Contingent Liabilities (Schedule Of Estimated Contingent Liability Payments) (Details) - USD ($) $ in Thousands	Oct. 31, 2016	Jul. 31, 2016	Oct. 31, 2015	Jul. 31, 2015
Contingent Liabilities [Abstract]
2017	$ 210
2018	70
Total estimated payments	280
Less imputed interest	(7)
Present value of contingent liabilities	$ 273	$ 391	$ 884	$ 1,116