Derivatives (Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance) (Details) - USD ($) $ in Thousands		3 Months Ended
	Mar. 16, 2022	Mar. 26, 2022	Mar. 27, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges - interest rate swaps		$ 0	$ 38
Cash flow hedges - interest rate swaps		(210)	(187)
Net of tax, that had been deferred in AOCIL were reclassified into interest expense		177	123
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Payment to terminate the swap agreements	$ 73
Net of tax, that had been deferred in AOCIL were reclassified into interest expense	$ 177
Designated as Hedging Instrument | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges - interest rate swaps		0	38
Designated as Hedging Instrument | Interest Rate Swap | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges - interest rate swaps		(7)	34
Cash flow hedge gain (loss) to be reclassified during next 12 months, net		0
Not Designated as Hedging Instrument | Interest Rate Swap | Other Nonoperating Income (Expense)
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges - interest rate swaps		$ 210	$ 187