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EARNINGS (LOSS) PER COMMON SHARE - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Numerator:      
Loss from continuing operations $ (337,459) $ (496,392) $ (32,510)
Income (loss) from discontinued operations 11,309 1,895 (1,146)
NET LOSS (326,150) (494,497) (33,656)
Adjustment for basic earnings (loss) per share      
Losses allocated to unvested shareholders (1,350) (2,647) (3,102)
Numerator for basic earnings (loss) per share:      
From continuing operations (338,809) (499,039) (35,612)
From discontinued operations 11,309 1,895 (1,146)
Net income (loss) attributable to parent, basic (327,500) (497,144) (36,758)
Numerator for diluted earnings (loss) per share:      
From continuing operations (338,809) (499,039) (35,612)
From discontinued operations 11,309 1,895 (1,146)
Net income (loss) attributable to parent, diluted $ (327,500) $ (497,144) $ (36,758)
Denominator:      
Denominator for basic earnings (loss) per share - weighted-average shares (in shares) 107,818 108,009 109,216
Effect of dilutive shares from stock options, restricted stock and performance share units (in shares) 0 0 0
Denominator for diluted earnings (loss) per share - adjusted weighted-average shares (in shares) 107,818 108,009 109,216
Basic earnings (loss) per common share:      
Loss from continuing operations (in dollars per share) $ (3.14) $ (4.62) $ (0.33)
Income (loss) from discontinued operations (in dollars per share) 0.10 0.02 (0.01)
Net loss (in dollars per share) (3.04) (4.60) (0.34)
Diluted earnings (loss) per common share:      
Loss from continuing operations (in dollars per share) (3.14) (4.62) (0.33)
Income (loss) from discontinued operations (in dollars per share) 0.10 0.02 (0.01)
Net loss (in dollars per share) $ (3.04) $ (4.60) $ (0.34)