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Segment Information (Tables)
3 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment Income statements and capital expenditures for the three months ended December 31, 2021 and 2020 by segment are presented in the following tables:
 Three Months Ended December 31, 2021
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$971,636 $41,150 $— $1,012,786 
Intersegment revenues786 121,768 (122,554)— 
Total operating revenues972,422 162,918 (122,554)1,012,786 
Purchased gas cost
496,799 (3,411)(122,225)371,163 
Operation and maintenance expense123,284 36,155 (329)159,110 
Depreciation and amortization expense92,797 35,059 — 127,856 
Taxes, other than income69,045 9,751 — 78,796 
Operating income190,497 85,364 — 275,861 
Other non-operating income1,916 6,786 — 8,702 
Interest charges8,548 11,303 — 19,851 
Income before income taxes
183,865 80,847 — 264,712 
Income tax expense4,294 11,209 — 15,503 
Net income$179,571 $69,638 $— $249,209 
Capital expenditures$437,382 $246,798 $— $684,180 

 Three Months Ended December 31, 2020
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Operating revenues from external parties$875,887 $38,593 $— $914,480 
Intersegment revenues763 121,120 (121,883)— 
Total operating revenues876,650 159,713 (121,883)914,480 
Purchased gas cost
411,072 (1,244)(121,568)288,260 
Operation and maintenance expense108,802 30,156 (315)138,643 
Depreciation and amortization expense82,870 32,415 — 115,285 
Taxes, other than income64,352 9,100 — 73,452 
Operating income209,554 89,286 — 298,840 
Other non-operating income835 5,237 — 6,072 
Interest charges10,712 11,298 — 22,010 
Income before income taxes
199,677 83,225 — 282,902 
Income tax expense45,985 19,239 — 65,224 
Net income$153,692 $63,986 $— $217,678 
Capital expenditures$306,016 $150,793 $— $456,809 
Balance sheet information at December 31, 2021 and September 30, 2021 by segment is presented in the following tables:
 December 31, 2021
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Property, plant and equipment, net$11,676,614 $4,050,177 $— $15,726,791 
Total assets$19,778,943 $4,309,629 $(3,542,788)$20,545,784 
 September 30, 2021
 DistributionPipeline and StorageEliminationsConsolidated
 (In thousands)
Property, plant and equipment, net$11,232,649 $3,831,321 $— $15,063,970 
Total assets$18,847,266 $4,076,844 $(3,315,448)$19,608,662