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Deferred Compensation and Retirement Plans - Additional Information (Detail) (USD $)
12 Months Ended 12 Months Ended 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2014
Csv Of Coli Contracts
Apr. 30, 2013
Csv Of Coli Contracts
Apr. 30, 2014
Enhanced Wealth Accumulation Plan
Apr. 30, 2014
Senior Executive Incentive Plan
Apr. 30, 2014
Pension Plans, Defined Benefit
Apr. 30, 2013
Pension Plans, Defined Benefit
Apr. 30, 2012
Pension Plans, Defined Benefit
Apr. 30, 2011
Pension Plans, Defined Benefit
Apr. 30, 2014
Executive Capital Accumulation Plan
Apr. 30, 2013
Executive Capital Accumulation Plan
Apr. 30, 2012
Executive Capital Accumulation Plan
Apr. 30, 2014
International Retirement Plans
Person
Apr. 30, 2013
International Retirement Plans
Person
Apr. 30, 2014
Defined Contribution Plan
Apr. 30, 2013
Defined Contribution Plan
Apr. 30, 2012
Defined Contribution Plan
Apr. 30, 2014
Company Owned Life Insurance Held In Trust
Csv Of Coli Contracts
Apr. 30, 2014
Deferred Compensation Plan
Apr. 30, 2013
Deferred Compensation Plan
Apr. 30, 2012
Deferred Compensation Plan
Apr. 30, 2011
Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]                                                
Participant contribution period towards deferred compensation plans (in years)           8 years 4 years                                  
Participant after tax contribution period towards deferred compensation plans (in years)           15 years 15 years                                  
Additional deferred units to acquire (in years)           5 years                                    
Participant employment term, maximum years               20 years                                
Deferred compensation and pension plans in periodic benefit expense cost expected to be recognized                                         $ 3,100,000      
Total benefit obligation 179,612,000 169,657,000           4,424,000 4,536,000 4,214,000 3,952,000 89,308,000 75,913,000 71,134,000 3,727,000 3,646,000         82,153,000 85,562,000 78,479,000 70,319,000
Long-term benefit obligation accrued, number of participants                             267 221                
Company's contributions                       17,200,000 20,000,000 15,800,000 500,000 1,100,000                
Deferred compensation arrangement vesting terms                       The Company amortizes these contributions on a straight-line basis as they vest, generally over a four year period.                        
Gain on investment                       8,884,000 6,281,000 900,000                    
Recognized investment income 9,498,000 7,556,000 1,013,000                                          
Company's contributions, unamortized portion                       28,300,000 23,300,000                      
Company's matching contributions                                 1,200,000 0 0          
Percentage contribution by the participants to defined contribution plan                                 50.00%              
Gross CSV       167,200,000 159,200,000                                      
Outstanding policy loans       72,900,000 73,300,000                                      
Total death benefits payable, net of loans       214,200,000 212,700,000                                      
Increase in market value of the underlying COLI investments 8,242,000 6,502,000 6,268,000 8,242,000 6,502,000                                      
Net CSV 94,274,000 85,873,000                                   68,100,000        
Total death benefits payable, net of loans held in trust                                       $ 122,600,000