Derivatives And Hedging Activities (Schedule Of Notional Value Of Outstanding Foreign Currency Forward Contracts) (Details) (USD $) In Millions, unless otherwise specified	Apr. 27, 2012	Apr. 29, 2011
Euro [Member]
Derivative [Line Items]
Cash Flow Hedges	$ 96.9	$ 104.0
Balance Sheet Contracts	267.4	253.7
British Pound Sterling [Member]
Derivative [Line Items]
Cash Flow Hedges	29.8	20.9
Balance Sheet Contracts	86.4	70.8
Australian Dollar [Member]
Derivative [Line Items]
Balance Sheet Contracts	54.3	34.4
Canadian Dollar [Member]
Derivative [Line Items]
Balance Sheet Contracts	38.5	56.0
Other [Member]
Derivative [Line Items]
Balance Sheet Contracts	$ 68.5	$ 52.6

Aggregate notional amount of all foreign currency derivatives not designated as hedging instruments. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

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