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, 2015	Dec. 02, 2014	Nov. 30, 2014	Nov. 30, 2013	May. 24, 2013
Business Acquisition [Line Items]
Goodwill			$ 369,985	$ 369,985		$ 232,836	$ 224,286
Telerik AD [Member]
Business Acquisition [Line Items]
Net working capital			8,222	8,222	$ 7,909
Measurement Period Adjustments, Net working capital			313
Property and equipment			3,078	3,078	3,108
Measurement Period Adjustments, Property, plant and equipment			(30)
Identifiable intangible assets			123,100	$ 123,100	123,100
Measurement Period Adjustments, Identifiable intangible assets			0
Acquired intangible assets life				5 years
Deferred taxes			(9,272)	$ (9,272)	(10,401)
Measurement Period Adjustments, Deferred taxes			(1,129)
Deferred revenue			(7,915)	(7,915)	(7,915)
Measurement Period Adjustments, Deferred revenue			0
Other non-current liabilities			(2,732)	(2,732)	(1,769)
Measurement Period Adjustments, Other non-current liabilities			963
Goodwill			137,472	137,472	137,921
Measurement Period Adjustments, Goodwill			(449)
Net assets acquired			$ 251,953	$ 251,953	$ 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
Rollbase [Member]
Business Acquisition [Line Items]
Cash								$ 50
Identifiable intangible assets								7,960
Deferred taxes								(2,921)
Goodwill								4,798
Accounts payable and other liabilities								(8)
Net assets acquired								$ 9,879
Rollbase [Member] | Minimum [Member]
Business Acquisition [Line Items]
Acquired intangible assets life				1 year
Rollbase [Member] | Maximum [Member]
Business Acquisition [Line Items]
Acquired intangible assets life				5 years
Customer-Related [Member] | BravePoint Inc. [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 4,110
Acquired intangible assets life	7 years
Customer-Related [Member] | Modulus [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		$ 190
Acquired intangible assets life		7 years
Trade Names [Member] | BravePoint Inc. [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 850
Acquired intangible assets life	7 years
Purchased Technology [Member] | BravePoint Inc. [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	$ 1,810
Acquired intangible assets life	3 years
Purchased Technology [Member] | Modulus [Member]
Business Acquisition [Line Items]
Identifiable intangible assets		$ 7,320
Acquired intangible assets life		7 years