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Commitments and Contingencies - Additional Information (Detail)				3 Months Ended			12 Months Ended
	Jul. 08, 2019 USD ($)	Jul. 27, 2017	Jan. 03, 2014 USD ($)	Apr. 03, 2021 USD ($) Customer Agreement distributor	Mar. 28, 2020 USD ($) distributor	Dec. 30, 2017 USD ($)	Dec. 28, 2019 USD ($)	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
Severance plan participation agreements | Agreement				5
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation				6 months
Purchase Commitment, Remaining Minimum Amount Committed				$ 125,000,000.0
Other Commitment				2,500,000
Bank Balances				552,000,000.0
Bank balance covered by Federal Deposit Insurance Corporation limit				$ 4,600,000
Percentage Of Revenue One Customer				13.70%	14.60%
Percentage Of Revenue Two Customer				10.80%	12.30%
Concentration Risk, AR Balance One Customer | Customer				1
Loss Contingency, Damages Awarded, Value	$ 10,500,000
Sales
Contingencies And Commitments [Line Items]
Concentration Risk, Just-in-time Distributors | distributor				2	2
Accounts Receivable
Contingencies And Commitments [Line Items]
Percentage of Accounts Receivable Balance				10.30%				9.10%
Sales Revenue, Product Line
Contingencies And Commitments [Line Items]
Percentage of Revenue - Customer Concentration				51.30%	55.20%
Masimo vs Former Agency Tender
Contingencies And Commitments [Line Items]
Litigation Settlement, Expense						$ 10,500,000
Proceeds from Legal Settlements							$ 2,000,000.0
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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