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EARNINGS 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, 2024
Sep. 30, 2023
Sep. 30, 2022
Numerator:      
Net income $ 344,165 $ 434,100 $ 6,953
Adjustment for basic earnings per share:      
Earnings allocated to unvested shareholders (4,726) (5,863) (1,508)
Numerator for basic earnings per share 339,439 428,237 5,445
Adjustment for diluted earnings per share:      
Effect of reallocating undistributed earnings of unvested shareholders 5 12 0
Numerator for diluted earnings per share $ 339,444 $ 428,249 $ 5,445
Denominator:      
Denominator for basic earnings per share - weighted-average shares (in shares) 98,857 102,447 105,891
Effect of dilutive shares from restricted stock and performance share units (in shares) 210 405 664
Denominator for diluted earnings per share - adjusted weighted-average shares (in shares) 99,067 102,852 106,555
Basic earnings per common share (in dollars per share) $ 3.43 $ 4.18 $ 0.05
Diluted earnings per common share (in dollars per share) $ 3.43 $ 4.16 $ 0.05