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Cash, Cash Equivalents and Investments (Details 5) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Summary of realized gains from sale of marketable equity securities
Gains on sale of marketable debt and equity securities	$ 143	$ 8,052	$ 0
Amortization of premium or discount related marketable debt securities
Amortization of premium (discount)	$ (498)	$ 0	$ 0

This item represents the net amount of amortization of purchase discounts and premiums related to investments in debt securities. The purchase discount or premium is amortized to income or expense, respectively, over the life (holding period) of the securities to arrive at an amount of periodic interest income or expense which results in a constant effective yield on the investments.

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