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Debt - Schedule of Debt Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
May 14, 2018
Jul. 31, 2017
Debt Instrument [Line Items]        
Gross Amount $ 316,250 $ 317,122    
Debt Discount and Issuance Costs (52,064) (65,893)    
Carrying Amount 264,186 251,229    
Less current portion, Gross Amount 0 213    
Less current portion, Debt Discount and Issuance Costs 0 0    
Less current portion, Carrying Amount 0 213    
Total long-term debt, Gross Amount 316,250 316,909    
Total long-term debt, Debt Discount and Issuance Costs (52,064) (65,893)    
Total long-term debt, Carrying Amount 264,186 251,016    
2024 Convertible Notes        
Debt Instrument [Line Items]        
Stated interest rate       2.875%
Senior Notes | 2024 Convertible Notes        
Debt Instrument [Line Items]        
Gross Amount 143,750 143,750    
Debt Discount and Issuance Costs (20,207) (26,557)    
Carrying Amount 123,543 117,193    
Senior Notes | 2025 Convertible Notes        
Debt Instrument [Line Items]        
Gross Amount 172,500 172,500    
Debt Discount and Issuance Costs (31,857) (39,336)    
Carrying Amount 140,643 133,164 $ 121,300  
Stated interest rate     2.375%  
Unsecured Notes | 8.5% unsecured debt due 2024        
Debt Instrument [Line Items]        
Gross Amount 0 872    
Debt Discount and Issuance Costs 0 0    
Carrying Amount $ 0 $ 872    
Stated interest rate 8.50% 8.50%