Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Aug. 31, 2016	Nov. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 192,622	$ 200,083
Accumulated Amortization	(104,938)	(85,970)
Net Book Value	87,684	114,113
Purchased technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	109,880	117,151
Accumulated Amortization	(64,438)	(54,963)
Net Book Value	45,442	62,188
Customer-related [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	67,602	67,602
Accumulated Amortization	(33,257)	(25,493)
Net Book Value	34,345	42,109
Trademarks and trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,140	15,330
Accumulated Amortization	(7,243)	(5,514)
Net Book Value	$ 7,897	$ 9,816