CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Jan. 31, 2016	Jul. 31, 2015
Class A nonvoting common stock
Common stock, shares issued	51,261,487	51,261,487
Common stock, shares outstanding	46,705,559	47,781,184
Treasury stock, shares	4,555,928	3,480,303
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