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Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Apr. 30, 2015
USD ($)
Country
Office
Apr. 30, 2014
USD ($)
Apr. 30, 2013
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]      
Number of offices | Office 78    
Number of countries in which entity operates | Country 37    
Investments in affiliated companies maximum 50.00%    
Dividends received from unconsolidated subsidiary $ 1,656,000 $ 2,120,000 $ 1,897,000
Deferred revenue 40,500,000 36,800,000  
Cash equivalents 260,600,000 186,600,000  
Realized loss of other-than-temporary impairment 0 0 0
Payment of contingent consideration from acquisitions   15,000,000  
Impairment Charges 0 0 0
Impairment of goodwill 0    
Impairment of intangible assets 0 0  
Performance related bonus expenses 166,700,000 146,100,000 114,100,000
(Decrease) increase in performance related bonus expenses (300,000) (700,000) (200,000)
Performance related bonus after reduction in the previous year estimate 166,400,000 145,400,000 113,900,000
Foreign currency losses/(gains), after tax $ 1,600,000 (1,000,000) $ 500,000
Minimum      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Intangible assets estimated useful lives 1 year    
Maximum      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Intangible assets estimated useful lives 24 years    
Csv Of Coli Contracts      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Gross CSV $ 172,300,000 167,200,000  
Outstanding policy loans 69,600,000 72,900,000  
Receivable on insolvency of insurance companies $ 50,600,000 $ 45,900,000  
Executive Capital Accumulation Plan      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Deferred compensation arrangement vesting period 4 years    
Software and Software Development Costs | Minimum      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Property and equipment, estimated useful life, maximum 3 years    
Software and Software Development Costs | Maximum      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Property and equipment, estimated useful life, maximum 7 years    
Other Capitalized Property Plant and Equipment | Minimum      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Property and equipment, estimated useful life, maximum 3 years    
Other Capitalized Property Plant and Equipment | Maximum      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Property and equipment, estimated useful life, maximum 10 years