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Fee Revenue Classified by Country (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee revenue | $ 406,065 | $ 381,918 | $ 401,917 | $ 375,621 | $ 399,960 | $ 344,158 | $ 280,600 | $ 267,394 | $ 1,565,521 | $ 1,292,112 | $ 1,028,152
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  | 728,871 | 669,585 | 557,024
Other Countries |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  | $ 836,650 | $ 622,527 | $ 471,128

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