Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Feb. 29, 2016	Nov. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 200,136	$ 200,083
Accumulated Amortization	(93,148)	(85,970)
Net Book Value	106,988	114,113
Purchased technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	117,204	117,151
Accumulated Amortization	(58,956)	(54,963)
Net Book Value	58,248	62,188
Customer-related [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	67,602	67,602
Accumulated Amortization	(28,081)	(25,493)
Net Book Value	39,521	42,109
Trademarks and trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,330	15,330
Accumulated Amortization	(6,111)	(5,514)
Net Book Value	$ 9,219	$ 9,816