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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Apr. 30, 2023
Jul. 31, 2022
Allowance for doubtful accounts receivable current $ 6,133 $ 5,882
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000 10,000
Preferred stock, shares issued 0 0
Common Class A [Member]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 35,000 35,000
Common stock, shares issued 3,272 3,272
Common stock, shares outstanding 1,574 1,574
Treasury stock shares 1,698 1,698
Common Class B [Member]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 200,000 200,000
Common stock, shares issued 27,798 27,725
Common stock, shares outstanding 23,892 24,112
Treasury stock shares 3,906 3,613