Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Basis of Presentation (Details)	3 Months Ended		9 Months Ended
Basis of Presentation (Details)	Jan. 31, 2020 USD ($) $ / $	Jan. 31, 2019 USD ($)	Jan. 31, 2020 USD ($) $ / $	Jan. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items]
Impairment charges related to goodwill	$ 0	$ 0	$ 0	$ 0
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Impairment charges related to other intangible assets	0	$ 0	0	$ 0
Foreign Exchange Forward \| Not Designated as Hedging Instrument
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount	115,700,000		115,700,000
Foreign Exchange Forward \| Not Designated as Hedging Instrument \| Prepaid Expenses and Other Current Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Derivative asset, fair value, gross asset	$ 200,000		$ 200,000
Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives			3 years
Minimum \| Foreign Exchange Forward \| Not Designated as Hedging Instrument
Finite-Lived Intangible Assets [Line Items]
Derivative, forward exchange rate \| $ / $	19.74		19.74
Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives			6 years
Long \| Maximum \| Foreign Exchange Forward \| Not Designated as Hedging Instrument
Finite-Lived Intangible Assets [Line Items]
Derivative, forward exchange rate \| $ / $	19.91		19.91