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OTHER REVENUES (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
OTHER REVENUES (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018	Jul. 31, 2017	Jan. 31, 2019	Jan. 31, 2018
Amortization of deferred revenue and other	$ 48	$ 193		$ 437	$ 367
Settlement gain			$ 1,318	0	1,318
Other Revenue, Net	$ 48	$ 193		$ 437	$ 1,685