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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 696,825 | $ 648,872 | $ 577,484 | $ 564,087 | $ 532,304 | $ 498,564 | $ 405,283 | $ 368,590 | $ 2,487,268 | $ 1,804,741 | $ 1,624,232
Operating income (loss) | 23,118 | 6,217 | (1,253) | 3,520 | (29,677) | (28,028) | (65,672) | (49,164) | 31,602 | (172,541) | (25,966)
Income (loss) from continuing operations | 2,175 | (8,174) | (1,633) | 500,642 | (21,711) | (23,125) | (48,473) | (34,554) | 493,010 | (127,863) | (52,990)
Net income (loss) | $ 2,453 | $ (8,008) | $ (11,879) | $ 500,106 | $ (22,532) | $ (21,799) | $ (48,818) | $ (35,063) | $ 482,672 | $ (128,212) | $ (56,828)
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share) | $ 0.02 | $ (0.08) | $ (0.03) | $ 4.57 | $ (0.20) | $ (0.22) | $ (0.45) | $ (0.33) | $ 4.49 | $ (1.20) | $ (0.50)
Net income (loss) (in dollars per share) | 0.02 | (0.08) | (0.12) | 4.57 | (0.21) | (0.21) | (0.45) | (0.33) | 4.39 | (1.20) | (0.54)
Diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share) | 0.02 | (0.08) | (0.03) | 4.55 | (0.20) | (0.22) | (0.45) | (0.33) | 4.47 | (1.20) | (0.50)
Net income (in dollars per share) | $ 0.02 | $ (0.08) | $ (0.12) | $ 4.55 | $ (0.21) | $ (0.21) | $ (0.45) | $ (0.33) | $ 4.37 | $ (1.20) | $ (0.54)
Income tax expense (benefit) related to new tax act |  |  |  | $ 502,100 |  |  |  |  | $ 502,100 |  |
Diluted earnings per share related to Tax Cuts and Jobs Act of 2017 (in dollars per share) |  |  |  | $ 4.59 |  |  |  |  |  |  |
Gain (loss) from the sale of assets, net | $ 5,500 | $ 3,100 | $ 3,800 | $ 4,200 | $ 2,300 | $ 1,300 | $ 10,100 | $ 600 |  |  |
Gain (loss) from the sale of assets, per diluted share (in dollars per share) | $ 0.05 | $ 0.02 | $ 0.04 | $ 0.04 | $ 0.02 | $ 0.01 | $ 0.09 | $ 0.01 |  |  |
Asset impairment, net of tax | $ 17,200 |  |  |  |  |  |  |  |  |  |
Asset impairment charge, net of tax per diluted share (in dollars per share) | $ 0.16 |  |  |  |  |  |  |  |  |  |

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