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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Apr. 30, 2016
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 Hedge |  |  | Foreign Currency Translation Adjustment |  |  | Minimum Pension Liability Adjustment |  |  | Total Accumulated Other Comprehensive Income (Loss) |
Balance at April 30, 2013 |  | $ | (215) |  |  | $ | (344) |  |  | $ | (6,768) |  |  | $ | (7,327) |
Foreign currency translation adjustment |  |  | — |  |  |  | (321) |  |  |  | — |  |  |  | (321) |
Change in fair value of cash flow hedges |  |  | 133 |  |  |  | — |  |  |  | — |  |  |  | 133 |
Change in unrecognized actuarial loss on pension obligations |  |  | — |  |  |  | — |  |  |  | 2,116 |  |  |  | 2,116 |
Income tax effect |  |  | (50) |  |  |  | — |  |  |  | (824) |  |  |  | (874) |
Balance at April 30, 2014 |  |  | (132) |  |  |  | (665) |  |  |  | (5,476) |  |  |  | (6,273) |
Effect of changes in tax rates |  |  | (2) |  |  |  | — |  |  |  | 63 |  |  |  | 61 |
Foreign currency translation adjustment |  |  | — |  |  |  | (346) |  |  |  | — |  |  |  | (346) |
Change in fair value of cash flow hedges |  |  | 8 |  |  |  | — |  |  |  | — |  |  |  | 8 |
Change in unrecognized actuarial loss on pension obligations |  |  | — |  |  |  | — |  |  |  | (2,049) |  |  |  | (2,049) |
Income tax effect |  |  | (1) |  |  |  | — |  |  |  | 720 |  |  |  | 719 |
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) |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e526-108580 + Details
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