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Restructuring Charges (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Feb. 29, 2020 | Nov. 30, 2019 | Feb. 28, 2019
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expenses | $ 1,040 |  | $ 415
Ipswitch |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment of intangible assets |  | $ 900 |
Technologies And Trade Names | DataRPM and Kinvey |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment of intangible assets |  | $ 22,700 |
2019 Restructuring Activities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 600 |  |
Restructuring expenses | (9) |  |
2019 Restructuring Activities | Ipswitch |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 1,000 |  |
Restructuring expenses | 1,036 |  |
2019 Restructuring Activities | Ipswitch | Short-Term Lease Liability |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 800 |  |
2019 Restructuring Activities | Ipswitch | Other Accrued Liabilities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | $ 200 |  |

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