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Intangible Assets (Detail) - USD ($) $ in Thousands | Apr. 30, 2018 | Apr. 30, 2017
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Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | $ 167,351 | $ 167,351
Amortized intangible assets, Accumulated Amortization | (70,847) | (56,109)
Amortized intangible assets, Net | 96,504 | 111,242
Exchange rate fluctuations | 712 | 77
Total Intangible assets | 203,216 | 217,319
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 | (42,248) | (31,094)
Amortized intangible assets, Net | 82,851 | 94,005
Intellectual Property |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 33,100 | 33,100
Amortized intangible assets, Accumulated Amortization | (20,112) | (16,994)
Amortized intangible assets, Net | 12,988 | 16,106
Database Rights |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 4,256 | 4,256
Amortized intangible assets, Accumulated Amortization | (3,628) | (3,202)
Amortized intangible assets, Net | 628 | 1,054
Non-compete Agreements |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 910 | 910
Amortized intangible assets, Accumulated Amortization | (873) | (833)
Amortized intangible assets, Net | $ 37 | $ 77

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