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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Apr. 30, 2014
Office
Country
Apr. 30, 2014
Office
Country
Apr. 30, 2013
Apr. 30, 2012
Organization And Summary Of Significant Accounting Policies [Line Items]        
Number of offices 84 84    
Number of countries in which entity operates 37 37    
Investments in affiliated companies maximum 50.00% 50.00%    
Dividends received from unconsolidated subsidiary   $ 2,120,000 $ 1,897,000 $ 1,669,000
Deferred revenue 36,800,000 36,800,000 33,800,000  
Cash equivalents 186,600,000 186,600,000 93,600,000  
Restricted cash 0 0 2,900,000  
Realized loss of other-than-temporary impairment   0 0 0
Reduction in the estimated fair value of contingent consideration relating to prior acquisition       (2,196,000)
Payment of contingent consideration from acquisitions   15,000,000    
Impairment of goodwill 0 0    
Intangible assets estimated useful lives   11 years    
Impairment of intangible assets   0 0  
Performance related bonus expenses   146,100,000 114,100,000 116,800,000
(Decrease) increase in performance related bonus expenses   (700,000) (200,000) (1,200,000)
Performance related bonus after reduction in the previous year estimate   145,400,000 113,900,000 115,600,000
Foreign currency losses/(gains), after tax   (1,000,000) 500,000 1,600,000
Minimum
        
Organization And Summary Of Significant Accounting Policies [Line Items]        
Intangible assets estimated useful lives   2 years    
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 167,200,000 167,200,000 159,200,000  
Outstanding policy loans 72,900,000 72,900,000 73,300,000  
Receivable on insolvency of insurance companies $ 45,900,000 $ 45,900,000 $ 40,500,000  
Executive Capital Accumulation Plan
        
Organization And Summary Of Significant Accounting Policies [Line Items]        
Deferred compensation arrangement vesting terms   The Company amortizes these contributions on a straight-line basis as they vest, generally over a four year period.    
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