Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Jul. 31, 2010	Jul. 31, 2009
Class A nonvoting common stock | Treasury Stock
Purchase of Class A Common Stock, Treasury Stock	102,067	1,344,664
Class A nonvoting common stock
Shares of Class A Common Stock	215,447	138,934
Purchase of Class A Common Stock, Treasury Stock	2,175,771
Common Stock, per share	$ 0.70	$ 0.68
Class B Common Stock
Common Stock, per share	$ 0.68	$ 0.66