Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 29, 2024	Aug. 31, 2024	Nov. 30, 2023
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Assets Acquired - finite-lived intangible assets		$ 63,676	$ 66,730
Impairment losses - indefinite lived intangible assets		(10)	(78)
Accumulated amortization - finite lived intangible assets		(169,793)	(146,443)
Total gross costs - intangible assets		345,471	276,711
Total net carrying amount - intangible assets		239,344	$ 196,920
OpNet
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Lives (Years)			20 years
Intangible assets increase (decrease)	$ 39,300
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		8,769	$ 7,405
Assets Acquired - indefinite-lived intangible assets		0	1,390
Impairment losses - indefinite lived intangible assets		(10)	(78)
Net carrying amount - indefinite lived intangible assets		8,759	8,717
Customer relationships
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross costs - finite lived intangible assets		136,848	126,449
Assets Acquired - finite-lived intangible assets		27,628	9,801
Impairment losses - indefinite lived intangible assets			0
Accumulated amortization - finite lived intangible assets		(103,756)	(93,966)
Net carrying amount - finite lived intangible assets		$ 60,720	$ 42,284
Weighted Average Remaining Lives (Years)		6 years	6 years 3 months 18 days
Trademarks and trade names
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross costs - finite lived intangible assets		$ 147,321	$ 127,899
Assets Acquired - finite-lived intangible assets		8,730	18,513
Impairment losses - indefinite lived intangible assets			0
Accumulated amortization - finite lived intangible assets		(43,944)	(39,340)
Net carrying amount - finite lived intangible assets		$ 112,107	$ 107,072
Weighted Average Remaining Lives (Years)		21 years 7 months 6 days	23 years 6 months
Other
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross costs - finite lived intangible assets		$ 52,533	$ 14,958
Assets Acquired - finite-lived intangible assets		27,318	37,026
Impairment losses - indefinite lived intangible assets			0
Accumulated amortization - finite lived intangible assets		(22,093)	(13,137)
Net carrying amount - finite lived intangible assets		$ 57,758	$ 38,847
Weighted Average Remaining Lives (Years)		4 years 3 months 18 days	5 years