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Stockholders' Equity (Number And Value Of The Shares Netted For Employee Taxes) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Jan. 27, 2012
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Jan. 28, 2011
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Jan. 27, 2012
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Jan. 28, 2011
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| Stockholders' Equity [Abstract] | ||||
| Shares withheld for taxes | 0.4 | 0.3 | 1.0 | 0.8 |
| Fair value of shares withheld and retired | $ 16.4 | $ 15.9 | $ 44.2 | $ 35.5 |