Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Aug. 31, 2018	Nov. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 239,843	$ 239,843
Accumulated Amortization	(172,131)	(144,949)
Net Book Value	67,712	94,894
Purchased technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	154,301	154,301
Accumulated Amortization	(105,451)	(88,224)
Net Book Value	48,850	66,077
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	67,802	67,802
Accumulated Amortization	(54,024)	(46,230)
Net Book Value	13,778	21,572
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,740	17,740
Accumulated Amortization	(12,656)	(10,495)
Net Book Value	$ 5,084	$ 7,245