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Commitments and Contingencies - Additional Information - (Detail) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 27, 2017 | Jan. 03, 2014 USD ($) | Dec. 30, 2017 USD ($) | Dec. 28, 2019 USD ($) distributor Agreement | Dec. 29, 2018 USD ($) distributor | Dec. 30, 2017 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 |  |  |  | $ 5,000,000.0 |  |
License fee, Change in Control |  |  |  | 2,500,000 |  |
Royalty Guarantees, Commitments, Change in Control |  |  |  | 15,000,000.0 |  |
Royalty Guarantees, Commitments, Additional, Change in Control |  |  |  | 2,000,000.0 |  |
Remaining amount committed |  |  |  | 108,400,000 |  |
Commitments and contingencies |  |  |  |  |  |
Long-term Purchase Commitment, Amount |  |  |  | 47,300,000 |  |
Cash and cash equivalents |  |  |  | 687,700,000 |  |
Short-term investments |  |  |  | 120,000,000 | 0 |
Cash Equivalents, at Carrying Value |  |  |  | 567,700,000 |  |
Bank balance covered by Federal Deposit Insurance Corporation limit |  |  |  | $ 3,800,000 |  |
Royalty Agreement |  |  |  | 1 |  |
Royalty |  |  |  | $ 700,000 | 26,400,000 | $ 32,800,000
NRE Service Agreement |  |  |  | 1 |  |
Other Recurring Income |  |  |  | $ 700,000 | 2,000,000.0 | 19,200,000
Litigation settlement, award and/or defense costs |  |  |  | $ 0 | $ 425,000 | $ 0
Pulse oximetry products |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Percentage of Revenue - Customer Concentration |  |  |  | 55.30% | 56.70% | 56.50%
Masimo vs Former Agency Tender |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Litigation settlement, award and/or defense costs |  |  | $ 10,500,000 |  |  |
Proceeds from Legal Settlements |  |  |  | $ 2,000,000.0 |  |
Masimo vs. Physicians Healthsource, Inc. |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Damages sought per violation |  | $ 500 |  |  |  |
Unsecured Bank Guarantees |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Commitments and contingencies |  |  |  | $ 2,300,000 |  |
Sales |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Number of just-in-time distributors | distributor |  |  |  |  | 2 |
Accounts Receivable |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Number of just-in-time distributors | distributor |  |  |  | 1 |  |
Just in time distributor one | Revenue Benchmark |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Percentage Of Revenue Two Customer |  |  |  | 13.00% | 12.90% | 13.70%
Just in time distributor one | Accounts Receivable |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors |  |  |  | 6.20% | 6.70% |
Just in time distributor two | Revenue Benchmark |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Percentage Of Revenue Two Customer |  |  |  | 11.10% | 10.40% | 12.10%
United States (U.S.) |  |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |  |
Company's contribution to employee retirement savings plan |  |  |  | $ 2,500,000 | $ 2,300,000 | $ 2,200,000
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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