Accrued Restructuring And Excess Facilities Costs (Accrued Restructuring And Excess Facilities Costs) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2011	Aug. 31, 2010
Restructuring reserve, beginning balance			$ 3,227
Adjustment to acquisition integration costs			(33)
Restructuring charges	143	561		6,832
Cash utilized			(1,933)
Restructuring reserve, ending balance	1,404		1,404
Accrued Excess Facilities [Member]
Restructuring reserve, beginning balance			1,118
Cash utilized			(400)
Restructuring reserve, ending balance	718		718
Accrued Excess Facilities [Member] | Headquarter Facilities [Member]
Restructuring reserve, beginning balance			138
Cash utilized			(69)
Restructuring reserve, ending balance	69		69
Accrued Excess Facilities [Member] | Acquisition Integration [Member]
Restructuring reserve, beginning balance			56
Cash utilized			(12)
Restructuring reserve, ending balance	44		44
Accrued Excess Facilities [Member] | Restructuring [Member]
Restructuring reserve, beginning balance			924
Cash utilized			(319)
Restructuring reserve, ending balance	605		605
Accrued Severance And Other [Member]
Restructuring reserve, beginning balance			2,109
Adjustment to acquisition integration costs			(33)
Restructuring charges			143
Cash utilized			(1,533)
Restructuring reserve, ending balance	686		686
Accrued Severance And Other [Member] | Acquisition Integration [Member]
Restructuring reserve, beginning balance			11
Cash utilized			(11)
Accrued Severance And Other [Member] | Restructuring [Member]
Restructuring reserve, beginning balance			2,098
Adjustment to acquisition integration costs			(33)
Restructuring charges			143
Cash utilized			(1,522)
Restructuring reserve, ending balance	$ 686		$ 686