v3.25.1
Performance Management - SEQUOIA FUND INC
Apr. 25, 2025
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Bar Chart and Performance Information
Performance Narrative [Text Block]
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 Past Does Not Indicate Future [Text] 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] 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.
Bar Chart [Table]
[MISSING IMAGE: bc_sequoie-4c.jpg]
Bar Chart Closing [Text Block]
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 [Optional Text] highest return for a quarter
Highest Quarterly Return 27.21%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] lowest return for a quarter
Lowest Quarterly Return (22.17%)
Lowest Quarterly Return, Date Mar. 31, 2020
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2024)
Performance Table Uses Highest Federal Rate 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 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 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]
​ ​ ​ ​
1 Year
​ ​
5 Years
​ ​
10 Years
​
​ Sequoia Fund ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​
Return Before Taxes
​ ​ ​ ​ 20.79% ​ ​ ​ ​ ​ 10.67% ​ ​ ​ ​ ​ 8.02% ​ ​
​
Return After Taxes on Distributions
​ ​ ​ ​ 19.43% ​ ​ ​ ​ ​ 8.89% ​ ​ ​ ​ ​ 5.53% ​ ​
​
Return After Taxes on Distributions and Sale of Fund Shares
​ ​ ​ ​ 13.28% ​ ​ ​ ​ ​ 8.24% ​ ​ ​ ​ ​ 5.69% ​ ​
​ S&P 500 Index ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​
(reflects no deduction for fees, expenses or taxes)
​ ​ ​ ​ 25.02% ​ ​ ​ ​ ​ 14.51% ​ ​ ​ ​ ​ 13.09% ​ ​
​
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]
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.