Other Income (Expense), Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Other Income (Expense), Net
Interest income	$ 650	$ 318	$ 1,295	$ 1,015
Amortization of premium or discount on marketable debt securities	(251)	0	(271)	0
Gains on sale of marketable debt and equity securities, net	8	0	123	8,044
Gains on sale of non-marketable equity investments	0	5,379	0	8,108
Gains (losses) on securities in Cadence's NQDC	(839)	204	3,237	3,116
Gains (losses) on foreign exchange	1,376	1,259	2,546	(466)
Equity losses from non-marketable investments	(34)	(39)	(34)	(104)
Write-down of non-marketable investments	(1,081)	0	(1,103)	0
Other income, net	40	123	179	394
Total other income (expense), net	$ (131)	$ 7,244	$ 5,972	$ 20,107