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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2014
Office
Country
Jul. 31, 2013
Jan. 31, 2013
Jul. 31, 2012
Jan. 31, 2014
Office
Country
Jan. 31, 2013
Apr. 30, 2013
Organization And Summary Of Significant Accounting Policies [Line Items]              
Number of offices 87       87    
Number of countries in which entity operates 37       37    
Investments in affiliated companies maximum 50.00%       50.00%    
Restricted cash $ 0       $ 0   $ 2,900,000
Realized loss of other-than-temporary impairment 0   0   0 0  
Acquisition of a business, contingent consideration         15,000,000    
Impairment of goodwill         0   0
Impairment of intangible assets         0   0
Performance related bonus expenses         104,700,000 82,000,000  
(Decrease) increase in performance related bonus expenses 0 (700,000) 0 (200,000)      
Performance related bonus after reduction in the previous year estimate 36,500,000   28,000,000   104,000,000 81,800,000  
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