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Segment Information (Tables)
9 Months Ended
Jun. 30, 2025
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Income statements and capital expenditures for the three and nine months ended June 30, 2025 and 2024 by segment are presented in the following tables:
 Three Months Ended June 30, 2025
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$766,380 $72,394 $— $838,774 
Intersegment revenues752 199,994 (200,746)— 
Total operating revenues767,132 272,388 (200,746)838,774 
Purchased gas cost
255,883 (1,548)(200,495)53,840 
Operation and maintenance expense166,744 55,607 (251)222,100 
Depreciation and amortization expense137,106 48,680 — 185,786 
Taxes, other than income111,933 13,048 — 124,981 
Operating income95,466 156,601 — 252,067 
Other non-operating income7,017 13,083 — 20,100 
Interest charges22,271 19,266 — 41,537 
Income before income taxes
80,212 150,418 — 230,630 
Income tax expense9,731 34,470 — 44,201 
Net income$70,481 $115,948 $— $186,429 
Capital expenditures$669,452 $197,478 $— $866,930 
 Three Months Ended June 30, 2024
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$632,446 $69,103 $— $701,549 
Intersegment revenues765 181,577 (182,342)— 
Total operating revenues633,211 250,680 (182,342)701,549 
Purchased gas cost
179,510 (19)(182,084)(2,593)
Operation and maintenance expense153,140 58,427 (258)211,309 
Depreciation and amortization expense122,912 43,915 — 166,827 
Taxes, other than income94,527 11,212 — 105,739 
Operating income83,122 137,145 — 220,267 
Other non-operating income11,452 8,446 — 19,898 
Interest charges22,550 18,610 — 41,160 
Income before income taxes
72,024 126,981 — 199,005 
Income tax expense6,175 27,266 — 33,441 
Net income$65,849 $99,715 $— $165,564 
Capital expenditures$587,062 $126,549 $— $713,611 
 Nine Months Ended June 30, 2025
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$3,756,691 $208,584 $— $3,965,275 
Intersegment revenues2,304 578,193 (580,497)— 
Total operating revenues3,758,995 786,777 (580,497)3,965,275 
Purchased gas cost
1,647,490 (638)(579,731)1,067,121 
Operation and maintenance expense503,145 160,061 (766)662,440 
Depreciation and amortization expense405,279 143,790 — 549,069 
Taxes, other than income307,849 38,310 — 346,159 
Operating income895,232 445,254 — 1,340,486 
Other non-operating income30,545 38,361 — 68,906 
Interest charges86,607 57,869 — 144,476 
Income before income taxes
839,170 425,746 — 1,264,916 
Income tax expense147,833 93,220 — 241,053 
Net income$691,337 $332,526 $— $1,023,863 
Capital expenditures$1,889,954 $707,833 $— $2,597,787 
 Nine Months Ended June 30, 2024
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$3,325,459 $181,784 $— $3,507,243 
Intersegment revenues2,271 503,552 (505,823)— 
Total operating revenues3,327,730 685,336 (505,823)3,507,243 
Purchased gas cost
1,464,815 825 (505,069)960,571 
Operation and maintenance expense435,711 142,596 (754)577,553 
Depreciation and amortization expense363,981 132,541 — 496,522 
Taxes, other than income273,430 28,805 — 302,235 
Operating income789,793 380,569 — 1,170,362 
Other non-operating income26,650 27,821 — 54,471 
Interest charges93,915 54,562 — 148,477 
Income before income taxes
722,528 353,828 — 1,076,356 
Income tax expense92,550 74,927 — 167,477 
Net income$629,978 $278,901 $— $908,879 
Capital expenditures$1,659,217 $469,920 $— $2,129,137 
Balance sheet information at June 30, 2025 and September 30, 2024 by segment is presented in the following tables:
 June 30, 2025
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Net property, plant and equipment$18,010,431 $6,367,712 $— $24,378,143 
Total assets$26,806,555 $6,705,835 $(5,799,863)$27,712,527 
 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