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Debt - Carrying amount of Notes (Details) - 1.375% Convertible Senior Notes - USD ($)
$ in Thousands
3 Months Ended
Apr. 04, 2020
Dec. 28, 2019
Liability component    
Principal $ 400,000 $ 400,000
Unamortized debt discount (24,335) (27,580)
Unamortized debt issuance costs (3,672) (4,163)
Net carrying amount 371,993 368,257
Equity component    
Net carrying amount $ 57,735 $ 57,735
Effective interest rate 4.75%  
Amortization period of debt discount and debt issuance costs 1 year 10 months 24 days