Stockholders' Equity (Number And Value Of The Shares Netted For Employee Taxes) (Details) (Restricted Stock Units [Member], USD $) In Millions	3 Months Ended
	Jul. 29, 2011	Jul. 30, 2010
Restricted Stock Units [Member]
Shares withheld for taxes	0.5	0.5
Fair value of shares withheld	$ 25.3	$ 18.5