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Retirement Benefits - Summary of Change in Projected Benefit Obligations and Change in Fair Value of Plan Assets (Detail) - USD ($)
 12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Retirement Benefits [Abstract]    
Accumulated Benefit Obligation, April 30 $ 22,942,000 $ 23,720,000
Change in Projected Benefit Obligations    
Projected benefit obligations, beginning of year 23,720,000 21,394,000
Interest cost 723,000 832,000
Actuarial (loss) gain (97,000) 2,769,000
Actual benefits paid (1,404,000) (1,275,000)
Projected benefit obligations, end of year 22,942,000 23,720,000
Change in Plan Assets    
Fair value of plan assets, beginning of year 17,316,000 19,035,000
Actual return on plan assets 5,517,000 (444,000)
Employer contributions 30,000 0
Actual benefits paid (1,404,000) (1,275,000)
Fair value of plan assets, end of year 21,459,000 17,316,000
Funded status—under (1,483,000) (6,404,000)
Amounts Recognized in the Consolidated Balance Sheets consist of:    
Non-current liabilities (1,483,000) (6,404,000)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) Consist of:    
Net actual loss 5,089,000 11,133,000
Deferred tax benefit (1,196,000) (2,616,000)
After-tax actuarial loss $ 3,893,000 $ 8,517,000
Weighted-Average Assumptions Used to Determine Benefit Obligations at April 30    
Discount rate 3.20% 3.10%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended April 30    
Discount rate 3.20% 3.10%
Expected long-term return on plan assets (as a percent) 7.75% 7.75%