Consolidated Statements of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Jan. 02, 2015	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Jan. 02, 2015	Dec. 27, 2013	Dec. 28, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share based compensation					$ 6,370	$ 6,119	$ 5,522
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share based compensation	1,029	842	999	686	3,556	3,284	2,990
Selling General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share based compensation	$ 656	$ 814	$ 691	$ 653	$ 2,814	$ 2,835	$ 2,524