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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.

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