Exit Costs - Restructuring and Impairment Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Restructuring Cost and Reserve [Line Items]
Impairment costs	$ 0	$ 33,273	$ 1,854	$ 61,843
Compensation and Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	0	13,815	320	33,834
Technology and Communications [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	0	17,935	1,234	24,195
Professional Services [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	0	444	0	2,477
Other Expense [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	0	1,079	300	1,337
Severance Costs [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	0	11,373	279	26,932
Accelerated Amortization of Restricted Stock and Restricted Cash Awards [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	0	2,442	41	6,902
Accelerated Amortization of Capitalized Software [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	0	6,719	0	12,979
Contract Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	0	11,216	1,234	11,216
Other Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Impairment costs	$ 0	$ 1,523	$ 300	$ 3,814