Business Combinations (Narrative) (Details) - USD ($)		3 Months Ended
	Dec. 02, 2014	Feb. 29, 2016	Feb. 28, 2015	Nov. 30, 2015
Business Acquisition [Line Items]
Goodwill		$ 369,964,000		$ 369,985,000
Stock-based compensation expense		6,937,000	$ 5,836,000
Acquisition-related costs		72,000	1,506,000
Total revenue		89,481,000	81,381,000
Income (loss) before income taxes		4,880,000	(10,253,000)
Intangible assets, amortization expense		7,100,000	7,800,000
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 into escrow	10.00%
Acquired intangible assets	$ 123,100,000
Goodwill	137,472,000
Stock-based compensation expense		1,600,000	700,000
Acquisition-related costs			800,000
Earn-out provision	$ 2,500,000
Service period	1 year
Expense recognized related to contingent earn-out provisions		0	600,000
Total revenue		18,100,000	4,500,000
Income (loss) before income taxes		(4,900,000)	(17,100,000)
Intangible assets, amortization expense		$ 6,200,000	$ 6,200,000
Credit Agreement [Member]
Business Acquisition [Line Items]
Term loan	$ 150,000,000
Existing Technology [Member] | Telerik AD [Member]
Business Acquisition [Line Items]
Acquired intangible assets	64,800,000
Customer-related [Member] | Telerik AD [Member]
Business Acquisition [Line Items]
Acquired intangible assets	47,100,000
Trademarks and Trade Names [Member] | Telerik AD [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 11,200,000