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Debt - Outstanding Obligations (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
May 31, 2018
May 14, 2018
Jul. 31, 2017
Gross Amount            
Total $ 316,250 $ 317,122 $ 317,514      
Less current portion 0 213 267      
Total long-term debt 316,250 316,909 317,247      
Debt Discount and Issuance Costs            
Total (59,107) (65,893) (72,959)      
Less current portion 0 0 0      
Total long-term debt (59,107) (65,893) (72,959)      
Carrying Amount            
Total 257,143 251,229 244,555      
Less current portion 0 213 267      
Total long-term debt 257,143 251,016 244,288      
2024 Convertible Notes            
Carrying Amount            
Stated interest rate           2.875%
2025 Convertible Notes            
Carrying Amount            
Stated interest rate       2.375% 2.375%  
Senior Notes | 2024 Convertible Notes            
Gross Amount            
Total 143,750 143,750 143,750      
Debt Discount and Issuance Costs            
Total (23,443) (26,557) (29,554)      
Carrying Amount            
Total 120,307 117,193 114,196      
Senior Notes | 2025 Convertible Notes            
Gross Amount            
Total 172,500 172,500 172,500      
Debt Discount and Issuance Costs            
Total (35,664) (39,336) (42,876)      
Carrying Amount            
Total 136,836 133,164 129,624      
Unsecured Debt | 8.5% unsecured debt due 2024            
Gross Amount            
Total 0 872 983      
Debt Discount and Issuance Costs            
Total 0 0 0      
Carrying Amount            
Total $ 0 872 983      
Stated interest rate 8.50%          
Receivables Securitization Facility | CASHMAX secured borrowing facility            
Gross Amount            
Total $ 0 0 281      
Debt Discount and Issuance Costs            
Total 0 0 (529)      
Carrying Amount            
Total $ 0 $ 0 $ (248)