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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2014 | Apr. 30, 2013
--- | --- | ---
Deferred tax assets: |  |
Accrued employee benefit expenses | $ 462 | $ 568
Allowance for doubtful accounts | 68 | 52
Deferred compensation | 1,432 | 1,688
Tax credits | 304 | 336
Unrecognized actuarial loss, defined benefit plans | 3,486 | 4,309
Other | 98 | 86
Total deferred tax assets | 5,850 | 7,039
Deferred tax liabilities: |  |
Book basis in excess of tax basis of property, plant and equipment | (1,826) | (1,953)
Prepaid pension | (2,098) | (2,260)
Other | 155 | 128
Total deferred tax liabilities | (3,769) | (4,085)
Less: valuation allowance | (50) | (59)
Net deferred tax assets (liabilities) | 2,031 | 2,895
Deferred tax assets classified in the balance sheet: |  |
Current | 646 | 654
Non-current | 1,385 | 2,241
Net deferred tax assets (liabilities) | $ 2,031 | $ 2,895

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- Definition The cumulative amount of future tax effects arising from the unused tax credit carryforward attributable to some other tax carryforward (not otherwise stated) that cannot be utilized on the tax return during the period and that may be carried forward and are expected to more likely than not be used to reduce taxable income or taxes payable in future periods. + References No definition available. + Details
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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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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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