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Fair Value of Financial Instruments - Fair values of other financial instruments (Details) - USD ($) $ in Millions | Jul. 03, 2021 | 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 | $ 743.2 | $ 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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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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