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Debt - Carrying amount of Notes (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 03, 2021
Jan. 02, 2021
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 2 months 12 days  
1.375% Convertible Senior Notes (2022 Notes)    
Equity component    
Effective interest rate 4.75%  
Convertible Senior Notes    
Liability component    
Principal $ 535,000 $ 675,567
Unamortized debt discount (93,693) (103,953)
Unamortized debt issuance costs (7,019) (8,189)
Net carrying amount 434,288 563,425
Equity component    
Net carrying amount $ 107,927 $ 108,438