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Earnings Per Share (Narrative) (Details) - shares
shares in Millions
3 Months Ended
Oct. 28, 2018
Oct. 29, 2017
Unvested Restricted Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from computation of earnings per share amount 0.3 0.4