Carrying Values of Amortized Acquired Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	May 31, 2012	Nov. 30, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 358,319	$ 304,104
Accumulated Amortization	(218,163)	(206,846)
Net Carrying Amount	140,156	97,258
Developed Technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	176,044	146,289
Accumulated Amortization	(106,439)	(102,034)
Net Carrying Amount	69,605	44,255
Customer Base
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	57,806	56,165
Accumulated Amortization	(39,026)	(37,376)
Net Carrying Amount	18,780	18,789
Patents/Core Technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,315	27,922
Accumulated Amortization	(22,455)	(21,542)
Net Carrying Amount	4,860	6,380
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,514	9,771
Accumulated Amortization	(7,498)	(7,077)
Net Carrying Amount	5,016	2,694
Non-Compete Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	580	580
Accumulated Amortization	(580)	(580)
Maintenance Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	82,360	61,677
Accumulated Amortization	(42,108)	(38,237)
Net Carrying Amount	40,252	23,440
In-Process Research And Development
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,700	1,700
Accumulated Amortization	(57)
Net Carrying Amount	$ 1,643	$ 1,700