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Deferred Compensation and Retirement Plans - Additional Information (Detail)
 12 Months Ended
Apr. 30, 2018
USD ($)
Person
Apr. 30, 2017
USD ($)
Person
Apr. 30, 2016
USD ($)
Dec. 01, 2015
Person
Defined Benefit Plan Disclosure [Line Items]        
Recognized investment income(expense) $ 10,278,000 $ 10,842,000 $ (3,333,000)  
Increase in market value of the underlying COLI investments 7,776,000 4,918,000 3,984,000  
Net CSV 120,087,000 113,067,000    
Long Term Performance Unit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Value per unit award 50,000      
Annual Benefit Payments per vested unit after anniversary period $ 25,000      
Number of payments after the seventh anniversary of the grant date 5 years      
Vesting percentage on each anniversary date 25.00%      
CSV of COLI Contracts        
Defined Benefit Plan Disclosure [Line Items]        
Gross CSV $ 186,800,000 180,300,000    
Outstanding policy loans 66,700,000 67,200,000    
Total death benefits payable, net of loans 226,000,000 220,600,000    
Increase in market value of the underlying COLI investments $ 7,800,000 4,900,000 4,000,000  
Equity Securities | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation range 40.00%      
Equity Securities | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation range 50.00%      
Debt Securities | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation range 45.00%      
Debt Securities | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation range 55.00%      
Other Assets | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation range 5.00%      
Other Assets | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation range 10.00%      
Enhanced Wealth Accumulation Plan        
Defined Benefit Plan Disclosure [Line Items]        
Participant contribution period towards deferred compensation plans (in years) 8 years      
Participant after tax contribution period towards deferred compensation plans (in years) 15 years      
Additional deferred units to acquire (in years) 5 years      
Senior Executive Incentive Plan        
Defined Benefit Plan Disclosure [Line Items]        
Participant contribution period towards deferred compensation plans (in years) 4 years      
Participant after tax contribution period towards deferred compensation plans (in years) 15 years      
Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Participant employment term, maximum years 20 years      
Deferred Compensation Plan        
Defined Benefit Plan Disclosure [Line Items]        
Deferred compensation and pension plans in periodic benefit expense cost expected to be recognized $ 1,800,000      
Total benefit obligation 126,494,000 121,042,000 124,566,000  
Deferred Compensation Plan | CSV of COLI Contracts        
Defined Benefit Plan Disclosure [Line Items]        
Gross CSV 186,800,000 180,300,000    
Outstanding policy loans 66,700,000 67,200,000    
Medical and Life Insurance plan        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit income expected to be recognized (300,000)      
Medical and Life Insurance plan | Legacy Hay        
Defined Benefit Plan Disclosure [Line Items]        
Benefit plan, number of participants | Person       128
Reduction in benefit obligation $ (4,008,000)      
Defined benefit plan ultimate health care cost trend rate 5.00%      
Defined benefit plan year that rate reaches ultimate trend rate 2022      
Defined benefit plan effect of one percentage point increase on accumulated postretirement benefit obligation $ 100,000      
Defined benefit plan effect of one percentage point decrease on accumulated postretirement benefit obligation 100,000      
Total benefit obligation 7,157,000 12,147,000 13,006,000  
International Retirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation $ 13,700,000 $ 12,000,000    
Long-term benefit obligation accrued, number of participants | Person 1,999 1,710    
Company's contributions $ 10,700,000 $ 9,300,000    
Executive Capital Accumulation Plan        
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation 128,430,000 111,584,000 105,676,000  
Company's contributions 6,200,000 6,200,000 23,200,000  
Gain (loss) on deferred compensation plan 11,100,000 10,600,000 $ (1,700,000)  
Company's contributions, unamortized portion $ 19,200,000 25,500,000    
Executive Capital Accumulation Plan | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Deferred compensation arrangement vesting period 4 years      
Executive Capital Accumulation Plan | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Deferred compensation arrangement vesting period 5 years      
Defined Contribution Plan        
Defined Benefit Plan Disclosure [Line Items]        
Company's matching contributions $ 2,300,000 $ 1,800,000    
Percentage contribution by the participants to defined contribution plan 50.00%      
Company Owned Life Insurance Held In Trust | CSV of COLI Contracts        
Defined Benefit Plan Disclosure [Line Items]        
Net CSV $ 81,500,000      
Total death benefits, net of loans held in trust $ 150,400,000