Consolidated Statements of Stockholders' Equity Parenthetical - $ / shares shares in Thousands	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Cash dividends per common share	$ 0.82	$ 0.80	$ 0.78
Number of treasury stock shares acquired	109	40	304
Preferred Stock, Dividends, Per Share, Cash Paid	$ 14.50	$ 0	$ 0