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Segment Information
 3 Months Ended
Dec. 31, 2025
Segment Reporting [Abstract]  
Segment Information Segment Information
We manage and review our consolidated operations through the following reportable segments:

•The distribution segment is comprised of our regulated natural gas distribution and related sales operations in eight states.
•The pipeline and storage segment is comprised primarily of the regulated pipeline and storage operations of our Atmos Pipeline-Texas division and our natural gas transmission operations in Louisiana.
The accounting policies of the segments are the same as those described in the summary of significant accounting policies found in our Annual Report on Form 10-K for the fiscal year ended September 30, 2025.
Income statement information and capital expenditures for the three months ended December 31, 2025 and 2024 by segment are presented in the following tables:
 Three Months Ended December 31, 2025
 DistributionPipeline and StorageTotal of Reportable Segments
 (In thousands)
Operating revenues from external parties$1,258,049 $84,536 $1,342,585 
Intersegment revenues777 202,097 202,874 
Total operating revenues1,258,826 286,633 1,545,459 
Operation and maintenance expense165,368 58,592 223,960 
Depreciation and amortization expense (2)
145,988 48,657 194,645 
Interest charges (2)
24,445 8,968 33,413 
Income tax expense (2)
61,142 39,476 100,618 
Other segment items (1)
592,648 (2,789)589,859 
Net income (2)
$269,235 $133,729 $402,964 
Capital expenditures (2)
$804,575 $228,772 $1,033,347 
Reconciliation to consolidated total operating revenues:
Total operating revenues of reportable segments$1,545,459 
Elimination of intersegment revenues(202,874)
Consolidated total operating revenues$1,342,585 

 Three Months Ended December 31, 2024
 DistributionPipeline and StorageTotal of Reportable Segments
 (In thousands)
Operating revenues from external parties$1,108,569 $67,430 $1,175,999 
Intersegment revenues766 187,960 188,726 
Total operating revenues1,109,335 255,390 1,364,725 
Operation and maintenance expense145,896 52,734 198,630 
Depreciation and amortization expense (2)
133,627 46,906 180,533 
Interest charges (2)
34,249 18,676 52,925 
Income tax expense (2)
51,670 27,661 79,331 
Other segment items (1)
503,680 (2,232)501,448 
Net income (2)
$240,213 $111,645 $351,858 
Capital expenditures (2)
$625,649 $265,542 $891,191 
Reconciliation to consolidated total operating revenues:
Total operating revenues of reportable segments$1,364,725 
Elimination of intersegment revenues(188,726)
Consolidated total operating revenues$1,175,999 
(1)Other segment items consist of purchased gas cost, bad debt expense, taxes other than income taxes, the equity component of AFUDC, community support spending, and other segment income or expense deemed insignificant which are used to reach net income, our measurement of segment profit or loss.
(2)The totals of reportable segments for these items reconcile to consolidated totals.
Balance sheet information at December 31, 2025 and September 30, 2025 by segment is presented in the following tables:
 December 31, 2025
 DistributionPipeline and StorageTotal of Reportable Segments
 (In thousands)
Net property, plant and equipment (1)
$19,503,317 $6,764,554 $26,267,871 
Total assets$28,804,007 $7,152,658 $35,956,665 
Reconciliation to consolidated assets:
Total assets of reportable segments$35,956,665 
Elimination of intersegment assets(6,158,270)
Consolidated total assets$29,798,395 
 September 30, 2025
 DistributionPipeline and StorageTotal of Reportable Segments
 (In thousands)
Net property, plant and equipment (1)
$18,765,128 $6,527,862 $25,292,990 
Total assets$27,296,805 $6,896,646 $34,193,451 
Reconciliation to consolidated assets:
Total assets of reportable segments$34,193,451 
Elimination of intersegment assets(5,943,929)
Consolidated total assets$28,249,522 
(1)The total of reportable segments for this item reconciles to consolidated total.