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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

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