EQUITY - Equity Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Apr. 30, 2018
Equity
Noncontrolling interests - Operating Partnership (in shares)	13,895,000		14,099,000
Common stock outstanding (in shares)	119,507,000		119,526,000
Units converted to common stock (in shares)	90,000	960,000
Aggregate cost of stock conversion	$ 480	$ 5,700
Average price of shares issued (in dollars per share)	$ 5.31	$ 5.97
2015 Incentive Plan [Member]
Equity
Equity awards issued (in shares)	43,000	75,000
Total grant-date value shares issued	$ 264	$ 445
Exercise of Exchange Rights [Member]
Equity
Units converted to common stock (in shares)	114,000	0
Aggregate cost of stock conversion	$ 291