XML 19 R25.htm IDEA: XBRL DOCUMENT v2.4.0.8
Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2014
Office
Country
Oct. 31, 2013
Oct. 31, 2014
Office
Country
Oct. 31, 2013
Apr. 30, 2014
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%    
Deferred revenue $ 35,900,000   $ 35,900,000   $ 36,800,000
Cash equivalents 150,800,000   150,800,000   186,600,000
Realized loss of other-than-temporary impairment 0 0 0 0  
Payment of contingent consideration from acquisitions       15,000,000  
Impairment of goodwill     0   0
Impairment of intangible assets     0   0
Performance related bonus expenses 45,300,000 37,000,000 84,300,000 68,200,000  
(Decrease) increase in performance related bonus expenses 0 0 (300,000) (700,000)  
Performance related bonus after reduction in the previous year estimate     $ 84,000,000 $ 67,500,000  
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