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Summary of Significant Accounting Policies - Schedule of Property Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 56,676	$ 54,648
Less accumulated depreciation	(40,214)	(39,987)
Net property, plant and equipment	16,462	14,661
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	$ 16,594	$ 16,489
Building and improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	10 years	10 years
Building and improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	40 years	40 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 40,041	$ 38,118
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	5 years	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	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
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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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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+ References

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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