Other Comprehensive Income (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Changes in unrealized holding gains or losses on available-for-sale securities
Unrealized holding gains or losses	$ (127)	$ (764)	$ 50
Tax effect of unrealized holding gains	0	0	2,882
Reclassification of unrealized holding gains or losses to other income, net	(53)	(141)	(8,072)
Changes in unrealized holding gains or losses	$ (180)	$ (905)	$ (5,140)