GOODWILL AND ACQUIRED INTANGIBLE ASSETS - Carrying Values of Amortized Acquired Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	Nov. 30, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 364,933	$ 367,091
Accumulated Amortization	(250,825)	(243,830)
Net Carrying Amount	114,108	123,261
Developed technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	181,374	182,152
Accumulated Amortization	(122,805)	(118,992)
Net Carrying Amount	58,569	63,160
Customer base
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	59,346	59,525
Accumulated Amortization	(44,721)	(43,328)
Net Carrying Amount	14,625	16,197
Patents/core technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,717	28,295
Accumulated Amortization	(24,003)	(24,198)
Net Carrying Amount	3,714	4,097
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,570	12,777
Accumulated Amortization	(8,343)	(8,251)
Net Carrying Amount	4,227	4,526
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	580	580
Accumulated Amortization	(580)	(580)
Net Carrying Amount	0	0
Maintenance agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	83,346	83,762
Accumulated Amortization	(50,373)	(48,481)
Net Carrying Amount	$ 32,973	$ 35,281