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Organization And Summary Of Significant Accounting Policies (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2011
Oct. 31, 2010
Apr. 30, 2011
Organization And Summary Of Significant Accounting Policies [Abstract]          
Number of offices 76   76    
Number of countries 36   36    
Investments in affiliated companies maximum 50.00%   50.00%    
Restricted cash $ 10,000,000   $ 10,000,000   $ 10,000,000
Realized loss of other than temporary impairment 0 0 0 0  
Reduction in the estimated fair value of contingent consideration relating to prior acquisition 1,878,000 2,196,000 2,196,000 1,878,000  
Impairment of goodwill     0   0
Impairment of intangible assets     0   0
Estimated useful life, minimum (years)     5    
Estimated useful life, maximum (years)     24    
Performance related bonus expenses     60,900,000 68,100,000  
Increase (decrease) in performance related bonus expenses 0 0 (1,200,000) (2,000,000)  
Performance related bonus after reduction in the previous year estimate 28,200,000 34,100,000 59,700,000 66,100,000  
2010 deferred performance related bonus $ 5,400,000   $ 5,400,000