Goodwill And Other Intangible Assets (Schedule Of Change In Goodwill) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Jul. 31, 2012
Goodwill [Roll Forward]
Balance at January 1, 2013	$ 1,518,219,000
Additions	251,128,000	[1]
Other	(7,523,000)
Balance at March 31, 2013	1,761,824,000
Infrastructure [Member]
Goodwill [Roll Forward]
Balance at January 1, 2013	1,158,580,000
Additions	251,128,000	[1]
Other	(2,332,000)	[2]
Balance at March 31, 2013	1,407,376,000
SaaS [Member]
Goodwill [Roll Forward]
Balance at January 1, 2013	359,639,000
Additions	0
Other	(5,191,000)	[3]
Balance at March 31, 2013	354,448,000
Bytemobile [Member]
Goodwill [Roll Forward]
Balance at January 1, 2013			223,556,000
Balance at March 31, 2013			223,556,000
Purchase accounting adjustments related to deferred tax assets	7,100,000
Purchase accounting adjustments related to deferred revenue	$ 5,300,000

[1] Amount relates to Zenprise acquisition. See Note 4 for more information regarding the Company’s acquisitions.

[2] Amount primarily relates to adjustments to the preliminary purchase price allocation associated with the Bytemobile acquisition, primarily related to adjustments of certain income tax assets and liabilities of $7.1 million, partially offset by a $5.3 million adjustment to current portion of deferred revenues.

[3] Amount primarily relates to foreign currency translation.