Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Aug. 31, 2020	Nov. 30, 2019
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Total gross costs - intangible assets	$ 263,628	$ 262,599
Total impairment losses	(768)
Accumulated amortization - finite lived intangible assets	(101,393)	(92,057)
Total net carrying amount - intangible assets	161,467	170,542
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	8,342	8,273
Impairment losses - indefinite lived intangible assets	(468)
Net carrying amount - indefinite lived intangible assets	7,874	8,273
Customer relationships
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross costs - finite lived intangible assets	126,132	125,736
Impairment losses - finite lived intangible assets	(26)
Accumulated amortization - finite lived intangible assets	(73,720)	(67,257)
Net carrying amount - finite lived intangible assets	$ 52,386	$ 58,479
Weighted average remaining lives (years)	9 years 6 months	9 years 10 months 24 days
Trade name
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross costs - finite lived intangible assets	$ 129,154	$ 128,590
Impairment losses - finite lived intangible assets	(274)
Accumulated amortization - finite lived intangible assets	(27,673)	(24,800)
Net carrying amount - finite lived intangible assets	$ 101,207	$ 103,790
Weighted average remaining lives (years)	27 years 6 months	28 years 3 months 18 days