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

Deferred tax assets, environmental and products liabilities.

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- Definition

Deferred tax assets liabilities intangible assets.

+ References

No definition available.

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Deferred Tax Assets Liabilities Right Of Use Assets

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No definition available.

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- Definition

The tax effect as of the balance sheet date of the amount of future tax deductions arising from tax loss and credit carryforwards which can only be utilized if sufficient tax-basis income is generated in future periods and providing tax laws continue to allow such deductions.

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No definition available.

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- Definition

Deferred Tax Assets Section 174 capitalized R&D expense

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No definition available.

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- Definition

Deferred tax assets state bonus depreciation.

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No definition available.

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- Definition

Deferred Tax Lease Liability, Operating

+ References

No definition available.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-6

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves and accruals, classified as other.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from warranty reserves.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Amount of deferred tax liability attributable to taxable temporary differences classified as other.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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