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Commitments and Contingencies - Additional Information (Detail)
$ / shares in Units, shares in Thousands
 12 Months Ended
Jul. 27, 2017
Jul. 13, 2016
ft²
Jan. 26, 2016
ft²
Nov. 04, 2015
USD ($)
Jan. 03, 2014
USD ($)
Dec. 30, 2017
USD ($)
ft²
distributor
Agreement
$ / shares
shares
Dec. 31, 2016
USD ($)
distributor
$ / shares
shares
Jan. 02, 2016
USD ($)
$ / shares
shares
Dec. 28, 2013
USD ($)
Jan. 31, 2014
participant
Contingencies And Commitments [Line Items]                    
Property Plant and Equipment, Occupied Square Feet | ft²   32,518 70,700     16,830        
Lessee, Operating Lease, Term of Contract   10 years 10 years              
Accrued rent expense           $ 1,500,000 $ 700,000      
Rental expense related to operating leases           $ 6,700,000 5,300,000 $ 5,200,000    
Employee contribution percentage limit for full consideration under Employee Retirement Savings Plan           3.00%        
Severance plan participation agreements | Agreement           5        
Required notice of resignation           6 months        
Remaining amount committed           $ 74,100,000        
Commitments and contingencies (Notes 4 and 17)                
Bank balances           315,200,000        
Bank balance covered by Federal Deposit Insurance Corporation limit           3,300,000        
Concentration Risk, Customer Accounts Receivable, Percentage             13.60%      
Royalty and other revenue           32,800,000        
Royalty and Other Revenue           $ 56,784,000 $ 30,779,000 30,777,000    
Royalty rate Percentage           7.75%        
Royalty Revenue, Number of Days Royalty Revenue is Adjusted Subsequent to Quarter End           60 days        
Litigation settlement, award and/or defense costs           $ 0 (270,000,000) (19,609,000)    
Number of Participants in the Surfactant, Positive Pressure, and Oxygenation Randomized Trial | participant                   2
Pulse oximetry products                    
Contingencies And Commitments [Line Items]                    
Sale of company's products to customers           417,200,000 $ 375,000,000 337,400,000    
Masimo vs Former Physician Office Sales Representatives                    
Contingencies And Commitments [Line Items]                    
Litigation settlement, award and/or defense costs                 $ 2,600,000  
Litigation Settlement, Interest Rate                 10.00%  
Masimo vs. Physicians Healthsource, Inc. [Member]                    
Contingencies And Commitments [Line Items]                    
Damages sought per violation         $ 500          
Parent Company [Member]                    
Contingencies And Commitments [Line Items]                    
Litigation settlement, award and/or defense costs               $ (19,609,000)    
Unsecured Bank Guarantees                    
Contingencies And Commitments [Line Items]                    
Commitments and contingencies (Notes 4 and 17)           300,000        
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      
Restricted Stock Units (RSUs)                    
Contingencies And Commitments [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expired in Period | shares           0 0 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares           $ 86.42 $ 43.09 $ 41.45    
Just in time distributor one | Sales Revenue, Net [Member]                    
Contingencies And Commitments [Line Items]                    
Percentage Of Revenue Two Customer           12.70% 14.00% 14.60%    
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% 5.60%      
Just in time distributor two | Sales Revenue, Net [Member]                    
Contingencies And Commitments [Line Items]                    
Percentage Of Revenue Two Customer           11.20% 12.80% 11.70%    
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%        
Percentage of accounts receivable balance from two just-in-time distributor             7.50%      
United States                    
Contingencies And Commitments [Line Items]                    
Company's contribution to employee retirement savings plan           $ 2,200,000 $ 1,900,000 $ 1,800,000    
OUTSIDE UNITED STATES [Domain]                    
Contingencies And Commitments [Line Items]                    
Company's contribution to employee retirement savings plan               $ 300,000    
Chief Executive Officer                    
Contingencies And Commitments [Line Items]                    
Supplemental Unemployment Benefits, Severance Benefits       $ 35,000,000            
Employment Agreement, Severance Terms       10.00%            
Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination           $ 292,900,000        
Chief Executive Officer | Employee Stock Option                    
Contingencies And Commitments [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award       300000            
Chief Executive Officer | Restricted Stock Units (RSUs)                    
Contingencies And Commitments [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award       2.7            
Employment Agreement, Severance Terms 50.00%                  
Chief Executive Officer | Cash Distribution [Member]                    
Contingencies And Commitments [Line Items]                    
Employment Agreement, Severance Terms 50.00%                  
Maximum | Chief Executive Officer | Deferred Bonus [Member]                    
Contingencies And Commitments [Line Items]                    
Employment Agreement, Severance Terms 200.00%     100.00%