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Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020 | Apr. 30, 2021
Derivative Instruments and Hedging Activities [Abstract] |  |  |  |  |
Total debt outstanding | $ 1,045,005 |  | $ 1,045,005 |  | $ 821,588
Unamortized debt issuance costs | 400 |  | 400 |  | 500
Variable rate loans outstanding | 1,045,400 |  | 1,045,400 |  |
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 | $ 900 | 2,200 | $ 1,800 |
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 | 3,200 |  | 3,200 |  |
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 | 700 |  | 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 | 2,100 |  | 2,100 |  |
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 | $ 1,100 |  | $ 1,100 |  | $ 5,600

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