Additional Balance Sheet Information (Details 1) - USD ($) $ in Thousands	Dec. 27, 2018	Dec. 28, 2017
Property, Plant and Equipment, Gross	$ 1,394,912	$ 1,356,652
Less accumulated depreciation and amortization	554,869	496,588
Property and equipment, net	840,043	860,064
Land and improvements [Member]
Property, Plant and Equipment, Gross	150,122	146,887
Buildings and improvements [Member]
Property, Plant and Equipment, Gross	771,191	759,166
Leasehold improvements [Member]
Property, Plant and Equipment, Gross	98,885	93,451
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment, Gross	362,201	351,879
Construction in progress [Member]
Property, Plant and Equipment, Gross	$ 12,513	$ 5,269

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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