LOSS PER SHARE AND STOCKHOLDERS' EQUITY (Computations of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Earnings Per Share [Abstract]
Net loss from continuing operations attributable to shareholders	$ (128,026)	$ (119,779)	$ (457,304)	$ (439,513)
Amounts allocated to participating securities	(169)	(160)	(468)	(446)
Net loss from continuing operations attributable to common shareholders	$ (128,195)	$ (119,939)	$ (457,772)	$ (439,959)
Basic weighted average common shares (in shares)	194,077	205,532	198,064	206,242
Potential dilutive shares (in shares)	0	0	0	0
Dilutive weighted average common shares (in shares)	194,077	205,532	198,064	206,242
Basic (in usd per share)	$ (0.66)	$ (0.58)	$ (2.31)	$ (2.13)
Diluted (in usd per share)	$ (0.66)	$ (0.58)	$ (2.31)	$ (2.13)