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Retirement Benefits - Summary of Change in Projected Benefit Obligations and Change in Fair Value of Plan Assets (Detail)
 12 Months Ended
Apr. 30, 2024
USD ($)
Retirement Benefits [Abstract]  
Accumulated Benefit Obligation, April 30 $ 0
Change in Projected Benefit Obligations  
Projected benefit obligations, beginning of year 18,368,000
Interest cost 890,000
Actuarial gain (loss) 53,000
Actual benefits paid (1,558,000)
Transfer to insurer (17,753,000)
Projected benefit obligations, end of year 0
Change in Plan Assets  
Fair value of plan assets, beginning of year 17,732,000
Actual return on plan assets 1,292,000
Employer contributions 287,000
Actual benefits paid (1,558,000)
Transfer to insurer (17,753,000)
Fair value of plan assets, end of year 0
Funded status—under 0
Amounts Recognized in the Consolidated Balance Sheets consist of:  
Non-current liabilities 0
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) Consist of:  
Net actual loss 0
Deferred tax benefit 0
After-tax actuarial loss $ 0