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Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Millions
 12 Months Ended
Nov. 05, 2016
USD ($)
Oct. 01, 2014
USD ($)
Dec. 31, 2016
USD ($)
segment
shares
Jan. 02, 2016
USD ($)
shares
Jan. 03, 2015
USD ($)
shares
Dec. 28, 2013
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Excess Tax Benefit from Share-based Compensation, Operating Activities     $ 13,000,000 $ 3,000,000 $ 400,000  
Litigation Settlement, Amount   $ 466,800,000        
Short-term investments     0 0    
Accounts receivable, net of allowance for doubtful accounts     101,720,000 80,960,000    
Accumulated depreciation and amortization on property and equipment     13,000,000 11,800,000 9,200,000  
Accumulated amortization     21,313,000 16,336,000    
Cost of patents, Gross     5,000,000 5,400,000    
Cost of trademarks, Gross     600,000 900,000    
Capitalized Software Development Costs for Software Sold to Customers     $ 0 500,000 500,000  
Product life estimate     7 years      
Capitalized Computer Software, Amortization     $ 100,000 200,000 200,000  
Unamortized cost by company     800,000 900,000    
Impairment of goodwill, intangible assets and other long-lived assets     $ 0 0 0  
Number of Sources of Product Revenue | segment     4      
Royalty Revenue, Number of Days Royalty Revenue is Adjusted Subsequent to Quarter End     60 days      
Advertising costs       11,000,000 10,700,000 $ 10,700,000
Foreign currency transaction gain (loss)     $ 100,000 $ 500,000 $ 1,000,000  
Options to purchase of shares of common stock | shares     0.2 0.7 5.7  
Number of reportable segments | segment     1      
Patents            
Summary Of Significant Accounting Policies [Line Items]            
Estimated life maximum     10 years      
Accumulated amortization     $ 7,427,000 $ 7,743,000    
Total renewal costs capitalized     $ 600,000 700,000    
Weighted average number of years until the next renewal     1 year      
Trademarks            
Summary Of Significant Accounting Policies [Line Items]            
Estimated life maximum     17 years      
Accumulated amortization     $ 1,331,000 1,106,000    
Total renewal costs capitalized       600,000    
Weighted average number of years until the next renewal     6 years      
Patents and trademarks            
Summary Of Significant Accounting Policies [Line Items]            
Accumulated amortization     $ 3,800,000 $ 4,200,000 $ 3,400,000  
Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Product life estimate     3 years      
Warranty period for defects in material and workmanship     6 months      
Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Product life estimate     6 years      
Warranty period for defects in material and workmanship     48 months      
Restricted Stock Units (RSUs) [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Weighted Average Number of Shares, Contingently Issuable | shares     2.7      
Masimo vs Philips N.V. [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Litigation Settlement, Amount $ 300,000,000          
Collaborative Arrangement, Rights and Obligations     30