CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2021	Jul. 31, 2020
Accounts Receivable, Allowance for Credit Loss, Current	$ 7,306	$ 7,157
Class A Nonvoting Common Stock
Common stock, shares issued	51,261,487	51,261,487
Common stock, shares outstanding	48,528,245	48,456,954
Treasury stock, shares	2,733,242	2,804,533
Common Stock Aggregate Liquidation Preference	$ 42,716	$ 42,716
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