Business Combinations (Narrative) (Details) - USD ($)				12 Months Ended
	Jun. 01, 2017	Mar. 01, 2017	Dec. 02, 2014	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Business Acquisition [Line Items]
Goodwill				$ 315,041,000	$ 278,067,000	$ 369,985,000
Acquisition-related expenses				1,458,000	1,240,000	4,239,000
Stock-based compensation				14,153,000	22,541,000	24,004,000
Intangible assets, amortization expense				33,100,000	28,200,000	29,600,000
Kinvey, Inc. [Member]
Business Acquisition [Line Items]
Equity interests (as a percent)	100.00%
Total purchase consideration	$ 49,200,000
Purchase consideration, contingent consideration	300,000
Goodwill	24,351,000
Acquisition-related expenses	$ 1,100,000
DataRPM Corporation [Member]
Business Acquisition [Line Items]
Equity interests (as a percent)		100.00%
Total purchase consideration		$ 30,000,000
Goodwill		12,583,000
Acquisition-related expenses				400,000
Telerik AD [Member]
Business Acquisition [Line Items]
Total purchase consideration			$ 262,500,000
Goodwill				137,500,000	137,472,000
Acquisition-related expenses				$ 0	1,100,000	3,700,000
Total consideration paid to founders and key employees in restricted stock units			$ 10,500,000
Percent of total consideration deposited in escrow			10.00%
Identifiable intangible assets					123,100,000
Deferred revenue, period for recognition				1 year
Earn-out provision				$ 2,200,000
Expense recognized related to contingent earn-out provisions				0	2,200,000
Total revenue				75,300,000	75,300,000	41,800,000
(Loss) income before income taxes				(12,300,000)	$ (32,200,000)	$ (54,100,000)
Intangible assets, amortization expense				$ 24,600,000
Pro forma, Bulgaria statutory rate (as a percent)					10.00%
Pro forma, U.S. statutory rate (as a percent)					37.00%
Intellectual Property [Member] | Telerik AD [Member]
Business Acquisition [Line Items]
Identifiable intangible assets			$ 64,800,000
Customer Relationships [Member] | Telerik AD [Member]
Business Acquisition [Line Items]
Identifiable intangible assets			47,100,000
Trade Names [Member] | Telerik AD [Member]
Business Acquisition [Line Items]
Identifiable intangible assets			$ 11,200,000
Restricted Stock Units (RSUs) [Member]
Business Acquisition [Line Items]
Vesting period				3 years
Restricted Stock Units (RSUs) [Member] | DataRPM Corporation [Member]
Business Acquisition [Line Items]
Consideration payable in the form of restricted stock units		$ 1,700,000
Vesting period		2 years
Stock-based compensation				$ 400,000