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Fee Revenue Classified by Country (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue | $ 251,712 | $ 242,184 | $ 237,968 | $ 228,437 | $ 227,902 | [1] | $ 202,004 | $ 196,231 | $ 186,694 | $ 960,301 | $ 812,831 | $ 790,505
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  |  | 507,280 | 416,987 | 383,955
Other Countries |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  |  | $ 453,021 | $ 395,844 | $ 406,550
[1] | During the three months ended April 30, 2013, the Company implemented a restructuring plan to continue to integrate PDI in order to eliminate redundant positions and consolidate premises. This resulted in restructuring charges, net of recoveries of $2.9 million against operations during the three months ended April 30, 2013.

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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