Derivatives (Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance) (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
		Mar. 16, 2022	Sep. 24, 2022	Sep. 25, 2021	Sep. 24, 2022	Sep. 25, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges - interest rate swaps			$ 0	$ (3)	$ 0	$ 40
Cash flow hedges - interest rate swaps	[1]		0	0	(210)	0
Net of tax, that had been deferred in AOCIL were reclassified into interest expense			0	0	177	0
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	(3)	0	40
Designated as Hedging Instrument | Interest Rate Swap | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges - interest rate swaps			0	33	(7)	102
Cash flow hedge gain (loss) to be reclassified during next 12 months, net			0		0
Designated as Hedging Instrument | Interest Rate Swap | Other Nonoperating Income (Expense)
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges - interest rate swaps			$ 0	$ 136	$ 210	$ 509

[1] Amounts for postretirement plans reclassified from accumulated other comprehensive income (loss) to net loss were included in selling and administrative expenses in the Company's Consolidated Condensed Statements of Operations.