Debt - Interest expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Dec. 28, 2019
Interest expense related to the notes
Interest Expense, Total	$ 31,033	$ 34,142	$ 20,233
Convertible Senior Notes
Interest expense related to the notes
Contractual interest expense	3,662	5,530	5,485
Amortization of debt discount	21,112	19,375	11,717
Amortization of debt issuance costs	1,655	2,058	1,768
Interest Expense, Total	$ 26,429	$ 26,963	$ 18,970