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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands | Apr. 30, 2022 | Apr. 30, 2021
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Intangible Assets [Line Items] |  |  |
Amortized intangible assets, Gross | [1] | $ 230,051 | $ 212,751
Amortized intangible assets, Accumulated Amortization | [1] | (140,171) | (119,892)
Amortized intangible assets, Net | [1] | 89,880 | 92,859
Exchange rate fluctuations |  | (110) | 90
Total Intangible assets |  | 89,770 | 92,949
Customer Lists |  |  |
Intangible Assets [Line Items] |  |  |
Amortized intangible assets, Gross |  | 146,799 | 131,299
Amortized intangible assets, Accumulated Amortization |  | (89,024) | (76,489)
Amortized intangible assets, Net |  | 57,775 | 54,810
Intellectual Property |  |  |
Intangible Assets [Line Items] |  |  |
Amortized intangible assets, Gross |  | 69,100 | 69,100
Amortized intangible assets, Accumulated Amortization |  | (40,720) | (33,623)
Amortized intangible assets, Net |  | 28,380 | 35,477
Database Rights |  |  |
Intangible Assets [Line Items] |  |  |
Amortized intangible assets, Gross |  | 4,256 | 4,256
Amortized intangible assets, Accumulated Amortization |  | (4,256) | (4,234)
Amortized intangible assets, Net |  |  | 22
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 |  | 8,986 | 7,186
Amortized intangible assets, Accumulated Amortization |  | (5,261) | (4,636)
Amortized intangible assets, Net |  | $ 3,725 | $ 2,550
[1] | In fiscal 2022 there were intangible assets additions of $11.6 million and $5.7 million from the acquisition of the Lucas Group and Patina Solutions Group, respectively.

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