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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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