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Debt - Principal Payment Schedule (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Debt Instrument [Line Items]      
Gross Amount $ 633,373 $ 333,373 $ 367,762
Senior Notes      
Debt Instrument [Line Items]      
Remaining 2025 103,373    
Fiscal 2026 0    
Fiscal 2027 0    
Fiscal 2028 0    
Fiscal 2029 0    
Thereafter 530,000    
Gross Amount 633,373    
Senior Notes | 2032 Senior Notes      
Debt Instrument [Line Items]      
Remaining 2025 0    
Fiscal 2026 0    
Fiscal 2027 0    
Fiscal 2028 0    
Fiscal 2029 0    
Thereafter 300,000    
Gross Amount 300,000    
Senior Notes | 2029 Convertible Notes      
Debt Instrument [Line Items]      
Remaining 2025 0    
Fiscal 2026 0    
Fiscal 2027 0    
Fiscal 2028 0    
Fiscal 2029 0    
Thereafter 230,000    
Gross Amount 230,000 230,000 230,000
Senior Notes | 2025 Convertible Notes      
Debt Instrument [Line Items]      
Remaining 2025 103,373    
Fiscal 2026 0    
Fiscal 2027 0    
Fiscal 2028 0    
Fiscal 2029 0    
Thereafter 0    
Gross Amount $ 103,373 $ 103,373 $ 103,373