Segment Information (Revenues By Product Grouping) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net revenues		$ 904,763	$ 813,270	$ 796,759	$ 760,802	$ 851,483	$ 758,994	$ 781,560	$ 750,819	$ 3,275,594	$ 3,142,856	$ 2,918,434
Enterprise and Service Provider
Segment Reporting Information [Line Items]
Net revenues										2,544,302	2,491,294	2,335,562
Enterprise and Service Provider | Workspace Services revenues
Segment Reporting Information [Line Items]
Net revenues	[1]									1,645,331	1,606,903	1,549,383
Enterprise and Service Provider | Delivery Networking revenues
Segment Reporting Information [Line Items]
Net revenues	[2]									741,121	695,734	634,598
Enterprise and Service Provider | Professional services
Segment Reporting Information [Line Items]
Net revenues	[3]									147,488	175,541	138,879
Enterprise and Service Provider | Other
Segment Reporting Information [Line Items]
Net revenues										10,362	13,116	12,702
Mobility Apps division
Segment Reporting Information [Line Items]
Net revenues										$ 731,292	$ 651,562	$ 582,872

[1] Workspace Services revenues are primarily comprised of sales from the Company’s windows app delivery products, which includes XenDesktop and XenApp, and the Company's mobile app delivery products, which include XenMobile and related license updates and maintenance and support.

[2] Delivery Networking revenues primarily include NetScaler, ByteMobile Smart Capacity and CloudBridge products and related license updates and maintenance and support.

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