Intangible Assets and Goodwill (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	May 31, 2013	Nov. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 64,181	$ 68,997
Accumulated Amortization	(52,751)	(63,878)
Net Book Value	11,430	5,119
Purchased technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	44,652	42,520
Accumulated Amortization	(35,509)	(40,066)
Net Book Value	9,143	2,454
Customer-related and other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19,529	26,477
Accumulated Amortization	(17,242)	(23,812)
Net Book Value	$ 2,287	$ 2,665