Related Party Transactions - Jefferies (Details) - USD ($)		1 Months Ended	3 Months Ended		12 Months Ended
	Nov. 27, 2019	Jun. 30, 2020	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019	Nov. 03, 2020
Related Party Transaction [Line Items]
Payables to brokers, dealers and clearing organizations			$ 5,814,066,000	$ 3,325,753,000	$ 5,814,066,000	$ 3,325,753,000
Financial instruments owned, at fair value			19,336,237,000	17,686,052,000	19,336,237,000	17,686,052,000
Disposal group, disposed of by sale, not discontinued operations | Sale of subsidiary
Related Party Transaction [Line Items]
Sale of subsidiary								$ 180,700,000
Jefferies | Broker-dealer payable to customer
Related Party Transaction [Line Items]
Customer accounts payables			500,000	2,200,000	500,000	2,200,000
Affiliated entity | Director
Related Party Transaction [Line Items]
Investment in related party				800,000		800,000
Affiliated entity | Jefferies
Related Party Transaction [Line Items]
Charges to Jefferies for services provided					42,900,000	47,200,000	$ 52,700,000
Charges from Jefferies for services received					38,400,000	32,200,000	9,500,000
Receivable from Jefferies			300,000	1,300,000	300,000	1,300,000
Payable to Jefferies			10,900,000	7,100,000	10,900,000	7,100,000
Payments of distributions					923,500,000	498,700,000
Proceeds from contributions					153,600,000
Accrued distributions payable					193,000,000	153,600,000
Tax receivable			130,600,000		130,600,000
Tax payable				111,100,000		111,100,000
Payment made to related party related to tax sharing agreement					595,000,000	83,000,000
Net gain on investments					0
Securities purchased from Jefferies					17,100,000	64,800,000
Securities sold to Jefferies					5,700,000	100,000
Payment received for transferred investment	$ 31,000,000
Increase (decrease) due from affiliates		$ 2,900,000
Affiliated entity | Jefferies | Corporate debt securities
Related Party Transaction [Line Items]
Financial instruments owned, at fair value			2,300,000	2,600,000	2,300,000	2,600,000
Reversal of floor brokerage clearance fees					1,000,000
Affiliated entity | Jefferies | Investment banking
Related Party Transaction [Line Items]
Charges to Jefferies for services provided					45,800,000	10,500,000	10,600,000
Affiliated entity | Jefferies | Commissions and other fees
Related Party Transaction [Line Items]
Charges to Jefferies for services provided					900,000	1,500,000	1,200,000
Affiliated entity | Affiliate of Jefferies
Related Party Transaction [Line Items]
Payables to brokers, dealers and clearing organizations			700,000	2,700,000	700,000	2,700,000
Financial instruments owned, at fair value			100,000		100,000
Payments for rent and other expenses					800,000	800,000	0
Affiliated entity | Subsidiary of Jefferies
Related Party Transaction [Line Items]
Net gains (losses) on foreign exchange contracts			$ (100,000)	(1,600,000)	6,100,000
Affiliated entity | Hedge fund managed by Jefferies
Related Party Transaction [Line Items]
Net gain on investments						15,800,000	4,700,000
Investment in related party				$ 239,000,000		$ 239,000,000
Payment received					$ 2,200,000
Affiliated entity | Hedge fund managed by Jefferies | Director
Related Party Transaction [Line Items]
Investment in related party							$ 400,000