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Equipment, Leasehold Improvements and Software - Components of Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018	Dec. 28, 2018
Property, Plant and Equipment [Line Items]
Depreciation expense, various assets			$ 9,539	$ 7,234
Equipment and vehicles financed by leases	$ 90,531		90,531		$ 85,276
Excluding assets held under finance leases
Property, Plant and Equipment [Line Items]
Depreciation expense, various assets	2,473		6,595
Excluding assets held under capital leases
Property, Plant and Equipment [Line Items]
Depreciation expense, various assets		$ 1,710		5,245
Software
Property, Plant and Equipment [Line Items]
Depreciation expense, various assets	926	$ 1,008	2,746	$ 1,941
Assets held under finance leases
Property, Plant and Equipment [Line Items]
Equipment and vehicles financed by leases	$ 1,633		$ 1,633
Assets held under capital leases
Property, Plant and Equipment [Line Items]
Assets financed by capital lease					$ 52

X

- Definition

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