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Summary of Significant Accounting Policies - Additional Information (Detail) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020 USD ($) shares	Jun. 29, 2019 USD ($) shares	Jun. 27, 2020 USD ($) segment shares	Jun. 29, 2019 USD ($) shares	Dec. 28, 2019 USD ($)	Dec. 29, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Fair value of common stock received for payment of stock option exercise price			$ 220
Settlement of promissory note in connection with acquisition option exercise			5,100
Cash and cash equivalents	$ 631,881	$ 408,784	631,881	$ 408,784	$ 567,687
Short-term investments	$ 50,000		$ 50,000		120,000
Maturity of Time Deposits			4 months
Number of Sources of Product Revenue | segment			4
Options to purchase of shares of common stock | shares	300	400	300
Restricted cash	$ 3,376	$ 155	$ 3,376	155
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 635,257	$ 408,939	$ 635,257	$ 408,939	$ 568,075	$ 552,641
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			79
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

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