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Summary of Significant Accounting Policies - Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured Recurring and Nonrecurring Basis (Detail) $ in Thousands	Apr. 30, 2022 USD ($) compensation_plan	Apr. 30, 2021 USD ($) compensation_plan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 2,590	$ 2,757
Financial Liabilities	$ 3,003	$ 3,169
Number of non-qualified compensation plans maintained | compensation_plan	2	2
Trading Securities Held in Non-Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 1,219	$ 1,299
Cash Surrender Value of Life Insurance Policies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,371	1,458
Non Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	3,003	3,169
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,219	1,299
Level 1 | Trading Securities Held in Non-Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,219	1,299
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,371	1,458
Financial Liabilities	3,003	3,169
Level 2 | Cash Surrender Value of Life Insurance Policies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,371	1,458
Level 2 | Non Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	$ 3,003	$ 3,169

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
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