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Commitments and Contingencies - Additional Information (Detail)
shares in Millions
 3 Months Ended 12 Months Ended
Jul. 27, 2017
Jan. 03, 2014
USD ($)
Mar. 31, 2018
USD ($)
distributor
Agreement
shares
Apr. 01, 2017
USD ($)
distributor
shares
Dec. 30, 2017
USD ($)
distributor
Dec. 28, 2013
USD ($)
Jan. 31, 2014
participant
Contingencies And Commitments [Line Items]              
Long-Lived Assets     $ 283,287,000   $ 278,020,000    
Concentration Risk, Long-lived Asset Geographic Area, Percentage     100.00%   100.00%    
Sales Revenue, Goods, Net     $ 204,389,000 $ 182,466,000      
Concentration Risk, Percentage     100.00% 100.00%      
Options to purchase of shares of common stock | shares     0.9 0.1      
Accrued rent expense     $ 1,500,000        
Rental expense related to operating leases     $ 1,800,000 $ 1,600,000      
Company contribution percentage based on employee contribution of up to 3% of employee's compensation     3.00%        
Severance plan participation agreements | Agreement     7        
Supplemental Unemployment Benefits, Severance Benefits, Required Notice of Resignation     6 months        
Purchase Commitment, Remaining Minimum Amount Committed     $ 84,400,000        
Other Commitment     500,000        
Bank balances     369,500,000        
Bank balance covered by Federal Deposit Insurance Corporation limit     3,400,000        
Number of participants in the surfactant, positive pressure, and oxygenation randomized trial | participant             2
Royalty     $ 8,100,000 $ 8,200,000      
Percentage Of Revenue One Customer     13.60% 13.80%      
Percentage Of Revenue Two Customer     10.70% 12.10%      
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     1   1    
Sales Revenue, Product Line [Member]              
Contingencies And Commitments [Line Items]              
Revenue Customer Concentration     $ 119,100,000 $ 99,600,000      
Just in time distributor one [Member]              
Contingencies And Commitments [Line Items]              
Percentage Of Accounts Receivable Balance From Two Just In Time Distributor     6.50%   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          
International              
Contingencies And Commitments [Line Items]              
Company's contribution to employee retirement savings plan     $ 100,000        
United States              
Contingencies And Commitments [Line Items]              
Company's contribution to employee retirement savings plan     700,000 600,000      
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     $ 12,756,000   $ 12,342,000    
Concentration Risk, Long-lived Asset Geographic Area, Percentage     4.50%   4.40%    
Reportable Geographical Components | United States              
Contingencies And Commitments [Line Items]              
Long-Lived Assets     $ 270,531,000   $ 265,678,000    
Concentration Risk, Long-lived Asset Geographic Area, Percentage     95.50%   95.60%    
Sales Revenue, Goods, Net     $ 141,040,000 $ 128,789,000      
Concentration Risk, Percentage     69.00% 70.50%      
Reportable Geographical Components | Europe, Middle East and Africa              
Contingencies And Commitments [Line Items]              
Sales Revenue, Goods, Net     $ 44,046,000 $ 30,790,000      
Concentration Risk, Percentage     21.60% 16.90%      
Reportable Geographical Components | Asia and Australia              
Contingencies And Commitments [Line Items]              
Sales Revenue, Goods, Net     $ 12,906,000 $ 16,583,000      
Concentration Risk, Percentage     6.30% 9.10%      
Reportable Geographical Components | North and South America (excluding United States)              
Contingencies And Commitments [Line Items]              
Sales Revenue, Goods, Net     $ 6,397,000 $ 6,304,000      
Concentration Risk, Percentage     3.10% 3.50%