OTHER REVENUES (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Settlement gain			$ 1,318	$ 0	$ 1,318
Deferred revenue and other	$ 300	$ 86		389	174
Other Revenue, Net	$ 300	$ 86		$ 389	$ 1,492