Exit Costs - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2017	May 31, 2016
Restructuring Cost and Reserve [Line Items]
Pre-tax losses before income taxes	$ (116,181)	$ (102,597)	$ (240,380)	$ 147,279
Non-cash restructuring costs		30		341
Futures business [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax losses before income taxes		$ 600		$ 1,900