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Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Apr. 30, 2014 | Apr. 30, 2013
Intangible Assets [Line Items] |  |
Weighted-Average Amortization Period (in years) | 11 years |
Amortized intangible assets, Gross | $ 66,551 | $ 66,551
Amortized intangible assets, Accumulated Amortization | (20,777) | (12,115)
Amortized intangible assets, Net | 45,774 | 54,436
Exchange rate fluctuations | (14) | (49)
Intangible assets | 49,560 | 58,187
Customer Lists |  |
Intangible Assets [Line Items] |  |
Weighted-Average Amortization Period (in years) | 10 years |
Amortized intangible assets, Gross | 34,899 | 34,899
Amortized intangible assets, Accumulated Amortization | (8,674) | (4,887)
Amortized intangible assets, Net | 26,225 | 30,012
Database Rights |  |
Intangible Assets [Line Items] |  |
Weighted-Average Amortization Period (in years) | 10 years |
Amortized intangible assets, Gross | 4,256 | 4,256
Amortized intangible assets, Accumulated Amortization | (1,925) | (1,500)
Amortized intangible assets, Net | 2,331 | 2,756
Intellectual Property |  |
Intangible Assets [Line Items] |  |
Weighted-Average Amortization Period (in years) | 20 years |
Amortized intangible assets, Gross | 22,900 | 22,900
Amortized intangible assets, Accumulated Amortization | (7,009) | (3,887)
Amortized intangible assets, Net | 15,891 | 19,013
Trademarks |  |
Intangible Assets [Line Items] |  |
Weighted-Average Amortization Period (in years) | 4 years |
Amortized intangible assets, Gross | 3,686 | 3,686
Amortized intangible assets, Accumulated Amortization | (2,559) | (1,331)
Amortized intangible assets, Net | 1,127 | 2,355
Non-compete Agreements |  |
Intangible Assets [Line Items] |  |
Weighted-Average Amortization Period (in years) | 5 years |
Amortized intangible assets, Gross | 810 | 810
Amortized intangible assets, Accumulated Amortization | (610) | (510)
Amortized intangible assets, Net | 200 | 300
Trademarks |  |
Intangible Assets [Line Items] |  |
Unamortized intangible assets | $ 3,800 | $ 3,800

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- Definition 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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before 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=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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