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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, 2019 | Jul. 31, 2018
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 496,198 | $ 478,362
Industrial |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 139,907 | $ 135,730
Fee Revenue, Percentage | 28.90% | 29.10%
Financial Services |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 86,876 | $ 81,390
Fee Revenue, Percentage | 17.90% | 17.50%
Life Sciences/ Healthcare |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 82,114 | $ 79,160
Fee Revenue, Percentage | 16.90% | 17.00%
Consumer Goods |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 71,833 | $ 71,586
Fee Revenue, Percentage | 14.80% | 15.40%
Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 69,095 | $ 62,819
Fee Revenue, Percentage | 14.30% | 13.50%
Education/Non-Profit |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 30,761 | $ 30,579
Fee Revenue, Percentage | 6.40% | 6.60%
General |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 3,963 | $ 4,304
Fee Revenue, Percentage | 0.80% | 0.90%
Fee Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fee Revenue | $ 484,549 | $ 465,568
Fee Revenue, Percentage | 100.00% | 100.00%

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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