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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense (benefit) | $ (350) | $ 20 | $ 1,822 | $ 803
Effective income tax rate | 15.50% | 57.10% | 104.50% | 21.80%
Deferred tax liability, global tax exposure for unremitted earnings of international subsidiaries | $ 1,100 |  | $ 1,100 |
Kewaunee Labway India | Ministry of Finance, India |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate |  |  | 20.60% |
Dividend distribution tax withholding | $ 50 |  | $ 2,214 |

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