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Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands | May 31, 2017 | Nov. 30, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 213,428 | $ 192,628
Accumulated Amortization | (126,564) | (111,801)
Net Book Value | 86,864 | 80,827
Purchased technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 129,786 | 109,886
Accumulated Amortization | (76,477) | (68,116)
Net Book Value | 53,309 | 41,770
Customer-related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 67,702 | 67,602
Accumulated Amortization | (41,033) | (35,852)
Net Book Value | 26,669 | 31,750
Trademarks and trade names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 15,940 | 15,140
Accumulated Amortization | (9,054) | (7,833)
Net Book Value | $ 6,886 | $ 7,307

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