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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2014 | Apr. 30, 2013
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Deferred tax assets: |  |
Net operating loss carryforwards | $ 36,594 | $ 34,217
Accrued expenses and reserves | 30,690 | 29,884
Book over tax depreciation of property and equipment | 28,868 | 19,881
Alternative minimum tax credit carryforwards | 3,330 | 3,330
General business tax credit carryforwards | 2,666 | 2,095
Capital loss carryforwards | 2,510 |
Stock awards | 1,315 | 1,177
Unrealized loss on commodity hedges | 1,115 | 1,852
Other | 1,496 | 964
Total deferred tax assets | 108,584 | 93,400
Less: valuation allowance | (84,540) | (70,352)
Total deferred tax assets after valuation allowance | 24,044 | 23,048
Deferred tax liabilities: |  |
Amortization of intangibles | (28,210) | (25,973)
Other | (286) | (143)
Total deferred tax liabilities | (28,496) | (26,116)
Net deferred tax liability | $ (4,452) | $ (3,068)

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