Acquisitions (Schedule Of Identifiable Intangible Assets Purchased) (Details) (USD $) In Thousands, unless otherwise specified		1 Months Ended					1 Months Ended
	Jan. 31, 2013 Zenprise, Inc. [Member]	Jan. 31, 2013 Zenprise, Inc. [Member] Trade Names [Member]	Jan. 31, 2013 Zenprise, Inc. [Member] Noncompete Agreements [Member]	Jan. 31, 2013 Zenprise, Inc. [Member] Customer Relationships [Member]	Jan. 31, 2013 Zenprise, Inc. [Member] Core and Product Technologies [Member]	Jul. 31, 2012 Bytemobile [Member]	Jul. 31, 2012 Bytemobile [Member] Trade Names [Member]	Jul. 31, 2012 Bytemobile [Member] Customer Relationships [Member]	Jul. 31, 2012 Bytemobile [Member] Core and Product Technologies [Member]
Business Acquisition [Line Items]
Identifiable intangible assets acquired	$ 69,200	$ 2,400	$ 700	$ 18,300	$ 47,800	$ 248,900	$ 6,000	$ 141,500	$ 101,400
Asset Life		3 years	1 year	7 years	6 years		6 years	9 years	4 years 9 months 18 days