XML 101 R81.htm IDEA: XBRL DOCUMENT v3.8.0.1
Operating Segment and Geographic Information (Details 2) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Segment Reporting Information [Line Items]      
Identifiable assets $ 156,105 $ 150,761 $ 143,737
North America [Member]      
Segment Reporting Information [Line Items]      
Identifiable assets 156,105 150,761 143,737
Europe [Member]      
Segment Reporting Information [Line Items]      
Identifiable assets $ 0 $ 0 $ 0