Repurchases of ARRIS Shares (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2018	Mar. 31, 2018	Jun. 30, 2018
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased		8,400,000	1,000,000	4,000,000
Average Price Paid Per Share		$ 25.40	$ 25.35	$ 25.29
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plans or Programs		$ 562,900
July 2018
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	[1]	2,189,251
Average Price Paid Per Share		$ 25.53
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plans or Programs		$ 350,010
August 2018
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	[1]	3,944,817
Average Price Paid Per Share		$ 24.84
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plans or Programs		$ 252,103
September 2018
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	[1],[2]	2,454,677
Average Price Paid Per Share	[2]	$ 26.16
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Plans or Programs	[2]	$ 562,894
Shares Purchased as Part of Publicly Announced Plans or Programs | July 2018
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased		1,957,982
Shares Purchased as Part of Publicly Announced Plans or Programs | August 2018
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased		3,941,214
Shares Purchased as Part of Publicly Announced Plans or Programs | September 2018
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	[2]	2,454,677

[1] An aggregate of 234,872 shares shown in the table above were subject to equity awards that were cancelled for cash to satisfy employee minimum tax withholding obligations that arose on the vesting of the applicable restricted stock units.

[2] Includes an aggregate of 210,654 shares (approximately $5.5 million) pending settlement as of September 30, 2018.