Segment Information (Revenues By Product Grouping) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Net revenues	$ 739,996	$ 619,366	$ 641,422	$ 615,210	$ 589,495	$ 565,348	$ 530,790	$ 490,888	$ 2,586,123		$ 2,206,392		$ 1,874,662
Enterprise Divisions [Member]
Net revenues									2,074,800		1,778,646		1,514,045
Mobile and Desktop revenues(1)
Net revenues									1,440,293	[1]	1,278,798	[1]	1,137,326	[1]
Networking and Cloud revenues(2)
Net revenues									494,225	[2]	385,518	[2]	298,649	[2]
Professional services(3)
Net revenues									119,061	[3]	91,496	[3]	59,371	[3]
Other
Net revenues									21,221	[4]	22,834	[4]	18,699	[4]
Online Services division revenues
Net revenues									$ 511,323		$ 427,746		$ 360,617

[1] revenues (formerly Desktop Solutions) are primarily comprised of sales from the Company’s desktop virtualization products, XenDesktop and XenApp, and related license updates and maintenance and support.

[2] revenues (formerly Datacenter and Cloud Solutions) are primarily comprised of sales from the Company’s cloud networking products which include NetScaler, Cloud Bridge (includes product formerly known as Branch Repeater) and Bytemobile Smart Capacity, and the Company’s cloud platform products which include XenServer, CloudPlatform (formerly CloudStack) and CloudPortal and related license updates and maintenance.

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

[4] .