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Income Taxes (Schedule Of Significant Components Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2014 | Apr. 30, 2013
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Income Taxes [Abstract] |  |
Deferred tax assets. Pension benefits | $ 15,381 | $ 20,563
Deferred tax assets, Accounts receivable | 4,603 | 3,983
Deferred tax assets, Product liability | 745 | 700
Deferred tax assets, Employee benefits | 8,523 | 11,243
Deferred tax assets, Net operating loss carryforward | 469 | 1,099
Deferred tax assets, Income tax credits | 0 | 1,088
Deferred tax assets. Depreciation | 0 | 73
Deferred Tax Assets, Other | 199 | 496
Total | 29,920 | 39,245
Deferred tax liabilities, Inventory | 496 | 502
Deferred tax liabilities, Depreciation | 2,374 | 0
Total | 2,870 | 502
Net deferred tax asset | $ 27,050 | $ 38,743

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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