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Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Nov. 30, 2018	Nov. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 239,843	$ 239,843
Accumulated Amortization	(180,924)	(144,949)
Total	58,919	94,894
Purchased technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	154,301	154,301
Accumulated Amortization	(110,959)	(88,224)
Total	43,342	66,077
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	67,802	67,802
Accumulated Amortization	(56,589)	(46,230)
Total	11,213	21,572
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,740	17,740
Accumulated Amortization	(13,376)	(10,495)
Total	$ 4,364	$ 7,245

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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