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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, 2025
Nov. 30, 2024
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Assets Acquired - finite-lived intangible assets   $ 721 $ 61,299
Impairment losses - indefinite lived intangible assets     (10)
Accumulated amortization - finite lived intangible assets   (212,901) (176,644)
Total gross costs - intangible assets   424,488 341,726
Total net carrying amount - intangible assets   212,308 226,371
OpNet      
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
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   8,781 8,715
Assets Acquired - indefinite-lived intangible assets   0 0
Impairment losses - indefinite lived intangible assets     (10)
Net carrying amount - indefinite lived intangible assets   8,781 8,705
Customer relationships      
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Gross costs - finite lived intangible assets   166,958 136,049
Assets Acquired - finite-lived intangible assets   622 26,450
Impairment losses - indefinite lived intangible assets     0
Accumulated amortization - finite lived intangible assets   (114,341) (104,539)
Net carrying amount - finite lived intangible assets   $ 53,239 $ 57,960
Weighted Average Remaining Lives (Years)   5 years 1 month 6 days 5 years 7 months 6 days
Trademarks and trade names      
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Gross costs - finite lived intangible assets   $ 161,280 $ 146,032
Assets Acquired - finite-lived intangible assets   0 8,533
Impairment losses - indefinite lived intangible assets     0
Accumulated amortization - finite lived intangible assets   (54,358) (45,412)
Net carrying amount - finite lived intangible assets   $ 106,922 $ 109,153
Weighted Average Remaining Lives (Years)   20 years 10 months 24 days 21 years 4 months 24 days
Other      
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Gross costs - finite lived intangible assets   $ 87,469 $ 50,930
Assets Acquired - finite-lived intangible assets   99 26,316
Impairment losses - indefinite lived intangible assets     0
Accumulated amortization - finite lived intangible assets   (44,202) (26,693)
Net carrying amount - finite lived intangible assets   $ 43,366 $ 50,553
Weighted Average Remaining Lives (Years)   3 years 7 months 6 days 3 years 10 months 24 days