Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Statement of Other Comprehensive Income [Abstract]
Net income	$ 58,584	$ 28,106	$ 126,074	$ 61,337
Other comprehensive income (loss), net of tax effects:
Foreign currency translation gain (loss)	1,025	26	(3,808)	5,631
Changes in unrealized holding gains or losses on available-for-sale securities, net of reclassification adjustment for realized gains and losses	(120)	(447)	(1,141)	(8,525)
Changes in defined benefit plan liabilities	65	23	120	36
Total other comprehensive income (loss), net of tax effects	970	(398)	(4,829)	(2,858)
Comprehensive income	$ 59,554	$ 27,708	$ 121,245	$ 58,479