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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Apr. 30, 2012
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 34,217 | $ 9,724
Accrued expenses and reserves | 29,884 | 28,383
Book over tax depreciation of property and equipment | 19,881 | 24,899
Alternative minimum tax credit carryforwards | 3,330 | 3,330
General business tax credit carryforwards | 2,095 | 1,438
Unrealized loss on commodity hedges | 1,852 | 688
Stock awards | 1,177 | 1,140
Deferred revenue |  | 218
Other | 964 | 370
Total deferred tax assets | 93,400 | 70,190
Less: valuation allowance | (70,352) | (50,700)
Total deferred tax assets after valuation allowance | 23,048 | 19,490
Deferred tax liabilities: |  |
Amortization of intangibles | (25,973) | (21,114)
Other | (143) |
Total deferred tax liabilities | (26,116) | (21,114)
Net deferred tax (liability) asset | $ (3,068) | $ (1,624)

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