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Segment Information (Table)
9 Months Ended
Jun. 30, 2021
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Income statements and capital expenditures for the three and nine months ended June 30, 2021 and 2020 by segment are presented in the following tables:
 Three Months Ended June 30, 2021
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$557,931 $47,622 $— $605,553 
Intersegment revenues819 115,365 (116,184)— 
Total operating revenues558,750 162,987 (116,184)605,553 
Purchased gas cost
202,050 691 (115,871)86,870 
Operation and maintenance expense130,454 54,329 (313)184,470 
Depreciation and amortization expense86,099 33,249 — 119,348 
Taxes, other than income72,024 9,451 — 81,475 
Operating income68,123 65,267 — 133,390 
Other non-operating income1,060 4,827 — 5,887 
Interest charges8,540 12,422 — 20,962 
Income before income taxes
60,643 57,672 — 118,315 
Income tax expense7,354 8,550 — 15,904 
Net income$53,289 $49,122 $— $102,411 
Capital expenditures$398,416 $113,816 $— $512,232 
 Three Months Ended June 30, 2020
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$434,650 $58,345 $— $492,995 
Intersegment revenues658 99,663 (100,321)— 
Total operating revenues435,308 158,008 (100,321)492,995 
Purchased gas cost
126,093 (11)(100,010)26,072 
Operation and maintenance expense107,537 42,234 (311)149,460 
Depreciation and amortization expense77,187 29,917 — 107,104 
Taxes, other than income61,980 9,344 — 71,324 
Operating income62,511 76,524 — 139,035 
Other non-operating income5,167 2,068 — 7,235 
Interest charges7,969 11,611 — 19,580 
Income before income taxes
59,709 66,981 — 126,690 
Income tax expense810 8,089 — 8,899 
Net income$58,899 $58,892 $— $117,791 
Capital expenditures$342,385 $68,551 $— $410,936 
 Nine Months Ended June 30, 2021
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$2,715,644 $123,462 $— $2,839,106 
Intersegment revenues2,430 353,406 (355,836)— 
Total operating revenues2,718,074 476,868 (355,836)2,839,106 
Purchased gas cost
1,304,269 (440)(354,890)948,939 
Operation and maintenance expense363,246 117,188 (946)479,488 
Depreciation and amortization expense254,636 98,633 — 353,269 
Taxes, other than income214,991 28,385 — 243,376 
Operating income580,932 233,102 — 814,034 
Other non-operating income1,135 13,658 — 14,793 
Interest charges33,269 35,799 — 69,068 
Income before income taxes
548,798 210,961 — 759,759 
Income tax expense109,481 33,435 — 142,916 
Net income$439,317 $177,526 $— $616,843 
Capital expenditures$1,000,616 $357,344 $— $1,357,960 
 Nine Months Ended June 30, 2020
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$2,194,786 $151,437 $— $2,346,223 
Intersegment revenues2,031 300,984 (303,015)— 
Total operating revenues2,196,817 452,421 (303,015)2,346,223 
Purchased gas cost
942,586 290 (302,053)640,823 
Operation and maintenance expense337,740 112,751 (962)449,529 
Depreciation and amortization expense229,526 88,556 — 318,082 
Taxes, other than income190,636 23,899 — 214,535 
Operating income496,329 226,925 — 723,254 
Other non-operating income1,930 7,203 — 9,133 
Interest charges35,128 33,852 — 68,980 
Income before income taxes
463,131 200,276 — 663,407 
Income tax expense87,411 39,886 — 127,297 
Net income$375,720 $160,390 $— $536,110 
Capital expenditures$1,119,945 $285,728 $— $1,405,673 

Balance sheet information at June 30, 2021 and September 30, 2020 by segment is presented in the following tables:
 June 30, 2021
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Property, plant and equipment, net$10,802,062 $3,675,687 $— $14,477,749 
Total assets$18,563,345 $3,906,816 $(3,154,726)$19,315,435 
 September 30, 2020
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Property, plant and equipment, net$9,944,978 $3,410,369 $— $13,355,347 
Total assets$14,578,176 $3,647,907 $(2,867,051)$15,359,032