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Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020
Consolidated Statements of Comprehensive (Loss) Income |  |  |
Unrealized (loss) gain on available-for-sale investments, deferred tax benefit | $ 8 | $ 1 | $ 14

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- Definition Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4569616-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4569643-111683 + Details
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