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Business Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Segment Reporting Information [Line Items]        
Fee revenue $ 196,231 $ 200,136 $ 382,925 $ 406,467
Segment income (loss) 18,264 25,407 35,273 51,349
Restructuring charges, net 15,495   15,495  
Operating income (loss) 2,769 25,407 19,778 51,349
North America
        
Segment Reporting Information [Line Items]        
Fee revenue 69,441 77,525 141,547 157,449
Segment income (loss) 14,453 21,291 32,527 42,816
Restructuring charges, net 5,436   5,436  
Operating income (loss) 9,017   27,091  
EMEA
        
Segment Reporting Information [Line Items]        
Fee revenue 33,142 35,408 62,965 74,239
Segment income (loss) 3,823 5,028 5,611 10,032
Restructuring charges, net 4,752   4,752  
Operating income (loss) (929)   859  
Asia Pacific
        
Segment Reporting Information [Line Items]        
Fee revenue 18,338 21,827 35,721 44,323
Segment income (loss) 1,693 3,590 2,191 7,461
Restructuring charges, net 613   613  
Operating income (loss) 1,080   1,578  
South America
        
Segment Reporting Information [Line Items]        
Fee revenue 6,827 7,707 14,961 15,948
Segment income (loss) 1,217 2,215 3,306 4,885
Operating income (loss) 1,217   3,306  
Subtotal
        
Segment Reporting Information [Line Items]        
Fee revenue 127,748 142,467 255,194 291,959
Segment income (loss) 21,186 32,124 43,635 65,194
Restructuring charges, net 10,801   10,801  
Operating income (loss) 10,385   32,834  
Leadership and Talent Consulting Services
        
Segment Reporting Information [Line Items]        
Fee revenue 38,452 29,085 66,844 55,726
Segment income (loss) 6,929 4,227 11,191 6,194
Restructuring charges, net 677   677  
Operating income (loss) 6,252   10,514  
Futurestep
        
Segment Reporting Information [Line Items]        
Fee revenue 30,031 28,584 60,887 58,782
Segment income (loss) 3,323 2,815 6,505 5,671
Restructuring charges, net 3,086   3,086  
Operating income (loss) 237   3,419  
Corporate
        
Segment Reporting Information [Line Items]        
Segment income (loss) (13,174) (13,759) (26,058) (25,710)
Restructuring charges, net 931   931  
Operating income (loss) $ (14,105)   $ (26,989)