Acquisition (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 11, 2015	Jun. 27, 2014	Mar. 28, 2014	Jul. 03, 2015	Jun. 27, 2014
Business Acquisition [Line Items]
Purchase price			$ 3,000
Shares granted to sellers			1,000
Contingent consideration			8,000
Compensation expense		$ 900			$ 1,700
Bargain purchase gain from acquisition					$ 3,015
Acquired intangible assets			$ 7,700
Minimum [Member]
Business Acquisition [Line Items]
Amortization period				2 years
Maximum [Member]
Business Acquisition [Line Items]
Amortization period				5 years
Subsequent Event [Member]
Business Acquisition [Line Items]
Compensation expense	$ 3,400