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Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Apr. 30, 2020
Derivative Instruments and Hedging Activities [Abstract] |  |  |
Total debt outstanding | $ 846,701 |  | $ 775,025
Unamortized debt issuance costs | 600 |  |
Variable rate loans outstanding | 847,300 |  |
Interest Rate Swaps [Member] | Cash Flow Hedging [Member] |  |  |
Derivative Instruments and Hedging Activities [Abstract] |  |  |
Notional amount of derivative liability | 300,000 |  | 300,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member] |  |  |
Derivative Instruments and Hedging Activities [Abstract] |  |  |
Net gain (losses) reclassified from Accumulated Other Comprehensive Loss | (900) | $ 200 |
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |
Derivative Instruments and Hedging Activities [Abstract] |  |  |
Assets fair value of derivative instrument | $ 8,200 |  | $ 8,300

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