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Commitments and Contingencies - Additional Information (Detail) $ / shares in Units, shares in Thousands |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 27, 2017 | Jul. 13, 2016 ft² | Jan. 26, 2016 ft² | Nov. 04, 2015 USD ($) | Jan. 03, 2014 USD ($) | Dec. 30, 2017 USD ($) ft² distributor Agreement $ / shares shares | Dec. 31, 2016 USD ($) distributor $ / shares shares | Jan. 02, 2016 USD ($) $ / shares shares | Dec. 28, 2013 USD ($) | Jan. 31, 2014 participant
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Property Plant and Equipment, Occupied Square Feet | ft² |  | 32,518 | 70,700 |  |  | 16,830 |  |  |  |
Lessee, Operating Lease, Term of Contract |  | 10 years | 10 years |  |  |  |  |  |  |
Accrued rent expense |  |  |  |  |  | $ 1,500,000 | $ 700,000 |  |  |
Rental expense related to operating leases |  |  |  |  |  | $ 6,700,000 | 5,300,000 | $ 5,200,000 |  |
Employee contribution percentage limit for full consideration under Employee Retirement Savings Plan |  |  |  |  |  | 3.00% |  |  |  |
Severance plan participation agreements | Agreement |  |  |  |  |  | 5 |  |  |  |
Required notice of resignation |  |  |  |  |  | 6 months |  |  |  |
Remaining amount committed |  |  |  |  |  | $ 74,100,000 |  |  |  |
Commitments and contingencies (Notes 4 and 17) |  |  |  |  |  |  |  |  |  |
Bank balances |  |  |  |  |  | 315,200,000 |  |  |  |
Bank balance covered by Federal Deposit Insurance Corporation limit |  |  |  |  |  | 3,300,000 |  |  |  |
Concentration Risk, Customer Accounts Receivable, Percentage |  |  |  |  |  |  | 13.60% |  |  |
Royalty and other revenue |  |  |  |  |  | 32,800,000 |  |  |  |
Royalty and Other Revenue |  |  |  |  |  | $ 56,784,000 | $ 30,779,000 | 30,777,000 |  |
Royalty rate Percentage |  |  |  |  |  | 7.75% |  |  |  |
Royalty Revenue, Number of Days Royalty Revenue is Adjusted Subsequent to Quarter End |  |  |  |  |  | 60 days |  |  |  |
Litigation settlement, award and/or defense costs |  |  |  |  |  | $ 0 | (270,000,000) | (19,609,000) |  |
Number of Participants in the Surfactant, Positive Pressure, and Oxygenation Randomized Trial | participant |  |  |  |  |  |  |  |  |  | 2
Pulse oximetry products |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of company's products to customers |  |  |  |  |  | 417,200,000 | $ 375,000,000 | 337,400,000 |  |
Masimo vs Former Physician Office Sales Representatives |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement, award and/or defense costs |  |  |  |  |  |  |  |  | $ 2,600,000 |
Litigation Settlement, Interest Rate |  |  |  |  |  |  |  |  | 10.00% |
Masimo vs. Physicians Healthsource, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Damages sought per violation |  |  |  |  | $ 500 |  |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement, award and/or defense costs |  |  |  |  |  |  |  | $ (19,609,000) |  |
Unsecured Bank Guarantees |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Commitments and contingencies (Notes 4 and 17) |  |  |  |  |  | 300,000 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit, Noncurrent |  |  |  |  |  | $ 0 |  |  |  |
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 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | $ 86.42 | $ 43.09 | $ 41.45 |  |
Just in time distributor one | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage Of Revenue Two Customer |  |  |  |  |  | 12.70% | 14.00% | 14.60% |  |
Just in time distributor one | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors |  |  |  |  |  | 6.50% | 5.60% |  |  |
Just in time distributor two | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage Of Revenue Two Customer |  |  |  |  |  | 11.20% | 12.80% | 11.70% |  |
Just in time distributor two | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors |  |  |  |  |  | 4.70% |  |  |  |
Percentage of accounts receivable balance from two just-in-time distributor |  |  |  |  |  |  | 7.50% |  |  |
United States |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Company's contribution to employee retirement savings plan |  |  |  |  |  | $ 2,200,000 | $ 1,900,000 | $ 1,800,000 |  |
OUTSIDE UNITED STATES [Domain] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Company's contribution to employee retirement savings plan |  |  |  |  |  |  |  | $ 300,000 |  |
Chief Executive Officer |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Supplemental Unemployment Benefits, Severance Benefits |  |  |  | $ 35,000,000 |  |  |  |  |  |
Employment Agreement, Severance Terms |  |  |  | 10.00% |  |  |  |  |  |
Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination |  |  |  |  |  | $ 292,900,000 |  |  |  |
Chief Executive Officer | Employee Stock Option |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award |  |  |  | 300000 |  |  |  |  |  |
Chief Executive Officer | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award |  |  |  | 2.7 |  |  |  |  |  |
Employment Agreement, Severance Terms | 50.00% |  |  |  |  |  |  |  |  |
Chief Executive Officer | Cash Distribution [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Employment Agreement, Severance Terms | 50.00% |  |  |  |  |  |  |  |  |
Maximum | Chief Executive Officer | Deferred Bonus [Member] |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Employment Agreement, Severance Terms | 200.00% |  |  | 100.00% |  |  |  |  |  |

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