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Intangible Assets and Goodwill (Narrative) (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2016 USD ($) | Aug. 31, 2016 USD ($) | Nov. 30, 2016 USD ($) product_lines | Nov. 30, 2015 USD ($) | Nov. 30, 2014 USD ($) | May 13, 2014 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, amortization expense |  |  | $ 28,200,000 | $ 29,600,000 | $ 3,700,000 |
Impairment of intangible assets |  |  | 5,051,000 | 0 | 0 |
Goodwill [Line Items] |  |  |  |  |  |
Impairment of goodwill |  |  | 92,000,000 | 0 | 0 |
Goodwill | $ 278,067,000 |  | 278,067,000 | 369,985,000 | $ 232,836,000 |
OpenEdge [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Impairment of goodwill |  |  | 0 |  |  |
Goodwill | 212,062,000 |  | 212,062,000 | 211,980,000 |  |
Data Connectivity and Integration [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Impairment of goodwill |  |  | 0 |  |  |
Goodwill | 19,040,000 |  | $ 19,040,000 | 19,040,000 |  |
Application Development and Deployment [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of products combined | product_lines |  |  | 2 |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Impairment of goodwill | 92,000,000 |  | $ 92,000,000 |  |  |
Goodwill | $ 46,965,000 |  | $ 46,965,000 | $ 138,965,000 |  |
Modulus [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Impairment of intangible assets |  | $ 5,100,000 |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Discount rate |  |  | 33.00% |  |  |
Goodwill |  |  |  |  |  | $ 6,433,000
Modulus [Member] | Purchased Technology [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Impairment of intangible assets |  | $ 5,100,000 |  |  |  |
Income Approach [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted average attributable to valuation technique (as a percent) |  |  | 50.00% |  |  |
Public Company Method [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted average attributable to valuation technique (as a percent) |  |  | 40.00% |  |  |
Guideline Transaction Method [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Weighted average attributable to valuation technique (as a percent) |  |  | 10.00% |  |  |
Goodwill [Member] | OpenEdge [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Discount rate | 9.80% |  |  |  |  |
Goodwill [Member] | Data Connectivity and Integration [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Discount rate | 12.00% |  |  |  |  |
Goodwill [Member] | Application Development and Deployment [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Discount rate | 13.80% |  |  |  |  |

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