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Debt - Principal Payment Schedule (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Debt Instrument [Line Items]    
Gross Amount $ 333,373 $ 367,762
Senior Notes    
Debt Instrument [Line Items]    
Fiscal 2025 103,373  
Fiscal 2026 0  
Fiscal 2027 0  
Fiscal 2028 0  
Fiscal 2029 0  
Thereafter 230,000  
Gross Amount 333,373  
Senior Notes | 2029 Convertible Notes    
Debt Instrument [Line Items]    
Fiscal 2025 0  
Fiscal 2026 0  
Fiscal 2027 0  
Fiscal 2028 0  
Fiscal 2029 0  
Thereafter 230,000  
Gross Amount 230,000 230,000
Senior Notes | 2025 Convertible Notes    
Debt Instrument [Line Items]    
Fiscal 2025 103,373  
Fiscal 2026 0  
Fiscal 2027 0  
Fiscal 2028 0  
Fiscal 2029 0  
Thereafter 0  
Gross Amount $ 103,373 $ 103,373