Summary of Significant Accounting Policies (Property and Depreciation) (Details)	12 Months Ended
	Dec. 25, 2019
Building Assets | Minimum
Property, Plant and Equipment
Property and equipment, useful life	5 years
Building Assets | Maximum
Property, Plant and Equipment
Property and equipment, useful life	30 years
Equipment | Minimum
Property, Plant and Equipment
Property and equipment, useful life	2 years
Equipment | Maximum
Property, Plant and Equipment
Property and equipment, useful life	10 years
Leasehold Improvements | Minimum
Property, Plant and Equipment
Property and equipment, useful life	5 years
Leasehold Improvements | Maximum
Property, Plant and Equipment
Property and equipment, useful life	15 years