Intangible Assets And Goodwill (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2012	Nov. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	$ 68,997	$ 216,079
Intangible Assets, Accumulated Amortization	(63,878)	(151,671)
Intangible Assets, Net Book Value	5,119	64,408
Purchased Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	42,520	138,470
Intangible Assets, Accumulated Amortization	(40,066)	(96,759)
Intangible Assets, Net Book Value	2,454	41,711
Customer-Related And Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	26,477	77,609
Intangible Assets, Accumulated Amortization	(23,812)	(54,912)
Intangible Assets, Net Book Value	$ 2,665	$ 22,697