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Business Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Segment Reporting Information [Line Items]    
Fee revenue $ 186,694 $ 206,331
Total revenue 196,023 214,590
Operating income (loss) 17,009 25,942
North America
    
Segment Reporting Information [Line Items]    
Fee revenue 72,106 79,924
Total revenue 76,227 84,125
Operating income (loss) 18,074 21,525
EMEA
    
Segment Reporting Information [Line Items]    
Fee revenue 29,823 38,831
Total revenue 30,870 40,006
Operating income (loss) 1,788 5,004
Asia Pacific
    
Segment Reporting Information [Line Items]    
Fee revenue 17,383 22,496
Total revenue 17,873 22,963
Operating income (loss) 498 3,871
South America
    
Segment Reporting Information [Line Items]    
Fee revenue 8,134 8,241
Total revenue 8,251 8,429
Operating income (loss) 2,089 2,670
Subtotal
    
Segment Reporting Information [Line Items]    
Fee revenue 127,446 149,492
Total revenue 133,221 155,523
Operating income (loss) 22,449 33,070
Leadership and Talent Consulting Services
    
Segment Reporting Information [Line Items]    
Fee revenue 28,392 26,641
Total revenue 29,844 27,397
Operating income (loss) 4,262 1,967
Futurestep
    
Segment Reporting Information [Line Items]    
Fee revenue 30,856 30,198
Total revenue 32,958 31,670
Operating income (loss) 3,182 2,856
Corporate
    
Segment Reporting Information [Line Items]    
Operating income (loss) $ (12,884) $ (11,951)