Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical)

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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares
6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement of Stockholders' Equity [Abstract]    
Purchase of treasury stock, shares (in shares) 135,147 151,259
Issuance of treasury stock, shares (in shares) 215,058 287,681
Cancellations of treasury stock (in shares) 2,640 3,957
Dividends, per share (in dollars per share) $ 0.34 $ 0.30