Revenue (Contract Balances) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020
Revenue from Contract with Customer [Abstract]
Beginning contract liability	$ 1,005	$ 920
Revenue recognized from contract liabilities included in the beginning balance	(927)	(883)
Increases due to cash received, net of amounts recognized in revenue during the period	1,207	968
Ending contract liability	$ 1,285	$ 1,005