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Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee Revenue |  |  |  |  |  |  |  |  | $ 1,973,862 | $ 1,819,519 | $ 1,621,669
Industrial |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee Revenue |  |  |  |  |  |  |  |  | $ 561,029 | $ 530,547 | $ 459,732
Fee Revenue, Percentage |  |  |  |  |  |  |  |  | 29.10% | 30.00% | 29.40%
Financial Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee Revenue |  |  |  |  |  |  |  |  | $ 349,968 | $ 305,047 | $ 257,671
Fee Revenue, Percentage |  |  |  |  |  |  |  |  | 18.20% | 17.30% | 16.40%
Life Sciences/ Healthcare |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee Revenue |  |  |  |  |  |  |  |  | $ 323,091 | $ 294,999 | $ 273,493
Fee Revenue, Percentage |  |  |  |  |  |  |  |  | 16.80% | 16.70% | 17.50%
Consumer Goods |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee Revenue |  |  |  |  |  |  |  |  | $ 297,676 | $ 276,979 | $ 263,671
Fee Revenue, Percentage |  |  |  |  |  |  |  |  | 15.50% | 15.70% | 16.80%
Technology |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee Revenue |  |  |  |  |  |  |  |  | $ 260,918 | $ 226,142 | $ 198,867
Fee Revenue, Percentage |  |  |  |  |  |  |  |  | 13.50% | 12.80% | 12.70%
Education/Non-Profit |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee Revenue |  |  |  |  |  |  |  |  | $ 122,524 | $ 120,809 | $ 99,978
Fee Revenue, Percentage |  |  |  |  |  |  |  |  | 6.30% | 6.80% | 6.40%
General |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee Revenue |  |  |  |  |  |  |  |  | $ 10,827 | $ 12,694 | $ 12,109
Fee Revenue, Percentage |  |  |  |  |  |  |  |  | 0.60% | 0.70% | 0.80%
Fee Revenue |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee Revenue | $ 490,756 | $ 474,504 | $ 495,205 | $ 465,568 | $ 475,364 | $ 447,581 | $ 443,018 | $ 401,254 | $ 1,926,033 | $ 1,767,217 | $ 1,565,521
Fee Revenue, Percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%

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