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Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 506,793 | $ 455,468 | $ 985,155 | $ 870,385
Industrial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 144,199 | $ 132,648 | $ 279,963 | $ 254,095
Fee Revenue, Percentage | 29.10% | 29.90% | 29.10% | 30.10%
Financial Services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 92,134 | $ 83,467 | $ 172,327 | $ 150,727
Fee Revenue, Percentage | 18.60% | 18.80% | 17.90% | 17.90%
Life Sciences/ Healthcare |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 82,829 | $ 71,954 | $ 161,997 | $ 138,534
Fee Revenue, Percentage | 16.70% | 16.20% | 16.90% | 16.40%
Consumer Goods |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 78,635 | $ 70,263 | $ 150,429 | $ 132,094
Fee Revenue, Percentage | 15.90% | 15.90% | 15.70% | 15.60%
Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 61,556 | $ 56,298 | $ 123,405 | $ 108,070
Fee Revenue, Percentage | 12.40% | 12.70% | 12.80% | 12.80%
Education/Non-Profit |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 32,011 | $ 25,842 | $ 64,947 | $ 54,519
Fee Revenue, Percentage | 6.50% | 5.80% | 6.80% | 6.50%
General |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 3,841 | $ 2,546 | $ 7,705 | $ 6,233
Fee Revenue, Percentage | 0.80% | 0.70% | 0.80% | 0.70%
Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 495,205 | $ 443,018 | $ 960,773 | $ 844,272
Fee Revenue, Percentage | 100.00% | 100.00% | 100.00% | 100.00%

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