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Segment Information (Tables)
3 Months Ended
Dec. 31, 2024
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Income statements and capital expenditures for the three months ended December 31, 2024 and 2023 by segment are presented in the following tables:
 Three Months Ended December 31, 2024
 DistributionPipeline and StorageEliminationsConsolidated
 (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 (188,726)1,175,999 
Purchased gas cost
422,570 (58)(188,464)234,048 
Operation and maintenance expense154,514 52,792 (262)207,044 
Depreciation and amortization expense133,627 46,906 — 180,533 
Taxes, other than income82,576 12,318 — 94,894 
Operating income316,048 143,432 — 459,480 
Other non-operating income10,084 14,550 — 24,634 
Interest charges34,249 18,676 — 52,925 
Income before income taxes
291,883 139,306 — 431,189 
Income tax expense51,670 27,661 — 79,331 
Net income$240,213 $111,645 $— $351,858 
Capital expenditures$625,649 $265,542 $— $891,191 
 Three Months Ended December 31, 2023
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$1,104,619 $53,848 $— $1,158,467 
Intersegment revenues719 157,321 (158,040)— 
Total operating revenues1,105,338 211,169 (158,040)1,158,467 
Purchased gas cost
496,662 (157,797)338,869 
Operation and maintenance expense127,615 38,973 (243)166,345 
Depreciation and amortization expense119,685 44,923 — 164,608 
Taxes, other than income80,895 8,645 — 89,540 
Operating income280,481 118,624 — 399,105 
Other non-operating income5,839 12,047 — 17,886 
Interest charges34,581 17,294 — 51,875 
Income before income taxes
251,739 113,377 — 365,116 
Income tax expense30,302 23,522 — 53,824 
Net income$221,437 $89,855 $— $311,292 
Capital expenditures$539,158 $230,492 $— $769,650 

Balance sheet information at December 31, 2024 and September 30, 2024 by segment is presented in the following tables:
 December 31, 2024
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Net property, plant and equipment$16,942,174 $6,019,869 $— $22,962,043 
Total assets$25,623,410 $6,341,439 $(5,467,756)$26,497,093 
 September 30, 2024
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Net property, plant and equipment$16,372,659 $5,831,708 $— $22,204,367 
Total assets$24,328,877 $6,181,558 $(5,315,970)$25,194,465