Acquisition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Mar. 28, 2014	Oct. 02, 2015	Sep. 26, 2014
Business Acquisition [Line Items]
Purchase price		$ 3,000
Shares granted to sellers		1,000
Contingent consideration		8,000
Compensation expense	$ 900			$ 2,600
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