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Goodwill And Intangible Assets (Changes In Carrying Value Of Goodwill By Reportable Segment) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Goodwill [Line Items]      
Goodwill, Beginning Balance $ 183,952 [1] $ 172,273 [1]  
Additions 343    
Additions   3,000 2,800
Deletion (586) [2]    
Exchange rate fluctuations (7,371) 8,679  
Goodwill, Ending Balance 176,338 [1] 183,952 [1] 172,273 [1]
North America [Member]
      
Goodwill [Line Items]      
Goodwill, Beginning Balance 93,570 [1] 88,612 [1]  
Additions   3,000  
Deletion (586) [2]    
Exchange rate fluctuations (1,125) 1,958  
Goodwill, Ending Balance 91,859 [1] 93,570 [1]  
Europe, Middle East And Africa ("EMEA") [Member]
      
Goodwill [Line Items]      
Goodwill, Beginning Balance 53,908 [1] 50,389 [1]  
Exchange rate fluctuations (3,244) 3,519  
Goodwill, Ending Balance 50,664 [1] 53,908 [1]  
Asia Pacific [Member]
      
Goodwill [Line Items]      
Goodwill, Ending Balance 972 [1] 972 [1] 972 [1]
Subtotal [Member]
      
Goodwill [Line Items]      
Goodwill, Beginning Balance 148,450 [1] 139,973 [1]  
Additions   3,000  
Deletion (586) [2]    
Exchange rate fluctuations (4,369) 5,477  
Goodwill, Ending Balance 143,495 [1] 148,450 [1]  
Futurestep [Member]
      
Goodwill [Line Items]      
Goodwill, Beginning Balance 35,502 [1] 32,300 [1]  
Additions 343    
Exchange rate fluctuations (3,002) 3,202  
Goodwill, Ending Balance $ 32,843 [1] $ 35,502 [1]  
[1] As of the end of the fiscal year.
[2] During fiscal 2012, the Company sold a majority interest in a previously consolidated subsidiary, requiring the Company to deconsolidate the subsidiary and reduce goodwill by $0.6 million