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Employee Benefits - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2023 USD ($) plan | Dec. 31, 2022 USD ($) | Dec. 30, 2023 USD ($) plan | Dec. 31, 2022 USD ($) | Jan. 01, 2022 USD ($)
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan, number of plans | plan | 1 |  | 1 |  |
Expected long-term return on plan assets |  |  | 3.53% | 1.70% |
Other |  |  | $ 2.0 | $ 1.8 |
Defined benefit plan, plan assets, foreign currency revaluation |  |  | 4.3 |  |
Actual net gain on plan assets |  |  | 1.1 | (2.5) |
Benefits paid |  |  | 0.8 | 2.8 |
Other, includes translation |  |  | 3.8 | 1.8 |
Defined benefit plan, benefit obligation, foreign currency revaluation |  |  | 6.1 |  |
Actuarial gain |  |  | (2.3) | (1.9) |
Unfunded balance | $ (9.5) | $ (10.1) | (9.5) | (10.1) |
Employer contributions |  |  | 0.4 | 1.5 |
Expected contributions for next fiscal year | 1.8 |  | $ 1.8 |  |
Masimo Retirement Savings Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Percent of employees pay |  |  | 100.00% |  |
Percent of match |  |  | 3.00% |  |
Company's contribution to employee retirement savings plan | $ 4.9 | $ 4.5 |  |  | $ 3.4
Masimo Retirement Savings Plan | Foreign Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Company's contribution to employee retirement savings plan |  |  | $ 5.5 | $ 4.3 | $ 0.0

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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