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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020 | Apr. 30, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense (benefit) | $ (813) | $ (350) | $ (989) | $ 1,822 |
Effective income tax rate | 113.20% | 15.50% | 59.30% | 104.50% |
Deferred tax liability, global tax exposure for unremitted earnings of international subsidiaries | $ 647 |  | $ 647 |  | $ 785
Income tax receivable | 4,205 |  | 4,205 |  | $ 2,717
Kewaunee Labway India | Ministry of Finance, India |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Dividend distribution tax withholding | $ 18 | $ 50 | $ 99 | $ 2,214 |
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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