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Stock Options and Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Aug. 26, 2015	Aug. 31, 2023	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred income tax benefit			$ 2,203	$ 10,996
Options outstanding (in shares)			0	24,700	33,900
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares)			187,226	168,791	159,640
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants (in shares)		168,791
2017 Plan \| Restricted Stock Units (RSUs) \| Share-Based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares)		64,633
2008 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under stock option plan (in shares)			300,000
Increase in number of shares available under stock option plan (in shares)	300,000
2008 Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Terms of award (in years)			10 years
Two Thousand Twenty Three Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants (in shares)			357,472
Two Thousand Twenty Three Omnibus Incentive Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 1,441	$ 1,018
Deferred income tax benefit			$ 337	$ 223
Vesting period (in years)			3 years
Remaining estimated compensation expense			$ 1,964
Two Thousand Twenty Three Omnibus Incentive Plan \| Restricted Stock Units (RSUs) \| Share-Based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares)		374,633
Increase in number of shares reserved for issuance (in shares)		310,000
Two Thousand Twenty Three Omnibus Incentive Plan \| Service Components \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			3 years