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Subsequent Events (Narrative) (Details) - $ / shares
3 Months Ended 6 Months Ended
Mar. 22, 2016
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Subsequent Events [Line Items]          
Cash dividend declared   $ 0.42 $ 0.38 $ 0.80 $ 0.72
Dividend payable, declared date       Mar. 22, 2016  
Dividends payable, date to be paid       Apr. 29, 2016  
Dividend payable, record date       Apr. 15, 2016  
Subsequent Events [Member]          
Subsequent Events [Line Items]          
Cash dividend declared $ 0.42