CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Jan. 31, 2017	Jul. 31, 2016
Class A nonvoting common stock
Common stock, shares issued	51,261,487	51,261,487
Common stock, shares outstanding	47,594,684	46,920,974
Treasury stock, shares	3,666,803	4,340,513
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