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