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Business Segments (Financial Highlights By Business Segment) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2012 | Jan. 31, 2011 | Jan. 31, 2012 | Jan. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |
Fee revenue | $ 185,951 | $ 186,489 | $ 592,418 |  | $ 546,951 |
Total revenue | 194,623 | 194,109 | 619,201 |  | 570,475 |
Operating income (loss) | 16,165 | 20,492 | 67,514 |  | 59,539 |
Change in fair value of acquisition related contingent consideration |  |  | 2,196 |  | 1,878 |
North America [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Fee revenue | 90,002 | 94,991 | 285,938 |  | 279,032 |
Total revenue | 95,208 | 99,357 | 301,812 |  | 293,125 |
Operating income (loss) | 19,082 | 21,650 | 68,805 |  | 60,920 |
Europe, Middle East And Africa ("EMEA") [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Fee revenue | 40,508 | 40,068 | 124,019 |  | 113,760 |
Total revenue | 42,112 | 41,481 | 128,298 |  | 117,247 |
Operating income (loss) | 5,313 | 3,360 | 16,140 |  | 6,497 |
Asia Pacific [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Fee revenue | 20,938 | 20,445 | 71,879 |  | 65,685 |
Total revenue | 21,553 | 20,967 | 73,658 |  | 67,080 |
Operating income (loss) | 1,638 | 2,487 | 9,343 |  | 7,117 |
South America [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Fee revenue | 8,664 | 7,638 | 25,961 |  | 23,602 |
Total revenue | 8,798 | 7,767 | 26,483 |  | 24,018 |
Operating income (loss) | 2,033 | 1,559 | 6,266 |  | 6,136 |
Subtotal [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Fee revenue | 160,112 | 163,142 | 507,797 |  | 482,079 |
Total revenue | 167,671 | 169,572 | 530,251 |  | 501,470 |
Operating income (loss) | 28,066 | 29,056 | 100,554 |  | 80,670 |
Futurestep [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Fee revenue | 25,839 | 23,347 | 84,621 |  | 64,872 |
Total revenue | 26,952 | 24,537 | 88,950 |  | 69,005 |
Operating income (loss) | 891 | 1,268 | 5,462 |  | 3,440 |
Corporate [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income (loss) | $ (12,792) | $ (9,832) | $ (38,502) | [1] | $ (24,571) | [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 nine months ended January 31, 2012 and 2011, respectively.

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- Definition This element represents the amount of any change, including any differences arising upon settlement, recognized during the reporting period in the value of a liability, arising from an item of contingent consideration, assumed in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e7008-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph b -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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