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Subsequent Events (Narrative) (Details) - $ / shares
3 Months Ended 9 Months Ended
Jun. 20, 2017
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Subsequent Events [Line Items]          
Cash dividend declared   $ 0.49 $ 0.42 $ 1.40 $ 1.22
Dividend payable, declared date       Jun. 20, 2017  
Dividends payable, date to be paid       Jul. 31, 2017  
Dividend payable, record date       Jul. 21, 2017  
Subsequent Events [Member]          
Subsequent Events [Line Items]          
Cash dividend declared $ 0.49