Variable Interest Entities - Assets and Liabilities of Consolidated VIEs Prior to Consolidation (Details) - USD ($) $ in Thousands	Feb. 28, 2022	Nov. 30, 2021
Variable Interest Entity [Line Items]
Assets	$ 55,899,398	$ 54,768,900
Liabilities	48,132,387	47,690,292
VIEs, primary beneficiary | Cash
Variable Interest Entity [Line Items]
VIE assets, eliminated in consolidation	18,000
VIEs, primary beneficiary | Receivable from brokers
Variable Interest Entity [Line Items]
VIE assets, eliminated in consolidation	1,400	1,200
VIEs, primary beneficiary | Other assets
Variable Interest Entity [Line Items]
VIE assets, eliminated in consolidation	45,700
VIEs, primary beneficiary | Other secured financings
Variable Interest Entity [Line Items]
VIE liabilities, eliminated in consolidation	58,600	36,700
VIEs, primary beneficiary | Other liabilities
Variable Interest Entity [Line Items]
VIE liabilities, eliminated in consolidation	75,200	75,300
Secured Funding Vehicles | VIEs, primary beneficiary
Variable Interest Entity [Line Items]
Assets	3,682,500	3,874,600
Liabilities	3,662,400	3,874,600
Secured Funding Vehicles | VIEs, primary beneficiary | Cash
Variable Interest Entity [Line Items]
Assets	11,600	3,800
Secured Funding Vehicles | VIEs, primary beneficiary | Financial instruments owned
Variable Interest Entity [Line Items]
Assets	239,500	173,100
Secured Funding Vehicles | VIEs, primary beneficiary | Securities purchased under agreement to resell
Variable Interest Entity [Line Items]
Assets	2,554,800	3,697,100
Secured Funding Vehicles | VIEs, primary beneficiary | Receivable from brokers
Variable Interest Entity [Line Items]
Assets	0	0
Secured Funding Vehicles | VIEs, primary beneficiary | Other receivables
Variable Interest Entity [Line Items]
Assets	742,900	600
Secured Funding Vehicles | VIEs, primary beneficiary | Other assets
Variable Interest Entity [Line Items]
Assets	133,700	0
Secured Funding Vehicles | VIEs, primary beneficiary | Financial instruments sold, not yet purchased
Variable Interest Entity [Line Items]
Liabilities	0	0
Secured Funding Vehicles | VIEs, primary beneficiary | Other secured financings
Variable Interest Entity [Line Items]
Liabilities	3,609,500	3,828,600
Secured Funding Vehicles | VIEs, primary beneficiary | Repurchase agreements
Variable Interest Entity [Line Items]
Liabilities	0	0
Secured Funding Vehicles | VIEs, primary beneficiary | Payables to broker dealers
Variable Interest Entity [Line Items]
Liabilities	50,100	44,200
Secured Funding Vehicles | VIEs, primary beneficiary | Other liabilities
Variable Interest Entity [Line Items]
Liabilities	2,800	1,800
Other | VIEs, primary beneficiary
Variable Interest Entity [Line Items]
Assets	136,700	187,000
Liabilities	140,400	184,400
Other | VIEs, primary beneficiary | Cash
Variable Interest Entity [Line Items]
Assets	0	0
Other | VIEs, primary beneficiary | Financial instruments owned
Variable Interest Entity [Line Items]
Assets	64,700	146,400
Other | VIEs, primary beneficiary | Securities purchased under agreement to resell
Variable Interest Entity [Line Items]
Assets	18,000	0
Other | VIEs, primary beneficiary | Receivable from brokers
Variable Interest Entity [Line Items]
Assets	54,000	40,600
Other | VIEs, primary beneficiary | Other receivables
Variable Interest Entity [Line Items]
Assets	0	0
Other | VIEs, primary beneficiary | Other assets
Variable Interest Entity [Line Items]
Assets	0	0
Other | VIEs, primary beneficiary | Financial instruments sold, not yet purchased
Variable Interest Entity [Line Items]
Liabilities	18,000	109,100
Other | VIEs, primary beneficiary | Other secured financings
Variable Interest Entity [Line Items]
Liabilities	0	0
Other | VIEs, primary beneficiary | Repurchase agreements
Variable Interest Entity [Line Items]
Liabilities	47,100	0
Other | VIEs, primary beneficiary | Payables to broker dealers
Variable Interest Entity [Line Items]
Liabilities	0	0
Other | VIEs, primary beneficiary | Other liabilities
Variable Interest Entity [Line Items]
Liabilities	$ 75,300	$ 75,300