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Basis of Presentation (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2019 USD ($) $ / $ | Jan. 31, 2019 USD ($) $ / $ | Jan. 31, 2018 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 | 105,900,000 | 105,900,000 |
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 | $ 300,000 | $ 300,000 |
Minimum | Foreign Exchange Forward | Not Designated as Hedging Instrument |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Derivative, forward exchange rate | $ / $ | 20.28 | 20.28 |
Long | Maximum | Foreign Exchange Forward | Not Designated as Hedging Instrument |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Derivative, forward exchange rate | $ / $ | 20.47 | 20.47 |

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