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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, 2024
USD ($)
compensation_plan
Apr. 30, 2023
USD ($)
compensation_plan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Assets $ 2,642 $ 2,463
Financial Liabilities $ 3,009 $ 2,910
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Total  
Number of non-qualified compensation plans maintained | compensation_plan 2 2
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Total  
Trading Securities Held in Non-Qualified Compensation Plans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Assets $ 1,565 $ 1,105
Cash Surrender Value of Life Insurance Policies    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Assets 1,077 1,358
Non Qualified Compensation Plans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Liabilities 3,009 2,910
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Assets 1,565 1,105
Level 1 | Trading Securities Held in Non-Qualified Compensation Plans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Assets 1,565 1,105
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Assets 1,077 1,358
Financial Liabilities 3,009 2,910
Level 2 | Cash Surrender Value of Life Insurance Policies    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Assets 1,077 1,358
Level 2 | Non Qualified Compensation Plans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Liabilities $ 3,009 $ 2,910