Financial Instruments (Details 3) (USD $) In Millions, unless otherwise specified	Mar. 30, 2013	Mar. 31, 2012
Held-to-Maturity:
Held-to-maturity Securities, Short term	$ 0	$ 3.2
Held-to-maturity Securities, Noncurrent	0	0
Held-to-maturity Securities, Total	0	3.2
Available-for-Sale:
Available-for-sale Securities, Current	140.7	226.5
Available-for-sale Securities, Noncurrent	81.0	99.9
Available-for-sale Other Securities, Total	221.7	326.4
Other:
Time deposits, Short term	184.0	286.0
Time deposits, Noncurrent	0	0
Time deposits, Total	184.0	286.0
Total:
Total Investments, Short-term	324.7	515.7
Total Investments, Noncurrent	81.0	99.9
Total Investments	405.7	615.6
Government bonds - U.S. [Member]
Available-for-Sale:
Available-for-sale Debt Securities, Short term	21.1	52.1
Available-for-sale Securities, Debt Securities, Noncurrent	7.7	7.3
Available-for-sale Debt Securities, Total	28.8	59.4
Government bonds - non-U.S. [Member]
Available-for-Sale:
Available-for-sale Debt Securities, Short term	67.0	40.4
Available-for-sale Securities, Debt Securities, Noncurrent	25.4	55.6
Available-for-sale Debt Securities, Total	92.4	96.0
Corporate Bonds - non-U.S. [Member]
Available-for-Sale:
Available-for-sale Debt Securities, Short term	36.0	64.8
Available-for-sale Securities, Debt Securities, Noncurrent	45.6	34.2
Available-for-sale Debt Securities, Total	81.6	99.0
Variable rate municipal securities - U.S. [Member]
Available-for-Sale:
Available-for-sale Debt Securities, Short term	16.6	69.2
Available-for-sale Securities, Debt Securities, Noncurrent	0	0
Available-for-sale Debt Securities, Total	16.6	69.2
Auction rate securities [Member]
Available-for-Sale:
Available-for-sale Debt Securities, Short term	0	0
Available-for-sale Securities, Debt Securities, Noncurrent	2.3	2.3
Available-for-sale Debt Securities, Total	2.3	2.3
Other Securities [Member]
Available-for-Sale:
Available-for-sale Securities, Current	0	0
Available-for-sale Securities, Noncurrent	0	0.5
Available-for-sale Other Securities, Total	0	0.5
Government bonds - U.S. [Member]
Held-to-Maturity:
Held-to-maturity Securities, Short term	0	3.2
Held-to-maturity Securities, Noncurrent	0	0
Held-to-maturity Securities, Total	$ 0	$ 3.2

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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 Accounting Standards Codification

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

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Reference 8: 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 9: 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 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-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.