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Fee Revenue Classified by Country (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Segment Reporting Information [Line Items]
Fee revenue	$ 271,717	$ 249,545	$ 255,702	$ 251,188	$ 251,712	$ 242,184	$ 237,968	$ 228,437	$ 1,028,152	$ 960,301	$ 812,831
UNITED STATES
Segment Reporting Information [Line Items]
Fee revenue									557,024	507,280	416,987
Other Countries
Segment Reporting Information [Line Items]
Fee revenue									$ 471,128	$ 453,021	$ 395,844

X

- 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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