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Summary of Significant Accounting Policies - Schedule of Property Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 61,368	$ 60,326
Less accumulated depreciation	(44,966)	(45,205)
Net property, plant and equipment	16,402	15,121
Land
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	41	41
Building and improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 17,147	$ 17,164
Building and improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful Life (in years)	10 years	10 years
Building and improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful Life (in years)	40 years	40 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 44,180	$ 43,121
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Life (in years)	5 years	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Life (in years)	10 years	10 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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