Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Feb. 28, 2019	Nov. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 231,883	$ 239,843
Accumulated Amortization	(181,586)	(180,924)
Net Book Value	50,297	58,919	[1]
Purchased technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	146,501	154,301
Accumulated Amortization	(108,599)	(110,959)
Net Book Value	37,902	43,342
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	67,642	67,802
Accumulated Amortization	(58,901)	(56,589)
Net Book Value	8,741	11,213
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,740	17,740
Accumulated Amortization	(14,086)	(13,376)
Net Book Value	$ 3,654	$ 4,364

[1] The Company adopted ASC 606 effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Basis of Presentation for further information.