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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, 2025
Sep. 30, 2024
Sep. 30, 2023
Numerator:      
Net income (loss) $ (163,695) $ 344,165 $ 434,100
Adjustment for basic (loss) earnings per share:      
Earnings allocated to unvested shareholders (1,399) (4,726) (5,863)
Numerator for basic earnings (loss) per share (165,094) 339,439 428,237
Adjustment for diluted earnings (loss) per share:      
Effect of reallocating undistributed earnings of unvested shareholders 0 5 12
Numerator for diluted earnings (loss) per share $ (165,094) $ 339,444 $ 428,249
Denominator:      
Denominator for basic earnings (loss) per share - weighted-average shares (in shares) 99,272 98,857 102,447
Effect of dilutive shares from restricted stock and performance share units (in shares) 0 210 405
Denominator for diluted earnings (loss) per share - adjusted weighted-average shares (in shares) 99,272 99,067 102,852
Basic earnings per common share (in dollars per share) $ (1.66) $ 3.43 $ 4.18
Diluted earnings per common share (in dollars per share) $ (1.66) $ 3.43 $ 4.16