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Debt - Additional Information (Details)
1 Months Ended 6 Months Ended
May 14, 2018
day
$ / shares
Jul. 31, 2017
USD ($)
day
$ / shares
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
May 31, 2018
USD ($)
Debt Instrument [Line Items]            
Principal amount     $ 316,250,000      
Carrying amount     257,143,000 $ 251,229,000 $ 244,555,000  
2024 Convertible Notes            
Debt Instrument [Line Items]            
Stated interest rate   2.875%        
Principal amount   $ 143,750,000        
2024 Convertible Notes | Common Stock Class A Non-voting            
Debt Instrument [Line Items]            
Conversion rate per $1,000 principal amount   0.1        
Conversion price, per share (in dollars per share) | $ / shares   $ 10.00        
2024 Convertible Notes | Additional Paid-in Capital            
Debt Instrument [Line Items]            
Equity component of debt, gross     39,800,000      
Carrying amount     $ 25,300,000      
Effective interest rate     9.00%      
2024 Convertible Notes | Senior Notes            
Debt Instrument [Line Items]            
Principal amount     $ 143,750,000      
Carrying amount     120,307,000 117,193,000 114,196,000  
2024 Convertible Notes | Debt Conversion, Condition One | Senior Notes            
Debt Instrument [Line Items]            
Trading days threshold | day   20        
Consecutive trading day threshold | day   30        
2025 Convertible Notes            
Debt Instrument [Line Items]            
Stated interest rate 2.375%         2.375%
Principal amount           $ 172,500,000
2025 Convertible Notes | Additional Paid-in Capital            
Debt Instrument [Line Items]            
Equity component of debt, gross     49,600,000      
2025 Convertible Notes | Senior Notes            
Debt Instrument [Line Items]            
Principal amount     172,500,000      
Carrying amount     $ 136,836,000 133,164,000 129,624,000  
Effective interest rate     9.00%      
Conversion rate per $1,000 principal amount 0.0628931          
Conversion price, per share (in dollars per share) | $ / shares $ 15.90          
Share price (in dollars per share) | $ / shares $ 15.90          
2025 Convertible Notes | Senior Notes | Additional Paid-in Capital            
Debt Instrument [Line Items]            
Equity component of debt     $ 39,100,000      
2025 Convertible Notes | Debt Conversion, Condition One | Senior Notes            
Debt Instrument [Line Items]            
Trading days threshold | day 20          
Consecutive trading day threshold | day 30          
CASHMAX secured borrowing facility | Receivables Securitization Facility            
Debt Instrument [Line Items]            
Carrying amount     $ 0 $ 0 $ (248,000)