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Retirement Benefits - Additional Information (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan remaining pension plan liabilities		$ 17,800,000
Employer contributions		287,000
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Employer matching contributions	$ 1,177,000	957,000
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Employer matching contributions	$ 247,000	$ 238,000

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