REVENUE RECOGNITION (Deferred Revenue) (Details) - POM - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Movement in Deferred Revenue [Roll Forward]
Balance, end of the period	$ 138,600
Deferred Revenue
Movement in Deferred Revenue [Roll Forward]
Balance, beginning of the period	183,685	$ 212,511
Amounts deferred	20,954	4,222
Amounts recognized on previous deferrals	(66,088)	(68,088)
Balance, end of the period	138,551	148,645
Deferred Wages
Movement in Deferred Revenue [Roll Forward]
Balance, beginning of the period	21,618	27,306
Amounts deferred	139	29
Amounts recognized on previous deferrals	(7,541)	(9,430)
Balance, end of the period	$ 14,216	$ 17,905