CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2021	Jul. 31, 2021	Oct. 31, 2020
Accounts Receivable, Allowance for Credit Loss, Current	$ 7,265	$ 7,306
Common stock, shares issued	51,261,487
Class A nonvoting common stock
Common stock, shares issued	51,261,487	51,261,487
Common stock, shares outstanding	48,257,592	48,528,245
Treasury stock, shares	3,003,895	2,733,242	3,003,895
Class B Voting Common Stock
Common stock, shares issued	3,538,628	3,538,628
Common stock, shares outstanding	3,538,628