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Income Taxes - Deferred Tax Assets (Liabilities) Related to Temporary Differences (Detail) - USD ($) $ in Thousands | Apr. 30, 2018 | Apr. 30, 2017
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Deferred tax assets (liabilities): |  |
Net deferred tax (liability) | $ (12,895) | $ (25,620)
Non Current |  |
Deferred tax assets (liabilities): |  |
Net operating loss carryforwards and tax credits | 3,372 | 2,902
Inventories | 6,204 | 9,325
Accrued expenses, including compensation | 3,037 | 8,194
Environmental reserves | 258 | 279
Product liability | 353 | 515
Accrued promotions | 1,061 | 4,193
Workers' compensation | 485 | 796
Warranty reserve | 1,843 | 2,114
Stock-based compensation | 3,576 | 4,734
State bonus depreciation | 1,117 | 1,049
Property taxes | (160) | (189)
Property, plant, and equipment | (18,434) | (30,017)
Intangible assets | (12,510) | (27,032)
Pension | 218 | 179
Other | 21 | 130
Less valuation allowance | $ (3,336) | $ (2,792)

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