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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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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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

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