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Subsequent Events (Narrative) (Details) - $ / shares
3 Months Ended
Dec. 12, 2017
Nov. 30, 2017
Nov. 30, 2016
Subsequent Events [Line Items]      
Cash dividend declared   $ 0.49 $ 0.42
Dividend payable, declared date   Dec. 12, 2017  
Dividends payable, date to be paid   Jan. 31, 2018  
Dividend payable, record date   Jan. 19, 2018  
Subsequent Events [Member]      
Subsequent Events [Line Items]      
Percentage increase in quarterly cash dividend 10.00%    
Cash dividend declared $ 0.54