Annual report pursuant to Section 13 and 15(d)

Treasury Stock - Schedule of Treasury Stock Purchases (Details)

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Treasury Stock - Schedule of Treasury Stock Purchases (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Stockholders' Equity Note [Abstract]      
Total Number of Shares Purchased (in shares) 78,446 91,554 118,792
Average Price Paid Per Share (in dollars per share) $ 40.04 $ 43.83 $ 40.78
Total Shares Purchased as Part of Publicly Announced Plan or Program (in shares) 545,995 467,549 375,995
Total Dollar Value of Shares Purchased $ 3,141 $ 4,013 $ 4,844