Variable Interest Entities - Assets and Liabilities of Consolidated VIEs Prior to Consolidation (Details) - USD ($) $ in Thousands	Aug. 31, 2022	Nov. 30, 2021
Variable Interest Entity [Line Items]
Assets	$ 51,182,848	$ 54,768,900
Liabilities	43,325,251	47,690,292
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	68,800
VIEs, primary beneficiary | Other secured financings
Variable Interest Entity [Line Items]
VIE liabilities, eliminated in consolidation	251,200	36,700
VIEs, primary beneficiary | Other liabilities
Variable Interest Entity [Line Items]
VIE liabilities, eliminated in consolidation	60,800	75,300
Secured Funding Vehicles | VIEs, primary beneficiary
Variable Interest Entity [Line Items]
Assets	2,459,600	3,874,600
Liabilities	2,406,600	3,874,600
Secured Funding Vehicles | VIEs, primary beneficiary | Cash
Variable Interest Entity [Line Items]
Assets	0	3,800
Secured Funding Vehicles | VIEs, primary beneficiary | Financial instruments owned
Variable Interest Entity [Line Items]
Assets	0	173,100
Secured Funding Vehicles | VIEs, primary beneficiary | Securities purchased under agreement to resell
Variable Interest Entity [Line Items]
Assets	1,575,800	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	753,200	600
Secured Funding Vehicles | VIEs, primary beneficiary | Other assets
Variable Interest Entity [Line Items]
Assets	130,600	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	2,403,400	3,828,600
Secured Funding Vehicles | VIEs, primary beneficiary | Payables to broker dealers
Variable Interest Entity [Line Items]
Liabilities	0	44,200
Secured Funding Vehicles | VIEs, primary beneficiary | Other liabilities
Variable Interest Entity [Line Items]
Liabilities	3,200	1,800
Other | VIEs, primary beneficiary
Variable Interest Entity [Line Items]
Assets	62,200	187,000
Liabilities	65,400	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	35,100	146,400
Other | VIEs, primary beneficiary | Securities purchased under agreement to resell
Variable Interest Entity [Line Items]
Assets	0	0
Other | VIEs, primary beneficiary | Receivable from brokers
Variable Interest Entity [Line Items]
Assets	26,800	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	300	0
Other | VIEs, primary beneficiary | Financial instruments sold, not yet purchased
Variable Interest Entity [Line Items]
Liabilities	3,700	109,100
Other | VIEs, primary beneficiary | Other secured financings
Variable Interest Entity [Line Items]
Liabilities	0	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	$ 61,700	$ 75,300