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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, 2020 | Oct. 31, 2019 | Oct. 31, 2020 | Oct. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 437,789 | $ 504,177 | $ 784,672 | $ 1,000,375
Industrial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 119,380 | $ 141,066 | $ 214,691 | $ 279,378
Fee Revenue, Percentage | 27.40% | 28.60% | 27.60% | 28.60%
Financial Services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 82,918 | $ 85,188 | $ 148,645 | $ 171,400
Fee Revenue, Percentage | 19.00% | 17.30% | 19.10% | 17.50%
Life Sciences/Healthcare |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 83,413 | $ 89,085 | $ 148,863 | $ 171,350
Fee Revenue, Percentage | 19.20% | 18.10% | 19.10% | 17.50%
Consumer Goods |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 60,737 | $ 75,712 | $ 105,515 | $ 147,410
Fee Revenue, Percentage | 13.90% | 15.40% | 13.50% | 15.10%
Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 64,691 | $ 70,499 | $ 114,015 | $ 141,302
Fee Revenue, Percentage | 14.90% | 14.30% | 14.60% | 14.50%
Education/Non-Profit/General |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 24,300 | $ 30,839 | $ 47,807 | $ 66,098
Fee Revenue, Percentage | 5.60% | 6.30% | 6.10% | 6.80%
Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fee Revenue | $ 435,439 | $ 492,389 | $ 779,536 | $ 976,938
Fee Revenue, Percentage | 100.00% | 100.00% | 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 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: 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=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: 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=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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