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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Operating revenues $ 1,319,073 $ 977,665 $ 2,233,553 $ 1,853,228
Purchased gas cost 573,809 317,883 862,069 614,751
Operation and maintenance expense 156,375 147,824 295,018 300,069
Depreciation and amortization expense 118,636 105,916 233,921 210,978
Taxes, other than income 88,449 74,604 161,901 143,211
Operating income 381,804 331,438 680,644 584,219
Other non-operating income (expense) 2,834 (2,989) 8,906 1,898
Interest charges 26,096 22,171 48,106 49,400
Income before income taxes 358,542 306,278 641,444 536,717
Income tax expense 61,788 66,632 127,012 118,398
Net income $ 296,754 $ 239,646 $ 514,432 $ 418,319
Basic net income per share (USD per share) $ 2.30 $ 1.95 $ 4.01 $ 3.43
Diluted net income per share (USD per share) 2.30 1.95 4.01 3.42
Cash dividends per share (USD per share) $ 0.625 $ 0.575 $ 1.25 $ 1.15
Basic weighted average shares outstanding (in shares) 129,161 122,916 128,098 122,015
Diluted weighted average shares outstanding (in shares) 129,164 122,997 128,100 122,179
Other comprehensive income (loss), net of tax        
Net unrealized holding gains on available-for-sale securities, net of tax $ (66) $ (163) $ (129) $ (164)
Cash flow hedges:        
Amortization and unrealized loss on interest rate agreements, net of tax 138,005 1,053 198,189 2,106
Total other comprehensive income (loss) 137,939 890 198,060 1,942
Total comprehensive income 434,693 240,536 712,492 420,261
Distribution segment        
Operating revenues 1,281,826 932,296 2,157,713 1,760,136
Pipeline and storage segment        
Operating revenues 37,247 45,369 75,840 93,092
Operating Segments | Distribution segment        
Operating revenues 1,282,674 933,005 2,159,324 1,761,509
Purchased gas cost 691,147 418,935 1,102,219 816,493
Operation and maintenance expense 123,990 115,851 232,792 230,203
Depreciation and amortization expense 85,667 76,265 168,537 152,339
Taxes, other than income 78,615 68,413 142,967 128,656
Operating income 303,255 253,541 512,809 433,818
Other non-operating income (expense) (760) (5,191) 75 (3,237)
Income before income taxes 288,478 237,553 488,155 403,422
Income tax expense 56,142 50,489 102,127 86,601
Net income 232,336 187,064 386,028 316,821
Operating Segments | Pipeline and storage segment        
Operating revenues 154,168 146,237 313,881 294,413
Purchased gas cost 113 202 (1,131) 301
Operation and maintenance expense 32,703 32,296 62,859 70,517
Depreciation and amortization expense 32,969 29,651 65,384 58,639
Taxes, other than income 9,834 6,191 18,934 14,555
Operating income 78,549 77,897 167,835 150,401
Other non-operating income (expense) 3,594 2,202 8,831 5,135
Income before income taxes 70,064 68,725 153,289 133,295
Income tax expense 5,646 16,143 24,885 31,797
Net income 64,418 52,582 128,404 101,498
Eliminations        
Operating revenues (117,769) (101,577) (239,652) (202,694)
Purchased gas cost (117,451) (101,254) (239,019) (202,043)
Operation and maintenance expense (318) (323) (633) (651)
Depreciation and amortization expense 0 0 0 0
Taxes, other than income 0 0 0 0
Operating income 0 0 0 0
Other non-operating income (expense) 0 0 0 0
Income before income taxes 0 0 0 0
Income tax expense 0 0 0 0
Net income 0 0 0 0
Eliminations | Distribution segment        
Operating revenues 848 709 1,611 1,373
Eliminations | Pipeline and storage segment        
Operating revenues 116,921 100,868 238,041 201,321
Purchased gas cost        
Purchased gas cost 573,809 317,883 862,069 614,751
Purchased gas cost | Operating Segments | Distribution segment        
Purchased gas cost 691,147 418,935 1,102,219 816,493
Purchased gas cost | Operating Segments | Pipeline and storage segment        
Purchased gas cost 113 202 (1,131) 301
Purchased gas cost | Eliminations        
Purchased gas cost $ (117,451) $ (101,254) $ (239,019) $ (202,043)