Stockholders' Equity (Number and Value of the Shares Netted for Employee Taxes) (Details) (Restricted Stock Units [Member], USD $) In Millions	12 Months Ended
	Apr. 29, 2011	Apr. 30, 2010	Apr. 24, 2009
Restricted Stock Units [Member]
Shares withheld for taxes	1.0	0.7	0.3
Fair value of shares withheld	$ 45.9	$ 20.8	$ 5.1