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Retirement Benefits - Summary of Change in Projected Benefit Obligations and Change in Fair Value of Plan Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Retirement Benefits [Abstract]    
Accumulated Benefit Obligation, April 30 $ 21,394 $ 21,544
Change in Projected Benefit Obligations    
Projected benefit obligations, beginning of year 21,544 21,313
Interest cost 859 875
Actuarial loss 412 480
Actual benefits paid (1,421) (1,124)
Projected benefit obligations, end of year 21,394 21,544
Change in Plan Assets    
Fair value of plan assets, beginning of year 18,540 17,198
Actual return on plan assets 916 1,866
Employer contributions 1,000 600
Actual benefits paid (1,421) (1,124)
Fair value of plan assets, end of year 19,035 18,540
Funded status—under (2,359) (3,004)
Amounts Recognized in the Consolidated Balance Sheets consist of:    
Noncurrent liabilities (2,359) (3,004)
Amounts recognized in accumulated other comprehensive income (loss) consist of:    
Net actual loss 7,541 7,481
Deferred tax benefit (1,772) (1,825)
After-tax actuarial loss $ 5,769 $ 5,656
Weighted-Average Assumptions Used to Determine Benefit Obligations at April 30    
Discount rate 3.90% 4.10%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended April 30    
Discount rate 3.90% 4.10%
Expected long-term return on plan assets 7.75% 7.75%