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Dividends and Share Repurchases (Details) - $ / shares
3 Months Ended 9 Months Ended
Jul. 25, 2016
May 13, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dividends Payable [Line Items]            
Cash dividends per share (in dollars per share)   $ 0.14 $ 0.14 $ 0.13 $ 0.41 $ 0.41
Stock repurchased (in shares)     1,097,397 1,171,662    
Average cost per share (in dollars per share)     $ 23.33 $ 21.93    
Remaining shares authorized to be repurchased (in shares)     1,041,309   1,041,309  
Subsequent Event            
Dividends Payable [Line Items]            
Dividends declared (in dollars per share) $ 0.14