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DERIVATIVE INSTRUMENT (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Derivative [Line Items] |  |  |
Gain recognized in other comprehensive income (loss) | $ 1,600,000 |  |
Gain reclassified from AOCI into income | 34,178,000 | $ 34,314,000 | $ 28,417,000
Cash flow hedge gain (loss) to be reclassified within twelve months | 21,000 |  |
Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative instrument - interest rate swap | 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 reclassified from AOCI into income | $ 152,000 |  |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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