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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Jul. 31, 2018
Jul. 31, 2017
Allowance for doubtful accounts $ 3,166 $ 2,657
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, authorized shares 10,000 10,000
Preferred stock, shares issued
Class A Common Stock    
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, common stock shares 1,698 1,698
Class B Common Stock    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 200,000 200,000
Common stock, shares issued 25,594 25,561
Common stock, shares outstanding 22,872 23,264
Treasury stock, common stock shares 2,722 2,297