Financing Arrangements (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Oct. 28, 2012	Oct. 26, 2011	Apr. 29, 2012
Transfers and Servicing [Abstract]
Amount of accounts receivable securitization program	$ 175
Initial cash funding under receivable securitization program	114.4	127.8
Increase (Decrease) in Accounts Receivable from Securitization	(47.4)	98.8
Fair value of deferred purchase price	105.6		56.8
Increase (Decrease) in Interests Continued to be Held by Transferor, Current	(48.8)	100.9
Trade receivables sold without recourse	$ 199		$ 206

The increase (decrease) during the reporting period in the value of the assets created and retained during the securitization of trade receivables, which are not otherwise defined in the taxonomy.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Name:	us-gaap_IncreaseDecreaseInInterestsContinuedToBeHeldByTransferorCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration