Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2022
Cash flows from operating activities:
Net earnings	$ 716,019	$ 262,388	$ 781,710
Adjustments to reconcile net earnings to net cash (used in) provided by operating activities:
Depreciation and amortization	197,850	113,473	189,343
Deferred income taxes	(4,131)	10,462	(70,396)
Share-based compensation	63,119	45,360	43,919
Net bad debt expense	52,451	67,009	46,846
(Income) losses on investments in and loans to related parties	(86,466)	192,197	36,287
Distributions received on investments in related parties	60,039	58,336	82,161
Gain on sale of subsidiaries and investments in related parties	(59,105)	0	(319,041)
Other adjustments	264,680	(99,784)	(601,303)
Net change in assets and liabilities:
Securities deposited with clearing and depository organizations	0	(110,198)	0
Receivables:
Brokers, dealers and clearing organizations	(287,820)	(436,029)	631,672
Customers	(790,292)	(480,487)	384,097
Fees, interest and other	(69,280)	(103,870)	200,672
Securities borrowed	(23,601)	(1,307,125)	548,567
Financial instruments owned	(2,416,306)	(2,843,554)	(773,523)
Securities purchased under agreements to resell	(237,567)	(1,263,278)	3,047,353
Other assets	(339,141)	(551,926)	(230,722)
Payables:
Brokers, dealers and clearing organizations	(48,889)	1,054,135	(1,288,912)
Customers	113,418	83,181	(882,576)
Securities loaned	702,646	431,423	(139,557)
Financial instruments sold, not yet purchased	(234,747)	(8,894)	1,875,957
Securities sold under agreements to repurchase	1,427,068	3,324,482	(952,584)
Lease liabilities	(65,417)	(52,129)	(89,689)
Accrued expenses and other liabilities	925,006	(318,798)	(715,434)
Net cash (used in) provided by operating activities from continuing operations	(140,466)	(1,933,626)	1,804,847
Net cash (used in) provided by operating activities from discontinued operations	(68,789)	0	0
Cash flows from investing activities:
Contributions to investments in and loans to related parties	(1,080,358)	(251,751)	(351,645)
Capital distributions from investments and repayments of loans from related parties	936,684	116,750	286,578
Originations and purchases of automobile loans, notes and other receivables	(89,540)	(441,583)	(527,929)
Principal collections of automobile loans, notes and other receivables	83,268	350,348	434,487
Net payments on premises and equipment	(250,584)	(1,155)	(224,301)
Proceeds from sales of subsidiaries and investments in related parties, net of expenses and cash of operations sold	610,843	0	333,149
Net cash acquired in business acquisitions	0	215,187	0
Proceeds for the sale from investments	0	0	3,588
Deconsolidation of asset management entity	0	0	(23,107)
Other	0	0	8,641
Net cash provided by (used in) investing activities from continuing operations	210,313	(12,204)	(60,539)
Cash flows from financing activities:
Proceeds from short-term borrowings	6,219,084	5,413,000	3,659,098
Payments on short-term borrowings	(6,743,153)	(5,010,868)	(3,338,000)
Proceeds from issuance of long-term debt, net of issuance costs	5,952,286	2,209,672	1,198,565
Repayment of long-term debt	(2,427,653)	(1,282,369)	(824,894)
Proceeds from conversion of common to preferred shares	9,844	31,500	0
Purchase of common shares for treasury	(44,312)	(169,402)	(859,593)
Dividends paid to common and preferred shareholders	(302,964)	(278,595)	(280,104)
Net proceeds from (payments on) other secured financings	877,962	89,073	(2,448,731)
Net change in bank overdrafts	(23,933)	52,054	(14,569)
Proceeds from contributions of noncontrolling interests	10,039	0	64,880
Payments on distributions to noncontrolling interests	(13,407)	0	(2,629)
Other	6,104	6,059	2,752
Net cash provided by (used in) financing activities from continuing operations	3,519,897	1,060,124	(2,843,225)
Net cash (used in) provided by financing activities from discontinued operations	(170,631)	0	0
Supplemental Cash Flow Elements [Abstract]
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(2,246)	54,911	(22,143)
Change in cash, cash equivalents, and restricted cash reclassified from (to) assets held for sale	(13,224)	(45,691)	0
Net increase (decrease) in cash, cash equivalents, and restricted cash	3,348,078	(830,795)	(1,121,060)
Cash, cash equivalents, and restricted cash at beginning of period	9,830,758	10,707,244	11,828,304
Cash and cash equivalents at end of period	13,165,612	9,830,758	10,707,244
Cash paid during the period for:
Interest	3,440,878	2,348,061	1,164,093
Income taxes, net	257,503	159,359	214,066
Non-cash investing activities	$ 600	30,600
Transfer from investments			$ 215,900
Conversion of preferred shares to common shares		125,000
Shareholders
Cash paid during the period for:
Dividend distributions		527,000
Noncontrolling Interest Holders
Cash paid during the period for:
Dividend distributions		$ 31,400