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Fee Revenue Classified by Country (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee revenue | $ 475,364 | $ 447,581 | $ 443,018 | $ 401,254 | $ 406,065 | $ 381,918 | $ 401,917 | $ 375,621 | $ 1,767,217 | $ 1,565,521 | $ 1,292,112
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  | 778,470 | 728,871 | 669,585
Other Countries |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee revenue |  |  |  |  |  |  |  |  | $ 988,747 | $ 836,650 | $ 622,527

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