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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Apr. 30, 2018
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, 2015 |  |  | (127 | ) |  |  | (1,011 | ) |  |  | (6,742 | ) |  |  | (7,880 | )
Effect of changes in tax rates |  |  | 1 |  |  |  | — |  |  |  | 88 |  |  |  | 89 |
Foreign currency translation adjustment |  |  | — |  |  |  | (217 | ) |  |  | — |  |  |  | (217 | )
Change in fair value of cash flow hedges |  |  | 37 |  |  |  | — |  |  |  | — |  |  |  | 37 |
Change in unrecognized actuarial loss on pension obligations |  |  | — |  |  |  | — |  |  |  | 716 |  |  |  | 716 |
Income tax effect |  |  | (15 | ) |  |  | — |  |  |  | (356 | ) |  |  | (371 | )
Balance at April 30, 2016 |  |  | (104 | ) |  |  | (1,228 | ) |  |  | (6,294 | ) |  |  | (7,626 | )
Effect of changes in tax rates |  |  | 1 |  |  |  | — |  |  |  | 30 |  |  |  | 31 |
Foreign currency translation adjustment |  |  | — |  |  |  | 231 |  |  |  | — |  |  |  | 231 |
Change in fair value of cash flow hedges |  |  | 104 |  |  |  | — |  |  |  | — |  |  |  | 104 |
Change in unrecognized actuarial loss on pension obligations |  |  | — |  |  |  | — |  |  |  | 1,609 |  |  |  | 1,609 |
Income tax effect |  |  | (41 | ) |  |  | — |  |  |  | (627 | ) |  |  | (668 | )
Balance at April 30, 2017 |  |  | (40 | ) |  |  | (997 | ) |  |  | (5,282 | ) |  |  | (6,319 | )
Effect of changes in tax rates |  |  | 3 |  |  |  | — |  |  |  | 996 |  |  |  | 999 |
Foreign currency translation adjustment |  |  | — |  |  |  | (430 | ) |  |  | — |  |  |  | (430 | )
Change in fair value of cash flow hedges |  |  | 57 |  |  |  | — |  |  |  | — |  |  |  | 57 |
Change in unrecognized actuarial loss on pension obligations |  |  | — |  |  |  | — |  |  |  | (586 | ) |  |  | (586 | )
Income tax effect |  |  | (23 | ) |  |  | — |  |  |  | 402 |  |  |  | 379 |
Balance at April 30, 2018 |  | $ | (3 | ) |  | $ | (1,427 | ) |  | $ | (4,470 | ) |  | $ | (5,900 | )

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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=114867106&loc=d3e526-108580 + Details
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