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Commitments and Contingencies - Additional Information (Detail) |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 20, 2016 USD ($) | Apr. 08, 2016 USD ($) | Jan. 26, 2016 ft² | Nov. 04, 2015 USD ($) | Oct. 01, 2014 USD ($) | Jan. 16, 2014 USD ($) | Jan. 03, 2014 USD ($) | Jul. 09, 2009 patent | Sep. 30, 2011 sales_representatives | Oct. 01, 2016 USD ($) distributor Agreement | Oct. 03, 2015 USD ($) | Oct. 01, 2016 USD ($) ft² distributor Agreement | Oct. 03, 2015 USD ($) | Jan. 02, 2016 USD ($) distributor | Oct. 21, 2015 | Jan. 31, 2014 participant
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property Plant and Equipment, Occupied Square Feet | ft² |  |  | 70,700 |  |  |  |  |  |  |  |  | 16,830 |  |  |  |
Accrued rent expense |  |  |  |  |  |  |  |  |  | $ 600,000 |  | $ 600,000 |  | $ 200,000 |  |
Rental expense related to operating leases |  |  |  |  |  |  |  |  |  | 1,500,000 | $ 1,200,000 | 4,500,000 | $ 4,100,000 |  |  |
Capital Leases, Future Minimum Payments, Interest Included in Payments |  |  |  |  |  |  |  |  |  | $ 100,000 |  | $ 100,000 |  |  |  |
Company contribution percentage based on employee contribution of up to 3% of employee's compensation |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |
Severance plan participation agreements | Agreement |  |  |  |  |  |  |  |  |  | 7 |  | 7 |  |  |  |
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |
Purchase Commitment, Remaining Minimum Amount Committed |  |  |  |  |  |  |  |  |  | $ 42,800,000 |  | $ 42,800,000 |  |  |  |
Other Commitment |  |  |  |  |  |  |  |  |  | 500,000 |  | 500,000 |  |  |  |
Bank balances |  |  |  |  |  |  |  |  |  | 125,000,000 |  | 125,000,000 |  |  |  |
Bank balance covered by Federal Deposit Insurance Corporation limit |  |  |  |  |  |  |  |  |  | 2,100,000 |  | 2,100,000 |  |  |  |
Time Deposits, at Carrying Value |  |  |  |  |  |  |  |  |  | 62,500,000 |  | 62,500,000 |  |  |  |
Royalty |  |  |  |  |  |  |  |  |  | $ 7,335,000 | $ 7,972,000 | $ 23,241,000 | $ 23,266,000 |  |  |
Number of former sales representatives | sales_representatives |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Litigation settlement amount |  |  |  |  | $ 466,800,000 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |
Percentage Of Revenue One Customer |  |  |  |  |  |  |  |  |  | 14.00% | 14.50% | 15.00% | 14.60% |  |  |
Percentage Of Revenue Two Customer |  |  |  |  |  |  |  |  |  | 13.20% | 11.60% | 12.40% | 12.00% |  |  |
Number of days royalty revenue is adjusted subsequent to quarter end |  |  |  |  |  |  |  |  |  |  |  | 60 days |  |  |  |
Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Just-in-time Distributors |  |  |  |  |  |  |  |  |  | 2 | 2 | 2 | 2 |  |  |
Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Just-in-time Distributors | distributor |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 2 |  |
Sales Revenue, Product Line [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Customer Concentration |  |  |  |  |  |  |  |  |  | $ 94,500,000 | $ 81,000,000 | $ 279,800,000 | $ 251,900,000 |  |  |
Just in time distributor one [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Accounts Receivable Balance From Two Just In Time Distributor |  |  |  |  |  |  |  |  |  |  |  | 11.50% |  | 5.50% |  |
Just in time distributor two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Accounts Receivable Balance From Two Just In Time Distributor |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.30% |  |
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 |  | $ 6,200,000 |  |  |  | $ 5,400,000 |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Expense | $ 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Masimo vs. Physicians Healthsource, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, damages sought |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty |  |  |  |  |  |  |  |  |  |  | 7,972,000 |  | 23,266,000 |  |  |
Number of patents allegedly infringed | patent |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Philips Patent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents allegedly infringed | patent |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Employment Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award |  |  |  | 2.7 |  |  |  |  |  |  |  |  |  |  |  |
Employment Agreement, Severance Terms |  |  |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Employment Agreement, Severance Terms |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination |  |  |  |  |  |  |  |  |  |  |  | $ 195,600,000 |  |  |  |
International |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's contribution to employee retirement savings plan |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 | 200,000 | 200,000 |  |  |
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's contribution to employee retirement savings plan |  |  |  |  |  |  |  |  |  | $ 500,000 | $ 400,000 | $ 1,600,000 | $ 1,400,000 |  |  |

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