Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Nov. 30, 2017	Nov. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	$ 239,843	$ 192,628
Intangible Assets, Accumulated Amortization	(144,949)	(111,801)
Total	94,894	80,827
Purchased Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	154,301	109,886
Intangible Assets, Accumulated Amortization	(88,224)	(68,116)
Total	66,077	41,770
Customer Related [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	67,802	67,602
Intangible Assets, Accumulated Amortization	(46,230)	(35,852)
Total	21,572	31,750
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	17,740	15,140
Intangible Assets, Accumulated Amortization	(10,495)	(7,833)
Total	$ 7,245	$ 7,307