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Commitments and Contingencies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 20, 2016
USD ($)
Apr. 08, 2016
USD ($)
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
Oct. 01, 2016
USD ($)
distributor
Agreement
Oct. 03, 2015
USD ($)
Oct. 01, 2016
USD ($)
ft²
distributor
Agreement
Oct. 03, 2015
USD ($)
Jan. 02, 2016
USD ($)
distributor
Oct. 21, 2015
Jan. 31, 2014
participant
Contingencies And Commitments [Line Items]                                
Property Plant and Equipment, Occupied Square Feet | ft²     70,700                 16,830        
Accrued rent expense                   $ 600,000   $ 600,000   $ 200,000    
Rental expense related to operating leases                   1,500,000 $ 1,200,000 4,500,000 $ 4,100,000      
Capital Leases, Future Minimum Payments, Interest Included in Payments                   $ 100,000   $ 100,000        
Company contribution percentage based on employee contribution of up to 3% of employee's compensation                       3.00%        
Severance plan participation agreements | Agreement                   7   7        
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation                       6 months        
Purchase Commitment, Remaining Minimum Amount Committed                   $ 42,800,000   $ 42,800,000        
Other Commitment                   500,000   500,000        
Bank balances                   125,000,000   125,000,000        
Bank balance covered by Federal Deposit Insurance Corporation limit                   2,100,000   2,100,000        
Time Deposits, at Carrying Value                   62,500,000   62,500,000        
Royalty                   $ 7,335,000 $ 7,972,000 $ 23,241,000 $ 23,266,000      
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  
Percentage Of Revenue One Customer                   14.00% 14.50% 15.00% 14.60%      
Percentage Of Revenue Two Customer                   13.20% 11.60% 12.40% 12.00%      
Number of days royalty revenue is adjusted subsequent to quarter end                       60 days        
Sales [Member]                                
Contingencies And Commitments [Line Items]                                
Concentration Risk, Just-in-time Distributors                   2 2 2 2      
Accounts Receivable [Member]                                
Contingencies And Commitments [Line Items]                                
Concentration Risk, Just-in-time Distributors | distributor                       1   2    
Sales Revenue, Product Line [Member]                                
Contingencies And Commitments [Line Items]                                
Revenue Customer Concentration                   $ 94,500,000 $ 81,000,000 $ 279,800,000 $ 251,900,000      
Just in time distributor one [Member]                                
Contingencies And Commitments [Line Items]                                
Percentage Of Accounts Receivable Balance From Two Just In Time Distributor                       11.50%   5.50%    
Just in time distributor two [Member]                                
Contingencies And Commitments [Line Items]                                
Percentage Of Accounts Receivable Balance From Two Just In Time Distributor                           5.30%    
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   $ 6,200,000       $ 5,400,000                    
Litigation Settlement, Expense $ 2,600,000                              
Masimo vs. Physicians Healthsource, Inc.                                
Contingencies And Commitments [Line Items]                                
Loss contingency, damages sought             $ 500                  
Parent Company [Member]                                
Contingencies And Commitments [Line Items]                                
Royalty                     7,972,000   23,266,000      
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                       $ 195,600,000        
International                                
Contingencies And Commitments [Line Items]                                
Company's contribution to employee retirement savings plan                   100,000 100,000 200,000 200,000      
United States                                
Contingencies And Commitments [Line Items]                                
Company's contribution to employee retirement savings plan                   $ 500,000 $ 400,000 $ 1,600,000 $ 1,400,000