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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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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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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Balance Sheet Components (Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 01, 2021	Dec. 27, 2019	Jan. 01, 2021	Dec. 27, 2019	Jul. 03, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 79,104		$ 79,104		$ 82,627
Less: Accumulated depreciation and amortization	(65,653)		(65,653)		(65,716)
Total property, plant and equipment, net	13,451		13,451		16,911
Depreciation and amortization	1,407	$ 1,077	2,661	$ 2,115
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	210		210		710
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,849		6,849		11,737
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,208		21,208		17,887
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	50,837		50,837		52,293
Asset under construction
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 400		$ 400		$ 3,500