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Debt - Components of Convertible Senior Notes (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 28, 2020
Mar. 28, 2020
Dec. 28, 2019
Debt Instrument [Line Items]      
Document Period End Date   Mar. 28, 2020  
Net carrying amount $ 509,564 $ 509,564 $ 323,678
2.125% Convertible Senior Notes      
Debt Instrument [Line Items]      
Principal amount 402,500 402,500 402,500
Unamortized discount (104,972) (104,972) (109,652)
Unamortized issuance cost (6,852) (6,852) (7,158)
Net carrying amount $ 290,676 290,676 $ 285,690
Convertible debt, remaining discount amortization period 54 months    
Senior notes | 2.5% Convertible Senior Notes      
Debt Instrument [Line Items]      
Principal amount $ 200,000 200,000  
Unamortized discount (69,694) (69,694)  
Unamortized issuance cost (4,300) (4,300)  
Net carrying amount $ 126,006 $ 126,006  
Convertible debt, remaining discount amortization period 83 months