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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, 2022
Sep. 30, 2021
Sep. 30, 2020
Numerator:      
Income (loss) from continuing operations $ 6,552 $ (337,459) $ (496,392)
Income from discontinued operations 401 11,309 1,895
NET INCOME (LOSS) 6,953 (326,150) (494,497)
Adjustment for basic earnings (loss) per share      
Losses allocated to unvested shareholders (1,508) (1,350) (2,647)
Numerator for basic earnings (loss) per share:      
From continuing operations 5,044 (338,809) (499,039)
From discontinued operations 401 11,309 1,895
Net income (loss) attributable to parent, basic 5,445 (327,500) (497,144)
Numerator for diluted earnings (loss) per share:      
From continuing operations 5,044 (338,809) (499,039)
From discontinued operations 401 11,309 1,895
Net income (loss) attributable to parent, diluted $ 5,445 $ (327,500) $ (497,144)
Denominator:      
Denominator for basic earnings (loss) per share - weighted-average shares (in shares) 105,891 107,818 108,009
Effect of dilutive shares from stock options, restricted stock and performance share units (in shares) 664 0 0
Denominator for diluted earnings (loss) per share - adjusted weighted-average shares (in shares) 106,555 107,818 108,009
Basic earnings (loss) per common share:      
Income (loss) from continuing operations (in dollars per share) $ 0.05 $ (3.14) $ (4.62)
Income from discontinued operations (in dollars per share) 0 0.10 0.02
Net income (loss) (in dollars per share) 0.05 (3.04) (4.60)
Diluted earnings (loss) per common share:      
Income (loss) from continuing operations (in dollars per share) 0.05 (3.14) (4.62)
Income from discontinued operations (in dollars per share) 0 0.10 0.02
Net income (loss) (in dollars per share) $ 0.05 $ (3.04) $ (4.60)