CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Oct. 31, 2017	Jul. 31, 2017
Class A nonvoting common stock
Common stock, shares issued	51,261,487	51,261,487
Common stock, shares outstanding	48,020,711	47,814,818
Treasury stock, shares	3,240,776	3,446,669
Class B Voting Common Stock
Common stock, shares issued	3,538,628	3,538,628
Common stock, shares outstanding	3,538,628	3,538,628