Business Combinations (Acquisition Of LogLogic, Inc.) (Details) (LogLogic, Inc., USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2012	Apr. 10, 2012
Business Acquisition [Line Items]
Cash		$ 5,018
Accounts receivable (approximate contractual value)		5,359
Other assets		1,524
Deferred income tax asset, net		4,371
Identifiable intangible assets		61,200
Goodwill		73,460
Liabilities		(7,006)
Deferred revenue		(7,297)
Total preliminary purchase price		136,629
Weighted Average Amortization Period	6 years 4 months 18 days
Existing technology
Business Acquisition [Line Items]
Identifiable intangible assets		32,800
Weighted Average Amortization Period	6 years
Customer base
Business Acquisition [Line Items]
Identifiable intangible assets		3,200
Weighted Average Amortization Period	6 years
Maintenance agreements
Business Acquisition [Line Items]
Identifiable intangible assets		22,300
Weighted Average Amortization Period	7 years
Trademarks
Business Acquisition [Line Items]
Identifiable intangible assets		$ 2,900
Weighted Average Amortization Period	7 years