Business Combinations (Schedule of Net Assets Acquired) (Details) - USD ($) $ in Thousands			12 Months Ended
	Oct. 01, 2014	May 13, 2014	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2014
Business Acquisition [Line Items]
Goodwill			$ 369,985	$ 278,067	$ 232,836
Telerik AD [Member]
Business Acquisition [Line Items]
Net working capital			8,222
Property and equipment			3,078
Identifiable intangible assets			$ 123,100
Acquired intangible assets, weighted average life			5 years
Deferred taxes			$ (9,272)
Deferred revenue			(7,915)
Other non-current liabilities			(2,732)
Goodwill			137,472	$ 137,500
Net assets acquired			$ 251,953
BravePoint Inc. [Member]
Business Acquisition [Line Items]
Net working capital	$ 2,902
Property and equipment	735
Other assets	16
Deferred revenue	(680)
Goodwill	2,257
Net assets acquired	12,000
Modulus [Member]
Business Acquisition [Line Items]
Net working capital		$ 7
Goodwill		6,433
Net assets acquired		13,950
Customer-Related [Member] | BravePoint Inc. [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 4,110
Acquired intangible assets, weighted average life	7 years
Customer-Related [Member] | Modulus [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		$ 190
Acquired intangible assets, weighted average life		7 years
Trade Names [Member] | BravePoint Inc. [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 850
Acquired intangible assets, weighted average life	7 years
Purchased Technology [Member] | BravePoint Inc. [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 1,810
Acquired intangible assets, weighted average life	3 years
Purchased Technology [Member] | Modulus [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		$ 7,320
Acquired intangible assets, weighted average life		7 years