Business Combinations (Schedule of Net Assets Acquired) (Details) - USD ($) $ in Thousands				9 Months Ended
	Dec. 02, 2014	Oct. 01, 2014	May. 13, 2014	Aug. 31, 2015	Nov. 30, 2014
Business Acquisition [Line Items]
Goodwill				$ 370,465	$ 232,836
Telerik AD [Member]
Business Acquisition [Line Items]
Net working capital	$ 6,612
Property, plant and equipment	3,108
Intangible assets	123,100
Deferred taxes	(10,401)
Deferred revenue	(7,915)
Other non-current liabilities	(472)
Goodwill	137,921
Net assets acquired	$ 251,953
Acquired intangible assets, useful life	5 years			5 years
Telerik AD [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets	$ 47,100
BravePoint Inc. [Member]
Business Acquisition [Line Items]
Net working capital		$ 2,902
Property, plant and equipment		735
Other assets		16
Deferred revenue		(680)
Goodwill		2,257
Net assets acquired		12,000
BravePoint Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets		$ 4,110
Acquired intangible assets, useful life		7 years
BravePoint Inc. [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets		$ 850
Acquired intangible assets, useful life		7 years
BravePoint Inc. [Member] | Purchased Technology [Member]
Business Acquisition [Line Items]
Intangible assets		$ 1,810
Acquired intangible assets, useful life		3 years
Modulus [Member]
Business Acquisition [Line Items]
Net working capital			$ 7
Goodwill			6,433
Net assets acquired			13,950
Modulus [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets			$ 190
Acquired intangible assets, useful life			7 years
Modulus [Member] | Purchased Technology [Member]
Business Acquisition [Line Items]
Intangible assets			$ 7,320
Acquired intangible assets, useful life			7 years