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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, 2026	Apr. 30, 2025	Apr. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred income tax benefit			$ 20	$ 2,202
Options outstanding (in shares)			0	0	24,700
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares)			226,280	187,226	168,791
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)			290,636
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			$ 2,126	$ 1,441
Deferred income tax benefit			$ 452	$ 337
Vesting period (in years)			3 years
Remaining estimated compensation expense			$ 2,311
Remaining estimated compensation expense, period			1 year 7 months 6 days
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