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Debt - Senior Notes Due 2032 (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Debt Instrument [Line Items]        
Proceeds from borrowings   $ 300,000 $ 0 $ 230,000
2032 Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Principal amount $ 300,000 $ 300,000    
Stated interest rate 7.375%      
Proceeds from borrowings $ 292,400      
Unamortized debt issuance expense $ 7,600      
Effective interest rate   7.85%    
2032 Senior Notes | Senior Notes | Debt Conversion, Condition One | Debt Instrument, Redemption, Period One        
Debt Instrument [Line Items]        
Repurchase price, percent of principal amount   100.00%    
2032 Senior Notes | Senior Notes | Debt Conversion, Condition One | Debt Instrument, Redemption, Period One | Maximum        
Debt Instrument [Line Items]        
Repurchase price, percent of principal amount   40.00%