Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies - Additional Information (Detail)

v3.2.0.727
Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Jul. 31, 2015
USD ($)
Country
Office
Jul. 31, 2014
USD ($)
Apr. 30, 2015
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%    
Deferred revenue $ 39,500,000   $ 40,500,000
Cash equivalents 168,800,000   260,600,000
Realized loss of other-than-temporary impairment 0 $ 0  
Impairment of goodwill 0   0
Impairment of intangible assets 0   $ 0
Performance related bonus expenses 42,400,000 39,000,000  
(Decrease) increase in performance related bonus expenses (600,000) (300,000)  
Performance related bonus after reduction in the previous year estimate $ 41,800,000 $ 38,700,000  
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