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Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified | Aug. 31, 2013 | Nov. 30, 2012
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 64,267 | $ 68,997
Accumulated Amortization | (53,577) | (63,878)
Net Book Value | 10,690 | 5,119
Purchased technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 44,730 | 42,520
Accumulated Amortization | (36,117) | (40,066)
Net Book Value | 8,613 | 2,454
Customer-related and other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 19,537 | 26,477
Accumulated Amortization | (17,460) | (23,812)
Net Book Value | $ 2,077 | $ 2,665

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