CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013
Class A nonvoting common stock [Member]
Common stock, shares issued	51,261,487	51,261,487
Common Stock Aggregate Liquidation Preference	$ 42,803	$ 42,803
Treasury stock, shares	3,477,291	2,626,276
Class B voting common stock [Member]
Common stock, shares issued	3,538,628	3,538,628
Common stock, shares outstanding	3,538,628	3,538,628