REVENUE RECOGNITION (Deferred Revenue) (Details) - POM - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Movement in Deferred Revenue [Roll Forward]
Balance, end of the period	$ 164,700
Deferred Revenue
Movement in Deferred Revenue [Roll Forward]
Balance, beginning of the period	183,685	$ 212,511
Amounts deferred	18,217	1,723
Amounts recognized on previous deferrals	(37,205)	(38,212)
Balance, end of the period	164,697	176,022
Deferred Wages
Movement in Deferred Revenue [Roll Forward]
Balance, beginning of the period	21,618	27,306
Amounts deferred	128	23
Amounts recognized on previous deferrals	(4,348)	(5,324)
Balance, end of the period	$ 17,398	$ 22,005