Accrued Restructuring and Excess Facilities Costs (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012	Aug. 31, 2011
Restructuring Cost and Reserve [Line Items]
Beginning Balance			$ 7,842
Restructuring adjustment	72	143	(447)	110
Adjustment to acquisition integration costs			(150)
Cash utilized			(5,440)
Ending Balance	1,805		1,805
Accrued Acquisition Integration
Restructuring Cost and Reserve [Line Items]
Beginning Balance			41
Adjustment to acquisition integration costs			(3)
Ending Balance	38		38
Accrued Facilities Restructuring
Restructuring Cost and Reserve [Line Items]
Beginning Balance			2,782
Restructuring adjustment			(1)
Adjustment to acquisition integration costs			(317)
Cash utilized			(1,139)
Ending Balance	1,325		1,325
Accrued Severance and Other
Restructuring Cost and Reserve [Line Items]
Beginning Balance			5,019
Restructuring adjustment			(446)
Adjustment to acquisition integration costs			170
Cash utilized			(4,301)
Ending Balance	$ 442		$ 442