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Income Taxes - Deferred Tax Assets (Deferred Tax Liabilities) Related to Temporary Differences (Detail) - USD ($) $ in Thousands | Apr. 30, 2017 | Apr. 30, 2016
--- | --- | ---
Deferred tax assets (liabilities): |  |
Net deferred tax (liability) | $ (25,620) | $ (12,161)
Non Current |  |
Deferred tax assets (liabilities): |  |
Net operating loss carryforwards and tax credits | 2,902 | 2,712
Inventories | 9,325 | 8,789
Accrued expenses, including compensation | 8,194 | 7,255
Environmental reserves | 279 | 264
Product liability | 515 | 748
Accrued promotions | 4,193 | 2,463
Workers' compensation | 796 | 1,082
Warranty reserve | 2,114 | 3,194
Stock-based compensation | 4,734 | 3,295
State bonus depreciation | 1,049 | 937
Property taxes | (189) | (140)
Property, plant, and equipment | (30,017) | (27,006)
Intangible assets | (27,032) | (14,289)
Pension | 179 | 123
Other | 130 | 973
Less valuation allowance | $ (2,792) | $ (2,561)

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