Investments and Fair Value Measurements (Details 4) (USD $) In Thousands, unless otherwise specified	Jan. 01, 2012	Jan. 02, 2011
Available-for-sale investments
Amortized Cost	$ 4,510,308	$ 4,518,895
Gross Unrealized Gain	22,322	34,242
Gross Unrealized Loss	(5,270)	(13,875)
Fair Value, Total	4,527,360	4,539,262
Debt Securities [Member]
Available-for-sale investments
Amortized Cost	4,510,308	4,450,370
Gross Unrealized Gain	22,322	12,342
Gross Unrealized Loss	(5,270)	(13,875)
Fair Value	4,527,360	4,448,837
U.S. Treasury and government agency securities [Member]
Available-for-sale investments
Amortized Cost	219,366	36,015
Gross Unrealized Gain	69	53
Gross Unrealized Loss	(4)	(33)
Fair Value	219,431	36,035
U.S. Government-sponsored agency securities [Member]
Available-for-sale investments
Amortized Cost	97,087	24,336
Gross Unrealized Gain	10	85
Gross Unrealized Loss	(26)	0
Fair Value	97,071	24,421
Corporate notes and bonds [Member]
Available-for-sale investments
Amortized Cost	780,650	401,182
Gross Unrealized Gain	1,707	2,689
Gross Unrealized Loss	(3,889)	(196)
Fair Value	778,468	403,675
Asset-backed securities [Member]
Available-for-sale investments
Amortized Cost	180,828	10,069
Gross Unrealized Gain	61	45
Gross Unrealized Loss	(149)	(5)
Fair Value	180,740	10,109
Mortgage-backed securities [Member]
Available-for-sale investments
Amortized Cost	1,137	6,500
Gross Unrealized Gain	5	35
Gross Unrealized Loss	0	0
Fair Value	1,142	6,535
Municipal notes and bonds [Member]
Available-for-sale investments
Amortized Cost	3,231,240	3,972,268
Gross Unrealized Gain	20,470	9,435
Gross Unrealized Loss	(1,202)	(13,641)
Fair Value	3,250,508	3,968,062
Equity Investments [Member]
Available-for-sale investments
Amortized Cost	0	68,525
Gross Unrealized Gain	0	21,900
Gross Unrealized Loss	0	0
Fair Value	$ 0	$ 90,425

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

For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

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Reference 4: 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

For an unclassified balance sheet, this item represents equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 3

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Name Statement of Financial Accounting Standard (FAS)

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-Publisher FASB

-Name Emerging Issues Task Force (EITF)

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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.

+ 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