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Fee Revenue - Schedule of Disaggregation of Fee Revenue by Industry (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2019 | Jan. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 486,172 | $ 460,770 | $ 1,471,327 | $ 1,331,155
Industrial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 137,436 | $ 134,512 | $ 419,559 | $ 388,607
Fee Revenue, Percentage | 29.00% | 30.10% | 29.20% | 30.10%
Financial Services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 86,397 | $ 74,044 | $ 259,962 | $ 224,771
Fee Revenue, Percentage | 18.20% | 16.60% | 18.10% | 17.40%
Life Sciences/ Healthcare |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 76,066 | $ 76,237 | $ 239,891 | $ 214,771
Fee Revenue, Percentage | 16.00% | 17.00% | 16.70% | 16.60%
Consumer Goods |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 74,007 | $ 72,229 | $ 226,159 | $ 204,323
Fee Revenue, Percentage | 15.60% | 16.10% | 15.80% | 15.80%
Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 64,248 | $ 57,823 | $ 188,088 | $ 165,893
Fee Revenue, Percentage | 13.60% | 12.90% | 13.10% | 12.80%
Education/Non-Profit |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 29,083 | $ 30,019 | $ 91,250 | $ 84,538
Fee Revenue, Percentage | 6.10% | 6.70% | 6.40% | 6.60%
General |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 7,267 | $ 2,717 | $ 10,368 | $ 8,950
Fee Revenue, Percentage | 1.50% | 0.60% | 0.70% | 0.70%
Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 474,504 | $ 447,581 | $ 1,435,277 | $ 1,291,853
Fee Revenue, Percentage | 100.00% | 100.00% | 100.00% | 100.00%

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