Segment Information (Revenues By Product Grouping) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net revenues		$ 841,251	$ 813,270	$ 2,509,909	$ 2,370,831
Operating Segments [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues		668,736	649,185	2,001,496	1,906,223
Operating Segments [Member] | GoTo Business Division [Member]
Segment Reporting Information [Line Items]
Net revenues		172,515	164,085	508,413	464,608
Operating Segments [Member] | Workspace Services revenues [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	414,394	394,523	1,227,172	1,188,186
Operating Segments [Member] | Delivery Networking revenues [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues	[2]	191,243	189,746	581,612	527,987
Operating Segments [Member] | Cloud Services revenues [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues	[3]	33,185	26,448	95,229	73,142
Operating Segments [Member] | Professional Services [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues	[4]	29,851	36,675	97,310	110,575
Other Income [Member] | Operating Segments [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues		$ 63	$ 1,793	$ 173	$ 6,333

[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] Cloud Services revenues primarily include ShareFile, Podio and Citrix Cloud products.

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