Business Acquisition (Details 1) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 2,261,002	$ 2,278,512
Ruckus Wireless and ICX Switch business (Ruckus Networks)
Business Acquisition [Line Items]
Total estimated consideration transferred		761,013
Cash and cash equivalents		18,958
Accounts receivable, net		26,941
Inventories		48,436
Prepaids & other		3,830
Property, plant & equipment		31,863
Intangible assets		494,700
Other assets		1,631
Accounts payable and accrued liabilities		(15,693)
Other current liabilities		(11,654)
Deferred revenue		(46,748)
Noncurrent deferred income tax liabilities		(99,876)
Other noncurrent liabilities		(2,187)
Net assets acquired		450,201
Goodwill		310,812
Ruckus Wireless and ICX Switch business (Ruckus Networks) | As Reported
Business Acquisition [Line Items]
Total estimated consideration transferred	[1]	761,013
Cash and cash equivalents	[1]	18,958
Accounts receivable, net	[1]	32,940
Inventories	[1]	48,897
Prepaids & other	[1]	4,836
Property, plant & equipment	[1]	33,500
Intangible assets	[1]	472,500
Other assets	[1]	39,528
Accounts payable and accrued liabilities	[1]	(17,216)
Other current liabilities	[1]	(9,666)
Deferred revenue	[1]	(47,718)
Noncurrent deferred income tax liabilities	[1]	(92,233)
Other noncurrent liabilities	[1]	(41,347)
Net assets acquired	[1]	442,979
Goodwill	[1]	318,034
Ruckus Wireless and ICX Switch business (Ruckus Networks) | Adjustments
Business Acquisition [Line Items]
Total estimated consideration transferred		0
Cash and cash equivalents		0
Accounts receivable, net		(5,999)
Inventories		(461)
Prepaids & other		(1,006)
Property, plant & equipment		(1,637)
Intangible assets		22,200
Other assets		(37,897)
Accounts payable and accrued liabilities		1,523
Other current liabilities		(1,988)
Deferred revenue		970
Noncurrent deferred income tax liabilities		(7,643)
Other noncurrent liabilities		39,160
Net assets acquired		7,222
Goodwill		$ 7,222

[1] As previously reported as of December 31, 2017.