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Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2018 | Jul. 31, 2017
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 478,362 | $ 414,917
Industrial |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 135,764 | $ 121,447
Fee Revenue, Percentage | 29.20% | 30.30%
Financial Services |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 80,193 | $ 67,260
Fee Revenue, Percentage | 17.20% | 16.80%
Life Sciences/Healthcare |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 79,169 | $ 66,580
Fee Revenue, Percentage | 17.00% | 16.60%
Consumer Goods |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 71,794 | $ 61,831
Fee Revenue, Percentage | 15.40% | 15.40%
Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 61,849 | $ 51,772
Fee Revenue, Percentage | 13.30% | 12.90%
Education |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 32,936 | $ 28,677
Fee Revenue, Percentage | 7.10% | 7.10%
General |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 3,863 | $ 3,687
Fee Revenue, Percentage | 0.80% | 0.90%
Fee Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 465,568 | $ 401,254
Fee Revenue, Percentage | 100.00% | 100.00%

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