Equity (Details)	12 Months Ended
	Jul. 31, 2013
Equity (Textual)
Common stock, conversion basis	Each share of Class A common stock may be converted into one share of Class B common stock, at any time, at the option of the holder. Shares of Class A common stock are subject to certain limitations on transferability that do not apply to shares of Class B common stock.
Description of distribution of earnings to stockholders	The Company's intention to distribute not less than 50% of its consolidated positive net earnings available for distribution to its stockholders.
Class A common stock [Member]
Equity (Textual)
Common stock, voting rights	Shares of Class A common stock are entitled to three votes per share.
Class B common stock [Member]
Equity (Textual)
Common stock, voting rights	Shares of Class B common stock are entitled to one-tenth of a vote per share.