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Business Combinations (Narrative) (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 02, 2014 | Oct. 01, 2014 | May. 13, 2014 | May. 31, 2015 | May. 31, 2014 | May. 31, 2015 | May. 31, 2014 | Nov. 30, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 370,533,000 |  | $ 370,533,000 |  | $ 232,836,000
Stock-based compensation expense |  |  |  | 6,439,000 | $ 5,709,000 | 12,275,000 | $ 11,254,000 |
Acquisition-related costs |  |  |  | 1,010,000 | 1,630,000 | 2,518,000 | 2,576,000 |
Revenues |  |  |  | 88,817,000 | 80,827,000 | 170,198,000 | 155,365,000 |
(Loss) income before provision for income taxes |  |  |  | 3,760,000 | (20,151,000) | 14,014,000 | (34,159,000) |
Intangible assets, amortization expense |  |  |  | 7,300,000 | 700,000 | $ 15,100,000 | 1,400,000 |
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% |  |  |  |  |  |  |
Measurement period | 1 year |  |  |  |  |  |  |
Acquired intangible assets | $ 123,100,000 |  |  |  |  |  |  |
Deferred revenue, period for recognition | 12 months |  |  |  |  |  |  |
Goodwill | $ 137,921,000 |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  | 2 years |  |
Stock-based compensation expense |  |  |  | 700,000 |  | $ 1,400,000 |  |
Acquisition-related costs |  |  |  | 1,100,000 |  | 1,900,000 |  |
Earn-out provision | 2,500,000 |  |  |  |  |  |  |
Expense recognized related to contingent earn-out provisions |  |  |  | 600,000 |  | 1,200,000 |  |
Revenues |  |  |  | 9,200,000 |  | 13,700,000 |  |
(Loss) income before provision for income taxes |  |  |  | 7,800,000 |  | 18,700,000 |  |
Intangible assets, amortization expense |  |  |  |  |  | 12,300,000 |  |
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% |
Net assets acquired | 251,953,000 |  |  |  |  |  |  |
BravePoint Inc. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total purchase consideration |  | $ 12,000,000 |  |  |  |  |  |
Goodwill |  | $ 2,257,000 |  |  |  |  |  |
Acquisition-related costs |  |  |  |  | $ 600,000 | 900,000 |  |
Equity interests acquired |  | 100.00% |  |  |  |  |  |
Net assets acquired |  | $ 12,000,000 |  |  |  |  |  |
Modulus [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total purchase consideration |  |  | $ 15,000,000 |  |  |  |  |
Goodwill |  |  | $ 6,433,000 |  |  |  |  |
Equity interests acquired |  |  | 100.00% |  |  |  |  |
Purchase consideration, cash |  |  | $ 12,500,000 |  |  |  |  |
Purchase consideration, contingent consideration |  |  | $ 2,500,000 |  |  |  |  |
Expected payout period |  |  | 2 years |  |  |  |  |
Fair value of contingent liabilities |  |  | $ 1,500,000 |  |  |  |  |
Net assets acquired |  |  | $ 13,950,000 |  |  |  |  |
Change in fair value of contingent consideration |  |  |  | $ 1,100,000 |  | $ 1,200,000 |  |
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 Relationships [Member] | Telerik AD [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets | 47,100,000 |  |  |  |  |  |  |
Customer Relationships [Member] | BravePoint Inc. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets |  | $ 4,110,000 |  |  |  |  |  |
Trademarks and Trade Names [Member] | Telerik AD [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets | $ 11,200,000 |  |  |  |  |  |  |

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