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Commitments and Contingencies - Additional Information (Detail) $ / shares in Units, shares in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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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% |  |  |  |

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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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