Business Combinations (Schedule of Net Assets Acquired) (Details) - USD ($) $ in Thousands			12 Months Ended
	Jun. 01, 2017	Mar. 01, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2015	Dec. 02, 2014
Business Acquisition [Line Items]
Goodwill			$ 278,067	$ 315,041	$ 369,985
Kinvey, Inc. [Member]
Business Acquisition [Line Items]
Net working capital	$ (963)
Property and equipment	26
Net deferred tax assets	1,465
Goodwill	24,351
Net assets acquired	48,879
DataRPM Corporation [Member]
Business Acquisition [Line Items]
Net working capital		$ (174)
Property and equipment		68
Deferred taxes		(5,006)
Goodwill		12,583
Net assets acquired		28,271
Telerik AD [Member]
Business Acquisition [Line Items]
Net working capital			8,222
Property and equipment			3,078
Identifiable intangible assets			123,100
Deferred taxes			(9,272)
Deferred revenue			(7,915)
Other non-current liabilities			(2,732)
Goodwill			137,472	$ 137,500
Net assets acquired			$ 251,953
Acquired intangible assets, weighted average life			5 years
Purchased Technology [Member] | Kinvey, Inc. [Member]
Business Acquisition [Line Items]
Intangible assets	$ 22,100
Acquired intangible assets, Life	5 years
Purchased Technology [Member] | DataRPM Corporation [Member]
Business Acquisition [Line Items]
Intangible assets		$ 19,900
Acquired intangible assets, Life		5 years
Trade Names [Member] | Kinvey, Inc. [Member]
Business Acquisition [Line Items]
Intangible assets	$ 1,800
Acquired intangible assets, Life	5 years
Trade Names [Member] | DataRPM Corporation [Member]
Business Acquisition [Line Items]
Intangible assets		$ 800
Acquired intangible assets, Life		5 years
Customer Relationships [Member] | Kinvey, Inc. [Member]
Business Acquisition [Line Items]
Intangible assets	$ 100
Acquired intangible assets, Life	5 years
Customer Relationships [Member] | DataRPM Corporation [Member]
Business Acquisition [Line Items]
Intangible assets		$ 100
Acquired intangible assets, Life		5 years
Customer Relationships [Member] | Telerik AD [Member]
Business Acquisition [Line Items]
Identifiable intangible assets						$ 47,100