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Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Millions
 12 Months Ended
Nov. 05, 2016
USD ($)
Dec. 30, 2017
USD ($)
segment
shares
Dec. 31, 2016
USD ($)
shares
Jan. 02, 2016
USD ($)
shares
Jan. 03, 2015
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Cash and cash equivalents   $ 315,302,000 $ 305,970,000 $ 132,317,000  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents   315,483,000 308,198,000 132,462,000 $ 134,604,000
Accounts receivable, net of allowance for doubtful accounts   121,309,000 101,667,000    
Accumulated depreciation and amortization on property and equipment   15,200,000 13,000,000 11,800,000  
Accumulated amortization   24,675,000 21,313,000    
Cost of patents, Gross   4,300,000 5,000,000    
Cost of trademarks, Gross   $ 600,000 600,000    
Capitalized Software Development Costs for Software Sold to Customers     0 500,000 $ 500,000
Product life estimate   7 years      
Capitalized Computer Software, Amortization   $ 1,900,000 100,000 200,000  
Unamortized cost by company   800,000 700,000    
Impairment of goodwill, intangible assets and other long-lived assets   $ 400,000.0 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   $ 12,800,000 11,000,000 10,700,000  
Foreign currency transaction gain (loss)   $ 300,000 $ 100,000 $ 500,000  
Options to purchase of shares of common stock | shares   0.4 0.2 0.7  
Number of reportable segments | segment   1      
Patents          
Summary Of Significant Accounting Policies [Line Items]          
Estimated life maximum   10 years      
Accumulated amortization   $ 8,473,000 $ 7,427,000    
Total renewal costs capitalized   $ 200,000 600,000    
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   $ 1,611,000 1,331,000    
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   $ 4,900,000 $ 3,800,000 $ 4,200,000  
Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Retained Earnings, Cumulative Effect, Full Retrospective Method   $ 15,000,000      
Product life estimate   3 years      
Warranty period for defects in material and workmanship   6 months      
Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Retained Earnings, Cumulative Effect, Full Retrospective Method   $ 20,000,000      
Product life estimate   6 years      
Warranty period for defects in material and workmanship   48 months      
Restricted Stock Units (RSUs)          
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 (Deprecated 2017-01-31) $ 300,000,000        
Collaborative Arrangement, Rights and Obligations   30      
Buildings and Improvements | Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment, useful life   7 years      
Buildings and Improvements | Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment, useful life   15 years      
Machinery and equipment | Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment, useful life   5 years      
Machinery and equipment | Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment, useful life   7 years      
Computer equipment | Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment, useful life   2 years      
Computer equipment | Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment, useful life   6 years      
Furniture and Office Equipment | Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment, useful life   2 years      
Furniture and Office Equipment | Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Property and equipment, useful life   6 years