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Debt - Convertible Senior Notes Due 2032 (Details) - USD ($)
1 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2025
Mar. 31, 2024
Debt Instrument [Line Items]      
Proceeds from issuance of debt   $ 300,000,000 $ 0
2032 Senior Notes | Senior Notes      
Debt Instrument [Line Items]      
Principle amount $ 300,000,000.0 $ 300,000,000.0  
Stated interest rate 7.375% 7.375%  
Proceeds from issuance of debt $ 292,500,000    
Unamortized debt issuance expense $ 7,500,000 $ 7,500,000  
Effective interest rate 7.84% 7.84%  
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 | Maximum | Debt Conversion, Condition One | Debt Instrument, Redemption, Period One      
Debt Instrument [Line Items]      
Repurchase price, percent of principal amount   40.00%