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Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands | May 31, 2018 | Nov. 30, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 239,843 | $ 239,843
Accumulated Amortization | (163,303) | (144,949)
Net Book Value | 76,540 | 94,894
Purchased technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 154,301 | 154,301
Accumulated Amortization | (99,942) | (88,224)
Net Book Value | 54,359 | 66,077
Customer-related |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 67,802 | 67,802
Accumulated Amortization | (51,426) | (46,230)
Net Book Value | 16,376 | 21,572
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 17,740 | 17,740
Accumulated Amortization | (11,935) | (10,495)
Net Book Value | $ 5,805 | $ 7,245

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