Other Income, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Other Income (Expense), Net
Interest income	$ 1,473	$ 1,303	$ 1,201
Gains on sale of marketable debt and equity securities, net	141	8,009	109
Gains on sale of non-marketable equity investments	2,895	8,281	4,885
Loss on early extinguishment of debt	0	0	(5,705)
Gains (losses) on securities in Cadence's NQDC	4,453	(472)	2,623
Gains on foreign exchange	3,263	740	449
Equity losses from non-marketable investments	(65)	(136)	(133)
Write-down of non-marketable investments	(1,103)	0	(1,500)
Other income, net	219	213	479
Total other income, net	$ 11,341	$ 18,074	$ 2,541