Acquired Intangible Assets (Detail) - Ruckus Wireless and ICX Switch business (Ruckus Networks) - USD ($) $ in Thousands	Dec. 01, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Preliminary Estimated Fair value	$ 472,500	$ 472,500
Customer Contracts & Relationships
Business Acquisition [Line Items]
Preliminary Estimated Fair value	$ 100,000
Estimated Weighted Average Life (years)	7 years
Technology and Patents
Business Acquisition [Line Items]
Preliminary Estimated Fair value	$ 265,000
Estimated Weighted Average Life (years)	6 years 9 months 18 days
Trademarks and Trade Names
Business Acquisition [Line Items]
Preliminary Estimated Fair value	$ 22,500
Estimated Weighted Average Life (years)	10 years
Backlog
Business Acquisition [Line Items]
Preliminary Estimated Fair value	$ 35,000
Estimated Weighted Average Life (years)	6 months
In-process Research and Development
Business Acquisition [Line Items]
Preliminary Estimated Fair value	$ 50,000

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.

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=66006027&loc=d3e16265-109275

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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