Restructuring, Acquisition and Integration (Detail Textuals) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2017 USD ($)	Mar. 31, 2016 USD ($) Employees	Dec. 31, 2018 USD ($) Employee	Dec. 31, 2017 USD ($) Employees	Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Lease exist costs		$ 96,300	$ 41,030	$ 20,930
Total number of positions affected by the restructuring plan | Employees		1,545
Acquisition expense	$ 61,500
Integration, acquisition and restructuring			41,922	98,357	$ 158,137
Ruckus Wireless and ICX Switch business (Ruckus Networks)
Restructuring Cost and Reserve [Line Items]
Acquisition expense			9,700	74,500	29,000
Cash settlement of stock-based awards				61,500
Employee severance & termination benefits
Restructuring Cost and Reserve [Line Items]
Lease exist costs			$ 38,512	$ 13,346
Total number of positions affected by the restructuring plan			1,084	195
Contractual obligations and other
Restructuring Cost and Reserve [Line Items]
Lease exist costs			$ 1,607	$ 5,742
Leased properties, remaining expiration terms			2021	2021
Write-off of property, plant and equipment
Restructuring Cost and Reserve [Line Items]
Lease exist costs			$ 911	$ 1,842
Integration Related
Restructuring Cost and Reserve [Line Items]
Integration, acquisition and restructuring			$ 4,600	$ 2,900	$ 24,200