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Commitments and Contingencies - Additional Information (Detail) € in Millions			3 Months Ended				12 Months Ended
	Jul. 27, 2017	Jan. 03, 2014 USD ($)	Mar. 28, 2020 USD ($) Customer distributor Agreement	Mar. 28, 2020 EUR (€) distributor	Mar. 30, 2019 USD ($) distributor	Dec. 30, 2017 USD ($)	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%	3.00%
Severance plan participation agreements | Agreement			8
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation			6 months	6 months
Purchase Commitment, Remaining Minimum Amount Committed			$ 132,100,000
Other Commitment			2,400,000
Long-term Purchase Commitment, Amount | €				€ 29.8
Bank Balances			656,300,000
Bank balance covered by Federal Deposit Insurance Corporation limit			$ 3,900,000
Percentage Of Revenue One Customer			14.60%	14.60%	10.30%
Percentage Of Revenue Two Customer			12.30%	12.30%	13.60%
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	2
Accounts Receivable
Contingencies And Commitments [Line Items]
Percentage of Accounts Receivable Balance			18.00%				19.00%
Sales Revenue, Product Line
Contingencies And Commitments [Line Items]
Percentage of Revenue - Customer Concentration			55.20%	55.20%	56.20%
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 | 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 (U.S.)
Contingencies And Commitments [Line Items]
Company's contribution to employee retirement savings plan			$ 800,000		$ 500,000

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