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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Operating revenues $ 1,647,227 $ 1,540,973 $ 2,805,694 $ 3,024,982 CloseClose
Purchased gas cost 624,295 666,211 963,164 1,404,460 CloseClose
Operation and maintenance expense 199,899 194,716 366,244 379,732 CloseClose
Depreciation and amortization expense 165,087 148,317 329,695 294,337 CloseClose
Taxes, other than income 106,956 109,091 196,496 202,629 CloseCloseCloseClose
Total Operating Expenses 1096237.0 1118335.0 1855599.0 2281158.0 0.0 Close
Total Operating Expenses 1096237.0 1118335.0 1855599.0 2281158.0 0 Close Close
Operating income 550,990 422,638 950,095 743,824 CloseCloseCloseCloseCloseClose
Total Other Income Expenses 567677.0 440044.0 984668.0 782421.0 0.0 Close
Total Other Income Expenses -1118667.0 -862682.0 -1934763.0 -1526245.0 0.0 Close CloseClose
Total Other Income Expenses -1669657.0 -1285320.0 -2884858.0 -2270069.0 0.0 Close CloseClose
Total Other Income Expenses 1118667.0 862682.0 1934763.0 1526245.0 0.0 Close CloseClose
Total Other Income Expenses 567677.0 440044.0 984668.0 782421.0 0.0 Close CloseClose
Other non-operating income 16,687 17,406 34,573 38,597 CloseCloseClose
Total Other Income Expenses 72129.0 54776.0 141890.0 112727.0 0 Close Close
Interest charges 55,442 37,370 107,317 74,130 CloseCloseClose
Income before income taxes 512,235 402,674 877,351 708,291 CloseClose
Income tax expense 80,212 45,003 134,036 78,760 Close
Net income $ 432,023 $ 357,671 $ 743,315 $ 629,531 Close
Basic net income per share (USD per share) $ 2.85 $ 2.48 $ 4.93 $ 4.40
Diluted net income per share (USD per share) 2.85 2.48 4.93 4.40
Cash dividends per share (USD per share) $ 0.805 $ 0.740 $ 1.61 $ 1.48
Basic weighted average shares outstanding (in shares) 151,271 143,941 150,534 142,881
Diluted weighted average shares outstanding (in shares) 151,297 143,987 150,547 142,963
Other comprehensive income (loss), net of tax        
Net unrealized holding gains (losses) on available-for-sale securities, net of tax $ (50) $ 134 $ 246 $ 221
Cash flow hedges:        
Amortization and unrealized gains (losses) on interest rate agreements, net of tax 27,158 (30,467) (23,074) (8,336)
Total other comprehensive income (loss) 27,108 (30,333) (22,828) (8,115)
Total comprehensive income 459,131 327,338 720,487 621,416
Distribution segment        
Operating revenues 1,588,394 1,499,437 2,693,013 2,939,130
Pipeline and storage segment        
Operating revenues 58,833 41,536 112,681 85,852
Operating Segments | Distribution segment        
Operating revenues 1,589,181 1,500,210 2,694,519 2,940,636
Purchased gas cost 788,643 809,023 1,285,305 1,690,938
Operation and maintenance expense 154,956 151,353 282,571 287,822
Depreciation and amortization expense 121,384 106,310 241,069 211,974
Taxes, other than income 98,008 98,200 178,903 182,822
Operating income 426,190 335,324 706,671 567,080
Other non-operating income 9,359 7,465 15,198 14,239
Interest charges 36,784 21,420 71,365 44,259
Income before income taxes 398,765 321,369 650,504 537,060
Income tax expense 56,073 32,895 86,375 54,118
Net income 342,692 288,474 564,129 482,942
Operating Segments | Pipeline and storage segment        
Operating revenues 223,487 184,424 434,656 371,053
Purchased gas cost 840 621 844 (237)
Operation and maintenance expense 45,196 43,591 84,169 92,376
Depreciation and amortization expense 43,703 42,007 88,626 82,363
Taxes, other than income 8,948 10,891 17,593 19,807
Operating income 124,800 87,314 243,424 176,744
Other non-operating income 7,328 9,941 19,375 24,358
Interest charges 18,658 15,950 35,952 29,871
Income before income taxes 113,470 81,305 226,847 171,231
Income tax expense 24,139 12,108 47,661 24,642
Net income 89,331 69,197 179,186 146,589
Intersegment eliminations        
Operating revenues (165,441) (143,661) (323,481) (286,707)
Purchased gas cost (165,188) (143,433) (322,985) (286,241)
Operation and maintenance expense (253) (228) (496) (466)
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 0 0 0 0
Interest charges 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
Intersegment eliminations | Distribution segment        
Operating revenues 787 773 1,506 1,506
Intersegment eliminations | Pipeline and storage segment        
Operating revenues $ 164,654 $ 142,888 $ 321,975 $ 285,201