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Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands | Aug. 31, 2017 | Nov. 30, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 237,428 | $ 192,628
Accumulated Amortization | (135,651) | (111,801)
Net Book Value | 101,777 | 80,827
Purchased technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 151,886 | 109,886
Accumulated Amortization | (82,245) | (68,116)
Net Book Value | 69,641 | 41,770
Customer-related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 67,802 | 67,602
Accumulated Amortization | (43,632) | (35,852)
Net Book Value | 24,170 | 31,750
Trademarks and trade names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 17,740 | 15,140
Accumulated Amortization | (9,774) | (7,833)
Net Book Value | $ 7,966 | $ 7,307

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