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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Jul. 31, 2013
Country
Jul. 31, 2012
Apr. 30, 2013
Organization And Summary Of Significant Accounting Policies [Line Items]      
Number of offices 87    
Number of countries in which entity operates 37    
Investments in affiliated companies maximum 50.00%    
Restricted cash $ 0   $ 2,900,000
Realized loss of other-than-temporary impairment 0 0  
Acquisition of a business, contingent consideration 15,000,000    
Impairment of goodwill 0   0
Performance related bonus expenses 31,200,000 26,600,000  
(Decrease) increase in performance related bonus expenses (700,000) (200,000)  
Performance related bonus after reduction in the previous year estimate 30,500,000 26,400,000  
PDI Ninth House
      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Acquisition of a business, contingent consideration $ 15,000,000    
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