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Business Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2010
Jul. 31, 2010
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Segment Reporting Information [Line Items]                      
Fee revenue $ 198,087 $ 185,951 $ 200,136 $ 206,331 $ 197,298 $ 186,489 $ 185,350 $ 175,112 $ 790,505 $ 744,249 $ 572,380
Total revenue                 826,759 776,251 599,649
Operating income (loss) 15,352 16,165 25,407 25,942 26,246 20,492 19,775 19,272 82,866 85,785 (2,722)
Depreciation and amortization                 14,017 12,671 11,493
Identifiable assets 1,014,689 [1]       971,680 [1]       1,014,689 [1] 971,680 [1] 827,098 [1]
Long-lived assets 49,808 [1]       43,142 [1]       49,808 [1] 43,142 [1] 24,963 [1]
Goodwill 176,338 [1]       183,952 [1]       176,338 [1] 183,952 [1] 172,273 [1]
Change in fair value of acquisition related contingent consideration                 2,196 4,919  
North America [Member]
                      
Segment Reporting Information [Line Items]                      
Fee revenue                 381,483 375,971 278,746
Total revenue                 402,992 395,008 294,588
Operating income (loss)                 89,424 80,685 42,604
Depreciation and amortization                 6,937 6,465 4,561
Identifiable assets 247,775 [1]       252,122 [1]       247,775 [1] 252,122 [1] 211,728 [1]
Long-lived assets 24,852 [1]       23,690 [1]       24,852 [1] 23,690 [1] 8,918 [1]
Goodwill 91,859 [1]       93,570 [1]       91,859 [1] 93,570 [1] 88,612 [1]
Europe, Middle East And Africa ("EMEA") [Member]
                      
Segment Reporting Information [Line Items]                      
Fee revenue                 164,161 155,782 137,497
Total revenue                 169,652 160,401 141,982
Operating income (loss)                 17,171 11,628 (15,511)
Depreciation and amortization                 2,030 2,036 2,196
Identifiable assets 145,348 [1]       159,134 [1]       145,348 [1] 159,134 [1] 135,165 [1]
Long-lived assets 7,552 [1]       5,330 [1]       7,552 [1] 5,330 [1] 2,960 [1]
Goodwill 50,664 [1]       53,908 [1]       50,664 [1] 53,908 [1] 50,389 [1]
Asia Pacific [Member]
                      
Segment Reporting Information [Line Items]                      
Fee revenue                 95,206 90,346 64,132
Total revenue                 97,599 92,340 65,508
Operating income (loss)                 13,084 11,611 7,826
Depreciation and amortization                 1,412 1,028 1,163
Identifiable assets 79,101 [1]       80,471 [1]       79,101 [1] 80,471 [1] 71,993 [1]
Long-lived assets 4,012 [1]       2,740 [1]       4,012 [1] 2,740 [1] 1,610 [1]
Goodwill 972 [1]       972 [1]       972 [1] 972 [1] 972 [1]
South America [Member]
                      
Segment Reporting Information [Line Items]                      
Fee revenue                 35,759 31,959 24,026
Total revenue                 36,523 32,550 24,536
Operating income (loss)                 8,815 7,475 3,286
Depreciation and amortization                 374 340 439
Identifiable assets 22,957 [1]       21,143 [1]       22,957 [1] 21,143 [1] 21,195 [1]
Long-lived assets 955 [1]       808 [1]       955 [1] 808 [1] 1,041 [1]
Subtotal [Member]
                      
Segment Reporting Information [Line Items]                      
Fee revenue                 676,609 654,058 504,401
Total revenue                 706,766 680,299 526,614
Operating income (loss)                 128,494 111,399 38,205
Depreciation and amortization                 10,753 9,869 8,359
Identifiable assets 495,181 [1]       512,870 [1]       495,181 [1] 512,870 [1] 440,081 [1]
Long-lived assets 37,371 [1]       32,568 [1]       37,371 [1] 32,568 [1] 14,529 [1]
Goodwill 143,495 [1]       148,450 [1]       143,495 [1] 148,450 [1] 139,973 [1]
Futurestep [Member]
                      
Segment Reporting Information [Line Items]                      
Fee revenue                 113,896 90,191 67,979
Total revenue                 119,993 95,952 73,035
Operating income (loss)                 6,245 4,955 1,291
Depreciation and amortization                 1,070 926 1,007
Identifiable assets 90,560 [1]       81,544 [1]       90,560 [1] 81,544 [1] 69,085 [1]
Long-lived assets 3,420 [1]       2,410 [1]       3,420 [1] 2,410 [1] 1,480 [1]
Goodwill 32,843 [1]       35,502 [1]       32,843 [1] 35,502 [1] 32,300 [1]
Corporate [Member]
                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 (51,873) [2] (30,569) [2] (42,218) [1]
Depreciation and amortization                 2,194 [2] 1,876 [2] 2,127 [1]
Identifiable assets 428,948 [1],[2]       377,266 [1],[2]       428,948 [1],[2] 377,266 [1],[2] 317,932 [1]
Long-lived assets $ 9,017 [1],[2]       $ 8,164 [1],[2]       $ 9,017 [1],[2] $ 8,164 [1],[2] $ 8,954 [1]
[1] As of the end of the fiscal year.
[2] The Company recorded an adjustment to the fair value of contingent consideration for a prior acquisition of $2.2 million and $4.9 million during the years ended April 30, 2012 and 2011, respectively.