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Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 396,268		$ 396,268		$ 332,654
Accumulated depreciation	(129,108)		(129,108)		(113,102)
Property and equipment, net	267,160		267,160		219,552
Depreciation	5,800	$ 4,800	16,000	$ 14,300
Building and building improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	122,111		122,111		101,731
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	67,826		67,826		58,864
Land
Property, Plant and Equipment [Line Items]
Total property and equipment	56,103		56,103		40,216
Aircraft and vehicles
Property, Plant and Equipment [Line Items]
Total property and equipment	32,853		32,853		29,934
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment	23,906		23,906		19,650
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	18,411		18,411		15,921
Tooling
Property, Plant and Equipment [Line Items]
Total property and equipment	18,038		18,038		15,346
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	13,288		13,288		11,049
Demonstration units
Property, Plant and Equipment [Line Items]
Total property and equipment	854		854		836
Construction-in-progress (CIP)
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 42,878		$ 42,878		$ 39,107

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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