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Earnings Per Share (Narrative) (Details)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jan. 27, 2013
Jan. 29, 2012
Jan. 27, 2013
Jan. 29, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock options not included in the diluted earnings per share calculation as they were antidilutive 0 0 0 0