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Deferred Compensation and Retirement Plans - Additional Information (Detail)
 12 Months Ended
Apr. 30, 2015
USD ($)
Person
Apr. 30, 2014
USD ($)
Person
Apr. 30, 2013
USD ($)
Apr. 30, 2012
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation $ 191,446,000 $ 179,612,000    
Recognized investment income 8,829,000 9,498,000 $ 7,556,000  
Increase in market value of the underlying COLI investments 10,509,000 8,242,000 6,502,000  
Net CSV 102,691,000 94,274,000    
Csv Of Coli Contracts        
Defined Benefit Plan Disclosure [Line Items]        
Gross CSV 172,300,000 167,200,000    
Outstanding policy loans 69,600,000 72,900,000    
Total death benefits payable, net of loans 216,500,000 214,200,000    
Increase in market value of the underlying COLI investments $ 10,509,000 8,242,000 6,502,000  
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      
Total benefit obligation $ 5,262,000 4,424,000 4,536,000 $ 4,214,000
Executive Capital Accumulation Plan        
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation 99,461,000 89,308,000 75,913,000  
Company's contributions $ 19,100,000 17,200,000 20,000,000  
Deferred compensation arrangement vesting period 4 years      
Gain on investment $ 5,871,000 8,884,000 6,300,000  
Company's contributions, unamortized portion 29,700,000 28,300,000    
International Retirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation $ 2,847,000 $ 3,727,000    
Long-term benefit obligation accrued, number of participants | Person 393 383    
Company's contributions $ 500,000 $ 600,000    
Defined Contribution Plan        
Defined Benefit Plan Disclosure [Line Items]        
Company's matching contributions $ 1,600,000 1,200,000 0  
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 $ 72,200,000      
Total death benefits payable, net of loans held in trust 123,800,000      
Deferred Compensation Plan        
Defined Benefit Plan Disclosure [Line Items]        
Deferred compensation and pension plans in periodic benefit expense cost expected to be recognized 2,900,000      
Total benefit obligation $ 83,876,000 $ 82,153,000 $ 85,562,000 $ 78,479,000