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Balance Sheet Account Details (Details 1) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Jan. 01, 2012
Available-for-sale securities gross unrealized loss position
Fair Value	$ 362,903	$ 272,230
Gross Unrealized Losses	(684)	(609)
Debt securities in government sponsored entities [Member]
Available-for-sale securities gross unrealized loss position
Fair Value	144,029	133,904
Gross Unrealized Losses	(216)	(148)
Corporate debt securities [Member]
Available-for-sale securities gross unrealized loss position
Fair Value	156,430	138,326
Gross Unrealized Losses	(378)	(461)
U.S. Treasury securities [Member]
Available-for-sale securities gross unrealized loss position
Fair Value	62,444	0
Gross Unrealized Losses	$ (90)	$ 0

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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