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Employee Benefits - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 28, 2024 USD ($) plan | Dec. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan, number of plans | plan | 1 |  |
Higher benefits paid | $ (2.2) |  |
Higher employer contributions | 1.5 |  |
Lower actuarial gains | 1.9 |  |
Foreign currency revaluation period increase | (2.2) |  |
Actuarial gain | (0.4) | $ (2.3) |
Unfunded balance | (9.0) | (9.5) |
Employer contributions | 1.9 | 0.4 |
Expected contributions for next fiscal year | $ 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 | $ 4.6 | 4.9 | $ 4.5
Masimo Retirement Savings Plan | Foreign Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Company's contribution to employee retirement savings plan | $ 6.1 | $ 5.5 | $ 0.0

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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