Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Feb. 28, 2017	Nov. 30, 2016
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

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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

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