Variable Interest Entities - Assets and Liabilities of Consolidated VIEs Prior to Consolidation (Details) - USD ($) $ in Thousands	Nov. 30, 2023	Nov. 30, 2022
Variable Interest Entity [Line Items]
Financial instruments owned	$ 21,747,473	$ 18,666,296
Securities Borrowed	5,950,549	4,546,691
Brokers, dealers and clearing organizations	2,380,732	1,792,937
Assets held for sale	1,545,472	0
Other assets	2,650,640	3,595,985
Total assets	57,905,161	51,057,683
Financial instruments sold, not yet purchased, at fair value	11,251,154	11,056,477
Other secured financings (includes $3,898 and $1,712 at fair value)	1,430,199	2,037,843
Liabilities held for sale	1,173,648	0
Long-term debt (includes $1,708,443 and $1,583,828 at fair value)	9,698,752	8,774,086
Total liabilities	48,102,620	40,630,743
Variable interest entities
Variable Interest Entity [Line Items]
Assets held for sale	181,900
Other assets	244,604	1,032,353
Variable interest entities | Securitization activity
Variable Interest Entity [Line Items]
Cash	0	0
Financial instruments owned	0	0
Securities Borrowed	1,677,700	1,565,000
Brokers, dealers and clearing organizations	0	0
Assets held for sale	815,600	0
Other assets	0	798,800
Total assets	2,493,300	2,363,800
Financial instruments sold, not yet purchased, at fair value	0	0
Other secured financings (includes $3,898 and $1,712 at fair value)	1,667,300	2,289,900
Other Liabilities	10,500	4,600
Liabilities held for sale	769,200	0
Long-term debt (includes $1,708,443 and $1,583,828 at fair value)	0	0
Total liabilities	2,447,000	2,294,500
Variable interest entities | Other
Variable Interest Entity [Line Items]
Cash	1,100	1,400
Financial instruments owned	7,800	7,100
Securities Borrowed	0	0
Brokers, dealers and clearing organizations	18,000	15,200
Assets held for sale	578,800	0
Other assets	147,900	88,300
Total assets	753,600	112,000
Financial instruments sold, not yet purchased, at fair value	6,400	5,700
Other secured financings (includes $3,898 and $1,712 at fair value)	0	0
Other Liabilities	249,700	37,600
Liabilities held for sale	303,400	0
Long-term debt (includes $1,708,443 and $1,583,828 at fair value)	49,600	24,700
Total liabilities	609,100	68,000
Variable Interest Entity, Assets, Eliminated In Consolidation
Variable Interest Entity [Line Items]
Assets held for sale	31,900
Other assets	56,100	82,400
Variable Interest Entity, Liabilities, Eliminated In Consolidation
Variable Interest Entity [Line Items]
Other secured financings (includes $3,898 and $1,712 at fair value)	681,000	253,800
Other Liabilities	247,900	$ 30,900
Liabilities held for sale	5,300
Consolidation, Eliminations
Variable Interest Entity [Line Items]
Brokers, dealers and clearing organizations	$ 1,400