v3.26.1
Deferred Compensation and Retirement Plans - Additional Information (Details)
 12 Months Ended
Apr. 30, 2026
USD ($)
jurisdiction
participant
Apr. 30, 2025
USD ($)
participant
Apr. 30, 2024
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Increase in the fair value of marketable securities $ 31,900,000 $ 17,100,000 $ 29,800,000
Increase in market value of the underlying COLI investments 11,557,000 11,597,000 8,803,000
Net CSV 289,058,000 252,621,000  
CSV of COLI Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Total death benefits payable, net of loans 604,600,000 592,800,000  
Increase in market value of the underlying COLI investments 11,600,000 11,600,000 8,800,000
Net CSV $ 289,100,000 252,600,000  
Minimum | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation range 40.00%    
Minimum | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation range 40.00%    
Maximum | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation range 60.00%    
Maximum | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation range 60.00%    
Long Term Performance Unit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Vesting percentage on each anniversary date 25.00%    
Annual benefit payments per vested unit after anniversary period, option one $ 10,000    
Annual benefit payments per vested unit after anniversary period, option two 12,500    
Annual benefit payments per vested unit after anniversary period, option three $ 25,000    
Number of payments after the seventh anniversary of the grant date 5 years    
Long Term Performance Unit Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Value per unit award $ 25,000    
Long Term Performance Unit Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Value per unit award $ 50,000    
Enhanced Wealth Accumulation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Participant contribution period towards deferred compensation plans 8 years    
Participant after tax contribution period towards deferred compensation plans 15 years    
Additional deferred units to acquire 5 years    
Medical And Life Insurance Benefits | Hay Group      
Defined Benefit Plan Disclosure [Line Items]      
Benefit plan, number of participants | participant 87    
Total benefit obligation $ 3,803,000 4,188,000 4,227,000
International retirement plans      
Defined Benefit Plan Disclosure [Line Items]      
Number of foreign jurisdictions | jurisdiction 25    
Total benefit obligation $ 11,600,000 $ 13,300,000  
Long-term benefit obligation accrued, number of participants | participant 3,823 3,879  
Company's contributions $ 16,900,000 $ 16,700,000  
Executive Capital Accumulation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Total benefit obligation 227,171,000 210,606,000 204,537,000
Company's contributions $ 5,300,000 4,200,000 7,100,000
Deferred compensation arrangement vesting period 5 years    
Deferred compensation plan expense $ 31,087,000 16,585,000 29,500,000
Company's contributions, unamortized portion $ 13,800,000 14,200,000  
Executive Capital Accumulation Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Option to receive employee benefits by quarterly installments periods 1 year    
Executive Capital Accumulation Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Option to receive employee benefits by quarterly installments periods 15 years    
Defined Contribution Plan      
Defined Benefit Plan Disclosure [Line Items]      
Percentage contribution by the participants to defined contribution plan 50.00%    
Employer matching contribution percentage 10.00%    
Company's matching contributions $ 3,400,000 3,400,000 3,500,000
Company's matching contributions next fiscal year 2,900,000    
Company's additional matching contribution 2,700,000 2,400,000  
Deferred Compensation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Total benefit obligation 344,275,000 316,883,000 $ 280,926,000
Deferred Compensation Plan | CSV of COLI Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Gross CSV 361,200,000 325,500,000  
Outstanding policy loans 72,200,000 $ 72,800,000  
Company Owned Life Insurance Held In Trust | CSV of COLI Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Net CSV 251,500,000    
Total death benefits, net of loans held in trust $ 543,100,000