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Commitments and Contingencies - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2014 USD ($) | Jan. 16, 2014 USD ($) | Jan. 03, 2014 USD ($) | Aug. 21, 2013 claim | Jul. 09, 2009 patent | Sep. 30, 2011 sales_representatives | Oct. 03, 2015 USD ($) distributor Agreement | Sep. 27, 2014 USD ($) distributor | Mar. 29, 2014 USD ($) | Oct. 03, 2015 USD ($) distributor Agreement | Sep. 27, 2014 USD ($) distributor | Jan. 03, 2015 USD ($) distributor | Dec. 28, 2013 USD ($) | Jan. 31, 2014 participant
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued rent expense |  |  |  |  |  |  | $ 200,000 |  |  | $ 200,000 |  | $ 400,000 |  |
Rental expense related to operating leases |  |  |  |  |  |  | 1,200,000 | $ 1,600,000 |  | $ 4,000,000 | $ 4,800,000 |  |  |
Company contribution percentage based on employee contribution of up to 3% of employee's compensation |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |
Company's contribution to employee retirement savings plan |  |  |  |  |  |  | $ 600,000 | $ 600,000 |  | $ 1,800,000 | $ 1,800,000 |  |  |
Initial term of agreement |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Severance plan participation agreements | Agreement |  |  |  |  |  |  | 7 |  |  | 7 |  |  |  |
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |
Purchase Commitment, Remaining Minimum Amount Committed |  |  |  |  |  |  | $ 85,500,000 |  |  | $ 85,500,000 |  |  |  |
Other Commitment |  |  |  |  |  |  | 300,000 |  |  | 300,000 |  |  |  |
Bank balances |  |  |  |  |  |  | 84,900,000 |  |  | 84,900,000 |  | 92,900,000 |  |
Bank balance covered by Federal Deposit Insurance Corporation limit |  |  |  |  |  |  | 2,300,000 |  |  | 2,300,000 |  |  |  |
Money Market Funds, at Carrying Value |  |  |  |  |  |  | 1,200,000 |  |  | 1,200,000 |  | 1,100,000 |  |
Time Deposits, at Carrying Value |  |  |  |  |  |  | $ 17,500,000 |  |  | $ 17,500,000 |  | $ 40,500,000 |  |
Percentage of revenue one customer |  |  |  |  |  |  | 15.00% | 14.00% |  | 15.00% | 14.00% |  |  |
Percentage of revenue two customer |  |  |  |  |  |  | 12.00% | 12.00% |  | 12.00% | 11.00% |  |  |
Royalty |  |  |  |  |  |  | $ 7,972,000 | $ 6,976,000 |  | $ 23,266,000 | $ 21,988,000 |  |  |
Royalty Rate Percentage |  |  |  |  |  |  |  |  |  | 7.75% |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in loss contingency accrual |  |  |  |  |  |  |  |  | $ (8,000,000) |  |  |  |  |
Number of participants in the surfactant, positive pressure, and oxygenation randomized trial | participant |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Accounts Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, just-in-time distributors | distributor |  |  |  |  |  |  |  |  |  | 3 |  | 3 |  |
Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, just-in-time distributors | distributor |  |  |  |  |  |  | 2 | 2 |  | 2 | 2 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rates on capital lease |  |  |  |  |  |  |  |  |  | 4.30% |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rates on capital lease |  |  |  |  |  |  |  |  |  | 5.20% |  |  |  |
Sales Revenue, Product Line [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of company's products to customers |  |  |  |  |  |  | $ 81,000,000 | $ 75,200,000 |  | $ 251,900,000 | $ 228,900,000 |  |  |
Just in time distributor one |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors |  |  |  |  |  |  |  |  |  | 9.00% |  | 9.00% |  |
Just in time distributor two |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors |  |  |  |  |  |  |  |  |  | 8.00% |  | 6.00% |  |
Just In Time Distributor Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors |  |  |  |  |  |  |  |  |  | 5.00% |  | 5.00% |  |
Masimo vs. Philips |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of patents allegedly infringed | patent |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Masimo vs. Mindray DS USA, Inc. and Shenzhen Mindray Bio-Medical Electronics |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, new claims filed | claim |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Masimo vs Former Physician Office Sales Representatives |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount |  | $ 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employment Agreement, Severance Terms |  |  |  |  |  |  | 80,900,000 |  |  | $ 80,900,000 |  |  |  |
Reimbursement of Certain Tax Withholding, Excise Taxes, Gross Up |  |  |  |  |  |  | $ 125,000,000 |  |  | $ 125,000,000 |  |  |  |

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