Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
	Aug. 01, 2017	Feb. 28, 2017	Aug. 31, 2017	Nov. 30, 2016
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Line Items]
Total gross costs - intangible assets			$ 263,645	$ 262,474
Impairment losses			(401)
Accumulated amortization - finite lived intangible assets			(65,212)	(56,003)
Total net carrying amount - intangible assets			198,032	206,471
Exchange and clearing organization membership interests and registrations
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Line Items]
Gross costs - indefinite lived intangible assets			9,135	9,041
Impairment losses	$ (44)	$ (357)	(401)
Net carrying amount - indefinite lived intangible assets			8,734	9,041
Customer relationships
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Line Items]
Gross costs - finite lived intangible assets			125,919	125,381
Accumulated amortization - finite lived intangible assets			(48,679)	(42,283)
Net carrying amount - finite lived intangible assets			$ 77,240	$ 83,098
Weighted average remaining lives (years)			11 years 6 months	12 years 1 month
Trade name
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Line Items]
Gross costs - finite lived intangible assets			$ 128,591	$ 128,052
Accumulated amortization - finite lived intangible assets			(16,533)	(13,720)
Net carrying amount - finite lived intangible assets			$ 112,058	$ 114,332
Weighted average remaining lives (years)			30 years 6 months	31 years 4 months