Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Feb. 28, 2018	Nov. 30, 2017
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Line Items]
Total gross costs - intangible assets	$ 265,054	$ 264,333
Accumulated amortization - finite lived intangible assets	(71,718)	(68,540)
Total net carrying amount - intangible assets	193,336	195,793
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	8,619	8,551
Net carrying amount - indefinite lived intangible assets	8,619	8,551
Customer relationships
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Line Items]
Gross costs - finite lived intangible assets	126,673	126,412
Accumulated amortization - finite lived intangible assets	(53,180)	(50,983)
Net carrying amount - finite lived intangible assets	$ 73,493	$ 75,429
Weighted average remaining lives (years)	11 years 1 month	11 years 3 months
Trade name
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Line Items]
Gross costs - finite lived intangible assets	$ 129,762	$ 129,370
Accumulated amortization - finite lived intangible assets	(18,538)	(17,557)
Net carrying amount - finite lived intangible assets	$ 111,224	$ 111,813
Weighted average remaining lives (years)	30 years	30 years 3 months