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Deferred Compensation And Retirement Plans (Narrative) (Detail) (USD $)
 12 Months Ended 12 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Apr. 30, 2012
Enhanced Wealth Accumulation Plan [Member]
Year
Apr. 30, 2012
Senior Executive Incentive Plan [Member]
Year
Apr. 30, 2012
Pension Plan [Member]
Year
Apr. 30, 2011
Pension Plan [Member]
Apr. 30, 2010
Pension Plan [Member]
Apr. 30, 2009
Pension Plan [Member]
Apr. 30, 2012
International Retirement Plans [Member]
Apr. 30, 2011
International Retirement Plans [Member]
Apr. 30, 2012
Executive Capital Accumulation Plan [Member]
Apr. 30, 2011
Executive Capital Accumulation Plan [Member]
Apr. 30, 2010
Executive Capital Accumulation Plan [Member]
Apr. 30, 2012
Defined Contribution Plan [Member]
Apr. 30, 2011
Defined Contribution Plan [Member]
Apr. 30, 2012
Company Owned Life Insurance Held In Trust [Member]
Defined Benefit Plan Disclosure [Line Items]                                  
Participant contribution period towards deferred compensation plans (in years)       8 4                        
Participant after tax contribution period towards deferred compensation plans (in years)       15 15                        
Additional deferred units to acquire (in years)       5                          
Participant employment term, maximum years           20                      
Change in discount rate 4.94% to 3.79% 5.61% to 4.94%                              
Increase in deferred compensation and pension plan liabilities $ 8,800,000 $ 6,700,000                              
Decrease in accumulated other comprehensive income (5,644,000) (4,048,000) (8,728,000)                            
Net increase in deferred income tax assets 3,200,000 2,600,000                              
Total benefit obligation 156,603,000 144,638,000       4,214,000 3,952,000 3,630,000 3,125,000 2,800,000 3,200,000            
Long-term benefit obligation accrued, number of participants                   189 155            
Company's contributions                   500,000 900,000 15,800,000 400,000 1,900,000      
Deferred compensation arrangement vesting terms                       Participants generally vest in Company contributions over a four year period.          
Gain on investment                       884,000 6,667,000 8,900,000      
Company's contributions, unamortized portion                       11,500,000 4,900,000        
Company's matching contributions                               1,200,000  
Percentage contribution by the participants to defined contribution plan                             50.00%    
Gross CSV 151,100,000 143,900,000                              
Outstanding policy loans 73,300,000 72,900,000                              
Total death benefits payable, net of loans 202,900,000 195,700,000                              
Increase in market value of the underlying COLI investments 6,268,000 7,218,000 9,424,000                            
Net CSV 77,848,000 70,987,000                             60,900,000
Total death benefits payable, net of loans held in trust $ 117,200,000