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Commitments and Contingencies - Additional Information (Detail)			3 Months Ended			6 Months Ended		12 Months Ended
	Jul. 27, 2017	Jan. 03, 2014 USD ($)	Jun. 27, 2020 USD ($) distributor Customer Agreement	Jun. 29, 2019 USD ($) distributor	Dec. 30, 2017 USD ($)	Jun. 27, 2020 USD ($) distributor Customer Agreement	Jun. 29, 2019 USD ($) distributor	Dec. 28, 2019 USD ($)
Contingencies And Commitments [Line Items]
Company contribution percentage based on employee contribution of up to 3% of employee's compensation						3.00%
Severance plan participation agreements | Agreement			8			8
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation						6 months
Purchase Commitment, Remaining Minimum Amount Committed			$ 232,300,000			$ 232,300,000
Other Commitment			2,500,000			2,500,000
Bank Balances			681,900,000			681,900,000
Bank balance covered by Federal Deposit Insurance Corporation limit			$ 4,200,000			$ 4,200,000
Percentage Of Revenue One Customer			8.80%	13.30%		11.30%	13.50%
Percentage Of Revenue Two Customer			8.30%	12.10%		10.40%	11.20%
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			10.30%			10.30%		19.00%
Sales Revenue, Product Line
Contingencies And Commitments [Line Items]
Percentage of Revenue - Customer Concentration			45.90%	56.80%		50.30%	56.50%
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 | Restricted Stock Units (RSUs)
Contingencies And Commitments [Line Items]
Employment Agreement, Severance Terms	50.00%
Chief Executive Officer | Cash Distribution
Contingencies And Commitments [Line Items]
Employment Agreement, Severance Terms	50.00%
UNITED STATES
Contingencies And Commitments [Line Items]
Company's contribution to employee retirement savings plan			$ 800,000	$ 700,000		$ 1,600,000	$ 1,200,000

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