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Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands | Feb. 29, 2016 | Nov. 30, 2015
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 200,136 | $ 200,083
Accumulated Amortization | (93,148) | (85,970)
Net Book Value | 106,988 | 114,113
Purchased technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 117,204 | 117,151
Accumulated Amortization | (58,956) | (54,963)
Net Book Value | 58,248 | 62,188
Customer-related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 67,602 | 67,602
Accumulated Amortization | (28,081) | (25,493)
Net Book Value | 39,521 | 42,109
Trademarks and trade names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 15,330 | 15,330
Accumulated Amortization | (6,111) | (5,514)
Net Book Value | $ 9,219 | $ 9,816

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