Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	May 31, 2023
Accounting Policies [Abstract]
Reclassification, Comparability Adjustment	Reclassifications to Consolidated Financial StatementsWe have made certain reclassifications within our Consolidated Statements of Financial Condition and Consolidated Statements of Earnings in connection with the merger of Jefferies Group into Jefferies Financial Group Inc. This streamlines our financial statements and better aligns the presentation of our firm with our strategy of building our investment banking and capital markets and asset management businesses and reducing our legacy merchant banking portfolio. The reclassifications including, but not limited to, the presentation of equity method earnings and interest expense within the financial statements, conform to the presentation utilized in the historical Jefferies Group consolidated financial statements prior to the merger. Additionally, the presentation of asset management fees and revenues and selling, general and other expenses has been disaggregated to provide additional financial statement line item categories on the face of the Consolidated Statements of Earnings. These reclassifications have no effect on our consolidated net earnings, comprehensive income, total assets, total liabilities or total equity. These reclassifications have no effect on the net change in cash, cash equivalents and restricted cash. Historical periods have been recast to conform to these reclassifications.
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and should be read in conjunction with our consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended November 30, 2022. Certain footnote disclosures included in our Annual Report on Form 10-K for the year ended November 30, 2022 have been condensed or omitted from the consolidated financial statements as they are not required for interim reporting under U.S. GAAP. The consolidated financial statements reflect all adjustments of a normal, recurring nature that are, in the opinion of management, necessary for the fair presentation of the results for the interim period. The results presented in our consolidated financial statements for interim periods are not necessarily indicative of the results for the entire year. We have made a number of estimates and assumptions relating to the reporting of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses during the reporting period to prepare these consolidated financial statements in conformity with U.S. GAAP. The most important of these estimates and assumptions relate to fair value measurements, compensation and benefits, goodwill and intangible assets and the accounting for income taxes. Although these and other estimates and assumptions are based on the best available information, actual results could be materially different from these estimates.
Consolidation	Consolidation Our policy is to consolidate all entities that we control by ownership of a majority of the outstanding voting stock. In addition, we consolidate entities that meet the definition of a variable interest entity (“VIE”) for which we are the primary beneficiary. The primary beneficiary is the party who has the power to direct the activities of a VIE that most significantly impact the entity’s economic performance and who has an obligation to absorb losses of the entity or a right to receive benefits from the entity that could potentially be significant to the entity. For consolidated entities that are less than wholly-owned, the third-party’s holding of equity interest is presented as Noncontrolling interests in our Consolidated Statements of Financial Condition and Consolidated Statements of Changes in Equity. The portion of net earnings attributable to the noncontrolling interests is presented as Net earnings (losses) attributable to noncontrolling interests in our Consolidated Statements of Earnings. In situations in which we have significant influence, but not control, of an entity that does not qualify as a VIE, we apply either the equity method of accounting or fair value accounting pursuant to the fair value option election under U.S. GAAP, with our portion of net earnings or gains and losses recorded in Other revenues or Principal transactions revenues, respectively. We also have formed nonconsolidated investment vehicles with third-party investors that are typically organized as partnerships or limited liability companies and are carried at fair value. We act as general partner or managing member for these investment vehicles and have generally provided the third-party investors with termination or “kick-out” rights. Intercompany accounts and transactions are eliminated in consolidation.