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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, 2023
Sep. 30, 2022
Sep. 30, 2021
Numerator:      
Net income (loss) $ 434,100 $ 6,953 $ (326,150)
Adjustment for basic earnings (loss) per share:      
Earnings allocated to unvested shareholders (5,863) (1,508) (1,350)
Numerator for basic earnings (loss) per share 428,237 5,445 (327,500)
Adjustment for diluted earnings (loss) per share:      
Effect of reallocating undistributed earnings of unvested shareholders 12 0 0
Numerator for diluted earnings (loss) per share $ 428,249 $ 5,445 $ (327,500)
Denominator:      
Denominator for basic earnings (loss) per share - weighted-average shares (in shares) 102,447 105,891 107,818
Effect of dilutive shares from restricted stock and performance share units (in shares) 405 664 0
Denominator for diluted earnings (loss) per share - adjusted weighted-average shares (in shares) 102,852 106,555 107,818
Basic earnings (loss) per common share (in dollars per share) $ 4.18 $ 0.05 $ (3.04)
Diluted earnings (loss) per common share (in dollars per share) $ 4.16 $ 0.05 $ (3.04)