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Employee Benefits - Narrative (Details) $ in Millions	12 Months Ended
	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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