Fair Value Measurements (Fair Value Measurements - Carrying Amount and Fair Value) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021
Financial liabilities:
Finance leases, including current portion	$ 12,660	$ 13,787
Interest rate swaps	$ 0	$ 210
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed	Interest rate swaps	Interest rate swaps
Carrying Amount
Financial assets:
Cash and cash equivalents	$ 363	$ 1,471
Financial liabilities:
Long-term debt, including current portion	86,638	63,275
Finance leases, including current portion	12,660	13,787
Interest rate swaps	0	210
Fair Value
Financial assets:
Cash and cash equivalents	363	1,471
Financial liabilities:
Long-term debt, including current portion	76,684	61,721
Finance leases, including current portion	11,576	16,389
Interest rate swaps	$ 0	$ 210