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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands, shares in Millions
 12 Months Ended
Nov. 05, 2016
USD ($)
Dec. 29, 2018
USD ($)
segment
shares
Dec. 30, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Summary Of Significant Accounting Policies [Line Items]        
Depreciation   $ 16,300 $ 15,200 $ 13,000
Accumulated amortization   27,234 24,675  
Cost of patents, Gross   5,300 4,300  
Cost of trademarks, Gross   500 600  
Capitalized Software Development Costs for Software Sold to Customers   $ 700 200 0
Product life estimate   7 years    
Capitalized Computer Software, Amortization   $ 2,000 1,900 1,800
Unamortized cost by company   $ 1,400 800  
Number of Sources of Product Revenue | segment   4    
Royalty Revenue, Number of Days Royalty Revenue is Adjusted Subsequent to Quarter End   60 days    
Other Recurring Income   $ 2,000 19,200 8,200
Advertising costs   $ 17,900 $ 17,800 $ 14,300
Options to purchase of shares of common stock | shares   1.1 0.4 0.2
Number of reportable segments | segment   1    
Retained earnings   $ 931,073 $ 737,956  
Deferred Tax Assets, Net   18,254 10,101  
Prepaid income taxes   $ 3,071 3,494  
As Previously Reported        
Summary Of Significant Accounting Policies [Line Items]        
Retained earnings     720,842  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Retained earnings     17,114  
Cumulative Effect of New Accounting Principle in Period of Adoption     17,100 $ 23,900
Patents        
Summary Of Significant Accounting Policies [Line Items]        
Estimated life maximum   10 years    
Accumulated amortization   $ 8,868 8,473  
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   $ 1,889 1,611  
Weighted average number of years until the next renewal   5 years    
Patents and trademarks        
Summary Of Significant Accounting Policies [Line Items]        
Accumulated amortization   $ 4,800 4,900 $ 3,800
Total renewal costs capitalized   $ 500 600  
Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period   3 years    
Warranty period for defects in material and workmanship   6 months    
Operating Lease, Right-of-Use Asset   $ 19,000    
Retained Earnings, Cumulative Effect, Full Retrospective Method   $ 16,000    
Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period   6 years    
Warranty period for defects in material and workmanship   48 months    
Operating Lease, Right-of-Use Asset   $ 24,000    
Retained Earnings, Cumulative Effect, Full Retrospective Method   $ 26,000    
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      
Collaborative Arrangement, Rights and Obligations     30,000  
Air Transportation Equipment | Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Property and equipment, useful life   10 years    
Air Transportation Equipment | Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Property and equipment, useful life   20 years    
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   10 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    
Accounting Standards Update 2016-16 [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Retained earnings     400  
Deferred Tax Assets, Net     100  
Prepaid income taxes     $ 500