Segment Information (Revenues By Product Grouping) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net revenues		$ 908,356	$ 841,251	$ 842,980	$ 825,678	$ 904,763	$ 813,270	$ 796,759	$ 760,802	$ 3,418,265	$ 3,275,594	$ 3,142,856
Enterprise and Service Provider
Segment Reporting Information [Line Items]
Net revenues										2,736,080	2,646,154	2,563,064
GoTo Business Division
Segment Reporting Information [Line Items]
Net revenues										682,185	629,440	579,792
Operating Segments | Enterprise and Service Provider
Segment Reporting Information [Line Items]
Net revenues										2,736,080	2,646,154	2,563,064
Operating Segments | Enterprise and Service Provider | Other
Segment Reporting Information [Line Items]
Net revenues										238	8,281	9,345
Operating Segments | GoTo Business Division
Segment Reporting Information [Line Items]
Net revenues										682,185	629,440	579,792
Delivery Networking revenues | Operating Segments | Enterprise and Service Provider
Segment Reporting Information [Line Items]
Net revenues	[1]									782,875	749,910	702,028
Workspace Services revenues | Operating Segments | Enterprise and Service Provider
Segment Reporting Information [Line Items]
Net revenues	[2]									1,690,783	1,639,072	1,600,581
Cloud Services Revenue [Member] | Operating Segments | Enterprise and Service Provider
Segment Reporting Information [Line Items]
Net revenues	[3]									130,955	101,403	75,569
Professional services | Operating Segments | Enterprise and Service Provider
Segment Reporting Information [Line Items]
Net revenues	[4]									$ 131,229	$ 147,488	$ 175,541

[1] Delivery Networking revenues are primarily comprised of NetScaler ADC and NetScaler SD-WAN, and related license updates and maintenance and support.

[2] Workspace Services revenues are primarily comprised of sales from XenDesktop, XenApp, XenMobile and related license updates and maintenance and support.

[3] Cloud Services revenues primarily include ShareFile, Podio and Citrix Cloud products.

[4] Professional services revenues are primarily comprised of revenues from consulting services and product training and certification services.