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Intangible Assets (Detail) - USD ($) $ in Thousands | Apr. 30, 2015 | Apr. 30, 2014
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Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | $ 73,151 | $ 66,551
Amortized intangible assets, Accumulated Amortization | (29,023) | (20,777)
Amortized intangible assets, Net | 44,128 | 45,774
Exchange rate fluctuations | (27) | (14)
Intangible assets | 47,901 | 49,560
Trademarks |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 3,986 | 3,686
Amortized intangible assets, Accumulated Amortization | (3,291) | (2,559)
Amortized intangible assets, Net | 695 | 1,127
Unamortized intangible assets | 3,800 | 3,800
Customer Lists |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 41,099 | 34,899
Amortized intangible assets, Accumulated Amortization | (12,578) | (8,674)
Amortized intangible assets, Net | 28,521 | 26,225
Intellectual Property |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 22,900 | 22,900
Amortized intangible assets, Accumulated Amortization | (10,130) | (7,009)
Amortized intangible assets, Net | 12,770 | 15,891
Database Rights |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 4,256 | 4,256
Amortized intangible assets, Accumulated Amortization | (2,351) | (1,925)
Amortized intangible assets, Net | 1,905 | 2,331
Non-compete Agreements |  |
Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross | 910 | 810
Amortized intangible assets, Accumulated Amortization | (673) | (610)
Amortized intangible assets, Net | $ 237 | $ 200

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