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Commitments and Contingencies - Narrative (Detail) $ in Millions			1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 07, 2023 USD ($)	Apr. 21, 2021 patent	Jul. 31, 2017	Sep. 30, 2023 USD ($) customer distributor executiveOfficer	Oct. 01, 2022 distributor	Sep. 30, 2023 USD ($) customer executiveOfficer distributor	Oct. 01, 2022 distributor	Dec. 31, 2022 customer	Oct. 20, 2022 complaint
Contingencies And Commitments [Line Items]
Severance plan participation agreements \| executiveOfficer				5		5
Required notice of resignation						6 months
Royalty obligation				$ 5.0		$ 5.0
License fee				2.5		2.5
Change in control				15.0		15.0
Royalty guarantees, commitments, additional, change in control				2.0		2.0
Remaining commitment				171.6		171.6
Other commitment				4.5		4.5
Bank balances				124.4		124.4
Bank balance covered by federal deposit insurance corporation limit				$ 7.2		$ 7.2
Percentage of revenue one customer				16.80%	8.90%	16.80%	10.50%
Concentration risk, AR balance one customer \| customer				1		1		1
Masimo Vs. Apple Inc \| Pending Litigation
Contingencies And Commitments [Line Items]
Asserted patents found valid \| patent		3
Asserted patents found invalid \| patent		9
Apple, Inc. Patent Infringement \| Pending Litigation
Contingencies And Commitments [Line Items]
Number of complaints \| complaint									2
Masimo Vs. Politan Capital Management LP and Politan Capital NY LLC \| Pending Litigation
Contingencies And Commitments [Line Items]
Attorney fees	$ 18.0
Sales
Contingencies And Commitments [Line Items]
Distributors \| distributor				1	1	1	1
Accounts Receivable
Contingencies And Commitments [Line Items]
Percentage of accounts receivable balance				11.40%		11.40%		9.10%
Sales Revenue, Product Line
Contingencies And Commitments [Line Items]
Percentage of revenue - customer concentration				50.50%	54.00%	52.90%	52.90%
Chief Executive Officer
Contingencies And Commitments [Line Items]
Severance payment period			3 years
Qualifying termination						$ 479.7
Chief Executive Officer \| Cash Distribution
Contingencies And Commitments [Line Items]
Severance terms			50.00%
Chief Executive Officer \| Restricted Stock Units (RSUs)
Contingencies And Commitments [Line Items]
Severance terms			50.00%