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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2024 | Apr. 30, 2023
Intangible Assets [Line Items] |  |
Gross | $ 278,451,000 | $ 278,451,000
Accumulated Amortization | (189,496,000) | (163,905,000)
Net | 88,955,000 | 114,546,000
Exchange rate fluctuations | (122,000) | (120,000)
Amortized intangible assets, net | 88,833,000 | 114,426,000
Intangible asset addition | 0 |
ICS |  |
Intangible Assets [Line Items] |  |
Intangible asset addition |  | 16,400,000
Salo |  |
Intangible Assets [Line Items] |  |
Intangible asset addition |  | 32,000,000
Customer lists |  |
Intangible Assets [Line Items] |  |
Gross | 192,099,000 | 192,099,000
Accumulated Amortization | (121,977,000) | (104,429,000)
Net | 70,122,000 | 87,670,000
Intellectual property |  |
Intangible Assets [Line Items] |  |
Gross | 69,100,000 | 69,100,000
Accumulated Amortization | (52,804,000) | (47,187,000)
Net | 16,296,000 | 21,913,000
Trademarks |  |
Intangible Assets [Line Items] |  |
Gross | 12,086,000 | 12,086,000
Accumulated Amortization | (9,549,000) | (7,123,000)
Net | 2,537,000 | 4,963,000
Proprietary databases |  |
Intangible Assets [Line Items] |  |
Gross | 4,256,000 | 4,256,000
Accumulated Amortization | (4,256,000) | (4,256,000)
Net | 0 | 0
Non-compete agreements |  |
Intangible Assets [Line Items] |  |
Gross | 910,000 | 910,000
Accumulated Amortization | (910,000) | (910,000)
Net | $ 0 | $ 0

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