CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jan. 31, 2022	Jul. 31, 2021
Accounts Receivable, Allowance for Credit Loss, Current	$ 7,868	$ 7,306
Class A Nonvoting Common Stock [Member]
Common stock, shares issued	51,261,487	51,261,487
Common stock, shares outstanding	48,243,347	48,528,245
Treasury stock, shares	3,018,140	2,733,242
Class B Voting Common Stock [Member]
Common stock, shares issued	3,538,628	3,538,628
Common stock, shares outstanding	3,538,628	3,538,628