Commitments and Contingencies - Additional Information (Detail) $ / shares in Units, shares in Thousands								1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 26, 2016 ft²	Jan. 02, 2016 USD ($) Agreement	Nov. 16, 2015 USD ($)	Oct. 01, 2014 USD ($)	Jan. 16, 2014 USD ($)	Jan. 03, 2014 USD ($)	Jul. 09, 2009 patent	Sep. 30, 2011 sales_representatives	Mar. 29, 2014 USD ($)	Dec. 28, 2013 USD ($)	Jan. 02, 2016 USD ($) ft² distributor Agreement $ / shares shares	Jan. 03, 2015 USD ($) distributor $ / shares shares	Dec. 28, 2013 USD ($) $ / shares shares	Oct. 21, 2015 claim	Oct. 03, 2015 USD ($)	Jan. 31, 2014 participant
Contingencies And Commitments [Line Items]
Property Plant and Equipment, Occupied Square Feet | ft²											108,000
Accrued rent expense		$ 200,000									$ 200,000	$ 400,000
Rental expense related to operating leases											4,800,000	6,100,000	$ 5,100,000
Interest included in future minimum capital lease payments (less than $0.1 million)		$ 100,000									$ 100,000
Employee contribution percentage limit for full consideration under Employee Retirement Savings Plan											3.00%
Company's contribution to employee retirement savings plan											$ 1,800,000	$ 1,700,000	1,500,000
Severance plan participation agreements | Agreement		7									7
Required notice of resignation											6 months
Remaining amount committed		$ 35,900,000									$ 35,900,000
Commitments and contingencies (Note 15)
Bank balances		$ 57,200,000									$ 57,200,000
Bank balance covered by Federal Deposit Insurance Corporation limit		2,400,000									2,400,000
Money market funds		20,100,000									20,100,000
Uninsured deposits		55,000,000									55,000,000
Royalty											$ 30,777,000	$ 29,879,000	29,816,000
Royalty rate Percentage											7.75%
Royalty Revenue, Number of Days Royalty Revenue is Adjusted Subsequent to Quarter End											60 days
Number of Former Sales Representatives | sales_representatives								2
Litigation settlement amount				$ 466,800,000
Litigation settlement, award and/or defense costs											$ (19,609,000)	(10,331,000)	8,010,000
Loss Contingency Accrual, Period Increase (Decrease)									$ (8,000,000)
Number of Participants in the Surfactant, Positive Pressure, and Oxygenation Randomized Trial | participant																2
Number of inter partes review petitions, Patent Trial and Appeal Board of the US Patent Office | claim														3
Automobiles
Contingencies And Commitments [Line Items]
Operating lease expiration date											Dec. 01, 2020
Pulse oximetry products
Contingencies And Commitments [Line Items]
Sale of company's products to customers											$ 337,400,000	309,900,000	287,900,000
Masimo vs. Philips
Contingencies And Commitments [Line Items]
Number of patents allegedly infringed | patent							1
Masimo vs Former Physician Office Sales Representatives
Contingencies And Commitments [Line Items]
Litigation settlement amount					$ 5,400,000
Litigation Settlement Interest		700,000
Litigation settlement, award and/or defense costs										$ 2,600,000
Masimo vs. Physicians Healthsource, Inc. [Member]
Contingencies And Commitments [Line Items]
Damages sought per violation						$ 500
Parent Company [Member]
Contingencies And Commitments [Line Items]
Number of patents allegedly infringed | patent							2
Litigation settlement, award and/or defense costs											(19,609,000)	(8,010,000)	$ 8,010,000
Philips Patent [Member]
Contingencies And Commitments [Line Items]
Number of patents allegedly infringed | patent							1
Unsecured Bank Guarantees
Contingencies And Commitments [Line Items]
Commitments and contingencies (Note 15)		300,000									300,000
Revolving Credit Facility [Member]
Contingencies And Commitments [Line Items]
Long-term Line of Credit, Noncurrent		$ 185,000,000									$ 185,000,000	$ 125,000,000
CEO Employment Agreement [Member]
Contingencies And Commitments [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award											2.7
Supplemental Unemployment Benefits, Severance Benefits															$ 35,000,000
Employment Agreement, Severance Terms											10.00%
Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination											$ 146,900,000
Sales [Member]
Contingencies And Commitments [Line Items]
Number of just-in-time distributors | distributor											2
Accounts Receivable [Member]
Contingencies And Commitments [Line Items]
Number of just-in-time distributors | distributor											2	2
Lease Agreements [Member]
Contingencies And Commitments [Line Items]
Property Plant and Equipment, Occupied Square Feet | ft²	70,700
Restricted Stock Units (RSUs) [Member]
Contingencies And Commitments [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expired in Period | shares											0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares											$ 41.45	$ 0.00	$ 0.00
Installment Payment, First [Domain] | Shenzhen Mindray [Member]
Contingencies And Commitments [Line Items]
Litigation settlement amount			$ 25,000,000
Just in time distributor one
Contingencies And Commitments [Line Items]
Percentage Of Revenue Two Customer											0.00%	0.00%	0.00%
Just in time distributor two | Accounts Receivable [Member]
Contingencies And Commitments [Line Items]
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors											5.30%
Percentage of accounts receivable balance from two just-in-time distributor												8.80%
Just In Time Distributor Three [Member] | Accounts Receivable [Member]
Contingencies And Commitments [Line Items]
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors											5.50%	5.00%