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Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2019
USD ($)
shares
Mar. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
shares
Jun. 29, 2019
USD ($)
segment
shares
Jun. 30, 2018
USD ($)
shares
Dec. 30, 2018
USD ($)
Dec. 29, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]              
Short-term investments $ 180,000,000.0     $ 180,000,000.0     $ 0
Impairment of goodwill, intangible assets and other long-lived assets       $ 0 $ 0    
Number of Sources of Product Revenue | segment       4      
Number of days royalty revenue is adjusted subsequent to quarter end       60 days      
Royalty $ 0.0   $ 9,100,000 $ 700,000 $ 17,200,000    
Options to purchase of shares of common stock | shares 400   1,200 300 1,100    
Cumulative Effect on Retained Earnings, Net of Tax, ROU Assets and Lease Liabilities           $ 22,500,000  
Cumulative Effect on Retained Earnings, Net of Tax, Lease Receivable           62,000,000.0  
Cumulative Effect on Retained Earnings, Net of Tax, Leased Equipment           103,500,000  
Cumulative Effect on Retained Earnings, Net of Tax, Deferred Tax Assets           8,600,000  
Cumulative Effect on Retained Earnings, Net of Tax, Deferred Tax Deferred Revenue and Contract-Related Liabilities           9,100,000  
Cumulative Effect on Retained Earnings, Net of Tax, Other Current Liabilities           $ 3,000,000.0  
Patents              
Summary Of Significant Accounting Policies [Line Items]              
Finite-Lived Intangible Assets, Cost Incurred to Renew or Extend       $ 400,000 $ 200,000    
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      
Buildings              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       39 years      
Demonstration units              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       3 years      
Tooling              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       3 years      
Vehicles              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       5 years      
Restricted Stock Units (RSUs)              
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       98      
Restricted Stock Units (RSUs) | Chief Executive Officer              
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 2016-02              
Summary Of Significant Accounting Policies [Line Items]              
Cumulative Effect on Retained Earnings, Tax, Adoption of ASU 2016-02   $ (26,795,000)          
Minimum              
Summary Of Significant Accounting Policies [Line Items]              
Maturity of Time Deposits 6 months            
Revenue, remaining performance obligation, expected timing of satisfaction, period 3 years     3 years      
Warranty period for defects in material and workmanship       6 months      
Minimum | Aircraft and components              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       10 years      
Minimum | Building improvements              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       7 years      
Minimum | Computer equipment              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       2 years      
Minimum | Furniture and office equipment              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       2 years      
Minimum | Machinery and equipment              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       5 years      
Maximum              
Summary Of Significant Accounting Policies [Line Items]              
Maturity of Time Deposits 1 year            
Revenue, remaining performance obligation, expected timing of satisfaction, period 6 years     6 years      
Warranty period for defects in material and workmanship       48 months      
Maximum | Aircraft and components              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       20 years      
Maximum | Building improvements              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       15 years      
Maximum | Computer equipment              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       6 years      
Maximum | Furniture and office equipment              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       6 years      
Maximum | Machinery and equipment              
Summary Of Significant Accounting Policies [Line Items]              
Property, Plant and Equipment, Useful Life       10 years      
Retained Earnings | Accounting Standards Update 2016-02              
Summary Of Significant Accounting Policies [Line Items]              
Cumulative Effect on Retained Earnings, Tax, Adoption of ASU 2016-02   $ (26,795,000)