Financial Derivatives and Hedging - Schedule of Fair Values of Derivative Instruments in Consolidated Balance Sheets (Details) - Designated as Hedging Instrument - Interest Rate Swap - USD ($)	Apr. 30, 2020	Apr. 30, 2019
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	$ 17,800,000	$ 0
Other current liabilities
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	800,000	0
Other non-current liabilities
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	$ 17,000,000.0	$ 0

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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant