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Commitments and Contingencies - Additional Information - (Detail) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 08, 2019 USD ($) | Jul. 27, 2017 | Jan. 03, 2014 USD ($) | Dec. 30, 2017 USD ($) | Dec. 29, 2018 USD ($) distributor Agreement | Dec. 30, 2017 USD ($) distributor | Dec. 31, 2016 USD ($)
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |
Accrued rent expense |  |  |  | $ 1,500,000 | $ 1,400,000 | $ 1,500,000 |
Rental expense related to operating leases |  |  |  |  | $ 6,900,000 | 6,700,000 | $ 5,900,000
Employee contribution percentage limit for full consideration under Employee Retirement Savings Plan |  |  |  |  | 3.00% |  |
Severance plan participation agreements | Agreement |  |  |  |  | 8 |  |
Required notice of resignation |  |  |  |  | 6 months |  |
Royalty Guarantees, Commitments, Amount |  |  |  |  | $ 5,000,000 |  |
License fee, Change in Control |  |  |  |  | 2,500,000 |  |
Royalty Guarantees, Commitments, Change in Control |  |  |  |  | 15,000,000 |  |
Royalty Guarantees, Commitments, Additional, Change in Control |  |  |  |  | 2,000,000 |  |
Remaining amount committed |  |  |  |  | 90,400,000 |  |
Commitments and contingencies (Note 19) |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 315,302,000 | 552,490,000 | 315,302,000 | 305,970,000
Bank balance covered by Federal Deposit Insurance Corporation limit |  |  |  |  | $ 3,300,000 |  |
Royalty Agreement |  |  |  |  | 1 |  |
Royalty |  |  |  |  | $ 26,400,000 | 32,800,000 | 30,800,000
NRE Service Agreement |  |  |  |  | 1 |  |
Other Recurring Income |  |  |  |  | $ 2,000,000 | 19,200,000 | 8,200,000
Royalty and other revenue |  |  |  |  | $ 28,415,000 | 52,006,000 | 38,936,000
Royalty Revenue, Number of Days Royalty Revenue is Adjusted Subsequent to Quarter End |  |  |  |  | 60 days |  |
Litigation settlement, award and/or defense costs |  |  |  |  | $ 425,000 | 0 | (270,000,000)
Pulse oximetry products |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |
Sale of company's products to customers |  |  |  |  | 470,500,000 | $ 417,000,000 | $ 375,000,000
Masimo vs Former Agency Tender [Member] |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |
Litigation settlement, award and/or defense costs |  |  |  | $ 10,500,000 |  |  |
Proceeds from Legal Settlements |  |  |  |  | 2,000,000 |  |
Masimo vs. Physicians Healthsource, Inc. [Member] |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |
Damages sought per violation |  |  | $ 500 |  |  |  |
Unsecured Bank Guarantees |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |
Commitments and contingencies (Note 19) |  |  |  |  | 1,000,000 |  |
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 |
Subsequent Event [Member] | Masimo vs Former Physician Office Sales Representatives |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |
Litigation settlement, award and/or defense costs | $ 400,000 |  |  |  |  |  |
Just in time distributor one | Sales Revenue, Net [Member] |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |
Percentage Of Revenue Two Customer |  |  |  |  | 12.50% | 12.70% | 14.00%
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% | 6.70% | 6.50% |
Just in time distributor two | Sales Revenue, Net [Member] |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |
Percentage Of Revenue Two Customer |  |  |  |  | 10.00% | 11.20% | 12.80%
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% | 3.20% | 4.70% |
United States |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |
Company's contribution to employee retirement savings plan |  |  |  |  | $ 2,300,000 | $ 2,200,000 | $ 1,900,000
OUTSIDE UNITED STATES [Domain] |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |
Company's contribution to employee retirement savings plan |  |  |  |  | 400,000 | $ 300,000 | $ 300,000
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 [Member] |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |
Employment Agreement, Severance Terms |  | 50.00% |  |  |  |  |

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