Business Combinations (Pro Forma Condensed Combined Financial Information) (Details) (Fiscal 2012 Acquisition [Member], Engenio External Storage Systems Business [Member], USD $) In Millions	3 Months Ended
Jul. 29, 2011	Jul. 30, 2010
Fiscal 2012 Acquisition [Member] \| Engenio External Storage Systems Business [Member]
Net revenues	$ 1,466.8	$ 1,322.7
Net income	$ 145.9	$ 138.4

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463

Name:	us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration