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Fee Revenue - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2018 | Jul. 31, 2017
Disaggregation Of Revenue [Line Items] |  |
Total revenue | $ 478,362 | $ 414,917
Contract liabilities, revenue recognized | $ 66,500 |
Revenue, practical expedient, initial application and transition, completed contract, same reporting period | true |
Revenue, remaining performance obligation, optional exemption, performance obligation | true |
Adjustments Due to ASC 606 | Accounting Standards Update 2014-09 |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | $ 200 |

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