Business Acquisition (Details 2) - Ruckus Wireless and ICX Switch business (Ruckus Networks) $ in Thousands	9 Months Ended
Sep. 30, 2018 USD ($)
Business Acquisition [Line Items]
Preliminary Estimated Fair value	$ 494,700
Technology and Patents
Business Acquisition [Line Items]
Preliminary Estimated Fair value	$ 217,900
Estimated Weighted Average Life (years)	5 years 4 months 24 days
Customer Contracts & Relationships
Business Acquisition [Line Items]
Preliminary Estimated Fair value	$ 195,400
Estimated Weighted Average Life (years)	10 years
Trademarks and Trade Names
Business Acquisition [Line Items]
Preliminary Estimated Fair value	$ 10,700
Estimated Weighted Average Life (years)	10 years
Backlog
Business Acquisition [Line Items]
Preliminary Estimated Fair value	$ 15,300
Estimated Weighted Average Life (years)	3 months 18 days
Trade Names
Business Acquisition [Line Items]
Preliminary Estimated Fair value	$ 55,400

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.

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