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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2025 | Apr. 30, 2024
Intangible Assets [Line Items] |  |
Gross | $ 284,493 | $ 278,451
Accumulated Amortization | (214,472) | (189,496)
Net | 70,021 | 88,955
Exchange rate fluctuations | 172 | (122)
Amortized intangible assets, net | 70,193 | 88,833
Intangible asset addition | 6,000 | 0
Customer lists |  |
Intangible Assets [Line Items] |  |
Gross | 197,370 | 192,099
Accumulated Amortization | (139,957) | (121,977)
Net | 57,413 | 70,122
Intellectual property |  |
Intangible Assets [Line Items] |  |
Gross | 69,100 | 69,100
Accumulated Amortization | (58,421) | (52,804)
Net | 10,679 | 16,296
Trademarks |  |
Intangible Assets [Line Items] |  |
Gross | 12,857 | 12,086
Accumulated Amortization | (10,928) | (9,549)
Net | 1,929 | 2,537
Proprietary databases |  |
Intangible Assets [Line Items] |  |
Gross | 4,256 | 4,256
Accumulated Amortization | (4,256) | (4,256)
Net | 0 | 0
Non-compete agreements |  |
Intangible Assets [Line Items] |  |
Gross | 910 | 910
Accumulated Amortization | (910) | (910)
Net | $ 0 | $ 0

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