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Debt - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Oct. 10, 2018
Aug. 15, 2018
May 29, 2018
Mar. 03, 2017
Mar. 22, 2018
Sep. 28, 2019
Sep. 29, 2018
Jun. 29, 2019
Mar. 22, 2017
Debt details                  
Repayments of convertible debt           $ 0 $ 134,300,000    
1.75% Senior Convertible Notes | Convertible Notes                  
Debt details                  
Aggregate principal amount of convertible debt     $ 225,000,000.0            
Interest rate on senior convertible notes     1.75%     1.75%      
Proceeds from convertible debt     $ 69,500,000            
Effective discount rate     5.30%            
Derivative, term of contract     5 years            
Expected remaining term           3 years 8 months 12 days      
Proceeds from debt, net of issuance costs     $ 67,300,000            
Fair market value of convertible debt           $ 271,800,000   $ 261,300,000  
1.00% Senior Convertible Notes | Convertible Notes                  
Debt details                  
Aggregate principal amount of convertible debt       $ 400,000,000.0         $ 60,000,000.0
Interest rate on senior convertible notes           1.00%      
Effective discount rate       4.80%          
Derivative, term of contract       7 years          
Expected remaining term           4 years 4 months 24 days      
Proceeds from debt, net of issuance costs         $ 451,100,000        
Fair market value of convertible debt           $ 567,000,000.0   $ 540,800,000  
0.625% Senior Convertible Notes | Convertible Notes                  
Debt details                  
Interest rate on senior convertible notes           0.625%      
Debt redemption $ 142,700,000                
Repayments of convertible debt   $ 134,300,000              
2033 Notes Redeemed By Holders | Convertible Notes                  
Debt details                  
Debt redemption 112,000,000.0                
Repayments of convertible debt $ 111,800,000                
Shares issued in debt conversion (in shares) 231,795                
2033 Notes Redeemed By The Company | Convertible Notes                  
Debt details                  
Debt redemption $ 30,700,000                
Repayments of convertible debt $ 30,800,000                
Exchange Transaction | 1.75% Senior Convertible Notes | Convertible Notes                  
Debt details                  
Debt issued     155,500,000            
Exchange Transaction | 0.625% Senior Convertible Notes | Convertible Notes                  
Debt details                  
Repayments of debt     $ 151,500,000