Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2013	Nov. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 64,267	$ 68,997
Accumulated Amortization	(53,577)	(63,878)
Net Book Value	10,690	5,119
Purchased technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	44,730	42,520
Accumulated Amortization	(36,117)	(40,066)
Net Book Value	8,613	2,454
Customer-related and other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19,537	26,477
Accumulated Amortization	(17,460)	(23,812)
Net Book Value	$ 2,077	$ 2,665