Financial Instruments (Details) (USD $) In Thousands	Oct. 01, 2011	Apr. 02, 2011
Available-for-sale securities
Amortized Cost	$ 2,780,706	$ 2,598,791
Gross Unrealized Gains	16,529	9,496
Gross Unrealized Losses	(6,012)	(4,944)
Estimated Fair Value	2,791,223	2,603,343
Money Market Funds [Member]
Available-for-sale securities
Amortized Cost	222,364	275,596
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	222,364	275,596
Bank Certificates of Deposit [Member]
Available-for-sale securities
Amortized Cost	147,784	89,984
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	147,784	89,984
Commercial Paper [Member]
Available-for-sale securities
Amortized Cost	654,132	710,210
Gross Unrealized Gains	1	2
Gross Unrealized Losses	0	(1)
Estimated Fair Value	654,133	710,211
Corporate Bonds [Member]
Available-for-sale securities
Amortized Cost	193,538	25,501
Gross Unrealized Gains	1,667	69
Gross Unrealized Losses	(570)	(4)
Estimated Fair Value	194,635	25,566
Auction Rate Securities [Member]
Available-for-sale securities
Amortized Cost	32,900	38,250
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,852)	(3,300)
Estimated Fair Value	29,048	34,950
Municipal Bonds [Member]
Available-for-sale securities
Amortized Cost	25,138	16,818
Gross Unrealized Gains	1,047	192
Gross Unrealized Losses	(15)	(52)
Estimated Fair Value	26,170	16,958
U.S. Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	146,037	206,052
Gross Unrealized Gains	358	38
Gross Unrealized Losses	(45)	(207)
Estimated Fair Value	146,350	205,883
Foreign Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	599,818	546,407
Gross Unrealized Gains	27	7
Gross Unrealized Losses	(8)	(16)
Estimated Fair Value	599,837	546,398
Floating Rate Notes [Member]
Available-for-sale securities
Amortized Cost	0	91,927
Gross Unrealized Gains	0	204
Gross Unrealized Losses	0	(1)
Estimated Fair Value	0	92,130
Mortgage-Backed Securities [Member]
Available-for-sale securities
Amortized Cost	758,995	598,046
Gross Unrealized Gains	13,429	8,984
Gross Unrealized Losses	(1,522)	(1,363)
Estimated Fair Value	$ 770,902	$ 605,667

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