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Commitments and Contingencies - Additional Information (Detail)			3 Months Ended		12 Months Ended
	Jul. 27, 2017	Jan. 03, 2014 USD ($)	Mar. 30, 2019 USD ($) distributor Agreement	Mar. 31, 2018 USD ($) distributor	Dec. 29, 2018 distributor	Dec. 28, 2013 USD ($)
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
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation			6 months
Purchase Commitment, Remaining Minimum Amount Committed			$ 87,300,000
Other Commitment			1,000,000
Bank balances			412,900,000
Bank balance covered by Federal Deposit Insurance Corporation limit			$ 3,500,000
Percentage Of Revenue One Customer			13.60%	13.60%
Percentage Of Revenue Two Customer			10.30%	10.70%
Sales
Contingencies And Commitments [Line Items]
Concentration Risk, Just-in-time Distributors | distributor			2	2
Accounts Receivable
Contingencies And Commitments [Line Items]
Concentration Risk, Just-in-time Distributors | distributor			1		1
Sales Revenue, Product Line
Contingencies And Commitments [Line Items]
Revenue Customer Concentration			$ 129,700,000	$ 118,900,000
Just in time distributor two
Contingencies And Commitments [Line Items]
Percentage Of Accounts Receivable Balance From Two Just In Time Distributor			6.50%
Just in time distributor one
Contingencies And Commitments [Line Items]
Percentage Of Accounts Receivable Balance From Two Just In Time Distributor					6.70%
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
International
Contingencies And Commitments [Line Items]
Company's contribution to employee retirement savings plan			$ 100,000	100,000
United States (U.S.)
Contingencies And Commitments [Line Items]
Company's contribution to employee retirement savings plan			500,000	$ 700,000
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%

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