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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	Jan. 31, 2024 USD ($) CompensationPlan	Apr. 30, 2023 USD ($) CompensationPlan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 2,299	$ 2,463
Financial Liabilities	$ 2,898	$ 2,910
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	$ 2,898	$ 2,910
Trading securities held in non-qualified compensation plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,323	1,105
Cash surrender value of life insurance policies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	976	1,358
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,323	1,105
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	1,323	1,105
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	976	1,358
Financial Liabilities	2,898	2,910
Level 2 | Non-qualified compensation plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	2,898	2,910
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	$ 976	$ 1,358

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