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Net Earnings Per Share (Schedule of Anti-dilutive Securities Excluded from Computation of Earnings Per Share) (Details) - shares
shares in Thousands
3 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Restricted Stock Units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from the computation of earnings per share 19 26
Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from the computation of earnings per share 0 35
Performance Stock Units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities excluded from the computation of earnings per share 20 0