Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share	$ 0.19	$ 0.17	$ 0.38	$ 0.34