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Intangible Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2018	Apr. 30, 2017
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

X

- Definition

The accumulated foreign exchange gain/(loss) included in intangible assets.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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