Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2014	Nov. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 64,326	$ 64,336
Accumulated Amortization	(55,069)	(54,386)
Net Book Value	9,257	9,950
Purchased technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	44,780	44,793
Accumulated Amortization	(37,226)	(36,712)
Net Book Value	7,554	8,081
Customer-related and other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19,546	19,543
Accumulated Amortization	(17,843)	(17,674)
Net Book Value	$ 1,703	$ 1,869

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=26713463&loc=d3e16323-109275

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- Definition

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

+ References

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- Definition

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

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