Operating Segment and Geographic Information (Details 1) - USD ($) $ in Thousands	3 Months Ended							4 Months Ended	12 Months Ended
	Dec. 30, 2017	Oct. 07, 2017	Mar. 25, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 09, 2016	Mar. 19, 2016	Jul. 15, 2017	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Segment Reporting Information [Line Items]
Net Sales	$ 48,685	$ 42,861	$ 31,866	$ 46,663	$ 39,657	$ 49,822	$ 35,520	$ 53,921	$ 177,333	$ 171,662	$ 159,463
North America [Member]
Segment Reporting Information [Line Items]
Net Sales									175,065	168,998	156,744
Europe [Member]
Segment Reporting Information [Line Items]
Net Sales									974	1,302	1,265
Other
Segment Reporting Information [Line Items]
Net Sales									$ 1,294	$ 1,362	$ 1,454