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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, 2019 | Oct. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 504,177 | $ 506,793 | $ 1,000,375 | $ 985,155
Industrial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 139,010 | $ 143,969 | $ 278,917 | $ 279,699
Fee Revenue, Percentage | 28.20% | 29.10% | 28.50% | 29.10%
Financial Services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 85,457 | $ 93,015 | $ 172,333 | $ 174,405
Fee Revenue, Percentage | 17.40% | 18.80% | 17.60% | 18.20%
Life Sciences/ Healthcare |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 88,807 | $ 83,611 | $ 170,921 | $ 162,771
Fee Revenue, Percentage | 18.00% | 16.90% | 17.50% | 16.90%
Consumer Goods |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 75,227 | $ 79,076 | $ 147,060 | $ 150,662
Fee Revenue, Percentage | 15.30% | 15.90% | 15.10% | 15.70%
Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 70,355 | $ 60,148 | $ 139,450 | $ 122,967
Fee Revenue, Percentage | 14.30% | 12.10% | 14.30% | 12.80%
Education/Non-Profit |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 29,702 | $ 31,061 | $ 60,463 | $ 61,640
Fee Revenue, Percentage | 6.00% | 6.30% | 6.20% | 6.40%
General |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 3,831 | $ 4,325 | $ 7,794 | $ 8,629
Fee Revenue, Percentage | 0.80% | 0.90% | 0.80% | 0.90%
Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 492,389 | $ 495,205 | $ 976,938 | $ 960,773
Fee Revenue, Percentage | 100.00% | 100.00% | 100.00% | 100.00%

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