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Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
shares
Jul. 01, 2017
USD ($)
shares
Jun. 30, 2018
USD ($)
segment
shares
Jul. 01, 2017
USD ($)
shares
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Accrued and other current liabilities $ 22,832,000   $ 22,832,000   $ 24,254,000  
Number of Sources of Product Revenue | segment     4      
Impairment of goodwill, intangible assets and other long-lived assets $ 0 $ 0        
Number of days royalty revenue is adjusted subsequent to quarter end     60 days      
Options to purchase of shares of common stock | shares 1,200 100 1,100 100    
Retained earnings $ 827,013,000   $ 827,013,000   737,955,000  
Deferred Tax Assets, Net         19,981,000  
Prepaid Taxes 4,245,000   4,245,000   3,493,000  
Royalty 9,100,000 $ 9,200,000 17,200,000 $ 17,400,000    
Patents            
Summary Of Significant Accounting Policies [Line Items]            
Finite-Lived Intangible Assets, Cost Incurred to Renew or Extend     $ 200,000 $ 300,000    
Weighted average number of years until the next renewal     1 year      
Trademarks            
Summary Of Significant Accounting Policies [Line Items]            
Weighted average number of years until the next renewal     6 years      
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      
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      
Buildings            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     39 years      
Land, Buildings and Improvements | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     7 years      
Land, Buildings and Improvements | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     15 years      
Computer equipment | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     2 years      
Computer equipment | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     6 years      
Vehicles            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     5 years      
Tooling            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     3 years      
Furniture and Office Equipment | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     2 years      
Furniture and Office Equipment | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     6 years      
Demonstration units            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     3 years      
Machinery and equipment | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     5 years      
Machinery and equipment | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     10 years      
Aircraft | Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     10 years      
Aircraft | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     20 years      
Restricted Stock Units (RSUs) [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares     7      
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares   2,700 2,700      
Accounting Standards Update 2016-16            
Summary Of Significant Accounting Policies [Line Items]            
Retained earnings 400,000   $ 400,000      
Deferred Tax Assets, Net 100,000   100,000      
Prepaid Taxes $ 500,000   $ 500,000      
Adjustments            
Summary Of Significant Accounting Policies [Line Items]            
Accrued and other current liabilities         18,090,000  
Retained earnings         17,113,000  
Deferred Tax Assets, Net         3,917,000  
Cumulative effect adjustment         17,100,000 $ 23,900,000
Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Accrued and other current liabilities         42,344,000  
Retained earnings         720,842,000  
Deferred Tax Assets, Net         $ 23,898,000