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Derivative Instruments and Hedging Activities (Details) $ in Thousands, € in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2021 USD ($) | Jan. 31, 2020 USD ($) | Jan. 31, 2021 USD ($) | Jan. 31, 2020 USD ($) | Jan. 31, 2021 EUR (€) | Apr. 30, 2020 USD ($)
Derivative Instruments and Hedging Activities [Abstract] |  |  |  |  |  |
Total debt outstanding | $ 960,741 |  | $ 960,741 |  |  | $ 775,025
Unamortized debt issuance costs | 600 |  | 600 |  |  |
Variable rate loans outstanding | 961,300 |  | 961,300 |  |  |
Interest Rate Swaps [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities [Abstract] |  |  |  |  |  |
Notional amount of derivative liability | 300,000 |  | 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 | (1,000) | $ 100 | (2,800) | $ 600 |  |
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 | 6,500 |  | 6,500 |  |  | $ 8,300
Forward Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities [Abstract] |  |  |  |  |  |
Open derivative contract | $ 38,800 |  | $ 38,800 |  | € 32.0 |

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 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 (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
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