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Debt - Principal Payment Schedule (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Debt Instrument [Line Items]      
Gross Amount $ 367,762 $ 367,762 $ 367,762
Senior Notes      
Debt Instrument [Line Items]      
Remaining 2024 34,389    
Fiscal 2025 103,373    
Fiscal 2026 0    
Fiscal 2027 0    
Fiscal 2028 0    
Thereafter 230,000    
Gross Amount 367,762    
Senior Notes | 2029 Convertible Notes      
Debt Instrument [Line Items]      
Remaining 2024 0    
Fiscal 2025 0    
Fiscal 2026 0    
Fiscal 2027 0    
Fiscal 2028 0    
Thereafter 230,000    
Gross Amount 230,000 230,000 230,000
Senior Notes | 2025 Convertible Notes      
Debt Instrument [Line Items]      
Remaining 2024 0    
Fiscal 2025 103,373    
Fiscal 2026 0    
Fiscal 2027 0    
Fiscal 2028 0    
Thereafter 0    
Gross Amount 103,373 103,373 103,373
Senior Notes | 2024 Convertible Notes      
Debt Instrument [Line Items]      
Remaining 2024 34,389    
Fiscal 2025 0    
Fiscal 2026 0    
Fiscal 2027 0    
Fiscal 2028 0    
Thereafter 0    
Gross Amount $ 34,389 $ 34,389 $ 34,389