Business Combinations (Narrative) (Details) - USD ($)			3 Months Ended	12 Months Ended
	Dec. 02, 2014	May 13, 2014	Aug. 31, 2016	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014	Oct. 01, 2014
Business Acquisition [Line Items]
Goodwill				$ 278,067,000	$ 369,985,000	$ 232,836,000
Acquisition-related expenses				1,240,000	4,239,000	5,862,000
Intangible assets, amortization expense				28,200,000	29,600,000	3,700,000
Changes in fair value of contingent consideration obligation				0	1,508,000	(89,000)
Impairment of intangible assets				5,051,000	0	$ 0
Telerik AD [Member]
Business Acquisition [Line Items]
Total purchase consideration	$ 262,500,000
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
Goodwill				137,500,000	137,472,000
Acquisition-related expenses				$ 1,100,000	3,700,000
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	41,800,000
(Loss) income before income taxes				(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%
Fair value of purchase consideration					$ 251,953,000
BravePoint Inc. [Member]
Business Acquisition [Line Items]
Goodwill							$ 2,257,000
Acquisition-related expenses				200,000	1,200,000
Equity interests (as a percent)							100.00%
Fair value of purchase consideration							$ 12,000,000
Modulus [Member]
Business Acquisition [Line Items]
Total purchase consideration		$ 15,000,000
Goodwill		$ 6,433,000
Acquisition-related expenses				$ 300,000
Equity interests (as a percent)		100.00%
Fair value of purchase consideration		$ 13,950,000
Purchase consideration, cash		12,500,000
Purchase consideration, contingent consideration		$ 2,500,000
Expected payout period		2 years
Contingent consideration		$ 1,500,000
Discount rate				33.00%
Changes in fair value of contingent consideration obligation				$ 1,500,000	$ (1,500,000)
Impairment of intangible assets			$ 5,100,000
Minimum [Member] | Modulus [Member]
Business Acquisition [Line Items]
Probability milestones associated with contingent consideration will be achieved				75.00%
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
Trademarks and Trade Names [Member] | Telerik AD [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	11,200,000
Credit Agreement [Member]
Business Acquisition [Line Items]
Issuance of debt, face amount	$ 150,000,000