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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020 | Apr. 30, 2021
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense (benefit) | $ 195 | $ (197) | $ 446 | $ (176) |
Effective income tax rate | (6.80%) | 54.40% | (11.30%) | 18.50% |
Deferred tax liability, global tax exposure for unremitted earnings of international subsidiaries | $ 860 |  | $ 860 |  | $ 776

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiary and other recognized entity not within country of domicile. Includes, but is not limited to, other basis differences. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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