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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2026	Apr. 30, 2025
Income Taxes [Line Items]
Deferred tax asset, Section 174 addback	$ 1,892,000	$ 3,269,000
Additional valuation allowance	165,000
Deferred tax asset valuation allowance	768,000	933,000
Foreign tax credit carryforwards	638,000	638,000
Increase (decrease) in valuation allowance	$ 5,000	7,000
Minimum
Income Taxes [Line Items]
Federal, state and local tax returns period (in years)	3 years
Foreign subsidiaries tax returns period (in years)	3 years
Maximum
Income Taxes [Line Items]
Federal, state and local tax returns period (in years)	4 years
Foreign subsidiaries tax returns period (in years)	7 years
India Income Tax Department
Income Taxes [Line Items]
Tax withholding expense	$ 437,000	$ 416,000

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 2
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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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