Fair Value Measurements (Fair value measurements on a nonrecurring basis) (Details) - Fair value, measurements, nonrecurring [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 29, 2020	Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment losses		$ 40,424	$ 3,482
Assets held for sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale, impairment		75	215
Operating lease right-of-use assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Operating lease assets, impairment		19,563	596
Operating lease right-of-use assets [Member] | Fair value, inputs, level 2 [Member] | Assets measured with impairment, year-to-date [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure			200
Operating lease right-of-use assets [Member] | Fair value, inputs, level 3 [Member] | Assets measured with impairment, year-to-date [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		55,600	2,000
Property, fixtures and equipment, net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, fixtures and equipment, impairment		18,398	2,671
Property, fixtures and equipment, net [Member] | Fair value, inputs, level 2 [Member] | Assets measured with impairment, year-to-date [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		2,500
Property, fixtures and equipment, net [Member] | Fair value, inputs, level 3 [Member] | Assets measured with impairment, year-to-date [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		19,200	500
Goodwill and other assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment losses		2,388	0
Carrying value measurement [Member] | Assets measured with impairment, year-to-date [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		79,563	4,881
Carrying value measurement [Member] | Assets held for sale [Member] | Fair value, inputs, level 2 [Member] | Assets measured with impairment, year-to-date [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	[1]	1,182	2,149
Carrying value measurement [Member] | Operating lease right-of-use assets [Member] | Assets measured with impairment, year-to-date [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	[2]	55,644	2,242
Carrying value measurement [Member] | Property, fixtures and equipment, net [Member] | Assets measured with impairment, year-to-date [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	[3]	21,693	490
Carrying value measurement [Member] | Goodwill and other assets [Member] | Fair value, inputs, level 2 [Member] | Assets measured with impairment, year-to-date [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	[4]	$ 1,044	$ 0

[1] Assets generally measured using third-party market appraisals or executed sales contracts (Level 2).

[2] Carrying values measured using Level 3 inputs to estimate fair value totaled $55.6 million and $2.0 million during the thirteen weeks ended March 29, 2020 and March 31, 2019, respectively. All other assets were valued using Level 2 inputs. Third-party market appraisals (Level 2) and discounted cash flow models (Level 3) were used to estimate fair value.

[3] Carrying values measured using Level 3 inputs to estimate fair value totaled $19.2 million and $0.5 million during the thirteen weeks ended March 29, 2020 and March 31, 2019, respectively. All other assets were valued using Level 2 inputs. Third-party market appraisals (Level 2) and discounted cash flow models (Level 3) were used to estimate fair value.

[4] All assets measured using the quoted market value of comparable assets (Level 2).