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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Basic earnings per common share:    
Net income - basic $ 44,304 $ 31,016
Weighted shares outstanding - basic (in shares) 61,243 54,827
Basic earnings per common share (in dollars per share) $ 0.72 $ 0.57
Diluted earnings per common share:    
Net income - basic $ 44,304 $ 31,016
Add: Convertible Notes interest expense, net of tax 1,878 2,439
Net income - diluted $ 46,182 $ 33,455
Weighted shares outstanding - basic (in shares) 61,243 54,827
Equity-based compensation awards - effect of dilution (in shares) 1,562 1,541
Convertible Notes - effect of dilution (in shares) 20,477 26,979
Weighted shares outstanding - diluted (in shares) 83,282 83,347
Diluted earnings per common share (in dollars per share) $ 0.55 $ 0.40
3.750% Convertible Senior Notes, Due 2029 | Senior Notes    
Diluted earnings per common share:    
Stated interest rate 3.75%  
2.375% Convertible Senior Notes, Due 2025 | Senior Notes    
Diluted earnings per common share:    
Stated interest rate   2.375%
Weighted average shares (in shares)   6,500
Restricted stock    
Diluted earnings per common share:    
Potential common shares excluded from the calculation of diluted earnings per common share (in shares) 1,151 1,437