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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2020 | Oct. 31, 2019 | Apr. 30, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense (benefit) | $ (197) | $ 2,003 | $ (176) | $ 2,172 |
Effective income tax rate | 54.40% | 1267.70% | 18.50% | 428.40% |
Deferred tax liability, global tax exposure for unremitted earnings of international subsidiaries | $ 735 |  | $ 735 |  | $ 785
Kewaunee Labway India | Ministry of Finance, India |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Dividend distribution tax withholding | $ 92 | $ 2,083 | $ 80 | $ 2,083 |
Kewaunee Labway India | Ministry of Finance, India | U.S. government |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Effective income tax rate |  |  | 10.00% |  |
Kewaunee Labway India | Ministry of Finance, India | Singapore government |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Effective income tax rate |  |  | 15.00% |  |

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