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DERIVATIVE INSTRUMENTS DERIVATIVE INSTRUMENTS - Schedule of Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Apr. 30, 2018
Derivative [Line Items] |  |  |  |  |
Interest expense | $ 7,997 | $ 8,509 | $ 16,382 | $ 16,640 |
Net income (loss) | (5,611) | 13,139 | (1,895) | (140) |
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net income (loss) | 90 | 0 | 119 | 0 |
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest expense | 90 | 0 | 119 | 0 |
Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value | 3,321 |  | 3,321 |  | $ 1,779
Gain (Loss) Recognized in OCI | 1,247 | 0 | 1,455 | 0 |
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) Recognized in OCI | 1,247 | $ 0 | 1,455 | $ 0 |
Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value | $ 3,321 |  | $ 3,321 |  | $ 1,779

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