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Debt - Additional Information (Details)
1 Months Ended 3 Months Ended 9 Months Ended
May 14, 2018
USD ($)
$ / shares
Jul. 31, 2017
USD ($)
day
$ / shares
Jul. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Jun. 15, 2019
USD ($)
Nov. 30, 2018
CAD ($)
Debt Instrument [Line Items]                    
Principal amount         $ 317,543,000 $ 317,543,000        
Share price (in dollars per share) | $ / shares         $ 6.46 $ 6.46        
Carrying amount         $ 247,886,000 $ 247,886,000 $ 238,594,000 $ 235,664,000    
Amount outstanding         $ 317,543,000 317,543,000 317,976,000 318,202,000    
2025 Convertible Notes                    
Debt Instrument [Line Items]                    
If-converted value in excess of principal amount           $ 0        
2024 Convertible Notes                    
Debt Instrument [Line Items]                    
Stated interest rate   2.875%                
Principal amount   $ 143,750,000                
Effective interest rate         9.00% 9.00%        
If-converted value in excess of principal amount           $ 0        
Convertible senior notes issued and settled   34,400,000                
2019 Convertible Notes                    
Debt Instrument [Line Items]                    
Stated interest rate       2.125%            
Convertible senior notes issued and settled     $ 30,000,000 $ 200,000,000            
Convertible senior notes repurchased and retired   $ 35,000,000.0                
Remaining aggregate principal amount repurchased                 $ 195,000,000.0  
Common Stock Class A Non-voting | 2024 Convertible Notes                    
Debt Instrument [Line Items]                    
Conversion rate per $1,000 principal amount   0.1                
Conversion price, per share (in dollars per share) | $ / shares   $ 10.00                
Additional Paid-in Capital | 2024 Convertible Notes                    
Debt Instrument [Line Items]                    
Carrying amount         $ 25,300,000 25,300,000        
Senior Notes | 2025 Convertible Notes                    
Debt Instrument [Line Items]                    
Stated interest rate 2.375%                  
Principal amount $ 172,500,000       172,500,000 172,500,000        
Semi-annual stated rate 2.375%                  
Equity component of debt         $ 39,000,000.0 $ 39,000,000.0        
Effective interest rate         9.00% 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                  
Carrying amount         $ 131,378,000 $ 131,378,000 126,210,000 124,542,000    
Amount outstanding         172,500,000 172,500,000 172,500,000 172,500,000    
Senior Notes | 2024 Convertible Notes                    
Debt Instrument [Line Items]                    
Principal amount         143,750,000 143,750,000        
Carrying amount         115,681,000 115,681,000 111,311,000 109,909,000    
Amount outstanding         143,750,000 143,750,000 143,750,000 143,750,000    
Receivables Securitization Facility | CASHMAX secured borrowing facility                    
Debt Instrument [Line Items]                    
Principal amount         295,000 295,000        
Carrying amount         (171,000) (171,000) (19,000) 65,000    
Amount outstanding         $ 295,000 $ 295,000 $ 634,000 $ 804,000    
Debt Conversion, Condition One | Senior Notes | 2025 Convertible Notes                    
Debt Instrument [Line Items]                    
Trading days threshold | day   20                
Consecutive trading day threshold | day   30                
Net-share-settled Warrants | Common Stock Class A Non-voting                    
Debt Instrument [Line Items]                    
Number of securities called (in shares) | shares         0 0 14,300,000      
Strike price for warrants (in dollars per share) | $ / shares             $ 20.83      
Class of warrant or right, outstanding (in shares) | shares         0 0        
Variable Interest Entity, Primary Beneficiary | Receivables Securitization Facility | CASHMAX secured borrowing facility                    
Debt Instrument [Line Items]                    
Maximum borrowing amount                   $ 25,000,000