Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	May 31, 2018	Nov. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 239,843	$ 239,843
Accumulated Amortization	(163,303)	(144,949)
Net Book Value	76,540	94,894
Purchased technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	154,301	154,301
Accumulated Amortization	(99,942)	(88,224)
Net Book Value	54,359	66,077
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	67,802	67,802
Accumulated Amortization	(51,426)	(46,230)
Net Book Value	16,376	21,572
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,740	17,740
Accumulated Amortization	(11,935)	(10,495)
Net Book Value	$ 5,805	$ 7,245