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DERIVATIVE INSTRUMENT (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
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 |  |

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