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Debt - Carrying amount of Notes (Details) - USD ($)
$ in Thousands
9 Months Ended
Oct. 03, 2020
Dec. 28, 2019
0.625% Convertible Senior Notes (2025 Notes)    
Equity component    
Effective interest rate 5.336%  
Amortization period of debt discount and debt issuance costs 4 years 8 months 12 days  
1.375% Convertible Senior Notes (2022 Notes)    
Equity component    
Effective interest rate 4.75%  
Amortization period of debt discount and debt issuance costs 1 year 4 months 24 days  
Convertible Senior Notes    
Liability component    
Principal $ 680,567 $ 400,000
Unamortized debt discount (110,135) (27,580)
Unamortized debt issuance costs (8,754) (4,163)
Net carrying amount 561,678 368,257
Equity component    
Net carrying amount $ 109,624 $ 57,735