Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended								12 Months Ended
	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Dividends, per share	$ 0.130	$ 0.130	$ 0.100	$ 0.090	$ 0.090	$ 0.090	$ 0.080	$ 0.075	$ 0.450	$ 0.335	$ 0.280