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Segment Information (Tables)
12 Months Ended
Sep. 30, 2024
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Income statements and capital expenditures by segment are shown in the following tables.
 Year Ended September 30, 2024
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$3,912,134 $253,053 $— $4,165,187 
Intersegment revenues3,007 684,976 (687,983)— 
Total operating revenues3,915,141 938,029 (687,983)4,165,187 
Purchased gas cost1,620,515 146 (686,968)933,693 
Operation and maintenance expense601,370 218,782 (1,015)819,137 
Depreciation and amortization expense491,982 177,990 — 669,972 
Taxes, other than income346,840 40,183 — 387,023 
Operating income854,434 500,928 — 1,355,362 
Other non-operating income30,106 40,940 — 71,046 
Interest charges117,086 73,546 — 190,632 
Income before income taxes
767,454 468,322 — 1,235,776 
Income tax expense96,041 96,840 — 192,881 
Net income$671,413 $371,482 $— $1,042,895 
Capital expenditures$2,249,280 $687,844 $— $2,937,124 
 Year Ended September 30, 2023
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$4,096,661 $178,696 $— $4,275,357 
Intersegment revenues3,029 606,478 (609,507)— 
Total operating revenues4,099,690 785,174 (609,507)4,275,357 
Purchased gas cost2,061,920 (1,220)(608,527)1,452,173 
Operation and maintenance expense565,179 200,707 (980)764,906 
Depreciation and amortization expense434,721 169,606 — 604,327 
Taxes, other than income345,244 41,560 — 386,804 
Operating income692,626 374,521 — 1,067,147 
Other non-operating income24,988 44,787 — 69,775 
Interest charges77,185 60,096 — 137,281 
Income before income taxes
640,429 359,212 — 999,641 
Income tax expense60,032 53,747 — 113,779 
Net income$580,397 $305,465 $— $885,862 
Capital expenditures$1,927,125 $878,848 $— $2,805,973 

 Year Ended September 30, 2022
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$4,031,936 $169,726 $— $4,201,662 
Intersegment revenues3,258 523,934 (527,192)— 
Total operating revenues4,035,194 693,660 (527,192)4,201,662 
Purchased gas cost2,210,302 (1,583)(526,063)1,682,656 
Operation and maintenance expense518,443 192,847 (1,129)710,161 
Depreciation and amortization expense387,858 147,797 — 535,655 
Taxes, other than income314,046 38,162 — 352,208 
Operating income604,545 316,437 — 920,982 
Other non-operating income6,946 26,791 — 33,737 
Interest charges49,921 52,890 — 102,811 
Income before income taxes
561,570 290,338 — 851,908 
Income tax expense39,593 37,917 — 77,510 
Net income$521,977 $252,421 $— $774,398 
Capital expenditures$1,675,798 $768,622 $— $2,444,420 
Balance sheet information at September 30, 2024 and 2023 by segment is presented in the following tables.
 September 30, 2024
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Property, plant and equipment, net$16,372,659 $5,831,708 $— $22,204,367 
Total assets$24,328,877 $6,181,558 $(5,315,970)$25,194,465 

 September 30, 2023
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Property, plant and equipment, net$14,402,578 $5,204,005 $— $19,606,583 
Total assets$21,716,467 $5,504,972 $(4,704,471)$22,516,968 
Schedule of Revenue from External Customers by Products and Services
The following table summarizes our revenues from external parties, excluding intersegment revenues, by products and services for the fiscal years ended September 30.
202420232022
 (In thousands)
Distribution revenues:
Gas sales revenues:
Residential$2,583,681 $2,638,689 $2,492,116 
Commercial1,016,675 1,112,236 1,126,189 
Industrial100,596 151,970 224,632 
Public authority and other52,180 62,476 66,956 
Total gas sales revenues3,753,132 3,965,371 3,909,893 
Transportation revenues132,608 119,371 110,905 
Other gas revenues26,394 11,919 11,138 
Total distribution revenues3,912,134 4,096,661 4,031,936 
Pipeline and storage revenues253,053 178,696 169,726 
Total operating revenues$4,165,187 $4,275,357 $4,201,662