Carrying Values of Amortized Acquired Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2012	Nov. 30, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 366,556	$ 304,104
Accumulated Amortization	(234,652)	(206,846)
Net Carrying Amount	131,904	97,258
Developed Technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	180,294	146,289
Accumulated Amortization	(114,814)	(102,034)
Net Carrying Amount	65,480	44,255
Customer Contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	59,491	56,165
Accumulated Amortization	(41,780)	(37,376)
Net Carrying Amount	17,711	18,789
Patents/Core Technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	28,192	27,922
Accumulated Amortization	(23,713)	(21,542)
Net Carrying Amount	4,479	6,380
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,743	9,771
Accumulated Amortization	(7,965)	(7,077)
Net Carrying Amount	4,778	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	83,556	61,677
Accumulated Amortization	(45,658)	(38,237)
Net Carrying Amount	37,898	23,440
In-Process Research And Development
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,700	1,700
Accumulated Amortization	(142)
Net Carrying Amount	$ 1,558	$ 1,700