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Earnings Per Share and Dividends (Earnings Per Share) (Details 1) - shares
shares in Thousands
3 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Restricted Stock Awards [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common shares excluded from computation of diluted earnings per share 2,549 5,028
Stock Appreciation Rights [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Common shares excluded from computation of diluted earnings per share 0 1,406