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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, 2024 USD ($) CompensationPlan	Apr. 30, 2024 USD ($) CompensationPlan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 3,122	$ 2,642
Financial Liabilities	$ 3,523	$ 3,009
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	$ 3,523	$ 3,009
Trading securities held in non-qualified compensation plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,654	1,565
Cash surrender value of life insurance policies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,468	1,077
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,654	1,565
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	1,654	1,565
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	1,468	1,077
Financial Liabilities	3,523	3,009
Level 2 | Non-qualified compensation plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	3,523	3,009
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	$ 1,468	$ 1,077

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