Segment Information (Revenues By Product Grouping) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Net revenues	$ 641,422		$ 565,348		$ 1,846,127		$ 1,587,026
Desktop Solutions Revenues [Member]
Net revenues	348,624	[1]	315,983	[1]	1,029,895	[1]	909,751	[1]
Datacenter And Cloud Solutions Revenues [Member]
Net revenues	127,474	[2]	111,155	[2]	339,296	[2]	282,081	[2]
Professional Services [Member]
Net revenues	31,022	[3]	23,210	[3]	86,141	[3]	63,991	[3]
Other Revenues [Member]
Net revenues	4,643		5,442		14,893		15,394
Enterprise Divisions [Member]
Net revenues	511,763		455,790		1,470,225		1,271,217
Online Services Division [Member]
Net revenues	$ 129,659		$ 109,558		$ 375,902		$ 315,809

[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, Branch Repeater, Access Gateway and Bytemobile, and the Company’s cloud solutions products which include CloudPlatform (formerly CloudStack) and CloudPortal Business Manager (formerly CloudPortal) and related license updates and maintenance.

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