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Debt - Carrying amount of Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2021
Jan. 06, 2021
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 6 months    
1.375% Convertible Senior Notes (2022 Notes)      
Liability component      
Principal   $ 140,600  
Equity component      
Effective interest rate 4.75%    
Amortization period of debt discount and debt issuance costs 2 months 12 days    
Convertible Senior Notes      
Liability component      
Principal $ 675,567   $ 400,000
Unamortized debt discount (103,953)   (27,580)
Unamortized debt issuance costs (8,189)   (4,163)
Net carrying amount 563,425   368,257
Equity component      
Net carrying amount $ 108,438   $ 57,735