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Debt - Carrying Amounts of the Liability and Equity Components (Details) - USD ($)
Dec. 29, 2018
Jun. 30, 2018
May 29, 2018
Aug. 21, 2013
Carrying amounts of the liability and equity components:        
Current portion of long-term debt $ 0 $ 275,300,000    
Long-term debt, net of current portion 568,400,000 557,900,000    
Convertible Notes        
Carrying amounts of the liability and equity components:        
Unamortized discount of liability component (109,600,000) (121,100,000)    
Unamortized debt issuance cost (7,000,000) (7,700,000)    
Carrying amount of liability component 568,400,000 833,200,000    
Carrying amount of equity component 136,700,000 239,100,000    
Convertible Notes | 0.625% Senior Convertible Notes        
Carrying amounts of the liability and equity components:        
Principal amount of notes $ 0 277,000,000    
Interest rate on senior convertible notes 0.625%     0.625%
Convertible Notes | 1.00% Senior Convertible Notes        
Carrying amounts of the liability and equity components:        
Principal amount of notes $ 460,000,000 460,000,000    
Interest rate on senior convertible notes 1.00%      
Convertible Notes | 1.75% Senior Convertible Notes        
Carrying amounts of the liability and equity components:        
Principal amount of notes $ 225,000,000 $ 225,000,000    
Interest rate on senior convertible notes 1.75%   1.75%