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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	12 Months Ended
	Apr. 30, 2026 USD ($) compensation_plan	Apr. 30, 2025 USD ($) compensation_plan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 4,307	$ 3,264
Financial Liabilities	$ 4,807	$ 3,708
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	Total	Total
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	Total	Total
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	$ 2,720	$ 1,861
Cash Surrender Value of Life Insurance Policies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,587	1,403
Non Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	4,807	3,708
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	2,720	1,861
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	2,720	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 1 | Non Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	1,587	1,403
Financial Liabilities	4,807	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	1,587	1,403
Level 2 | Non Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	4,807	3,708
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	0	0
Financial Liabilities	0	0
Level 3 | Trading Securities Held in Non-Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	0	0
Level 3 | Cash Surrender Value of Life Insurance Policies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	0	0
Level 3 | Non Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	$ 0	$ 0

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