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Commitments and Contingencies - Additional Information (Detail)				3 Months Ended			9 Months Ended		12 Months Ended
	Jul. 08, 2019 USD ($)	Jul. 27, 2017	Jan. 03, 2014 USD ($)	Sep. 26, 2020 USD ($) distributor Agreement Customer	Sep. 28, 2019 USD ($) distributor	Mar. 31, 2018 USD ($)	Sep. 26, 2020 USD ($) Customer distributor Agreement	Sep. 28, 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%
Company's contribution to employee retirement savings plan				$ 800,000	$ 700,000		$ 2,400,000	$ 1,900,000
Severance plan participation agreements | Agreement				8			8
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation							6 months
Purchase Commitment, Remaining Minimum Amount Committed				$ 162,100,000			$ 162,100,000
Other Commitment				2,600,000			2,600,000
Bank Balances				719,100,000			719,100,000
Bank balance covered by Federal Deposit Insurance Corporation limit				$ 4,400,000			$ 4,400,000
Percentage Of Revenue One Customer				11.00%	10.60%		11.20%	11.00%
Percentage Of Revenue Two Customer				9.30%	12.60%		10.00%	13.20%
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				6.90%			6.90%		19.00%
Sales Revenue, Product Line
Contingencies And Commitments [Line Items]
Percentage of Revenue - Customer Concentration				48.10%	56.00%		49.60%	56.30%
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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