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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jul. 31, 2017
Jul. 31, 2016
Statement of Financial Position [Abstract]    
Trade receivables, allowances $ 750 $ 616
Inventories, reserves $ 1,518 $ 1,713
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 25,000,000 25,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 45,448,357 41,614,432
Exchangeable Shares, Shares, Issued 68,622 0
Treasury stock, shares 5,436,294 5,434,977