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SEQUOIA FUND INC  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SEQUOIA FUND, INC.
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund’s investment objective is long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment) The Fund does not impose any sales charges, exchange fees or redemption fees.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 16% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 16.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund’s investment objective is long-term growth of capital. In pursuing this objective, the Fund focuses on investing in equity securities that it believes are undervalued at the time of purchase and have the potential for growth. A guiding principle is the consideration of equity securities, such as common stock, as units of ownership of a business and the purchase of them when the price appears low in relation to the value of the total enterprise.
No weight is given to technical stock market studies. The balance sheet and earnings history and prospects of each company are extensively studied to appraise fundamental intrinsic value. The Fund normally invests in equity securities of U.S. and non-U.S. companies. The Fund may invest in securities of issuers with any market capitalization. The Fund may sell the security of an issuer for a variety of reasons, including when the issuer shows deteriorating fundamentals, its earnings progress falls short of the Adviser’s expectations or its valuation appears excessive relative to its expected future earnings.
Ordinarily, the Fund’s portfolio is invested in equity securities of U.S. and non-U.S. companies. The Fund is not required, however, to be fully invested in equity securities and, in fact, usually maintains a portion of its total assets in cash or securities generally considered to be cash equivalents, including, but not limited to, short-term U.S. Government securities. Depending upon market conditions, cash reserves may be a significant percentage of the Fund’s net assets. The Fund is classified as non-diversified.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Bar Chart and Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and the table shown below provide an indication of the historical risk of an investment in the Fund by showing changes in the Fund’s performance from year-to-year over a 10-year period and by showing how the Fund’s average annual returns for one, five, and ten years compare to the Standard & Poor’s 500 Index (“S&P 500 Index”), a broad-based securities market index. The Fund’s past performance, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and the table shown below provide an indication of the historical risk of an investment in the Fund by showing changes in the Fund’s performance from year-to-year over a 10-year period and by showing how the Fund’s average annual returns for one, five, and ten years compare to the Standard & Poor’s 500 Index (“S&P 500 Index”), a broad-based securities market index.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, of course, does not necessarily indicate how it will perform in the future.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the period shown in the bar chart, the highest return for a quarter was 27.21% (2nd quarter 2020) and the lowest return for a quarter was -22.17% (1st quarter 2020).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return for a quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.21%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return for a quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.17%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2022)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are estimates, which are calculated using the highest historical individual federal marginal income tax rates, and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an individual investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In some instances, the “Return After Taxes on Distributions and Sale of Fund Shares” may be greater than “Return Before Taxes” because the investor is assumed to be able to use the capital loss of the sale of Fund shares to offset other taxable gains.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are estimates, which are calculated using the highest historical individual federal marginal income tax rates, and do not reflect the impact of state and local taxes. In some instances, the “Return After Taxes on Distributions and Sale of Fund Shares” may be greater than “Return Before Taxes” because the investor is assumed to be able to use the capital loss of the sale of Fund shares to offset other taxable gains. Actual after-tax returns depend on an individual investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
SEQUOIA FUND INC | Risk Not Insured [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
SEQUOIA FUND INC | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock You may lose money by investing in the Fund.
SEQUOIA FUND INC | Risk Nondiversified Status [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Non-Diversification Risk.   The Fund is “non-diversified,” meaning that it invests its assets in a smaller number of companies than many other funds. As a result, your investment in the Fund has the risk that changes in the value of a single security may have a significant effect, either negative or positive, on the Fund’s net asset value per share (“NAV”).
SEQUOIA FUND INC | Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Market Risk.   This is the risk that the market values of the Fund’s investments will decline, perhaps sharply and unpredictably, or fail to rise, for various reasons including changes or potential or perceived changes in U.S. or foreign economies, financial markets, interest rates, the liquidity of investments and other factors including terrorism, war, natural disasters and public health events and crises, including disease/virus outbreaks, epidemics and pandemics. The resulting short-term and long-term effects and consequences of such events and factors on global and local economies and specific countries, regions, businesses, industries and companies cannot necessarily be foreseen or predicted. You may lose money by investing in the Fund.
SEQUOIA FUND INC | Value Investing Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Value Investing Risk.   Investing in undervalued securities involves the risk that such securities may never reach their expected market value, either because the market fails to recognize a security’s intrinsic worth or the expected value was misgauged. Such securities may decline in value even though they are already undervalued.
SEQUOIA FUND INC | Foreign (Non-U.S.) Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Foreign (Non-U.S.) Risk.   This is the risk that the value of the Fund’s investments in securities of foreign issuers will be affected adversely by foreign economic, social and political conditions and developments or by the application of foreign legal, regulatory, accounting and auditing standards or foreign taxation policies or by currency fluctuations and controls. The risks to the Fund and, therefore, to your investment in the Fund, of investing in foreign securities include expropriation, settlement difficulties, market illiquidity and higher transaction costs. The prices of foreign securities may move in a different direction than the prices of U.S. securities. In addition, the prices of foreign securities may be more volatile than the prices of U.S. securities.
SEQUOIA FUND INC | Currency Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Currency Risk.   This refers to the risk that securities that trade or are denominated in currencies other than the U.S. Dollar may be affected by fluctuations in currency exchange rates. An increase in the strength of the U.S. Dollar relative to a foreign currency will generally cause the U.S. Dollar value of an investment denominated in that currency to decline. Currency risk may be hedged or unhedged. Unhedged currency exposure may result in gains or losses as a result of a change in the relationship between the U.S. Dollar and the respective foreign currency.
SEQUOIA FUND INC | Small-Cap and Mid-Cap Company Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Small-Cap and Mid-Cap Company Risk.   Investing in securities of small-cap and mid-cap companies may involve greater risks than investing in securities of larger, more established issuers. Small-cap and mid-cap companies may be engaged in business within a narrow geographic region, be less well-known to the investment community and have more volatile share prices. These companies often lack management depth and have narrower market penetrations, less diverse product lines and fewer resources than larger companies. Moreover, the securities of such companies often have less market liquidity and, as a result, their stock prices often react more strongly to changes in the marketplace.
SEQUOIA FUND INC | Growth Company Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Growth Company Risk.   The prices of growth securities are often highly sensitive to market fluctuations because of their heavy dependence on future earnings or cash flow expectations, and can be more volatile than the market in general.
SEQUOIA FUND INC | Risks of Investing in a Managed Fund [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Risks of Investing in a Managed Fund.   Performance of individual securities can vary widely. The investment decisions of the Adviser may cause the Fund to underperform other investments or benchmark indices. The Fund may also underperform other mutual funds with similar investment strategies. The Adviser may be incorrect in assessing a particular industry or company, including the anticipated earnings growth of the company. The Adviser may not buy securities at the lowest possible prices or sell securities at the highest possible prices. As with any mutual fund investment, there can be no guarantee that the Fund will achieve its investment goals.
SEQUOIA FUND INC | Illiquid Investments Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Illiquid Investments Risk.   When there is no willing buyer and a security cannot be readily sold at the desired time or price, the Fund may need to accept a lower price or may not be able to sell the security at all. An inability to sell securities, at the Fund’s desired price or at all, can adversely affect the Fund’s value or prevent the Fund from being able to take advantage of other investment opportunities.
SEQUOIA FUND INC | S&P 500 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (18.11%)
5 Years rr_AverageAnnualReturnYear05 9.42%
10 Years rr_AverageAnnualReturnYear10 12.56%
SEQUOIA FUND INC | SEQUOIA FUND INC  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.09%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.09% [1]
Expense Reimbursement by the Adviser rr_FeeWaiverOrReimbursementOverAssets (0.09%) [1]
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.00% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 111
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 347
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 601
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,329
Annual Return 2013 rr_AnnualReturn2013 34.58%
Annual Return 2014 rr_AnnualReturn2014 7.56%
Annual Return 2015 rr_AnnualReturn2015 (7.31%)
Annual Return 2016 rr_AnnualReturn2016 (6.90%)
Annual Return 2017 rr_AnnualReturn2017 20.07%
Annual Return 2018 rr_AnnualReturn2018 (2.62%)
Annual Return 2019 rr_AnnualReturn2019 29.12%
Annual Return 2020 rr_AnnualReturn2020 23.33%
Annual Return 2021 rr_AnnualReturn2021 25.48%
Annual Return 2022 rr_AnnualReturn2022 (30.52%)
1 Year rr_AverageAnnualReturnYear01 (30.52%)
5 Years rr_AverageAnnualReturnYear05 6.22%
10 Years rr_AverageAnnualReturnYear10 7.33%
SEQUOIA FUND INC | SEQUOIA FUND INC | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (31.01%)
5 Years rr_AverageAnnualReturnYear05 3.31%
10 Years rr_AverageAnnualReturnYear10 4.88%
SEQUOIA FUND INC | SEQUOIA FUND INC | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (17.71%)
5 Years rr_AverageAnnualReturnYear05 4.85%
10 Years rr_AverageAnnualReturnYear10 5.66%
[1] It is the intention of Ruane, Cunniff  & Goldfarb L.P. (the “Adviser”) to ensure the Fund does not pay in excess of 1.00% in Net Annual Fund Operating Expenses. This expense reimbursement obligation is a provision of the Adviser’s investment advisory contract with the Fund and the reimbursement obligation will be in effect only so long as that investment advisory contract is in effect.