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Business Segments (Financial Highlights By Business Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2011
Oct. 31, 2010
Fee revenue $ 200,136 $ 185,350 $ 406,467 $ 360,462
Total revenue 209,988 193,204 424,578 376,366
Operating income (loss) 25,407 19,775 51,349 39,047
Change in fair value of acquisition related contingent consideration 1,878 2,196 2,196 1,878
North America [Member]
        
Fee revenue 97,511 94,066 195,936 184,041
Total revenue 103,418 98,703 206,604 193,768
Operating income (loss) 25,697 19,595 49,723 39,270
EMEA [Member]
        
Fee revenue 40,269 37,424 83,511 73,692
Total revenue 41,660 38,628 86,186 75,766
Operating income (loss) 5,483 84 10,827 3,137
Asia Pacific [Member]
        
Fee revenue 25,266 24,098 50,941 45,240
Total revenue 25,894 24,510 52,105 46,113
Operating income (loss) 3,771 1,561 7,705 4,630
South America [Member]
        
Fee revenue 8,506 8,478 17,297 15,964
Total revenue 8,688 8,633 17,685 16,251
Operating income (loss) 1,950 2,698 4,233 4,577
Subtotal [Member]
        
Fee revenue 171,552 164,066 347,685 318,937
Total revenue 179,660 170,474 362,580 331,898
Operating income (loss) 36,901 23,938 72,488 51,614
Futurestep [Member]
        
Fee revenue 28,584 21,284 58,782 41,525
Total revenue 30,328 22,730 61,998 44,468
Operating income (loss) 2,265 1,183 4,571 2,172
Corporate [Member]
        
Operating income (loss) $ (13,759) [1] $ (5,346) [1] $ (25,710) [1] $ (14,739) [1]
[1] The Company recorded an adjustment to the fair value of contingent consideration for a prior acquisition, of $2.2 million and $1.9 million during the three and six months ended October 31, 2011 and 2010, respectively.