INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Apr. 30, 2020
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	$ (237,027)	$ 124,000	$ (261,306)	$ (112,985)	$ (468,420)
Income taxes (benefit)	$ (14,547)	$ 30,500	(77,752)	$ 15,939	$ (139,142)
Effective tax rate	6.10%	24.60%		(14.10%)	29.70%
Discrete income tax expense (benefit)	$ 31,600			$ 32,200	$ (25,200)
Increase in effective tax rate from discrete item, percent				(28.50%)	5.40%
Gross unrecognized tax benefits increase (decrease)				$ 74,200	$ (28,400)
Change in tax benefits that are reasonably possible	70,000			70,000
Income taxes receivable	57,900		36,700	57,900	36,700	$ 28,500
Deferred tax liabilities, net	113,500		35,000	113,500	35,000	22,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	242,253		156,700	242,253	156,700	168,062
Additions based on tax positions related to prior years				103,822
Reductions based on tax positions related to prior years				(8,180)
Reductions related to settlements with tax authorities				(17,632)
Expiration of statute of limitations				(3,819)
Unrecognized tax benefits. ending balance	$ 242,253		$ 156,700	$ 242,253	$ 156,700	$ 168,062