Business Combinations (Narrative) (Details) (USD $)	12 Months Ended			1 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010	Apr. 30, 2012 LogLogic, Inc.	Apr. 10, 2012 LogLogic, Inc.	Aug. 30, 2011 Nimbus Partners Limited	Nov. 30, 2011 Loyalty Lab, Inc.	Dec. 07, 2010 Loyalty Lab, Inc.	Aug. 31, 2011 OpenSpirit Corporation	Feb. 28, 2011 OpenSpirit Corporation	Sep. 22, 2010 OpenSpirit Corporation	Aug. 31, 2011 Proginet Corporation	Sep. 15, 2010 Proginet Corporation	Feb. 28, 2011 Kabira Technologies, Inc.	Apr. 20, 2010 Kabira Technologies, Inc.	Mar. 08, 2010 Netrics.Com, Inc.	Nov. 30, 2010 Foresight Corporation	Dec. 31, 2009 Foresight Corporation
Business Acquisition [Line Items]
Acquisitions, net of cash acquired	$ 132,209,000	$ 63,610,000	$ 78,573,000	$ 131,600,000
Cash paid to acquire outstanding shares					136,629,000	42,000,000		23,500,000			18,400,000		22,000,000		3,900,000	10,500,000		30,000,000
Acquisition related expenses					700,000	1,000,000		400,000			500,000		600,000		500,000	400,000		800,000
Goodwill adjustment related to acquisition							(400,000)		(500,000)	(200,000)		200,000		500,000			(1,100,000)
Goodwill acquired deductible for income tax purposes															$ 1,300,000