The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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+ Details

Cash Equivalents and Investments (Details Textuals) (USD $)	3 Months Ended		9 Months Ended
	Oct. 02, 2011 Year Investment	Oct. 03, 2010	Oct. 02, 2011 Year Investment	Oct. 03, 2010	Dec. 31, 2010
Cash Equivalents and Investments (Textuals) [Abstract]
Carrying value of company's non-marketable equity securities	$ 43,900,000		$ 43,900,000		$ 39,900,000
Sales of non-marketable securities	0		0
Number of investments in an unrealized loss position	51		51
Pre-tax gain on sale of certain non-marketable securities		4,800,000		4,800,000
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Impairment charges for available-for-sale debt or equity securities	$ 0	$ 0	$ 0	$ 0