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Income Taxes (Schedule Of Significant Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Apr. 30, 2017 | Apr. 30, 2016
--- | --- | ---
Deferred tax assets: |  |
Pension benefits | $ 8,852 | $ 24,930
Accounts receivable | 6,938 | 5,981
Product liability | 1,272 | 1,141
Employee benefits | 7,914 | 7,101
Other | 862 | 353
Gross deferred tax assets, before valuation allowance | 29,921 | 44,373
Valuation allowance | (2,446) | (3,061)
Gross deferred tax assets, after valuation allowance | 27,475 | 41,312
Deferred tax liabilities: |  |
Inventory | 297 | 440
Depreciation | 9,131 | 8,298
Total | 9,428 | 8,738
Net deferred tax asset | 18,047 | 32,574
State [Member] |  |
Deferred tax assets: |  |
State tax credit carryforwards | $ 4,083 | $ 4,867

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