REDEEMABLE NONCONTROLLING INTERESTS (Details) $ in Thousands	9 Months Ended
	Jan. 31, 2017 USD ($) item
Redeemable Noncontrolling Interest [Line Items]
Balance at beginning of fiscal year	$ 7,522
Contributions	7,188
Balance at close of fiscal year	$ 7,300
Southgate - Minot, ND [Member]
Redeemable Noncontrolling Interest [Line Items]
Number of Joint Ventures with Buy Sell Options | item	1
Commitment Period for Joint Venture Acquisition	4 years
Balance at beginning of fiscal year	$ 7,522
Contributions	500
Conversion of notes payable to IRET equity	(420)
Net income	(302)
Balance at close of fiscal year	$ 7,300