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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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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Nominal or face amount used to calculate payments on the derivative liability.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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