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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)