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Commitments and Contingencies - Additional Information (Detail) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 27, 2017 | Jan. 03, 2014 USD ($) | Mar. 30, 2019 USD ($) distributor Agreement | Mar. 31, 2018 USD ($) distributor | Dec. 29, 2018 distributor | Dec. 28, 2013 USD ($)
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 |  |  |
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation |  |  | 6 months |  |  |
Purchase Commitment, Remaining Minimum Amount Committed |  |  | $ 87,300,000 |  |  |
Other Commitment |  |  | 1,000,000 |  |  |
Bank balances |  |  | 412,900,000 |  |  |
Bank balance covered by Federal Deposit Insurance Corporation limit |  |  | $ 3,500,000 |  |  |
Percentage Of Revenue One Customer |  |  | 13.60% | 13.60% |  |
Percentage Of Revenue Two Customer |  |  | 10.30% | 10.70% |  |
Sales |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Concentration Risk, Just-in-time Distributors | distributor |  |  | 2 | 2 |  |
Accounts Receivable |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Concentration Risk, Just-in-time Distributors | distributor |  |  | 1 |  | 1 |
Sales Revenue, Product Line |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Revenue Customer Concentration |  |  | $ 129,700,000 | $ 118,900,000 |  |
Just in time distributor two |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Percentage Of Accounts Receivable Balance From Two Just In Time Distributor |  |  | 6.50% |  |  |
Just in time distributor one |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Percentage Of Accounts Receivable Balance From Two Just In Time Distributor |  |  |  |  | 6.70% |
Masimo vs Former Agency Tender |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  |  | $ 10,500,000
Proceeds from Legal Settlements |  |  |  |  |  | $ 2,000,000
Masimo vs. Physicians Healthsource, Inc. |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Loss contingency, damages sought |  | $ 500 |  |  |  |
International |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Company's contribution to employee retirement savings plan |  |  | $ 100,000 | 100,000 |  |
United States (U.S.) |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Company's contribution to employee retirement savings plan |  |  | 500,000 | $ 700,000 |  |
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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