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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Operating revenues | $ 816,429 | $ 605,553 | $ 3,479,034 | $ 2,839,106
Purchased gas cost | 249,159 | 86,870 | 1,491,700 | 948,939
Operation and maintenance expense | 182,325 | 184,470 | 504,787 | 479,488
Depreciation and amortization expense | 134,231 | 119,348 | 395,461 | 353,269
Taxes, other than income | 96,127 | 81,475 | 271,506 | 243,376
Operating income | 154,587 | 133,390 | 815,580 | 814,034
Other non-operating income | 13,263 | 5,887 | 27,178 | 14,793
Interest charges | 26,190 | 20,962 | 74,969 | 69,068
Income before income taxes | 141,660 | 118,315 | 767,789 | 759,759
Income tax expense | 13,113 | 15,904 | 65,034 | 142,916
Net income | $ 128,547 | $ 102,411 | $ 702,755 | $ 616,843
Basic net income per share (USD per share) | $ 0.92 | $ 0.78 | $ 5.13 | $ 4.77
Diluted net income per share (USD per share) | 0.92 | 0.78 | 5.12 | 4.77
Cash dividends per share (USD per share) | $ 0.68 | $ 0.625 | $ 2.04 | $ 1.875
Basic weighted average shares outstanding (in shares) | 139,881 | 131,358 | 136,799 | 129,185
Diluted weighted average shares outstanding (in shares) | 140,227 | 131,486 | 137,055 | 129,229
Other comprehensive income (loss), net of tax |  |  |  |
Net unrealized holding losses on available-for-sale securities | $ (106) | $ (36) | $ (336) | $ (165)
Cash flow hedges: |  |  |  |
Amortization and unrealized gain (loss) on interest rate agreements | 159,737 | (79,196) | 235,743 | 118,993
Total other comprehensive income (loss) | 159,631 | (79,232) | 235,407 | 118,828
Total comprehensive income | 288,178 | 23,179 | 938,162 | 735,671
Distribution segment |  |  |  |
Operating revenues | 772,497 | 557,931 | 3,353,800 | 2,715,644
Pipeline and storage segment |  |  |  |
Operating revenues | 43,932 | 47,622 | 125,234 | 123,462
Purchased gas cost |  |  |  |
Purchased gas cost | 249,159 | 86,870 | 1,491,700 | 948,939
Operating Segments | Distribution segment |  |  |  |
Operating revenues | 773,311 | 558,750 | 3,356,279 | 2,718,074
Purchased gas cost | 390,559 | 202,050 | 1,881,212 | 1,304,269
Operation and maintenance expense | 133,654 | 130,454 | 378,479 | 363,246
Depreciation and amortization expense | 97,106 | 86,099 | 286,515 | 254,636
Taxes, other than income | 85,933 | 72,024 | 242,214 | 214,991
Operating income | 66,059 | 68,123 | 567,859 | 580,932
Other non-operating income | 6,708 | 1,060 | 9,173 | 1,135
Interest charges | 12,341 | 8,540 | 36,046 | 33,269
Income before income taxes | 60,426 | 60,643 | 540,986 | 548,798
Income tax expense | 3,025 | 7,354 | 35,163 | 109,481
Net income | 57,401 | 53,289 | 505,823 | 439,317
Operating Segments | Pipeline and storage segment |  |  |  |
Operating revenues | 183,412 | 162,987 | 510,077 | 476,868
Purchased gas cost | (1,347) | 691 | (3,075) | (440)
Operation and maintenance expense | 48,912 | 54,329 | 127,193 | 117,188
Depreciation and amortization expense | 37,125 | 33,249 | 108,946 | 98,633
Taxes, other than income | 10,194 | 9,451 | 29,292 | 28,385
Operating income | 88,528 | 65,267 | 247,721 | 233,102
Other non-operating income | 6,555 | 4,827 | 18,005 | 13,658
Interest charges | 13,849 | 12,422 | 38,923 | 35,799
Income before income taxes | 81,234 | 57,672 | 226,803 | 210,961
Income tax expense | 10,088 | 8,550 | 29,871 | 33,435
Net income | 71,146 | 49,122 | 196,932 | 177,526
Operating Segments | Purchased gas cost | Distribution segment |  |  |  |
Purchased gas cost | 390,559 | 202,050 | 1,881,212 | 1,304,269
Operating Segments | Purchased gas cost | Pipeline and storage segment |  |  |  |
Purchased gas cost | (1,347) | 691 | (3,075) | (440)
Eliminations |  |  |  |
Operating revenues | (140,294) | (116,184) | (387,322) | (355,836)
Purchased gas cost | (140,053) | (115,871) | (386,437) | (354,890)
Operation and maintenance expense | (241) | (313) | (885) | (946)
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
Eliminations | Distribution segment |  |  |  |
Operating revenues | 814 | 819 | 2,479 | 2,430
Eliminations | Pipeline and storage segment |  |  |  |
Operating revenues | 139,480 | 115,365 | 384,843 | 353,406
Eliminations | Purchased gas cost |  |  |  |
Purchased gas cost | $ (140,053) | $ (115,871) | $ (386,437) | $ (354,890)

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