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Income Taxes - Effective Tax Rates (Detail)	9 Months Ended
Income Taxes - Effective Tax Rates (Detail)	Jan. 25, 2013	Jan. 27, 2012
Schedule Of Effective Tax Rates [Line Items]
Effective tax rates	12.20%	14.70%

- 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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