Goodwill and Other Acquired Intangible Assets (Schedule Of Carrying Values Of Amortized Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013	Nov. 30, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, intangible assets subject to amortization	$ 402,613	$ 367,091
Accumulated Amortization, intangible assets subject to amortization	(283,195)	(243,830)
Total intangible assets subject to amortization	119,418	123,261
Developed technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, intangible assets subject to amortization	204,918	182,152
Accumulated Amortization, intangible assets subject to amortization	(137,758)	(118,992)
Total intangible assets subject to amortization	67,160	63,160
Customer base
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, intangible assets subject to amortization	67,707	59,525
Accumulated Amortization, intangible assets subject to amortization	(50,623)	(43,328)
Total intangible assets subject to amortization	17,084	16,197
Patents/core technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, intangible assets subject to amortization	28,649	28,295
Accumulated Amortization, intangible assets subject to amortization	(26,080)	(24,198)
Total intangible assets subject to amortization	2,569	4,097
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, intangible assets subject to amortization	12,871	12,777
Accumulated Amortization, intangible assets subject to amortization	(9,377)	(8,251)
Total intangible assets subject to amortization	3,494	4,526
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, intangible assets subject to amortization	580	580
Accumulated Amortization, intangible assets subject to amortization	(580)	(580)
Total intangible assets subject to amortization	0	0
Maintenance agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, intangible assets subject to amortization	87,888	83,762
Accumulated Amortization, intangible assets subject to amortization	(58,777)	(48,481)
Total intangible assets subject to amortization	$ 29,111	$ 35,281