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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, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Numerator:                      
Income (loss) from continuing operations $ (60,646) $ (46,007) $ (420,468) $ 30,729 $ 41,890 $ (154,621) $ 71,857 $ 8,364 $ (496,392) $ (32,510) $ 493,010
Income (loss) from discontinued operations                 1,895 (1,146) (10,338)
Net income (loss) $ (58,963) $ (45,599) $ (420,540) $ 30,605 $ 41,177 $ (154,683) $ 60,891 $ 18,959 (494,497) (33,656) 482,672
Adjustment for basic earnings per share                      
Earnings allocated to unvested shareholders                 (2,647) (3,102) (4,346)
Numerator for basic earnings (loss) per share:                      
From continuing operations                 (499,039) (35,612) 488,664
From discontinued operations                 1,895 (1,146) (10,338)
Net income (loss) attributable to parent, basic                 (497,144) (36,758) 478,326
Adjustment for diluted earnings (loss) per share:                      
Effect of reallocating undistributed earnings of unvested shareholders                 0 0 7
Numerator for diluted earnings (loss) per share:                      
From continuing operations                 (499,039) (35,612) 488,671
From discontinued operations                 1,895 (1,146) (10,338)
Net income (loss) attributable to parent, diluted                 $ (497,144) $ (36,758) $ 478,340
Denominator:                      
Denominator for basic earnings (loss) per share - weighted-average shares (in shares)                 108,009 109,216 108,851
Effect of dilutive shares from stock options, restricted stock and performance share units (in shares)                 0 0 536
Denominator for diluted earnings (loss) per share - adjusted weighted-average shares (in shares)                 108,009 109,216 109,387
Basic earnings (loss) per common share:                      
Income (loss) from continuing operations (in dollars per share) $ (0.57) $ (0.43) $ (3.88) $ 0.27 $ 0.38 $ (1.42) $ 0.65 $ 0.07 $ (4.62) $ (0.33) $ 4.49
Income (loss) from discontinued operations (in dollars per share)                 0.02 (0.01) (0.10)
Net income (loss) (in dollars per share) (0.55) (0.43) (3.88) 0.27 0.37 (1.42) 0.55 0.17 (4.60) (0.34) 4.39
Diluted earnings (loss) per common share:                      
Income (loss) from continuing operations (in dollars per share) (0.57) (0.43) (3.88) 0.27 0.38 (1.42) 0.65 0.07 (4.62) (0.33) 4.47
Income (loss) from discontinued operations (in dollars per share)                 0.02 (0.01) (0.10)
Net income (loss) (in dollars per share) $ (0.55) $ (0.43) $ (3.88) $ 0.27 $ 0.37 $ (1.42) $ 0.55 $ 0.17 $ (4.60) $ (0.34) $ 4.37