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Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 26, 2020
USD ($)
shares
Sep. 28, 2019
USD ($)
shares
Sep. 26, 2020
USD ($)
segment
shares
Sep. 28, 2019
USD ($)
shares
Dec. 28, 2019
USD ($)
Dec. 29, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents $ 669,056 $ 513,360 $ 669,056 $ 513,360 $ 567,687  
Short-term investments $ 50,000   $ 50,000   120,000  
Maturity of Time Deposits     1 month      
Number of Sources of Product Revenue | segment     4      
Options to purchase of shares of common stock | shares 100 400 300 300    
Restricted cash $ 3,384 $ 152 $ 3,384 $ 152    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 672,440 $ 513,512 $ 672,440 $ 513,512 $ 568,075 $ 552,641
Intangible Assets    
Intangible Assets
Intangible assets consist primarily of patents, trademarks, software development costs, customer relationships and acquired technology. Costs related to patents and trademarks, which include legal and application fees, are capitalized and amortized over the estimated useful lives using the straight-line method. Patent and trademark amortization commences once final approval of the patent or trademark has been obtained. Patent costs are amortized over the lesser of 10 years or the patent’s remaining legal life, which assumes renewals, and trademark costs are amortized over 17 years, and their associated amortization cost is included in selling, general and administrative expense in the accompanying condensed consolidated statements of operations. For intangibles purchased in an asset acquisition or business combination, which mainly include patents, trademarks, customer relationships and acquired technologies, the useful life is determined in the same manner as noted above.
The Company’s policy is to renew its patents and trademarks. Costs to renew patents and trademarks are capitalized and amortized over the remaining useful life of the intangible asset. The Company periodically evaluates the amortization period and carrying basis of patents and trademarks to determine whether any events or circumstances warrant a revised estimated useful life or reduction in value. Capitalized application costs are charged to operations when it is determined that the patent or trademark will not be obtained or is abandoned.
      
Patents            
Summary Of Significant Accounting Policies [Line Items]            
Finite-Lived Intangible Asset, Useful Life     10 years      
Trademarks            
Summary Of Significant Accounting Policies [Line Items]            
Finite-Lived Intangible Asset, Useful Life     17 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     86      
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    
Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Warranty period for defects in material and workmanship     3 months      
Minimum | Aircraft and components            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     4 years      
Minimum | Building improvements            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     7 years      
Minimum | Computer equipment and software            
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]            
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 and software            
Summary Of Significant Accounting Policies [Line Items]            
Property, Plant and Equipment, Useful Life     12 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