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Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2010
Business Acquisition [Line Items] |  |  |  |  |
Assets acquired | $ 137 | [1],[2] |  | $ 14,055 | [1],[3]
Intangibles acquired |  |  |  | 6,835 | [1],[3]
Liabilities acquired | 38 | [1],[2] |  | 22,958 | [1],[3]
Net assets (liabilities) acquired | 99 | [1],[2] |  | (2,068) | [1],[3]
Purchase price | 442 | [1],[2] |  | 25,848 | [1],[3]
Goodwill | 343 | [1],[2] |  | 27,916 | [1],[3]
Earn-out payments eligible by the employees | 1,900 |  |  |  |
Additional accrual of earn-out payments |  |  | 3,000 | 2,800 |
Executive Recruitment [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  |  | 27,916 | [1],[3]
Futurestep [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 343 | [1],[2] |  |  |
[1] | Certain employees who joined the Company through these acquisitions will be eligible to receive earn-out payments of up to $1.9 million over the next year, if certain financial metrics are achieved during that period. The Company does not expect that these financial metrics will be achieved and have not recorded an accrual as of the year ended April 30, 2012. Any amount of the earn-out that is achieved will be recorded when the earn-out is earned. The Company accrued an additional $3.0 million and $2.8 million in fiscal 2011 and 2010, respectively, related to acquisitions occurring in previous years, all of which was paid in fiscal 2011.
[2] | On March 1, 2012, the Company purchased Avature USA Recruiting Business and Avature Argentina Recruiting Business. Avature USA Recruiting Business and Avature Argentina Recruiting Business are engaged in providing back-office functions including, database candidate searching, data processing, filling forms, call-center activities, and other administrative functions. As a result of these acquisitions, the Company obtained the rights to certain client contracts from Avature USA, license agreements to use the Customer Relationship Management software, employees of Avature Argentina engaged in the recruiting business and the office lease and equipment in Argentina used in the recruiting business. Actual results of operations of Avature USA Recruiting Business and Avature Argentina Recruiting Business are included in the Company's consolidated financial statements from March 1, 2012, the effective date of the acquisition.
[3] | On June 11, 2009, the Company acquired all of the outstanding share capital of WHM, to provide the Company with a larger executive recruitment presence in EMEA. WHM is engaged in providing executive recruitment and other related recruiting services in the United Kingdom and France. Actual results of operations of WHM are included in the Company's consolidated financial statements from June 11, 2009, the effective date of the acquisition.

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