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Restructuring (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2019 | Feb. 28, 2017 | Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses |  |  | $ 5,906 | $ 6,331 | $ 2,251
2020 Restructuring Activities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses |  |  | 3,947 |  |
Short-term restructuring reserves |  |  | 3,500 |  |
2019 Restructuring Activities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses |  |  | 108 | 2,494 |
2017 Restructuring Activities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses |  |  | 365 | 739 | $ 2,251
Percentage of reduction of global workforce (more than) |  | 20.00% |  |  |
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 |  |  | 1,486 | $ 3,098 |
Short-term restructuring reserves |  |  | $ 400 |  |
Trademarks and Trade Names | DataRPM and Kinvey |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Impairment of intangible assets | $ 22,700 |  |  |  |

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