Acquisitions (Estimated Fair Values Of Assets Acquired And Liabilities Assumed) (Details) (USD $) In Thousands, unless otherwise specified					1 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Jan. 31, 2013 Zenprise, Inc. [Member]	Jul. 31, 2012 Bytemobile [Member]	Jan. 31, 2013 Minimum [Member] Zenprise, Inc. [Member]	Jul. 31, 2012 Minimum [Member] Bytemobile [Member]	Jan. 31, 2013 Maximum [Member] Zenprise, Inc. [Member]	Jul. 31, 2012 Maximum [Member] Bytemobile [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Current assets			$ 10,943	$ 57,796
Other assets			668	7,406
Property and equipment			431	2,484
Deferred tax assets, non-current			35,656	45,598
Intangible assets			69,200	248,900
Goodwill	1,766,902	1,518,219	249,392	221,251
Assets acquired			366,290	583,435
Current liabilities assumed			(8,475)	(62,313)
Long-term liabilities assumed			(3,107)	(4,083)
Deferred tax liabilities, non-current			(27,714)	(111,905)
Net assets acquired			$ 326,994	$ 405,134
Asset Life					1 year	1 year	7 years	9 years