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Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands | Feb. 28, 2017 | Nov. 30, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 192,628 | $ 192,628
Accumulated Amortization | (118,658) | (111,801)
Net Book Value | 73,970 | 80,827
Purchased technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 109,886 | 109,886
Accumulated Amortization | (71,795) | (68,116)
Net Book Value | 38,091 | 41,770
Customer-related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 67,602 | 67,602
Accumulated Amortization | (38,440) | (35,852)
Net Book Value | 29,162 | 31,750
Trademarks and trade names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 15,140 | 15,140
Accumulated Amortization | (8,423) | (7,833)
Net Book Value | $ 6,717 | $ 7,307

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