Business Combinations (Narrative) (Details) (USD $)	3 Months Ended		0 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Dec. 02, 2014 developer	Oct. 01, 2014	May 13, 2014	Nov. 30, 2014
Business Acquisition [Line Items]
Stock-based compensation expense	$ 5,836,000	$ 5,545,000
Goodwill	370,625,000					232,836,000
Acquisition-related costs	1,506,000	946,000
Revenues	81,381,000	74,538,000
(Loss) income before provision for income taxes	10,253,000	(14,008,000)
Intangible assets, amortization expense	7,800,000	700,000
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%
Number of developers			1,400,000
Measurement period			1 year
Acquired intangible assets			123,100,000
Award vesting period	2 years
Stock-based compensation expense	700,000
Net assets acquired			251,953,000
Goodwill			137,921,000
Acquisition-related costs	800,000
Earn-out provision			2,500,000
Expense recognized related to contingent earn-out provisions	600,000
Revenues	4,500,000
(Loss) income before provision for income taxes	10,900,000
Intangible assets, amortization expense	6,200,000
Pro forma amortization adjustment		123,100,000
Pro forma adjustments, statutory tax rate, Bulgaria (as a percent)		10.00%
Pro forma adjustments, statutory tax rate, United States (as a percent)		37.00%
BravePoint Inc. [Member]
Business Acquisition [Line Items]
Equity interests acquired				100.00%
Total purchase consideration				12,000,000.0
Net assets acquired				12,000,000
Goodwill				2,257,000
Acquisition-related costs	300,000
Modulus [Member]
Business Acquisition [Line Items]
Equity interests acquired					100.00%
Total purchase consideration					15,000,000
Acquired intangible assets					7,320,000
Purchase consideration, cash					12,500,000
Purchase consideration, contingent consideration					2,500,000
Fair value of contingent liabilities					1,500,000
Net assets acquired					13,950,000
Goodwill					6,433,000
Expected payout period					2 years
Change in fair value of contingent consideration	100,000
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 Relationships [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