Other Income, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Other Income (Expense), Net
Interest income	$ 1,706	$ 1,473	$ 1,303
Gains on sale of marketable debt and equity securities, net	1,364	141	8,009
Gains on sale of non-marketable equity investments	1,230	2,895	8,281
Gains (losses) on securities in Cadence's NQDC	3,293	4,453	(472)
Gains on foreign exchange	285	3,263	740
Write-down of non-marketable investments	(464)	(1,103)	0
Other income, net	156	219	213
Total other income, net	$ 7,570	$ 11,341	$ 18,074