Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange ownership interest and registrations, impairment loss	$ 768	$ 291
Goodwill	1,646,933	1,643,599	$ 1,642,170
Goodwill impairment	3,000	0	0
Exchange and clearing organization membership interests and registrations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange ownership interest and registrations, impairment loss	468	291
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	0
Goodwill impairment	3,000
Impairment of intangible assets, finite-lived	300
Nonrecurring | Customer relationships and trade names
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross costs - finite lived intangible assets	0
Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, fair value	0
Finite-lived intangible assets, fair value disclosure	0
Nonrecurring | Exchange and clearing organization membership interests and registrations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange ownership interest and registrations, carrying value	1,974	2,443	2,663
Exchange ownership interest and registrations, impairment loss	468	291	9
Nonrecurring | Exchange and clearing organization membership interests and registrations | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange ownership interest and registrations, fair value	$ 1,974	$ 2,443	$ 2,663