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Commitments and Contingencies - Additional Information (Detail)
shares in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 27, 2017
Jan. 03, 2014
USD ($)
Jun. 30, 2018
USD ($)
Agreement
shares
Mar. 31, 2018
distributor
Jul. 01, 2017
USD ($)
shares
Apr. 01, 2017
distributor
Jun. 30, 2018
USD ($)
distributor
Agreement
shares
Jul. 01, 2017
USD ($)
shares
Jun. 30, 2012
USD ($)
Dec. 30, 2017
USD ($)
distributor
Dec. 28, 2013
USD ($)
Jan. 31, 2014
participant
Contingencies And Commitments [Line Items]                        
Long-Lived Assets     $ 285,294,000       $ 285,294,000     $ 278,020,000    
Concentration Risk, Long-lived Asset Geographic Area, Percentage     100.00%       100.00%     100.00%    
Sales Revenue, Goods, Net     $ 202,004,000   $ 179,727,000   $ 406,393,000 $ 362,193,000        
Concentration Risk, Percentage     100.00%   100.00%   100.00% 100.00%        
Options to purchase of shares of common stock | shares     1.2   0.1   1.1 0.1        
Accrued rent expense     $ 1,500,000       $ 1,500,000     $ 1,500,000    
Rental expense related to operating leases     $ 1,700,000   $ 1,600,000   $ 3,500,000 $ 3,200,000        
Company contribution percentage based on employee contribution of up to 3% of employee's compensation             3.00%          
Severance plan participation agreements | Agreement     8       8          
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation             6 months          
Purchase Commitment, Remaining Minimum Amount Committed     $ 75,900,000       $ 75,900,000          
Other Commitment     1,400,000       1,400,000          
Bank balances     429,600,000       429,600,000          
Bank balance covered by Federal Deposit Insurance Corporation limit     2,900,000       2,900,000          
Number of participants in the surfactant, positive pressure, and oxygenation randomized trial | participant                       2
Royalty     $ 9,100,000   $ 9,200,000   $ 17,200,000 $ 17,400,000        
Concentration Risk, Customer             0.05          
Percentage Of Revenue One Customer     11.30%   13.30%   12.50% 13.70%        
Percentage Of Revenue Two Customer     11.10%   11.30%   10.90% 11.70%        
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 | distributor       2   2            
Accounts Receivable [Member]                        
Contingencies And Commitments [Line Items]                        
Concentration Risk, Just-in-time Distributors | distributor             0     1    
Sales Revenue, Product Line [Member]                        
Contingencies And Commitments [Line Items]                        
Revenue Customer Concentration     $ 115,900,000   $ 105,500,000   $ 234,900,000 $ 205,100,000        
Just in time distributor one [Member]                        
Contingencies And Commitments [Line Items]                        
Percentage Of Accounts Receivable Balance From Two Just In Time Distributor                   6.50%    
Masimo vs Former Agency Tender [Member]                        
Contingencies And Commitments [Line Items]                        
Litigation Settlement, Expense                     $ 10,500,000  
Proceeds from Legal Settlements                     400,000  
Masimo vs Former Physician Office Sales Representatives [Member]                        
Contingencies And Commitments [Line Items]                        
Litigation Settlement, Expense                     $ 2,600,000  
Litigation Settlement, Interest Rate                     10.00%  
Masimo vs. Physicians Healthsource, Inc.                        
Contingencies And Commitments [Line Items]                        
Loss contingency, damages sought   $ 500                    
Masimo vs Dominion Assets [Domain]                        
Contingencies And Commitments [Line Items]                        
Litigation Settlement, Expense                 $ 5,700,000      
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     600,000   600,000   1,300,000 1,200,000        
Chief Executive Officer [Member]                        
Contingencies And Commitments [Line Items]                        
Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination             292,900,000          
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member]                        
Contingencies And Commitments [Line Items]                        
Employment Agreement, Severance Terms 50.00%                      
Chief Executive Officer [Member] | Cash Distribution [Member]                        
Contingencies And Commitments [Line Items]                        
Employment Agreement, Severance Terms 50.00%                      
Reportable Geographical Components | International                        
Contingencies And Commitments [Line Items]                        
Long-Lived Assets     $ 13,343,000       $ 13,343,000     $ 12,342,000    
Concentration Risk, Long-lived Asset Geographic Area, Percentage     4.70%       4.70%     4.40%    
Reportable Geographical Components | United States                        
Contingencies And Commitments [Line Items]                        
Long-Lived Assets     $ 271,951,000       $ 271,951,000     $ 265,678,000    
Concentration Risk, Long-lived Asset Geographic Area, Percentage     95.30%       95.30%     95.60%    
Sales Revenue, Goods, Net     $ 140,134,000   $ 123,265,000   $ 281,175,000 $ 252,054,000        
Concentration Risk, Percentage     69.40%   68.60%   69.20% 69.60%        
Reportable Geographical Components | Europe, Middle East and Africa                        
Contingencies And Commitments [Line Items]                        
Sales Revenue, Goods, Net     $ 34,328,000   $ 33,385,000   $ 78,374,000 $ 64,175,000        
Concentration Risk, Percentage     17.00%   18.60%   19.30% 17.70%        
Reportable Geographical Components | Asia and Australia                        
Contingencies And Commitments [Line Items]                        
Sales Revenue, Goods, Net     $ 20,497,000   $ 17,491,000   $ 33,403,000 $ 34,074,000        
Concentration Risk, Percentage     10.10%   9.70%   8.20% 9.40%        
Reportable Geographical Components | North and South America (excluding United States)                        
Contingencies And Commitments [Line Items]                        
Sales Revenue, Goods, Net     $ 7,045,000   $ 5,586,000   $ 13,441,000 $ 11,890,000        
Concentration Risk, Percentage     3.50%   3.10%   3.30% 3.30%