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Debt - Additional Information (Details)
1 Months Ended 3 Months Ended
May 05, 2020
USD ($)
May 29, 2018
USD ($)
Mar. 03, 2017
USD ($)
Mar. 22, 2017
USD ($)
Oct. 03, 2020
USD ($)
Jun. 27, 2020
USD ($)
1.75% Senior Convertible Notes | Convertible Notes            
Debt details            
Interest rate on senior convertible notes   1.75%     1.75%  
Aggregate principal amount of convertible debt   $ 225,000,000.0        
Proceeds from convertible debt   $ 69,500,000        
Effective discount rate   5.30%        
Derivative, term of contract   5 years        
Expected remaining term         2 years 8 months 12 days  
Proceeds from debt, net of issuance costs   $ 67,300,000        
Fair market value of convertible debt         $ 250,900,000 $ 251,400,000
1.75% Senior Convertible Notes | Convertible Notes | Exchange Transaction            
Debt details            
Debt issued   155,500,000        
Repayments of debt   $ 151,500,000        
1.00% Senior Convertible Notes | Convertible Notes            
Debt details            
Interest rate on senior convertible notes     1.00%   1.00%  
Aggregate principal amount of convertible debt     $ 400,000,000.0 $ 60,000,000.0    
Effective discount rate     4.80%      
Derivative, term of contract     7 years      
Expected remaining term         3 years 4 months 24 days  
Proceeds from debt, net of issuance costs       $ 451,100,000    
Fair market value of convertible debt         $ 524,800,000 523,300,000
Revolving Credit Facility            
Debt details            
Maximum borrowing capacity $ 300,000,000          
Credit facility increase limit $ 200,000,000          
Net leverage ratio 1.50          
Debt outstanding         $ 0 $ 0
Minimum | Revolving Credit Facility            
Debt details            
Commitment fee 0.30%          
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility            
Debt details            
Basis spread on variable rate 1.75%          
Minimum | Base Rate | Revolving Credit Facility            
Debt details            
Basis spread on variable rate 0.75%          
Maximum | Revolving Credit Facility            
Debt details            
Commitment fee 0.40%          
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility            
Debt details            
Basis spread on variable rate 2.50%          
Maximum | Base Rate | Revolving Credit Facility            
Debt details            
Basis spread on variable rate 1.50%