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Fair Value of Financial Instruments - Fair values of other financial instruments (Details) - USD ($) $ in Millions | Jan. 01, 2022 | Jan. 02, 2021 | Jun. 01, 2020 | Mar. 06, 2017
--- | --- | --- | --- | ---
0.625% Convertible Senior Notes (2025 Notes) |  |  |  |
Fair values of other financial instruments |  |  |  |
Interest rate (as a percent) | 0.625% |  | 0.625% |
Fair value of debt | $ 944.3 | $ 671.4 |  |
1.375% Convertible Senior Notes (2022 Notes) |  |  |  |
Fair values of other financial instruments |  |  |  |
Interest rate (as a percent) |  |  |  | 1.375%

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