Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 27, 2016	Dec. 29, 2015
Consolidated Balance Sheets [Abstract]
Property and equipment, accumulated depreciation	$ 88,190	$ 70,759
Preferred stock, par value per share	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share	$ 0.001	$ 0.001
Common stock, shares authorized	190,000,000	190,000,000
Common stock, shares issued	24,234,909	23,967,692
Common stock, shares outstanding	23,272,274	23,313,169
Treasury stock, shares	962,635	654,523