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DERIVATIVE INSTRUMENT (Details) - USD ($)	3 Months Ended
DERIVATIVE INSTRUMENT (Details) - USD ($)	Jul. 31, 2018	Jul. 31, 2017	Apr. 30, 2018
Derivative [Line Items]
Gain recognized in other comprehensive income (loss)	$ 208,000
Gain (loss) reclassification from accumulated OCI to income	8,385,000	$ 8,131,000
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative instrument - interest rate swap	2,000,000		$ 1,800,000
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	70,000,000
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Derivative [Line Items]
Gain (loss) reclassification from accumulated OCI to income	$ 29,000