Exit Costs - Restructuring and Impairment Costs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Aug. 31, 2015	Aug. 31, 2015
Restructuring Cost and Reserve [Line Items]
Impairment costs	$ 33,273	$ 61,843
Compensation and Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	13,815	33,834
Technology and Communications [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	17,935	24,195
Professional Services [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	444	2,477
Other Expense [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	1,079	1,337
Severance Costs [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	11,373	26,932
Accelerated Amortization of Restricted Stock and Restricted Cash Awards [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	2,442	6,902
Accelerated Amortization of Capitalized Software [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	6,719	12,979
Contract Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	11,216	11,216
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	$ 1,523	$ 3,814