Significant Accounting Policies (Changes in Goodwill) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Goodwill [Roll Forward]
Beginning balance	$ 1,518,219,000		$ 1,239,120,000
Additions	251,468,000	[1]	283,860,000	[1]
Other	(738,000)		(4,761,000)
Ending balance	1,768,949,000		1,518,219,000
Enterprise and Service Provider division
Goodwill [Roll Forward]
Beginning balance	1,158,580,000		956,504,000
Additions	248,800,000		257,379,000
Other	(5,224,000)	[2]	(55,303,000)	[3]
Ending balance	1,402,156,000		1,158,580,000
SaaS division
Goodwill [Roll Forward]
Beginning balance	359,639,000		282,616,000
Additions	2,668,000		26,481,000
Other	4,486,000	[4]	50,542,000	[3]
Ending balance	366,793,000		359,639,000
ByteMobile
Goodwill [Roll Forward]
Ending balance	221,914,000
Purchase accounting adjustments	$ 3,300,000

[1] Amount primarily relates to acquisitions. See Note 3 for more information regarding the Company’s acquisitions.

[2] Amount primarily relates to adjustments to the preliminary purchase price allocation for certain 2012 Acquisitions.

[3] Amount primarily relates to reclassification of goodwill between segments. In the first quarter of 2012, the Company transferred the business acquired in its acquisition of Novell Labs, Inc. (d/b/a "ShareFile") from its Enterprise and Service Provider division to its SaaS division. Also included in the SaaS division is foreign currency translation.

[4] Amount primarily relates to foreign currency translation.