Financial Instruments (Details 4) (USD $) In Millions	Oct. 01, 2011	Apr. 02, 2011
Held-to-Maturity:
Held-to-maturity Securities, Short term	$ 15.0	$ 90.8
Held-to-maturity Securities, Noncurrent	1.5	12.7
Held-to-maturity Securities, Total	16.5	103.5
Available-for-Sale:
Available-for-sale Securities, Short term	90.9	46.8
Available-for-sale Securities, Noncurrent	92.3	70.9
Available-for-sale Securities, Total	183.2	117.7
Other:
Time deposits and other, Short term	372.0	456.3
Time deposits and other, Noncurrent	0	0
Time deposits and other, Total	372.0	456.3
Total:
Total Investments, Short-term	477.9	593.9
Total Investments, Noncurrent	93.8	83.6
Total Investments	571.7	677.5
Municipal Bonds [Member]
Held-to-Maturity:
Held-to-maturity Securities, Short term	15.0	90.8
Held-to-maturity Securities, Noncurrent	1.5	12.7
Held-to-maturity Securities, Total	16.5	103.5
Government and municipal bonds [Member]
Available-for-Sale:
Available-for-sale Securities, Short term	37.3	32.3
Available-for-sale Securities, Noncurrent	53.4	68.1
Available-for-sale Securities, Total	90.7	100.4
Corporate Bonds [Member]
Available-for-Sale:
Available-for-sale Securities, Short term	46.2	0
Available-for-sale Securities, Noncurrent	36.1	0
Available-for-sale Securities, Total	82.3	0
Other Securities [Member]
Available-for-Sale:
Available-for-sale Securities, Short term	0	0
Available-for-sale Securities, Noncurrent	0.4	0.5
Available-for-sale Securities, Total	0.4	0.5
Variable rate municipal securities [Member]
Available-for-Sale:
Available-for-sale Securities, Short term	7.4	14.5
Available-for-sale Securities, Noncurrent	0	0
Available-for-sale Securities, Total	7.4	14.5
Auction rate securities [Member]
Available-for-Sale:
Available-for-sale Securities, Short term	0	0
Available-for-sale Securities, Noncurrent	2.4	2.3
Available-for-sale Securities, Total	$ 2.4	$ 2.3

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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