Intangible Assets And Goodwill (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013	Nov. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	$ 64,336	$ 68,997
Intangible Assets, Accumulated Amortization	(54,386)	(63,878)
Total	9,950	5,119
Purchased Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	44,793	42,520
Intangible Assets, Accumulated Amortization	(36,712)	(40,066)
Total	8,081	2,454
Customer-Related And Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Amount	19,543	26,477
Intangible Assets, Accumulated Amortization	(17,674)	(23,812)
Total	$ 1,869	$ 2,665