Intangible Assets, Net and Goodwill (Schedule of Intangible Assets, Net And Goodwill) (Details) - USD ($) $ in Thousands	May 31, 2020	Nov. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Amortizable intangibles	$ 173,712	$ 182,954
Goodwill	1,736,492	1,739,980
Total intangible assets, net and goodwill	1,910,204	1,922,934
Real estate
Finite-Lived Intangible Assets [Line Items]
Goodwill	36,711	36,711
Other operations
Finite-Lived Intangible Assets [Line Items]
Goodwill	3,459	3,459
Investment Banking and Capital Markets
Finite-Lived Intangible Assets [Line Items]
Goodwill	1,553,322	1,556,810
Asset Management
Finite-Lived Intangible Assets [Line Items]
Goodwill	143,000	143,000
Historical Investment Banking, Capital Markets and Asset Management Segment
Finite-Lived Intangible Assets [Line Items]
Goodwill		1,699,800
Customer and other relationships
Finite-Lived Intangible Assets [Line Items]
Amortizable intangibles	55,115	59,575
Intangible assets, accumulated amortization	114,909	111,060
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Amortizable intangibles	101,071	103,790
Intangible assets, accumulated amortization	26,751	24,800
Other
Finite-Lived Intangible Assets [Line Items]
Amortizable intangibles	9,457	11,316
Intangible assets, accumulated amortization	7,225	5,366
Exchange and clearing organization membership interests and registrations
Finite-Lived Intangible Assets [Line Items]
Indefinite lived intangibles	$ 8,069	$ 8,273