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Acquisitions - Identifiable Intangible Assets Acquired and Respective Estimated Lives (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jan. 31, 2016 | Apr. 30, 2015
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 80,385 | $ 81,270
Weighted average life | 6 years |
Developed technology |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 16,430 | 16,630
Weighted average life | 6 years |
Customer relationships |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 27,860 | $ 28,260
Weighted average life | 5 years |
BTI Acquisition |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 72,550 |
BTI Acquisition | Developed technology |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 16,430 |
Weighted average life | 4 years 3 months 18 days |
BTI Acquisition | Customer relationships |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 25,280 |
Weighted average life | 4 years 4 months 24 days |
BTI Acquisition | Trade names |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 30,740 |
Weighted average life | 5 years 4 months 24 days |
BTI Acquisition | Order backlog |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 100 |
Weighted average life | 3 months 18 days |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + 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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