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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands | Apr. 30, 2020 | Apr. 30, 2019
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Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | $ 212,751 | $ 167,351
Amortized intangible assets, Accumulated Amortization | (100,658) | (84,329)
Amortized intangible assets, Net | 112,093 | 83,022
Exchange rate fluctuations | (167) | (74)
Total Intangible assets | 111,926 | 82,948
Customer Lists |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 131,299 | 125,099
Amortized intangible assets, Accumulated Amortization | (64,762) | (53,352)
Amortized intangible assets, Net | 66,537 | 71,747
Intellectual Property |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 69,100 | 33,100
Amortized intangible assets, Accumulated Amortization | (26,548) | (22,045)
Amortized intangible assets, Net | 42,552 | 11,055
Database Rights |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 4,256 | 4,256
Amortized intangible assets, Accumulated Amortization | (4,202) | (4,053)
Amortized intangible assets, Net | 54 | 203
Non-compete Agreements |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 910 | 910
Amortized intangible assets, Accumulated Amortization | (910) | (893)
Amortized intangible assets, Net |  | 17
Trademarks |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 7,186 | 3,986
Amortized intangible assets, Accumulated Amortization | (4,236) | $ (3,986)
Amortized intangible assets, Net | $ 2,950 |

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