Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (14,146)	$ 4,465	$ 28,685
Other comprehensive income (loss):
Change in foreign currency translation adjustment	(818)	(264)	(484)
Employee benefit plan adjustment	151	(11)	(39)
Net change on unrealized gains (losses) on available-for-sale investments	7	(2)	0
Other comprehensive loss	(660)	(277)	(523)
Comprehensive income (loss)	$ (14,806)	$ 4,188	$ 28,162