Fair Value Measurements (Fair value inputs on a nonrecurring basis) (Details) - Operating lease right-of-use-asset and property, fixtures and equipment [Member] - Fair value, measurements, nonrecurring [Member] - Fair value, inputs, level 3 [Member]	3 Months Ended
	Mar. 29, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value inputs, weighted-average cost of capital	10.40%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value inputs, long-term growth rate	1.50%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value inputs, long-term growth rate	2.00%