Balance Sheet Account Details (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 30, 2012
Available-for-sale securities:
Available for sale securities, Amortized Cost	$ 346,053	$ 914,883
Available for sale securities, Gross Unrealized Gains	345	1,543
Available for sale securities, Gross Unrealized Losses	(546)	(203)
Available for sale securities, estimated fair value	345,852	916,223
Debt securities in government sponsored entities [Member]
Available-for-sale securities:
Available for sale securities, Amortized Cost	56,905	314,638
Available for sale securities, Gross Unrealized Gains	14	251
Available for sale securities, Gross Unrealized Losses	(95)	(16)
Available for sale securities, estimated fair value	56,824	314,873
Corporate debt securities [Member]
Available-for-sale securities:
Available for sale securities, Amortized Cost	259,071	471,989
Available for sale securities, Gross Unrealized Gains	299	1,059
Available for sale securities, Gross Unrealized Losses	(447)	(187)
Available for sale securities, estimated fair value	258,923	472,861
U.S. Treasury securities [Member]
Available-for-sale securities:
Available for sale securities, Amortized Cost	30,077	128,256
Available for sale securities, Gross Unrealized Gains	32	233
Available for sale securities, Gross Unrealized Losses	(4)
Available for sale securities, estimated fair value	$ 30,105	$ 128,489

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References+ Details

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details