Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Apr. 02, 2011
Available-for-sale securities
Amortized Cost	$ 3,048,860	$ 2,598,791
Gross Unrealized Gains	19,590	9,496
Gross Unrealized Losses	(5,412)	(4,944)
Estimated Fair Value	3,063,038	2,603,343
Money Market Funds [Member]
Available-for-sale securities
Amortized Cost	232,017	275,596
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value	232,017	275,596
Bank Certificates of Deposit [Member]
Available-for-sale securities
Amortized Cost	159,972	89,984
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value	159,972	89,984
Commercial Paper [Member]
Available-for-sale securities
Amortized Cost	594,867	710,210
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value	594,867	710,211
Corporate Bonds [Member]
Available-for-sale securities
Amortized Cost	186,455	25,501
Gross Unrealized Gains	3,401	69
Gross Unrealized Losses	(184)	(4)
Estimated Fair Value	189,672	25,566
Auction Rate Securities [Member]
Available-for-sale securities
Amortized Cost	32,600	38,250
Gross Unrealized Gains
Gross Unrealized Losses	(3,671)	(3,300)
Estimated Fair Value	28,929	34,950
Municipal Bonds [Member]
Available-for-sale securities
Amortized Cost	25,454	16,818
Gross Unrealized Gains	734	192
Gross Unrealized Losses	(28)	(52)
Estimated Fair Value	26,160	16,958
U.S. Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	668,702	206,052
Gross Unrealized Gains	360	38
Gross Unrealized Losses	(149)	(207)
Estimated Fair Value	668,913	205,883
Foreign Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	249,951	546,407
Gross Unrealized Gains		7
Gross Unrealized Losses		(16)
Estimated Fair Value	249,951	546,398
Floating Rate Notes [Member]
Available-for-sale securities
Amortized Cost		91,927
Gross Unrealized Gains		204
Gross Unrealized Losses		(1)
Estimated Fair Value		92,130
Mortgage-Backed Securities [Member]
Available-for-sale securities
Amortized Cost	878,842	598,046
Gross Unrealized Gains	15,094	8,984
Gross Unrealized Losses	(1,160)	(1,363)
Estimated Fair Value	892,776	605,667
Debt Mutual Fund [Member]
Available-for-sale securities
Amortized Cost	20,000
Gross Unrealized Gains
Gross Unrealized Losses	(219)
Estimated Fair Value	$ 19,781

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-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 FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15E

-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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-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 FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15D

-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)

-Number 115

-Paragraph 13

-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 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15C

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 14

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

-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 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558

+ Details

- Definition

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

- 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