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Contingent Liabilities (Schedule Of Estimated Contingent Liability Payments) (Details) - USD ($)
$ in Thousands
Jan. 31, 2017
Jul. 31, 2016
Jan. 31, 2016
Jul. 31, 2015
Contingent Liabilities [Abstract]        
2017 $ 140      
2018 633      
2019 750      
2020 188      
Total estimated payments 1,711      
Less imputed interest (85)      
Present value of contingent liabilities $ 1,626 $ 391 $ 694 $ 1,116