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EARNINGS (LOSSES) PER COMMON SHARE - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Numerator: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ 41,890 | $ (154,621) | $ 71,857 | $ 8,364 | $ 2,175 | $ (8,174) | $ (1,633) | $ 500,642 | $ (32,510) | $ 493,010 | $ (127,863)
Loss from discontinued operations |  |  |  |  |  |  |  |  | (1,146) | (10,338) | (349)
Net income (loss) | $ 41,177 | $ (154,683) | $ 60,891 | $ 18,959 | $ 2,453 | $ (8,008) | $ (11,879) | $ 500,106 | (33,656) | 482,672 | (128,212)
Adjustment for basic earnings per share |  |  |  |  |  |  |  |  |  |  |
Earnings allocated to unvested shareholders |  |  |  |  |  |  |  |  | (3,102) | (4,346) | (1,811)
Numerator for basic earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |
From continuing operations |  |  |  |  |  |  |  |  | (35,612) | 488,664 | (129,674)
From discontinued operations |  |  |  |  |  |  |  |  | (1,146) | (10,338) | (349)
Net income (loss) attributable to parent, basic |  |  |  |  |  |  |  |  | (36,758) | 478,326 | (130,023)
Adjustment for diluted earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Effect of reallocating undistributed earnings of unvested shareholders |  |  |  |  |  |  |  |  | 0 | 7 | 0
Numerator for diluted earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |
From continuing operations |  |  |  |  |  |  |  |  | (35,612) | 488,671 | (129,674)
From discontinued operations |  |  |  |  |  |  |  |  | (1,146) | (10,338) | (349)
Net income (loss) attributable to parent, diluted |  |  |  |  |  |  |  |  | $ (36,758) | $ 478,340 | $ (130,023)
Denominator: |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings (loss) per share - weighted-average shares (in shares) |  |  |  |  |  |  |  |  | 109,216 | 108,851 | 108,500
Effect of dilutive shares from stock options, restricted stock and performance share units (in shares) |  |  |  |  |  |  |  |  | 0 | 536 | 0
Denominator for diluted earnings (loss) per share - adjusted weighted-average shares (in shares) |  |  |  |  |  |  |  |  | 109,216 | 109,387 | 108,500
Basic earnings (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share) | $ 0.38 | $ (1.42) | $ 0.65 | $ 0.07 | $ 0.02 | $ (0.08) | $ (0.03) | $ 4.57 | $ (0.33) | $ 4.49 | $ (1.20)
Loss from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | (0.01) | (0.10) | 0
Net income (loss) (in dollars per share) | 0.37 | (1.42) | 0.55 | 0.17 | 0.02 | (0.08) | (0.12) | 4.57 | (0.34) | 4.39 | (1.20)
Diluted earnings (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (in dollars per share) | 0.38 | (1.42) | 0.65 | 0.07 | 0.02 | (0.08) | (0.03) | 4.55 | (0.33) | 4.47 | (1.20)
Loss from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | (0.01) | (0.10) | 0
Net income (loss) (in dollars per share) | $ 0.37 | $ (1.42) | $ 0.55 | $ 0.17 | $ 0.02 | $ (0.08) | $ (0.12) | $ 4.55 | $ (0.34) | $ 4.37 | $ (1.20)

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