Operating Results Historically Included Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2015	Jun. 27, 2014	Jul. 03, 2015	Jun. 27, 2014
Discontinued Operations And Disposal Groups [Abstract]
Revenue from discontinued operations		$ 6,271		$ 10,287
Operating loss from discontinued operations, before income tax	$ (13)	(2,136)	$ (13)	(4,987)
Operating loss from discontinued operations, net of tax	$ (13)	$ (2,678)	$ (13)	$ (4,544)