Goodwill and Intangible Assets Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Aug. 01, 2017	Aug. 01, 2016	Feb. 28, 2017	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill				$ 1,647,089	$ 1,640,653	$ 1,656,588
Impairment losses				613	1,284
Aggregate amortization expense				11,900	12,000	$ 12,200
Exchange and clearing organization membership interests and registrations
Finite-Lived Intangible Assets [Line Items]
Impairment losses	$ 44	$ 1,300	$ 569	613	1,284
Capital Markets
Finite-Lived Intangible Assets [Line Items]
Goodwill				$ 1,644,089	$ 1,637,653