Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	May 31, 2019	Nov. 30, 2018
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Line Items]
Total gross costs - intangible assets	$ 262,288	$ 262,446
Accumulated amortization - finite lived intangible assets	(85,881)	(79,978)
Total net carrying amount - intangible assets	176,407	182,468
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	8,555	8,524
Net carrying amount - indefinite lived intangible assets	8,555	8,524
Customer relationships
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Line Items]
Gross costs - finite lived intangible assets	125,523	125,574
Accumulated amortization - finite lived intangible assets	(62,986)	(58,892)
Net carrying amount - finite lived intangible assets	$ 62,537	$ 66,682
Weighted average remaining lives (years)	10 years 2 months 12 days	10 years 7 months 6 days
Trade name
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Line Items]
Gross costs - finite lived intangible assets	$ 128,210	$ 128,348
Accumulated amortization - finite lived intangible assets	(22,895)	(21,086)
Net carrying amount - finite lived intangible assets	$ 105,315	$ 107,262
Weighted average remaining lives (years)	28 years 9 months 18 days	29 years 3 months 18 days