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Restructuring Charges (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2020 | Aug. 31, 2019 | Nov. 30, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses | $ 91,000 | $ 801,000 | $ 1,826,000 | $ 3,993,000 |
Restructuring reserve | 882,000 |  | 882,000 |  | $ 2,203,000
Operating lease, impairment loss |  |  | 1,200,000 |  |
2019 Restructuring Activities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses | 0 |  | 109,000 |  |
Restructuring reserve | 165,000 |  | 165,000 |  | 1,460,000
2019 Restructuring Activities | Other Accrued Liabilities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring reserve | 200,000 |  | 200,000 |  |
2017 Restructuring Activities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring expenses |  |  | 1,448,000 |  |
Restructuring reserve | 659,000 |  | 659,000 |  | $ 552,000
2017 Restructuring Activities | Other Accrued Liabilities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring reserve | $ 700,000 |  | $ 700,000 |  |

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- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121593497&loc=SL77918431-209957 + Details
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