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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense | $ 2,003 | $ 388 | $ 2,172 | $ 783
Effective income tax rate | 1267.70% | 22.00% | 428.40% | 21.40%
Deferred tax liability, global tax exposure for unremitted earnings of international subsidiaries | $ 1,730 |  | $ 1,730 |
Kewaunee Labway India | Ministry of Finance, India |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate |  |  | 20.60% |
Dividend distribution tax withholding |  |  | $ 353 |

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