Segment Information (Revenues By Product Grouping) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Net revenues	$ 619,366	$ 565,348	$ 530,790	$ 490,888	$ 529,724	$ 472,233	$ 458,433	$ 414,272	$ 2,206,392		$ 1,874,662		$ 1,614,088
Enterprise Divisions [Member]
Net revenues									1,778,646		1,514,045		1,305,911
Desktop Solutions Revenues [Member]
Net revenues									1,278,798	[1]	1,137,326	[1]	1,015,234	[1]
Datacenter And Cloud Solutions Revenues [Member]
Net revenues									385,518	[2]	298,649	[2]	231,396	[2]
Enterprise Technical Services [Member]
Net revenues									91,496	[3]	59,371	[3]	41,288	[3]
Other Revenues [Member]
Net revenues									22,834	[4]	18,699	[4]	17,993	[4]
Online Services Division [Member]
Net revenues									$ 427,746		$ 360,617		$ 308,177

[1] Desktop Solutions revenues are primarily comprised of sales from the Company’s desktop virtualization product, XenDesktop, and the Company’s application virtualization product, XenApp, and related license updates and technical support.

[2] Datacenter and Cloud Solutions revenues are primarily comprised of sales from the Company’s cloud networking products which include NetScaler and Branch Repeater and the Company’s CloudPlatform products which include XenServer, CloudStack and CloudPortal and related license updates and maintenance.

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

[4] Other is primarily comprised of revenues from other products, including Enterprise division's ShareFile SaaS products.