Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Aug. 31, 2019	Nov. 30, 2018
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Total gross costs - intangible assets	$ 261,182	$ 262,446
Accumulated amortization - finite lived intangible assets	(88,489)	(79,978)
Impairment loss	(291)
Total net carrying amount - intangible assets	172,402	182,468
Exchange and clearing organization membership interests and registrations
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross costs - indefinite lived intangible assets	8,516	8,524
Impairment loss	(291)
Net carrying amount - indefinite lived intangible assets	8,225	8,524
Customer relationships
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross costs - finite lived intangible assets	125,066	125,574
Accumulated amortization - finite lived intangible assets	(64,792)	(58,892)
Net carrying amount - finite lived intangible assets	$ 60,274	$ 66,682
Weighted average remaining lives (years)	10 years 1 month 6 days	10 years 7 months 6 days
Trade name
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross costs - finite lived intangible assets	$ 127,600	$ 128,348
Accumulated amortization - finite lived intangible assets	(23,697)	(21,086)
Net carrying amount - finite lived intangible assets	$ 103,903	$ 107,262
Weighted average remaining lives (years)	28 years 6 months	29 years 3 months 18 days