Contingent Liabilities (Schedule Of Estimated Contingent Liability Payments) (Details) - USD ($) $ in Thousands	Apr. 30, 2016	Jul. 31, 2015	Apr. 30, 2015	Jul. 31, 2014
Contingent Liabilities [Abstract]
2016	$ 121
2017	331
2018	70
Total estimated payments	522
Less imputed interest	(16)
Present value of contingent liabilities	$ 506	$ 1,116	$ 1,104	$ 448