOpen filing evidence

Commercial Customers · Pipelineand Storage Segment · Operating Segments · Gas Sales Revenue

Major Customers · Statement Business Segments · Consolidation Items · Product Or Service

Source dimensions srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember
PeriodValueUnitFiledEvidence
2024-01-01 – 2024-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-01-01 – 2023-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Industrial Customers · Operating Segments · Gassalesrevenue · Distribution Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:IndustrialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2024-09-30100363000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2022-10-01 – 2023-09-30151538000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2021-10-01 – 2022-09-30224427000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Industrial Customers · Operating Segments · Gas Sales Revenue · Distribution Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:IndustrialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2025-01-01 – 2025-03-3138885000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2025-03-3165206000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2024-12-3126321000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2024-01-01 – 2024-03-3130419000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-3158650000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-3128231000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence

Industrial Customers · Operating Segments · Gassalesrevenue · Pipelineand Storage Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:IndustrialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2024-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2022-10-01 – 2023-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2021-10-01 – 2022-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Industrial Customers · Operating Segments · Gas Sales Revenue · Pipelineand Storage Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:IndustrialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2025-01-01 – 2025-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2025-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2024-12-310 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2024-01-01 – 2024-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-310 USD2025-02-05 · 02:43:09.000ZOpen filing evidence

Industrial Customers · Natural Gas Us Regulated · Distribution Segment

Major Customers · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:IndustrialCustomersMember;srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2024-09-30100596000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2022-10-01 – 2023-09-30151970000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2021-10-01 – 2022-09-30224632000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Public Authorityand Other Customers · Operating Segments · Gassalesrevenue · Distribution Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2024-09-3051337000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2022-10-01 – 2023-09-3061345000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2021-10-01 – 2022-09-3066691000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Public Authorityand Other Customers · Operating Segments · Gas Sales Revenue · Distribution Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2025-01-01 – 2025-03-3123921000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2025-03-3136802000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2024-12-3112881000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2024-01-01 – 2024-03-3121120000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-3135704000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-3114584000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence

Public Authorityand Other Customers · Operating Segments · Gassalesrevenue · Pipelineand Storage Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2024-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2022-10-01 – 2023-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2021-10-01 – 2022-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Public Authorityand Other Customers · Operating Segments · Gas Sales Revenue · Pipelineand Storage Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2025-01-01 – 2025-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2025-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2024-12-310 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2024-01-01 – 2024-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-310 USD2025-02-05 · 02:43:09.000ZOpen filing evidence

Public Authorityand Other Customers · Gassalesrevenue · Operating Segments · Pipelineand Storage Segment

Major Customers · Product Or Service · Consolidation Items · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-310 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-310 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Public Authorityand Other Customers · Natural Gas Us Regulated · Distribution Segment

Major Customers · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2024-09-3052180000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2022-10-01 – 2023-09-3062476000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2021-10-01 – 2022-09-3066956000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Public Authorityand Other Customers · Distribution Segment · Operating Segments · Gas Sales Revenue

Major Customers · Statement Business Segments · Consolidation Items · Product Or Service

Source dimensions srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember
PeriodValueUnitFiledEvidence
2024-01-01 – 2024-03-3121120000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-3135704000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-01-01 – 2023-03-3122686000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-3145512000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Public Authorityand Other Customers · Pipelineand Storage Segment · Operating Segments · Gas Sales Revenue

Major Customers · Statement Business Segments · Consolidation Items · Product Or Service

Source dimensions srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember
PeriodValueUnitFiledEvidence
2024-01-01 – 2024-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-01-01 – 2023-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Residential Customers · Operating Segments · Gassalesrevenue · Distribution Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:ResidentialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2024-09-302542438000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2022-10-01 – 2023-09-302606658000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2021-10-01 – 2022-09-302472461000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Residential Customers · Operating Segments · Gas Sales Revenue · Distribution Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:ResidentialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2025-01-01 – 2025-03-311308691000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2025-03-312001741000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2024-12-31693050000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2024-01-01 – 2024-03-311065296000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-311792978000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-31727682000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence

Residential Customers · Operating Segments · Gassalesrevenue · Pipelineand Storage Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:ResidentialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2024-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2022-10-01 – 2023-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2021-10-01 – 2022-09-300 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Residential Customers · Operating Segments · Gas Sales Revenue · Pipelineand Storage Segment

Major Customers · Consolidation Items · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:ResidentialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2025-01-01 – 2025-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2025-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2024-10-01 – 2024-12-310 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2024-01-01 – 2024-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-310 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-310 USD2025-02-05 · 02:43:09.000ZOpen filing evidence

Residential Customers · Natural Gas Us Regulated · Distribution Segment

Major Customers · Product Or Service · Statement Business Segments

Source dimensions srt:MajorCustomersAxis=ato:ResidentialCustomersMember;srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2024-09-302583681000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2022-10-01 – 2023-09-302638689000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence
2021-10-01 – 2022-09-302492116000 USD2024-11-19 · 02:20:38.000ZOpen filing evidence

Residential Customers · Distribution Segment · Natural Gas Us Regulated

Major Customers · Statement Business Segments · Product Or Service

Source dimensions srt:MajorCustomersAxis=ato:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember
PeriodValueUnitFiledEvidence
2021-10-01 – 2022-09-302492116000 USD2022-11-15 · 02:37:34.000ZOpen filing evidence

Gas Sales Revenue · Operating Segments · Commercial Customers · Distribution Segment

Product Or Service · Consolidation Items · Major Customers · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-04-01 – 2023-06-30165930000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-30953409000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence

Gas Sales Revenue · Operating Segments · Commercial Customers · Pipelineand Storage Segment

Product Or Service · Consolidation Items · Major Customers · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2023-04-01 – 2023-06-300 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-300 USD2023-08-03 · 00:47:28.000ZOpen filing evidence

Gas Sales Revenue · Operating Segments · Residential Customers · Distribution Segment

Product Or Service · Consolidation Items · Major Customers · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-04-01 – 2023-06-30380099000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-302276240000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence

Gas Sales Revenue · Operating Segments · Distribution Segment

Product Or Service · Consolidation Items · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-04-01 – 2023-06-30578124000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-303411515000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence

Gassalesrevenue · Operating Segments · Pipelineand Storage Segment

Product Or Service · Consolidation Items · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-310 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-310 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Gas Sales Revenue · Operating Segments · Pipelineand Storage Segment

Product Or Service · Consolidation Items · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2023-04-01 – 2023-06-300 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-300 USD2023-08-03 · 00:47:28.000ZOpen filing evidence

Gassalesrevenue · Operating Segments · Pipelineand Storage Segment · Commercial Customers

Product Or Service · Consolidation Items · Statement Business Segments · Major Customers

Source dimensions srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-310 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-310 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Gassalesrevenue · Operating Segments · Pipelineand Storage Segment · Industrial Customers

Product Or Service · Consolidation Items · Statement Business Segments · Major Customers

Source dimensions srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-310 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-310 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Gassalesrevenue · Operating Segments · Pipelineand Storage Segment · Residential Customers

Product Or Service · Consolidation Items · Statement Business Segments · Major Customers

Source dimensions srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-310 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-310 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Gas Sales Revenue · Operating Segments · Pipelineand Storage Segment · Residential Customers

Product Or Service · Consolidation Items · Statement Business Segments · Major Customers

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember
PeriodValueUnitFiledEvidence
2023-04-01 – 2023-06-300 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-300 USD2023-08-03 · 00:47:28.000ZOpen filing evidence

Gassalesrevenue · Commercial Customers · Distribution Segment · Operating Segments

Product Or Service · Major Customers · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2021-10-01 – 2022-09-301120322000 USD2022-11-15 · 02:37:34.000ZOpen filing evidence

Gas Sales Revenue · Commercial Customers · Distribution Segment · Operating Segments

Product Or Service · Major Customers · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-30214797000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-30999363000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-30213377000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-30959539000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence

Gas Sales Revenue · Commercial Customers · Pipelineand Storage Segment · Operating Segments

Product Or Service · Major Customers · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence

Gas Sales Revenue · Industrial Customers · Operating Segments · Distribution Segment

Product Or Service · Major Customers · Consolidation Items · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-04-01 – 2023-06-3023533000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-30127792000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence

Gas Sales Revenue · Industrial Customers · Operating Segments · Pipelineand Storage Segment

Product Or Service · Major Customers · Consolidation Items · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2023-04-01 – 2023-06-300 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-300 USD2023-08-03 · 00:47:28.000ZOpen filing evidence

Gassalesrevenue · Industrial Customers · Distribution Segment · Operating Segments

Product Or Service · Major Customers · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-3159215000 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Gas Sales Revenue · Industrial Customers · Distribution Segment · Operating Segments

Product Or Service · Major Customers · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-3026464000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-30103804000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-3027369000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-3092575000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence

Gas Sales Revenue · Industrial Customers · Pipelineand Storage Segment · Operating Segments

Product Or Service · Major Customers · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence

Gas Sales Revenue · Public Authorityand Other Customers · Operating Segments · Distribution Segment

Product Or Service · Major Customers · Consolidation Items · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-04-01 – 2023-06-308562000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-3054074000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence

Gas Sales Revenue · Public Authorityand Other Customers · Operating Segments · Pipelineand Storage Segment

Product Or Service · Major Customers · Consolidation Items · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2023-04-01 – 2023-06-300 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-300 USD2023-08-03 · 00:47:28.000ZOpen filing evidence

Gassalesrevenue · Public Authorityand Other Customers · Distribution Segment · Operating Segments

Product Or Service · Major Customers · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-3122826000 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Gas Sales Revenue · Public Authorityand Other Customers · Distribution Segment · Operating Segments

Product Or Service · Major Customers · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-305757000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-3031292000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-308920000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-3045722000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence

Gas Sales Revenue · Public Authorityand Other Customers · Pipelineand Storage Segment · Operating Segments

Product Or Service · Major Customers · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence

Gassalesrevenue · Residential Customers · Distribution Segment · Operating Segments

Product Or Service · Major Customers · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-31953051000 USD2023-02-08 · 02:50:36.000ZOpen filing evidence
2021-10-01 – 2022-09-302472461000 USD2022-11-15 · 02:37:34.000ZOpen filing evidence

Gas Sales Revenue · Residential Customers · Distribution Segment · Operating Segments

Product Or Service · Major Customers · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-30462720000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-302462924000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-30473478000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-302475219000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence

Gas Sales Revenue · Residential Customers · Pipelineand Storage Segment · Operating Segments

Product Or Service · Major Customers · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence

Gassalesrevenue · Distribution Segment · Operating Segments

Product Or Service · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-311423759000 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Gas Sales Revenue · Distribution Segment · Operating Segments

Product Or Service · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-30709738000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-303597383000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-30723144000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-303573055000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence

Gassalesrevenue · Distribution Segment · Commercial Customers · Operating Segments

Product Or Service · Statement Business Segments · Major Customers · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GassalesrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-31388667000 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Gas Sales Revenue · Pipelineand Storage Segment · Operating Segments

Product Or Service · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-300 USD2026-08-06 · 00:54:06.000ZOpen filing evidence

Miscellaneousrevenue · Operating Segments · Distribution Segment

Product Or Service · Consolidation Items · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:MiscellaneousrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2023-12-312643000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2023-04-01 – 2023-06-302706000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-307650000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2022-12-312282000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Miscellaneousrevenue · Operating Segments · Pipelineand Storage Segment

Product Or Service · Consolidation Items · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:MiscellaneousrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2023-10-01 – 2023-12-313042000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2023-04-01 – 2023-06-304397000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-308271000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2022-12-312722000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Miscellaneousrevenue · Distribution Segment · Operating Segments

Product Or Service · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:MiscellaneousrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-312282000 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Miscellaneous Revenue · Distribution Segment · Operating Segments

Product Or Service · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:MiscellaneousRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-303011000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-309310000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-303326000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-3010570000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence

Miscellaneousrevenue · Pipelineand Storage Segment · Operating Segments

Product Or Service · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:MiscellaneousrevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-312722000 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Miscellaneous Revenue · Pipelineand Storage Segment · Operating Segments

Product Or Service · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:MiscellaneousRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-3011077000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-3017058000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-304656000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-3011579000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-01-01 – 2024-03-312162000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-315204000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-01-01 – 2023-03-311152000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-313874000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Natural Gas Other · Distribution Segment

Product Or Service · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:NaturalGasOtherMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-3026484000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-3026394000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-3011919000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Transportationrevenue · Operating Segments · Distribution Segment

Product Or Service · Consolidation Items · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:TransportationrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2023-04-01 – 2023-06-3027988000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-3093661000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence

Transportationrevenue · Operating Segments · Pipelineand Storage Segment

Product Or Service · Consolidation Items · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=ato:TransportationrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2023-04-01 – 2023-06-30212322000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence
2022-10-01 – 2023-06-30597822000 USD2023-08-03 · 00:47:28.000ZOpen filing evidence

Transportation Revenue · Distribution Segment · Operating Segments

Product Or Service · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:TransportationRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-3039498000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-30125339000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-3035908000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-30115987000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence

Transportation Revenue · Pipelineand Storage Segment · Operating Segments

Product Or Service · Statement Business Segments · Consolidation Items

Source dimensions srt:ProductOrServiceAxis=ato:TransportationRevenueMember;us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-30395186000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-301031369000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-04-01 – 2025-06-30284103000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-30816646000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-01-01 – 2024-03-31223159000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-31438464000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-01-01 – 2023-03-31190248000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-31385500000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Natural Gas Gathering Transportation Marketing And Processing · Distribution Segment

Product Or Service · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=us-gaap:NaturalGasGatheringTransportationMarketingAndProcessingMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-30149853000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-30132608000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-30119371000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Natural Gas Us Regulated · Commercial Customers · Distribution Segment

Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-301154591000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-301016675000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-301112236000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Natural Gas Us Regulated · Industrial Customers · Distribution Segment

Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-30122576000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-30100596000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-30151970000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Natural Gas Us Regulated · Public Authorityand Other Customers · Distribution Segment

Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-3052606000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-3052180000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-3062476000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Natural Gas Us Regulated · Residential Customers · Distribution Segment

Product Or Service · Major Customers · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-302916245000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-302583681000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-302638689000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Natural Gas Us Regulated · Distribution Segment

Product Or Service · Statement Business Segments

Source dimensions srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2024-10-01 – 2025-09-304246018000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-10-01 – 2024-09-303753132000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2022-10-01 – 2023-09-303965371000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence

Natural Gas Us Regulated · Distribution Segment · Commercial Customers

Product Or Service · Statement Business Segments · Major Customers

Source dimensions srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2023-09-301112236000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Natural Gas Us Regulated · Distribution Segment · Public Authorityand Other Customers

Product Or Service · Statement Business Segments · Major Customers

Source dimensions srt:ProductOrServiceAxis=us-gaap:NaturalGasUsRegulatedMember;us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2023-09-3062476000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Distribution Segment

Statement Business Segments

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-30773909000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-303908869000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2026-01-01 – 2026-03-311876911000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-313134960000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-311258049000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-10-01 – 2025-09-304422355000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2025-04-01 – 2025-06-30766380000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-303756691000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-01-01 – 2025-03-311881742000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-312990311000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-311108569000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2023-10-01 – 2024-09-303912134000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2024-04-01 – 2024-06-30632446000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-303325459000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-01-01 – 2024-03-311588394000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-312693013000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-311104619000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2022-10-01 – 2023-09-304096661000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-04-01 – 2023-06-30615259000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-303554389000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-01-01 – 2023-03-311499437000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-312939130000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2022-12-311439693000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Distribution Segment · Intersegment Elimination

Statement Business Segments · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-30-765000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-30-2271000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2024-01-01 – 2024-03-31787000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-311506000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2023-12-31719000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2023-04-01 – 2023-06-30-808000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-30-2314000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-01-01 – 2023-03-31773000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-311506000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2022-12-31733000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Distribution Segment · Operating Segments

Statement Business Segments · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-30633211000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-303327730000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2024-01-01 – 2024-03-311589181000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-312694519000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-04-01 – 2023-06-30616067000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-303556703000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-01-01 – 2023-03-311500210000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-312940636000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2022-12-311440426000 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Distribution Segment · Operating Segments · Gas Sales Revenue

Statement Business Segments · Consolidation Items · Product Or Service

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember
PeriodValueUnitFiledEvidence
2024-01-01 – 2024-03-311521536000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-312569286000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-01-01 – 2023-03-311409632000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-312833391000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Distribution Segment · Operating Segments · Gas Sales Revenue · Industrial Customers

Statement Business Segments · Consolidation Items · Product Or Service · Major Customers

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember
PeriodValueUnitFiledEvidence
2024-01-01 – 2024-03-3130419000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-3158650000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-01-01 – 2023-03-3145044000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-31104259000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Distribution Segment · Operating Segments · Miscellaneousrevenue

Statement Business Segments · Consolidation Items · Product Or Service

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:MiscellaneousrevenueMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-312662000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-314944000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Distribution Segment · Operating Segments · Transportationrevenue

Statement Business Segments · Consolidation Items · Product Or Service

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:TransportationrevenueMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-3133511000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-3165673000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Distribution Segment · Industrial Customers · Gas Sales Revenue · Operating Segments

Statement Business Segments · Major Customers · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-3021160000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-3079810000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-04-01 – 2023-06-3023533000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-30127792000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence

Distribution Segment · Public Authorityand Other Customers · Gassalesrevenue · Operating Segments

Statement Business Segments · Major Customers · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-3122686000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-3145512000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Distribution Segment · Residential Customers · Operating Segments · Gas Sales Revenue

Statement Business Segments · Major Customers · Consolidation Items · Product Or Service

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember
PeriodValueUnitFiledEvidence
2024-01-01 – 2024-03-311065296000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-311792978000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-01-01 – 2023-03-31943090000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-311896141000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Distribution Segment · Gassalesrevenue · Operating Segments

Statement Business Segments · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-311409632000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-312833391000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Distribution Segment · Gas Sales Revenue · Operating Segments

Statement Business Segments · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-30583802000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-303153088000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-04-01 – 2023-06-30578124000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-303411515000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence

Distribution Segment · Gassalesrevenue · Operating Segments · Commercial Customers

Statement Business Segments · Product Or Service · Consolidation Items · Major Customers

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-31398812000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-31787479000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Distribution Segment · Gassalesrevenue · Operating Segments · Industrial Customers

Statement Business Segments · Product Or Service · Consolidation Items · Major Customers

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-3145044000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-31104259000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Distribution Segment · Gassalesrevenue · Operating Segments · Residential Customers

Statement Business Segments · Product Or Service · Consolidation Items · Major Customers

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember
PeriodValueUnitFiledEvidence
2023-01-01 – 2023-03-31943090000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence
2022-10-01 – 2023-03-311896141000 USD2023-05-04 · 00:50:05.000ZOpen filing evidence

Distribution Segment · Gas Sales Revenue · Commercial Customers · Operating Segments

Statement Business Segments · Product Or Service · Major Customers · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-30169508000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-30851462000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-04-01 – 2023-06-30165930000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-30953409000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence

Distribution Segment · Gas Sales Revenue · Public Authorityand Other Customers · Operating Segments

Statement Business Segments · Product Or Service · Major Customers · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-308177000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-3043881000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-04-01 – 2023-06-308562000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-3054074000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence

Distribution Segment · Gas Sales Revenue · Residential Customers · Operating Segments

Statement Business Segments · Product Or Service · Major Customers · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-30384957000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-302177935000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-04-01 – 2023-06-30380099000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-302276240000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence

Distribution Segment · Miscellaneous Revenue · Operating Segments

Statement Business Segments · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:MiscellaneousRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-302681000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-309048000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2024-01-01 – 2024-03-313724000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-316367000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-04-01 – 2023-06-302706000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-307650000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-01-01 – 2023-03-312662000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-314944000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Distribution Segment · Natural Gas Other

Statement Business Segments · Product Or Service

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:NaturalGasOtherMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2023-09-3011919000 USD2023-11-15 · 01:29:24.000ZOpen filing evidence

Distribution Segment · Transportationrevenue · Operating Segments

Statement Business Segments · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:TransportationrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-3132162000 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Distribution Segment · Transportation Revenue · Operating Segments

Statement Business Segments · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:DistributionSegmentMember;srt:ProductOrServiceAxis=ato:TransportationRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-3030773000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-30102147000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2024-01-01 – 2024-03-3137607000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-3171374000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-04-01 – 2023-06-3027988000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-3093661000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-01-01 – 2023-03-3133511000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-3165673000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Pipelineand Storage Segment

Statement Business Segments

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember
PeriodValueUnitFiledEvidence
2026-04-01 – 2026-06-30105150000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-10-01 – 2026-06-30275177000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2026-01-01 – 2026-03-3185491000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2026-03-31170027000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2025-10-01 – 2025-12-3184536000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2024-10-01 – 2025-09-30280400000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2025-04-01 – 2025-06-3072394000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2024-10-01 – 2025-06-30208584000 USD2026-08-06 · 00:54:06.000ZOpen filing evidence
2025-01-01 – 2025-03-3168760000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2025-03-31136190000 USD2026-05-07 · 01:12:14.000ZOpen filing evidence
2024-10-01 – 2024-12-3167430000 USD2026-02-04 · 03:00:18.000ZOpen filing evidence
2023-10-01 – 2024-09-30253053000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2024-04-01 – 2024-06-3069103000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2023-10-01 – 2024-06-30181784000 USD2025-08-07 · 00:46:29.000ZOpen filing evidence
2024-01-01 – 2024-03-3158833000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2024-03-31112681000 USD2025-05-08 · 00:40:40.000ZOpen filing evidence
2023-10-01 – 2023-12-3153848000 USD2025-02-05 · 02:43:09.000ZOpen filing evidence
2022-10-01 – 2023-09-30178696000 USD2025-11-15 · 03:06:37.000ZOpen filing evidence
2023-04-01 – 2023-06-3047474000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-30133326000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-01-01 – 2023-03-3141536000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-3185852000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2022-12-3144316000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Pipelineand Storage Segment · Intersegment Elimination

Statement Business Segments · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:IntersegmentEliminationMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-30-181577000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-30-503552000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2024-01-01 – 2024-03-31164654000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-31321975000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2023-12-31157321000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence
2023-04-01 – 2023-06-30-160751000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-30-445952000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-01-01 – 2023-03-31142888000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-31285201000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2022-12-31142313000 USD2024-02-07 · 02:46:33.000ZOpen filing evidence

Pipelineand Storage Segment · Operating Segments

Statement Business Segments · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-30250680000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-30685336000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2024-01-01 – 2024-03-31223487000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-31434656000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-04-01 – 2023-06-30208225000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-30579278000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-01-01 – 2023-03-31184424000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-31371053000 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2022-12-31186629000 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Pipelineand Storage Segment · Operating Segments · Gas Sales Revenue

Statement Business Segments · Consolidation Items · Product Or Service

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember
PeriodValueUnitFiledEvidence
2024-01-01 – 2024-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-01-01 – 2023-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Pipelineand Storage Segment · Operating Segments · Gas Sales Revenue · Industrial Customers

Statement Business Segments · Consolidation Items · Product Or Service · Major Customers

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember
PeriodValueUnitFiledEvidence
2024-01-01 – 2024-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-01-01 – 2023-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Pipelineand Storage Segment · Industrial Customers · Gas Sales Revenue · Operating Segments

Statement Business Segments · Major Customers · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-04-01 – 2023-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence

Pipelineand Storage Segment · Residential Customers · Operating Segments · Gas Sales Revenue

Statement Business Segments · Major Customers · Consolidation Items · Product Or Service

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember
PeriodValueUnitFiledEvidence
2024-01-01 – 2024-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-10-01 – 2024-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2023-01-01 – 2023-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence
2022-10-01 – 2023-03-310 USD2024-05-09 · 00:46:12.000ZOpen filing evidence

Pipelineand Storage Segment · Gassalesrevenue · Operating Segments

Statement Business Segments · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-310 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Pipelineand Storage Segment · Gas Sales Revenue · Operating Segments

Statement Business Segments · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-04-01 – 2023-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence

Pipelineand Storage Segment · Gassalesrevenue · Commercial Customers · Operating Segments

Statement Business Segments · Product Or Service · Major Customers · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-310 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Pipelineand Storage Segment · Gas Sales Revenue · Commercial Customers · Operating Segments

Statement Business Segments · Product Or Service · Major Customers · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:CommercialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-04-01 – 2023-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence

Pipelineand Storage Segment · Gassalesrevenue · Industrial Customers · Operating Segments

Statement Business Segments · Product Or Service · Major Customers · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:IndustrialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-310 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Pipelineand Storage Segment · Gassalesrevenue · Public Authorityand Other Customers · Operating Segments

Statement Business Segments · Product Or Service · Major Customers · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-310 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Pipelineand Storage Segment · Gas Sales Revenue · Public Authorityand Other Customers · Operating Segments

Statement Business Segments · Product Or Service · Major Customers · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:PublicAuthorityandOtherCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-04-01 – 2023-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence

Pipelineand Storage Segment · Gassalesrevenue · Residential Customers · Operating Segments

Statement Business Segments · Product Or Service · Major Customers · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:GassalesrevenueMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-310 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Pipelineand Storage Segment · Gas Sales Revenue · Residential Customers · Operating Segments

Statement Business Segments · Product Or Service · Major Customers · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:GasSalesRevenueMember;srt:MajorCustomersAxis=ato:ResidentialCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-04-01 – 2023-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-300 USD2024-08-08 · 00:48:31.000ZOpen filing evidence

Pipelineand Storage Segment · Miscellaneous Revenue · Operating Segments

Statement Business Segments · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:MiscellaneousRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-307592000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-3012796000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-04-01 – 2023-06-304397000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-308271000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence

Pipelineand Storage Segment · Transportationrevenue · Operating Segments

Statement Business Segments · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:TransportationrevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2022-10-01 – 2022-12-31195252000 USD2023-02-08 · 02:50:36.000ZOpen filing evidence

Pipelineand Storage Segment · Transportation Revenue · Operating Segments

Statement Business Segments · Product Or Service · Consolidation Items

Source dimensions us-gaap:StatementBusinessSegmentsAxis=ato:PipelineandStorageSegmentMember;srt:ProductOrServiceAxis=ato:TransportationRevenueMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember
PeriodValueUnitFiledEvidence
2024-04-01 – 2024-06-30260779000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-10-01 – 2024-06-30699243000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2023-04-01 – 2023-06-30212322000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence
2022-10-01 – 2023-06-30597822000 USD2024-08-08 · 00:48:31.000ZOpen filing evidence