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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Apr. 30, 2015 | Apr. 30, 2014
--- | --- | ---
Deferred tax assets: |  |
Accrued employee benefit expenses | $ 535 | $ 462
Allowance for doubtful accounts | 53 | 68
Deferred compensation | 1,573 | 1,432
Tax credits | 237 | 304
Unrecognized actuarial loss, defined benefit plans | 4,206 | 3,486
Other | 354 | 98
Total deferred tax assets | 6,958 | 5,850
Deferred tax liabilities: |  |
Book basis in excess of tax basis of property, plant and equipment | (1,594) | (1,826)
Prepaid pension | (2,164) | (2,098)
Other | 134 | 155
Total deferred tax liabilities | (3,624) | (3,769)
Less: valuation allowance | (10) | (50)
Net deferred tax assets (liabilities) | 3,324 | 2,031
Deferred tax assets classified in the balance sheet: |  |
Current | 856 | 646
Non-current | 2,468 | 1,385
Net deferred tax assets (liabilities) | $ 3,324 | $ 2,031

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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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