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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Apr. 30, 2021
Equity [Abstract] |
Schedule of Before Tax Income (Loss) Related Income Tax Effect and Accumulated Balances | The before tax income (loss), related income tax effect, and accumulated balances are as follows:
$ in thousands |  | Cash Flow Hedges |  | Foreign Currency Translation Adjustment |  | Minimum Pension Liability Adjustment |  | Total Accumulated Other Comprehensive Income (Loss)
Balance at April 30, 2019 |  | $ | — |  |  | $ | (1,891) |  |  | $ | (4,516) |  |  | $ | (6,407) |
Foreign currency translation adjustment |  | — |  |  | (444) |  |  | — |  |  | (444) |
Change in fair value of cash flow hedges |  | 1 |  |  | — |  |  | — |  |  | 1 |
Change in unrecognized actuarial loss on pension obligations |  | — |  |  | — |  |  | (3,592) |  |  | (3,592) |
Income tax effect |  | (1) |  |  | 1 |  |  | 844 |  |  | 844 |
Balance at April 30, 2020 |  | — |  |  | (2,334) |  |  | (7,264) |  |  | (9,598) |
Foreign currency translation adjustment |  | — |  |  | (23) |  |  | — |  |  | (23) |
Change in unrecognized actuarial loss on pension obligations |  | — |  |  | — |  |  | 6,044 |  |  | 6,044 |
Balance at April 30, 2021 |  | $ | — |  |  | $ | (2,357) |  |  | $ | (1,220) |  |  | $ | (3,577) |

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e526-108580 + Details
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