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Fair Value of Financial Instruments - Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured Recurring Basis (Detail) $ in Thousands	Jul. 31, 2025 USD ($) CompensationPlan	Apr. 30, 2025 USD ($) CompensationPlan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 3,854	$ 3,264
Financial Liabilities	$ 4,334	$ 3,708
Number of non-qualified compensation plans maintained | CompensationPlan	2	2
Non-qualified compensation plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	$ 4,334	$ 3,708
Trading securities held in non-qualified compensation plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	2,340	1,861
Cash surrender value of life insurance policies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,514	1,403
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	2,340	1,861
Financial Liabilities	0	0
Level 1 | Non-qualified compensation plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	0	0
Level 1 | Trading securities held in non-qualified compensation plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	2,340	1,861
Level 1 | Cash surrender value of life insurance policies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,514	1,403
Financial Liabilities	4,334	3,708
Level 2 | Non-qualified compensation plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	4,334	3,708
Level 2 | Trading securities held in non-qualified compensation plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	0	0
Level 2 | Cash surrender value of life insurance policies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 1,514	$ 1,403

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