CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]
Purchase of treasury stock, shares (in shares)	1,132,452	304,859	228,789
Issuance of treasury stock, shares (in shares)	404,307	334,850	5,936,169
Cancellation of treasury stock, shares (in shares)	5,237	34,789	77,597
Dividends, per share (in dollars per share)		$ 0.54	$ 0.46