Revenue from Contracts with Customers (Details 1) - USD ($) $ in Thousands	4 Months Ended		6 Months Ended
	Jul. 14, 2018	Jul. 15, 2017	Jul. 14, 2018	Jul. 15, 2017
Increase due to cash received, excluding amounts recognized as revenue during the period	$ 930	$ 0	$ 930	$ 0
Revenue recognized that was included in the contract liability balance at the beginning of the period	0	0	0	0
Increase in contract liability during the period	$ 930	$ 0	$ 930	$ 0