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Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands | Aug. 31, 2020 | Nov. 30, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 295,968 | $ 295,968
Accumulated Amortization | (214,034) | (196,576)
Net Book Value | 81,934 | 99,392
Purchased technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 135,186 | 135,186
Accumulated Amortization | (110,941) | (105,967)
Net Book Value | 24,245 | 29,219
Customer-related |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 134,042 | 134,042
Accumulated Amortization | (84,624) | (74,175)
Net Book Value | 49,418 | 59,867
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 24,740 | 24,740
Accumulated Amortization | (17,577) | (16,043)
Net Book Value | 7,163 | 8,697
Non-compete agreement |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,000 | 2,000
Accumulated Amortization | (892) | (391)
Net Book Value | $ 1,108 | $ 1,609

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