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Commitments and Contingencies - Additional Information (Detail)				3 Months Ended			6 Months Ended	9 Months Ended
	Jul. 08, 2019 USD ($)	Jul. 27, 2017	Jan. 03, 2014 USD ($)	Oct. 02, 2021 USD ($) distributor Customer Agreement	Sep. 26, 2020 USD ($) distributor	Jun. 30, 2018 USD ($)	Jun. 27, 2020 USD ($)	Oct. 02, 2021 USD ($) distributor Customer Agreement	Sep. 26, 2020 USD ($) distributor	Jan. 02, 2021
Contingencies And Commitments [Line Items]
Company contribution percentage based on employee contribution of up to 3% of employee's compensation								3.00%
Company's contribution to employee retirement savings plan				$ 900,000	$ 800,000			$ 2,800,000	$ 2,400,000
Severance plan participation agreements | Agreement				5				5
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation								6 months
Purchase Commitment, Remaining Minimum Amount Committed				$ 155,900,000				$ 155,900,000
Other Commitment				3,400,000				3,400,000
Bank Balances				652,400,000				652,400,000
Bank balance covered by Federal Deposit Insurance Corporation limit				$ 5,000,000				$ 5,000,000
Percentage Of Revenue One Customer				15.00%	11.00%			14.60%	11.20%
Percentage Of Revenue Two Customer				10.40%	9.30%			10.40%	10.00%
Concentration Risk, AR Balance One Customer | Customer				1				1
Loss Contingency, Damages Awarded, Value	$ 10,500,000
Sales
Contingencies And Commitments [Line Items]
Concentration Risk, Just-in-time Distributors | distributor				2	2			2	2
Accounts Receivable
Contingencies And Commitments [Line Items]
Percentage of Accounts Receivable Balance				9.40%				9.40%		9.10%
Sales Revenue, Product Line
Contingencies And Commitments [Line Items]
Percentage of Revenue - Customer Concentration				55.00%	48.10%			51.80%	49.60%
Masimo vs Former Agency Tender
Contingencies And Commitments [Line Items]
Litigation Settlement, Expense						$ 10,500,000
Proceeds from Legal Settlements							$ 2,000,000
Masimo vs. Physicians Healthsource, Inc.
Contingencies And Commitments [Line Items]
Loss contingency, damages sought			$ 500
Chief Executive Officer
Contingencies And Commitments [Line Items]
Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination								$ 292,900,000
Chief Executive Officer | Cash Distribution
Contingencies And Commitments [Line Items]
Employment Agreement, Severance Terms		50.00%
Chief Executive Officer | Restricted Stock Units (RSUs)
Contingencies And Commitments [Line Items]
Employment Agreement, Severance Terms		50.00%

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