Acquisitions (Pro Forma Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2012	Dec. 30, 2011
Business Acquisition, Pro Forma Information [Abstract]
Sales	$ 646,617	$ 636,502
Net income	$ (4,973)	$ 32,306
Basic earnings per share	$ (0.21)	$ 1.39
Diluted earnings per share	$ (0.21)	$ 1.37