Stockholders' Equity (Number And Value Of The Shares Netted For Employee Taxes) (Details) (Restricted Stock Units [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Apr. 27, 2012	Apr. 29, 2011	Apr. 30, 2010
Restricted Stock Units [Member]
Shares withheld for taxes	1.2	1.0	0.7
Fair value of shares withheld and retired	$ 52.0	$ 45.9	$ 20.8

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

No definition available.

Name:	us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration