Nature of Operations and Summary of Significant Accounting Policies (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Nature Of Operations and Summary Of Significant Accounting Policies [Line Items]
Rent income from real estate	$ 0	$ 158	$ 212
Other income (loss)	(169)	(37)	121
Other Income	$ (169)	$ 121	$ 333