Variable Interest Entities - Assets and Liabilities of Consolidated VIEs Prior to Consolidation (Details) - USD ($) $ in Thousands	Nov. 30, 2021	Nov. 30, 2020
Variable Interest Entity [Line Items]
Total assets	$ 54,768,900	$ 47,751,997
Liabilities	47,690,292	41,385,865
Securitization activity | Other assets
Variable Interest Entity [Line Items]
Total assets		0
Other | Other assets
Variable Interest Entity [Line Items]
Total assets	0
Variable interest entity, primary beneficiary | Cash
Variable Interest Entity [Line Items]
VIE assets, eliminated in consolidation		700
Variable interest entity, primary beneficiary | Other receivables
Variable Interest Entity [Line Items]
VIE assets, eliminated in consolidation		1,200
Variable interest entity, primary beneficiary | Other secured financings
Variable Interest Entity [Line Items]
VIE liabilities, eliminated in consolidation	36,700	138,200
Variable interest entity, primary beneficiary | Other liabilities
Variable Interest Entity [Line Items]
VIE liabilities, eliminated in consolidation	75,300	300
Variable interest entity, primary beneficiary | Securitization activity
Variable Interest Entity [Line Items]
Total assets	3,874,600	2,908,900
Liabilities	3,874,600	2,908,900
Variable interest entity, primary beneficiary | Securitization activity | Cash
Variable Interest Entity [Line Items]
Total assets	3,800	0
Variable interest entity, primary beneficiary | Securitization activity | Financial instruments owned
Variable Interest Entity [Line Items]
Total assets	173,100	0
Variable interest entity, primary beneficiary | Securitization activity | Securities purchased under agreements to resell
Variable Interest Entity [Line Items]
Total assets	3,697,100	2,908,900
Variable interest entity, primary beneficiary | Securitization activity | Receivables from brokers
Variable Interest Entity [Line Items]
Total assets	0	0
Variable interest entity, primary beneficiary | Securitization activity | Other receivables
Variable Interest Entity [Line Items]
Total assets	600	0
Variable interest entity, primary beneficiary | Securitization activity | Other assets
Variable Interest Entity [Line Items]
Total assets	0
Variable interest entity, primary beneficiary | Securitization activity | Financial instruments sold, not yet purchased
Variable Interest Entity [Line Items]
Liabilities	0	0
Variable interest entity, primary beneficiary | Securitization activity | Other secured financings
Variable Interest Entity [Line Items]
Liabilities	3,828,600	2,907,800
Variable interest entity, primary beneficiary | Securitization activity | Payables to broker dealers
Variable Interest Entity [Line Items]
Liabilities	44,200	0
Variable interest entity, primary beneficiary | Securitization activity | Other liabilities
Variable Interest Entity [Line Items]
Liabilities	1,800	1,100
Variable interest entity, primary beneficiary | Other
Variable Interest Entity [Line Items]
Total assets	187,000	19,400
Liabilities	184,400	2,900
Variable interest entity, primary beneficiary | Other | Cash
Variable Interest Entity [Line Items]
Total assets	0	1,200
Variable interest entity, primary beneficiary | Other | Financial instruments owned
Variable Interest Entity [Line Items]
Total assets	146,400	5,200
Variable interest entity, primary beneficiary | Other | Securities purchased under agreements to resell
Variable Interest Entity [Line Items]
Total assets	0	0
Variable interest entity, primary beneficiary | Other | Receivables from brokers
Variable Interest Entity [Line Items]
Total assets	40,600	12,900
Variable interest entity, primary beneficiary | Other | Other receivables
Variable Interest Entity [Line Items]
Total assets	0	0
Variable interest entity, primary beneficiary | Other | Other assets
Variable Interest Entity [Line Items]
Total assets		100
Variable interest entity, primary beneficiary | Other | Financial instruments sold, not yet purchased
Variable Interest Entity [Line Items]
Liabilities	109,100	2,500
Variable interest entity, primary beneficiary | Other | Other secured financings
Variable Interest Entity [Line Items]
Liabilities	0	0
Variable interest entity, primary beneficiary | Other | Payables to broker dealers
Variable Interest Entity [Line Items]
Liabilities	0	0
Variable interest entity, primary beneficiary | Other | Other liabilities
Variable Interest Entity [Line Items]
Liabilities	$ 75,300	$ 400