Accrued Restructuring And Acquisition Integration Costs (Accrued Restructuring And Integration Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2009
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 3,227	$ 6,931	$ 12,166
Acquisition integration costs	(242)		1,599
Restructuring adjustment			(721)
Restructuring charges	8,926	6,953
Cash utilized	(4,069)	(10,816)	(6,113)
Restructuring reserve, ending balance	7,842	3,227	6,931
Accrued Excess Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	1,118	6,211	10,752
Acquisition integration costs		159	579
Restructuring charges	2,405	1,498
Cash utilized	(700)	(6,591)	(5,120)
Restructuring reserve, ending balance	2,823	1,118	6,211
Accrued Excess Facilities [Member] | Headquarter Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	138	5,811	10,629
Restructuring charges		(250)
Cash utilized	(138)	(5,423)	(4,818)
Restructuring reserve, ending balance		138	5,811
Accrued Excess Facilities [Member] | Acquisition Integration [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	56	400	123
Acquisition integration costs			579
Cash utilized	(15)	(344)	(302)
Restructuring reserve, ending balance	41	56	400
Accrued Excess Facilities [Member] | Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	924
Restructuring charges	2,405	1,748
Cash utilized	(547)	(824)
Restructuring reserve, ending balance	2,782	924
Accrued Severance And Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	2,109	720	1,414
Acquisition integration costs	(242)	159	1,020
Restructuring adjustment			(721)
Restructuring charges	6,521	5,455
Cash utilized	(3,369)	(4,225)	(993)
Restructuring reserve, ending balance	5,019	2,109	720
Accrued Severance And Other [Member] | Acquisition Integration [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	11	720	1,414
Acquisition integration costs			1,020
Restructuring adjustment			(721)
Cash utilized	(11)	(868)	(993)
Restructuring reserve, ending balance		11	720
Accrued Severance And Other [Member] | Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	2,098
Acquisition integration costs	(242)	159
Restructuring charges	6,521	5,455
Cash utilized	(3,358)	(3,357)
Restructuring reserve, ending balance	$ 5,019	$ 2,098