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Stockholders Equity - Income Tax Benefits Associated with Employee Stock Transactions (Detail) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |
|---|---|---|
|
Oct. 26, 2012
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Oct. 28, 2011
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| Deferred Income Taxes And Tax Credits [Line Items] | ||
| Income tax benefit associated with employee stock transactions | $ 28.2 | $ 79.1 |