REVENUE RECOGNITION (Deferred Revenue) (Details) - POM - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Movement in Deferred Revenue [Roll Forward]
Balance, end of the period	$ 153,300
Deferred Revenue
Movement in Deferred Revenue [Roll Forward]
Balance, beginning of the period	212,511	$ 218,274
Amounts deferred	28,686	27,711
Amounts recognized on previous deferrals	(87,850)	(90,439)
Balance, end of the period	153,347	155,546
Deferred Wages
Movement in Deferred Revenue [Roll Forward]
Balance, beginning of the period	27,306	32,683
Amounts deferred	1,827	1,773
Amounts recognized on previous deferrals	(12,134)	(13,569)
Balance, end of the period	$ 16,999	$ 20,887