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Income Taxes - Effective Tax Rates (Detail)	3 Months Ended
Income Taxes - Effective Tax Rates (Detail)	Jul. 27, 2012	Jul. 29, 2011
Schedule Of Effective Tax Rates [Line Items]
Effective tax rates	14.00%	16.50%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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