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Fee Revenue Classified by Country (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended									12 Months Ended
	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

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