Restructuring - Textual (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended	21 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014	Dec. 27, 2014	Sep. 26, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 0	$ 1,715	$ 56	$ 1,715	$ 2,300
Employee severance and benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge			45	560		$ 1,100
Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge			11	309		400
Facility termination costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge			$ 0	$ 846		$ 900