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Intangible Assets (Detail) - USD ($) $ in Thousands | Apr. 30, 2017 | Apr. 30, 2016
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Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | $ 167,351 | $ 167,351
Amortized intangible assets, Accumulated Amortization | (56,109) | (40,707)
Amortized intangible assets, Net | 111,242 | 126,644
Exchange rate fluctuations | 77 | 383
Total Intangible assets | 217,319 | 233,027
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 | 106,000
Customer Lists |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 125,099 | 125,099
Amortized intangible assets, Accumulated Amortization | (31,094) | (19,910)
Amortized intangible assets, Net | 94,005 | 105,189
Intellectual Property |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 33,100 | 33,100
Amortized intangible assets, Accumulated Amortization | (16,994) | (13,281)
Amortized intangible assets, Net | 16,106 | 19,819
Database Rights |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 4,256 | 4,256
Amortized intangible assets, Accumulated Amortization | (3,202) | (2,777)
Amortized intangible assets, Net | 1,054 | 1,479
Non-compete Agreements |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 910 | 910
Amortized intangible assets, Accumulated Amortization | (833) | (753)
Amortized intangible assets, Net | $ 77 | $ 157

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