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Cash Equivalents and Investments (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011	Dec. 31, 2011
Cash Equivalents And Investments (Textual) [Abstract]
Carrying value of the company's non-marketable equity securities		$ 41.6		$ 43.9
Gain Recognized from remeasurement of pre-acquisition equity interest to estimated fair value		$ 5.8
Number of investments in an unrealized loss position		94
Non Marketable Securities Fair Valued	0		0

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

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