Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019	Dec. 01, 2020	Dec. 01, 2019
Goodwill [Roll Forward]
Balance, at beginning of period	$ 1,646,933	$ 1,643,599
Currency translation and other adjustments	(1,216)	6,334
Goodwill impairment	(400)	(3,000)	$ 0
Balance, at end of period	1,645,317	1,646,933	$ 1,643,599
Investment Banking and Capital Markets
Goodwill [Roll Forward]
Balance, at beginning of period	1,646,523
Balance, at end of period	1,645,317	1,646,523
Accumulated goodwill impairments				$ 51,900	$ 51,900
Goodwill, gross				1,700,000	1,690,000
Asset Management
Goodwill [Roll Forward]
Balance, at beginning of period	410
Balance, at end of period	$ 0	$ 410
Accumulated goodwill impairments				5,100	2,100
Goodwill, gross				$ 5,500	$ 5,500