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Income Taxes (Schedule Of Significant Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Apr. 30, 2016 | Apr. 30, 2015
--- | --- | ---
Deferred tax assets: |  |
Pension benefits | $ 24,930 | $ 23,074
Accounts receivable | 5,981 | 5,523
Product liability | 1,141 | 1,031
Employee benefits | 7,101 | 7,429
Other | 353 | 266
Gross deferred tax assets, before valuation allowance | 44,373 | 37,323
Valuation allowance | (3,061) | 0
Gross deferred tax assets, after valuation allowance | 41,312 | 37,323
Deferred tax liabilities: |  |
Inventory | 440 | 451
Depreciation | 8,298 | 3,485
Total | 8,738 | 3,936
Net deferred tax asset | 32,574 | 33,387
State [Member] |  |
Deferred tax assets: |  |
State tax credit carryforwards | $ 4,867 | $ 0

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