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Debt - Schedule of Debt Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
May 14, 2018
Jul. 31, 2017
Debt Instrument [Line Items]        
Gross Amount $ 317,122 $ 317,976    
Debt Discount and Issuance Costs (65,893) (79,382)    
Carrying Amount 251,229 238,594    
Less current portion, Gross Amount 213 214    
Less current portion, Debt Discount and Issuance Costs 0 0    
Less current portion, Carrying Amount 213 214    
Total long-term debt, Gross Amount 316,909 317,762    
Total long-term debt, Debt Discount and Issuance Costs (65,893) (79,382)    
Total long-term debt, Carrying Amount 251,016 238,380    
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 (26,557) (32,439)    
Carrying Amount 117,193 111,311    
Senior Notes | 2025 Convertible Notes        
Debt Instrument [Line Items]        
Gross Amount 172,500 172,500    
Debt Discount and Issuance Costs (39,336) (46,290)    
Carrying Amount 133,164 126,210 $ 121,300  
Stated interest rate     2.375%  
Unsecured Notes | 8.5% unsecured debt due 2024        
Debt Instrument [Line Items]        
Gross Amount 872 1,092    
Debt Discount and Issuance Costs 0 0    
Carrying Amount $ 872 $ 1,092    
Stated interest rate 8.50% 8.50%    
Receivables Securitization Facility | CASHMAX        
Debt Instrument [Line Items]        
Gross Amount   $ 634    
Debt Discount and Issuance Costs   (653)    
Carrying Amount   $ (19)