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Derivative Instruments and Hedging Activities (Details) $ in Thousands, € in Millions	3 Months Ended		9 Months Ended
	Jan. 31, 2022 USD ($)	Jan. 31, 2021 USD ($)	Jan. 31, 2022 USD ($)	Jan. 31, 2021 USD ($)	Apr. 30, 2021 USD ($)	Jan. 31, 2021 EUR (€)
Derivative Instruments and Hedging Activities [Abstract]
Total debt outstanding	$ 917,670		$ 917,670		$ 821,588
Unamortized debt issuance costs	400		400		500
Variable rate loans outstanding	918,100		918,100
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities [Abstract]
Notional amount of derivative liability	400,000		400,000		400,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative Instruments and Hedging Activities [Abstract]
Net losses reclassified from Accumulated other comprehensive loss	1,100	$ 1,000	3,300	$ 2,800
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities [Abstract]
Liabilities of derivative instrument	1,500		1,500
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Non-current Assets [Member]
Derivative Instruments and Hedging Activities [Abstract]
Assets fair value of derivative instrument	1,700		1,700
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Accrued Liabilities [Member]
Derivative Instruments and Hedging Activities [Abstract]
Liabilities of derivative instrument	1,100		1,100
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Long-term Liabilities [Member]
Derivative Instruments and Hedging Activities [Abstract]
Liabilities of derivative instrument	$ 400		$ 400		$ 5,600
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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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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