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Basis of Presentation (Details)	3 Months Ended	6 Months Ended
Basis of Presentation (Details)	Oct. 31, 2018 USD ($) $ / $	Oct. 31, 2018 USD ($) $ / $	Oct. 31, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Impairment charges related to goodwill	$ 0	$ 0	$ 0
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Impairment charges related to other intangible assets	0	0	$ 0
Foreign Exchange Forward \| Not Designated as Hedging Instrument
Finite-Lived Intangible Assets [Line Items]
Derivative, notional amount	212,300,000	212,300,000
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 \| Foreign Exchange Forward \| Not Designated as Hedging Instrument
Finite-Lived Intangible Assets [Line Items]
Derivative, forward exchange rate \| $ / $	20.00	20.00
Long \| Maximum \| Foreign Exchange Forward \| Not Designated as Hedging Instrument
Finite-Lived Intangible Assets [Line Items]
Derivative, forward exchange rate \| $ / $	20.47	20.47