Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	May 31, 2019	Nov. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 343,183	$ 239,843
Accumulated Amortization	(192,276)	(180,924)
Net Book Value	150,907	58,919
Purchased technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	179,601	154,301
Accumulated Amortization	(114,703)	(110,959)
Net Book Value	64,898	43,342
Customer-related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	134,242	67,802
Accumulated Amortization	(62,543)	(56,589)
Net Book Value	71,699	11,213
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,340	17,740
Accumulated Amortization	(14,973)	(13,376)
Net Book Value	12,367	4,364
Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,000	0
Accumulated Amortization	(57)	0
Net Book Value	$ 1,943	$ 0