Segment Information (Revenues By Product Grouping) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net revenues		$ 796,759	$ 781,560	$ 1,557,561	$ 1,532,379
Operating Segments [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues		619,175	620,781	1,210,613	1,214,468
Operating Segments [Member] | Mobility Apps [Member]
Segment Reporting Information [Line Items]
Net revenues		177,584	160,779	346,948	317,911
Operating Segments [Member] | Workspace Services revenues [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	406,202	395,867	797,011	777,228
Operating Segments [Member] | Delivery Networking revenues [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues	[2]	173,053	179,298	334,041	345,843
Operating Segments [Member] | Professional Services [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues	[3]	37,040	41,948	73,900	84,453
Operating Segments [Member] | Other [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues		$ 2,880	$ 3,668	$ 5,661	$ 6,944

[1] Workspace Services revenues are primarily comprised of sales from the Company’s windows app delivery products, which include 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.