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Income Taxes - Deferred Tax Assets (Liabilities) Related to Temporary Differences (Detail) - USD ($) $ in Thousands | Apr. 30, 2026 | Apr. 30, 2025
--- | --- | ---
Deferred Tax Assets, Net [Abstract] |  |
Inventory reserves | $ 9,794 | $ 11,637
Accrued expenses, including compensation | 3,783 | 2,930
Net operating loss carryforwards and tax credits | 9,931 | 8,200
Operating lease liability | 0 | 128
Product liability | 198 | 151
Workers' compensation | 606 | 684
State bonus depreciation | 880 | 980
Warranty reserve | 643 | 760
Stock-based compensation | 562 | 1,573
Section 174 capitalized R&D expense | 95 | 2,983
Other | 978 | 942
Total deferred tax assets before valuation allowance | 27,470 | 30,968
Valuation allowance | (7,408) | (6,169)
Net deferred tax assets | 20,062 | 24,799
Operating lease right-of-use assets | 0 | (96)
Property, plant, and equipment | (12,549) | (11,679)
Intangible assets | (2,803) | (2,418)
Other | (363) | (346)
Deferred Tax Liabilities, Net, Total | (15,715) | (14,539)
Net Deferred Tax Asset | $ 4,347 | $ 10,260

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