Consolidated Statements of Stockholders' Equity (Parenthetical) - Retained Earnings - $ / shares	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Special dividends, per common share		$ 1.00	$ 1.50
Cash dividends, per common share	$ 1.08	$ 0.92	$ 0.72