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Commitments and Contingencies - Additional Information - (Detail)
 3 Months Ended 12 Months Ended
Jan. 08, 2019
USD ($)
Jul. 27, 2017
Jan. 03, 2014
USD ($)
Dec. 30, 2017
USD ($)
Dec. 29, 2018
USD ($)
distributor
Agreement
Dec. 30, 2017
USD ($)
distributor
Dec. 31, 2016
USD ($)
Contingencies And Commitments [Line Items]              
Accrued rent expense       $ 1,500,000 $ 1,400,000 $ 1,500,000  
Rental expense related to operating leases         $ 6,900,000 6,700,000 $ 5,900,000
Employee contribution percentage limit for full consideration under Employee Retirement Savings Plan         3.00%    
Severance plan participation agreements | Agreement         8    
Required notice of resignation         6 months    
Royalty Guarantees, Commitments, Amount         $ 5,000,000    
License fee, Change in Control         2,500,000    
Royalty Guarantees, Commitments, Change in Control         15,000,000    
Royalty Guarantees, Commitments, Additional, Change in Control         2,000,000    
Remaining amount committed         90,400,000    
Commitments and contingencies (Note 19)        
Cash and cash equivalents       315,302,000 552,490,000 315,302,000 305,970,000
Bank balance covered by Federal Deposit Insurance Corporation limit         $ 3,300,000    
Royalty Agreement         1    
Royalty         $ 26,400,000 32,800,000 30,800,000
NRE Service Agreement         1    
Other Recurring Income         $ 2,000,000 19,200,000 8,200,000
Royalty and other revenue         $ 28,415,000 52,006,000 38,936,000
Royalty Revenue, Number of Days Royalty Revenue is Adjusted Subsequent to Quarter End         60 days    
Litigation settlement, award and/or defense costs         $ 425,000 0 (270,000,000)
Pulse oximetry products              
Contingencies And Commitments [Line Items]              
Sale of company's products to customers         470,500,000 $ 417,000,000 $ 375,000,000
Masimo vs Former Agency Tender [Member]              
Contingencies And Commitments [Line Items]              
Litigation settlement, award and/or defense costs       $ 10,500,000      
Proceeds from Legal Settlements         2,000,000    
Masimo vs. Physicians Healthsource, Inc. [Member]              
Contingencies And Commitments [Line Items]              
Damages sought per violation     $ 500        
Unsecured Bank Guarantees              
Contingencies And Commitments [Line Items]              
Commitments and contingencies (Note 19)         1,000,000    
Revolving Credit Facility [Member]              
Contingencies And Commitments [Line Items]              
Long-term Line of Credit, Noncurrent         $ 0    
Sales [Member]              
Contingencies And Commitments [Line Items]              
Number of just-in-time distributors | distributor         2    
Accounts Receivable [Member]              
Contingencies And Commitments [Line Items]              
Number of just-in-time distributors | distributor         2 2  
Subsequent Event [Member] | Masimo vs Former Physician Office Sales Representatives              
Contingencies And Commitments [Line Items]              
Litigation settlement, award and/or defense costs $ 400,000            
Just in time distributor one | Sales Revenue, Net [Member]              
Contingencies And Commitments [Line Items]              
Percentage Of Revenue Two Customer         12.50% 12.70% 14.00%
Just in time distributor one | Accounts Receivable [Member]              
Contingencies And Commitments [Line Items]              
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors       6.50% 6.70% 6.50%  
Just in time distributor two | Sales Revenue, Net [Member]              
Contingencies And Commitments [Line Items]              
Percentage Of Revenue Two Customer         10.00% 11.20% 12.80%
Just in time distributor two | Accounts Receivable [Member]              
Contingencies And Commitments [Line Items]              
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors       4.70% 3.20% 4.70%  
United States              
Contingencies And Commitments [Line Items]              
Company's contribution to employee retirement savings plan         $ 2,300,000 $ 2,200,000 $ 1,900,000
OUTSIDE UNITED STATES [Domain]              
Contingencies And Commitments [Line Items]              
Company's contribution to employee retirement savings plan         400,000 $ 300,000 $ 300,000
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 [Member]              
Contingencies And Commitments [Line Items]              
Employment Agreement, Severance Terms   50.00%