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Restructuring (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2019 | Feb. 28, 2017 | Nov. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses |  |  | $ 6,331 | $ 2,251 | $ 22,210
2019 Restructuring Activities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses |  |  | 2,494 |  |
Short-term restructuring reserves | $ 1,500 |  | 1,500 |  |
2017 Restructuring Activities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses |  |  | 739 | $ 2,251 | $ 22,125
Percentage of reduction of global workforce (more than) |  | 20.00% |  |  |
Other Accrued Liabilities | 2017 Restructuring Activities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Short-term restructuring reserves | 200 |  | 200 |  |
DataRPM and Kinvey |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Impairment of intangible assets | 22,700 |  |  |  |
Ipswitch | 2019 Restructuring Activities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses |  |  | 3,098 |  |
Short-term restructuring reserves | 600 |  | $ 600 |  |
Trademarks and trade names | DataRPM and Kinvey |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Impairment of intangible assets | $ 22,700 |  |  |  |

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