Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Aug. 31, 2020	Nov. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 295,968	$ 295,968
Accumulated Amortization	(214,034)	(196,576)
Net Book Value	81,934	99,392
Purchased technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	135,186	135,186
Accumulated Amortization	(110,941)	(105,967)
Net Book Value	24,245	29,219
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	134,042	134,042
Accumulated Amortization	(84,624)	(74,175)
Net Book Value	49,418	59,867
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,740	24,740
Accumulated Amortization	(17,577)	(16,043)
Net Book Value	7,163	8,697
Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,000	2,000
Accumulated Amortization	(892)	(391)
Net Book Value	$ 1,108	$ 1,609