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Debt - Additional Information (Details) - Convertible Notes - USD ($)
1 Months Ended 9 Months Ended
May 29, 2018
Mar. 03, 2017
Mar. 22, 2017
Mar. 28, 2020
Jun. 29, 2019
1.75% Senior 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       3 years 2 months 12 days  
Proceeds from debt, net of issuance costs $ 67,300,000        
Fair market value of convertible debt       $ 231,400,000 $ 261,300,000
1.75% Senior Convertible Notes | Exchange Transaction          
Debt details          
Debt issued 155,500,000        
Repayments of debt $ 151,500,000        
1.00% Senior 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 10 months 24 days  
Proceeds from debt, net of issuance costs     $ 451,100,000    
Fair market value of convertible debt       $ 485,500,000 $ 540,800,000