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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands | Apr. 30, 2021 | Apr. 30, 2020
--- | --- | ---
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | $ 212,751 | $ 212,751
Amortized intangible assets, Accumulated Amortization | (119,892) | (100,658)
Amortized intangible assets, Net | 92,859 | 112,093
Exchange rate fluctuations | 90 | (167)
Total Intangible assets | 92,949 | 111,926
Customer Lists |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 131,299 | 131,299
Amortized intangible assets, Accumulated Amortization | (76,489) | (64,762)
Amortized intangible assets, Net | 54,810 | 66,537
Intellectual Property |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 69,100 | 69,100
Amortized intangible assets, Accumulated Amortization | (33,623) | (26,548)
Amortized intangible assets, Net | 35,477 | 42,552
Database Rights |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 4,256 | 4,256
Amortized intangible assets, Accumulated Amortization | (4,234) | (4,202)
Amortized intangible assets, Net | 22 | 54
Non-compete Agreements |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 910 | 910
Amortized intangible assets, Accumulated Amortization | (910) | (910)
Trademarks |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 7,186 | 7,186
Amortized intangible assets, Accumulated Amortization | (4,636) | (4,236)
Amortized intangible assets, Net | $ 2,550 | $ 2,950

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