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Commitments and Contingencies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 08, 2016
USD ($)
Jan. 26, 2016
ft²
Nov. 04, 2015
USD ($)
Oct. 01, 2014
USD ($)
Jan. 16, 2014
USD ($)
Jan. 03, 2014
USD ($)
Jul. 09, 2009
patent
Sep. 30, 2011
sales_representatives
Apr. 02, 2016
USD ($)
distributor
Agreement
Apr. 04, 2015
USD ($)
Jan. 02, 2016
distributor
Oct. 21, 2015
Jan. 31, 2014
participant
Contingencies And Commitments [Line Items]                          
Property Plant and Equipment, Occupied Square Feet | ft²   70,700                      
Accrued rent expense                 $ 200,000        
Rental expense related to operating leases                 1,200,000 $ 1,500,000      
Capital Leases, Future Minimum Payments, Interest Included in Payments                 $ 100,000        
Company contribution percentage based on employee contribution of up to 3% of employee's compensation                 3.00%        
Company's contribution to employee retirement savings plan                 $ 500,000        
Severance plan participation agreements | Agreement                 7        
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation                 6 months        
Purchase Commitment, Remaining Minimum Amount Committed                 $ 54,100,000        
Other Commitment                 500,000        
Bank balances                 89,700,000        
Bank balance covered by Federal Deposit Insurance Corporation limit                 3,000,000        
Money Market Funds, at Carrying Value                 200,000        
Time Deposits, at Carrying Value                 $ 50,000,000        
Percentage of revenue two customer                 11.20% 13.00%      
Percentage Of Revenue One Customer                 16.00% 14.00%      
Royalty                 $ 7,877,000 $ 7,180,000      
Royalty Rate Percentage                 7.75%        
Number of days royalty revenue is adjusted subsequent to quarter end                 60 days        
Number of former sales representatives | sales_representatives               2          
Litigation settlement amount       $ 466,800,000                  
Number of participants in the surfactant, positive pressure, and oxygenation randomized trial | participant                         2
Number of inter partes review petitions, Patent Trial and Appeal Board of the US Patent Office                       3  
Accounts Receivable [Member]                          
Contingencies And Commitments [Line Items]                          
Concentration Risk, Just-in-time Distributors | distributor                 3   2    
Sales                          
Contingencies And Commitments [Line Items]                          
Concentration Risk, Just-in-time Distributors | distributor                 2        
Sales Revenue, Product Line [Member]                          
Contingencies And Commitments [Line Items]                          
Sale of company's products to customers                 $ 91,900,000 86,300,000      
Just in time distributor one                          
Contingencies And Commitments [Line Items]                          
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors                 7.80%        
Percentage Of Accounts Receivable Balance From Two Just In Time Distributor                     5.50%    
Just in time distributor two                          
Contingencies And Commitments [Line Items]                          
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors                 7.90%        
Percentage Of Accounts Receivable Balance From Two Just In Time Distributor                     5.30%    
Just In Time Distributor Three [Member]                          
Contingencies And Commitments [Line Items]                          
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors                 6.20%        
Masimo vs. Philips                          
Contingencies And Commitments [Line Items]                          
Number of patents allegedly infringed | patent             1            
Masimo vs Former Physician Office Sales Representatives                          
Contingencies And Commitments [Line Items]                          
Litigation settlement amount         $ 5,400,000                
Masimo vs. Physicians Healthsource, Inc.                          
Contingencies And Commitments [Line Items]                          
Loss contingency, damages sought           $ 500              
Parent Company [Member]                          
Contingencies And Commitments [Line Items]                          
Royalty                   $ 7,180,000      
Number of patents allegedly infringed | patent             2            
Philips Patent [Member]                          
Contingencies And Commitments [Line Items]                          
Number of patents allegedly infringed | patent             1            
Employment Contracts [Member]                          
Contingencies And Commitments [Line Items]                          
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award     2.7                    
Employment Agreement, Severance Terms     $ 35,000,000                    
Employment Agreement, Severance Terms     10.00%                    
Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination                 $ 149,700,000        
Subsequent Event [Member] | Masimo vs Former Physician Office Sales Representatives                          
Contingencies And Commitments [Line Items]                          
Litigation settlement amount $ 6,200,000