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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jul. 31, 2021
Jul. 31, 2020
Accounts Receivable, Allowance for Credit Loss, Current $ 4,438 $ 6,085
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Common Class A [Member]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 35,000,000 35,000,000
Common stock, shares issued 3,272,000 3,272,000
Common stock, shares outstanding 1,574,000 1,574,000
Treasury Stock, Shares 1,698,000 1,698,000
Common Class B [Member]    
Common stock, par value   $ 0.01
Common stock, shares authorized   200,000,000
Common stock, shares issued 26,379,000 25,961,000
Common stock, shares outstanding 24,187,000 24,345,000
Treasury Stock, Shares 2,192,000 1,616,000