Stockholders' Equity (Stock-Based Compensation Expense Associated With Each Type Of Award) (Details) (USD $) In Millions	3 Months Ended
Jul. 29, 2011	Jul. 30, 2010
Total stock-based compensation expense	$ 58.1	$ 44.3
Stock Options [Member]
Total stock-based compensation expense	14.5	12.9
Employee Stock Purchase Plan [Member]
Total stock-based compensation expense	9.2	11.6
Restricted Stock Units And Restricted Stock Awards [Member]
Total stock-based compensation expense	$ 34.4	$ 19.8

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration