Segment Information (Revenues By Product Grouping) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Net revenues	$ 851,483	$ 758,994	$ 781,560	$ 750,819	$ 802,420	$ 712,731	$ 730,384	$ 672,899	$ 3,142,856		$ 2,918,434		$ 2,586,123
Enterprise and Service Provider division
Segment Reporting Information [Line Items]
Net revenues									2,491,294		2,335,562		2,074,800
Enterprise and Service Provider division | Workspace Services revenues
Segment Reporting Information [Line Items]
Net revenues									1,606,903	[1]	1,549,383	[1]	1,450,850	[1]
Enterprise and Service Provider division | Delivery Networking revenues
Segment Reporting Information [Line Items]
Net revenues									695,734	[2]	634,598	[2]	496,608	[2]
Enterprise and Service Provider division | Professional services
Segment Reporting Information [Line Items]
Net revenues									175,541	[3]	138,879	[3]	119,061	[3]
Enterprise and Service Provider division | Other
Segment Reporting Information [Line Items]
Net revenues									13,116		12,702		8,281
Mobility Apps division
Segment Reporting Information [Line Items]
Net revenues									$ 651,562		$ 582,872		$ 511,323

[1] revenues are primarily comprised of sales from the Company’s desktop and application virtualization products, XenDesktop and XenApp, and the Company's Mobility products, which include XenMobile and related license updates and maintenance and support.

[2] revenues are primarily comprised of sales from the Company’s cloud networking products, which include NetScaler, CloudBridge and ByteMobile Smart Capacity 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.