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Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands | Feb. 28, 2019 | Nov. 30, 2018
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Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 231,883 | $ 239,843 |
Accumulated Amortization | (181,586) | (180,924) |
Net Book Value | 50,297 | 58,919 | [1]
Purchased technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 146,501 | 154,301 |
Accumulated Amortization | (108,599) | (110,959) |
Net Book Value | 37,902 | 43,342 |
Customer-related |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 67,642 | 67,802 |
Accumulated Amortization | (58,901) | (56,589) |
Net Book Value | 8,741 | 11,213 |
Trademarks and trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 17,740 | 17,740 |
Accumulated Amortization | (14,086) | (13,376) |
Net Book Value | $ 3,654 | $ 4,364 |
[1] | The Company adopted ASC 606 effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Basis of Presentation for further information.

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