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
9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]    
Purchase of treasury stock, shares (in shares) 174,032 1,130,875
Issuance of treasury stock, shares (in shares) 221,958 374,108
Cancellations of treasury stock (in shares) 2,640 5,237
Dividends, per share (in dollars per share) $ 0.51 $ 0.45