Segment Information (Revenues By Product Grouping) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net revenues		$ 697,192	$ 662,677	[1]
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net revenues		697,192	662,677	[2]
Operating Segments [Member] | Workspace Services revenues [Member]
Segment Reporting Information [Line Items]
Net revenues	[3]	412,580	400,628	[2]
Operating Segments [Member] | Networking revenues [Member]
Segment Reporting Information [Line Items]
Net revenues	[4]	208,623	193,420	[2]
Operating Segments [Member] | Content Collaboration revenues [Member]
Segment Reporting Information [Line Items]
Net revenues	[5]	44,680	38,911	[2]
Operating Segments [Member] | Professional Services [Member]
Segment Reporting Information [Line Items]
Net revenues	[6]	$ 31,309	$ 29,718	[2]

[1] As noted above, prior period amounts have not been adjusted under the modified retrospective method. See Note 2 for further information regarding the Company’s adoption of the revenue recognition standard.

[2] Prior period amounts have not been adjusted under the modified retrospective method. See Note 2 for further information regarding the Company’s adoption of the revenue recognition standard.

[3] Workspace Services revenues are primarily comprised of sales from the Company’s application virtualization products, which include XenDesktop and XenApp, the Company's enterprise mobility management products, which include XenMobile and related license updates, maintenance and subscription offerings.

[4] Networking revenues primarily include NetScaler ADC and NetScaler SD-WAN and related license updates, maintenance and subscription offerings.

[5] Content Collaboration revenues primarily include ShareFile, Podio and related cloud offerings

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