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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands | Apr. 30, 2019 | Apr. 30, 2018
--- | --- | ---
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | $ 167,351 | $ 167,351
Amortized intangible assets, Accumulated Amortization | (84,329) | (70,847)
Amortized intangible assets, Net | 83,022 | 96,504
Exchange rate fluctuations | (74) | 712
Total Intangible assets | 82,948 | 203,216
Customer Lists |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 125,099 | 125,099
Amortized intangible assets, Accumulated Amortization | (53,352) | (42,248)
Amortized intangible assets, Net | 71,747 | 82,851
Intellectual Property |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 33,100 | 33,100
Amortized intangible assets, Accumulated Amortization | (22,045) | (20,112)
Amortized intangible assets, Net | 11,055 | 12,988
Database Rights |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 4,256 | 4,256
Amortized intangible assets, Accumulated Amortization | (4,053) | (3,628)
Amortized intangible assets, Net | 203 | 628
Non-compete Agreements |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 910 | 910
Amortized intangible assets, Accumulated Amortization | (893) | (873)
Amortized intangible assets, Net | 17 | 37
Trademarks |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 3,986 | 3,986
Amortized intangible assets, Accumulated Amortization | $ (3,986) | (3,986)
Unamortized intangible assets |  | $ 106,000

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