CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) In Thousands, unless otherwise specified	Oct. 31, 2012	Jul. 31, 2012
Class A nonvoting common stock [Member]
Common stock, shares Issued	51,261,487	51,261,487
Common stock, shares outstanding	47,563,704	47,630,926
Treasury stock, shares	3,387,783	3,245,561
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