CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)	Oct. 31, 2013	Jul. 31, 2013
Class A nonvoting common stock [Member]
Common stock, shares issued	51,261,487	51,261,487
Common stock, shares outstanding	48,594,617	48,408,544
Treasury stock, shares	2,435,203	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