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Earnings Per Share Earnings Per Share - Potential Common Shares Excluded in the Computation of Diluted Earnings Per Share Because They Would Have Been Antidilutive (Details)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
May 30, 2013
May 31, 2012
May 30, 2013
May 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive potential common shares that could dilute basic earnings per share in the future (in shares) 185.4 379.7 373.8 379.7