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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	May 12, 2013	May 06, 2012	May 12, 2013	May 06, 2012
Income Taxes [Line Items]
Effective tax rates	34.80%	34.80%	31.40%	36.40%
Discrete income tax benefit			$ 72
Discrete tax expense				23
Special Cash Dividend
Income Taxes [Line Items]
Discrete income tax benefit			$ 62

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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- Definition

The component of income tax expense representing amounts paid or payable (or refundable) which are classified as "income taxes" as determined by applying the provisions of enacted tax law to other than the taxable Income or Loss from continuing operations for the period. Items affecting income taxes and required to be disclosed, but not included elsewhere, would also be designated as "Other".

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