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Commitments and Contingencies - Additional Information (Detail) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 27, 2017 | Jan. 03, 2014 USD ($) | Sep. 28, 2019 USD ($) distributor Customer Agreement | Sep. 29, 2018 USD ($) distributor | Dec. 30, 2017 USD ($) | Sep. 28, 2019 USD ($) distributor Customer Agreement | Sep. 29, 2018 USD ($) distributor | Dec. 29, 2018 USD ($)
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Company contribution percentage based on employee contribution of up to 3% of employee's compensation |  |  |  |  |  | 3.00% |  |
Severance plan participation agreements | Agreement |  |  | 8 |  |  | 8 |  |
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation |  |  |  |  |  | 6 months |  |
Purchase Commitment, Remaining Minimum Amount Committed |  |  | $ 90,000,000.0 |  |  | $ 90,000,000.0 |  |
Other Commitment |  |  | 2,300,000 |  |  | 2,300,000 |  |
Bank balances |  |  | 633,400,000 |  |  | 633,400,000 |  |
Short-term investments |  |  | 120,000,000 |  |  | 120,000,000 |  | $ 0
Cash Equivalents, at Carrying Value |  |  | 513,400,000 |  |  | 513,400,000 |  |
Bank balance covered by Federal Deposit Insurance Corporation limit |  |  | $ 3,500,000 |  |  | $ 3,500,000 |  |
Percentage Of Revenue One Customer |  |  | 12.60% | 12.30% |  | 13.20% | 12.40% |
Percentage Of Revenue Two Customer |  |  | 10.60% | 9.40% |  | 11.00% | 10.40% |
Concentration Risk, AR Balance One Customer | Customer |  |  | 1 |  |  | 1 |  |
Loss Contingency, Damages Awarded, Value |  |  | $ 10,500,000 |  |  |  |  |
Sales |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Concentration Risk, Just-in-time Distributors | distributor |  |  | 2 | 2 |  | 2 | 2 |
Accounts Receivable |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Percentage of Accounts Receivable Balance |  |  | 21.40% |  |  | 21.40% |  | 13.90%
Sales Revenue, Product Line |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Percentage of Revenue - Customer Concentration |  |  | 56.00% | 57.10% |  | 56.30% | 57.60% |
Masimo vs Former Agency Tender |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  | $ 10,500,000 |  |  |
Proceeds from Legal Settlements |  |  |  |  |  |  |  | $ 2,000,000.0
Masimo vs. Physicians Healthsource, Inc. |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Loss contingency, damages sought |  | $ 500 |  |  |  |  |  |
United States (U.S.) |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Company's contribution to employee retirement savings plan |  |  | $ 700,000 | $ 500,000 |  | $ 1,900,000 | $ 1,800,000 |
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 |  |  |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |  |  |
Employment Agreement, Severance Terms | 50.00% |  |  |  |  |  |  |

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