Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	May 31, 2016	Nov. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 200,136	$ 200,083
Accumulated Amortization	(100,272)	(85,970)
Net Book Value	99,864	114,113
Purchased technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	117,204	117,151
Accumulated Amortization	(62,895)	(54,963)
Net Book Value	54,309	62,188
Customer-related [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	67,602	67,602
Accumulated Amortization	(30,676)	(25,493)
Net Book Value	36,926	42,109
Trademarks and trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,330	15,330
Accumulated Amortization	(6,701)	(5,514)
Net Book Value	$ 8,629	$ 9,816