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SIT MUTUAL FUNDS INC | Sit ESG Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY INFORMATION SIT ESG GROWTH FUND
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Sit ESG Growth Fund (the “Fund”) seeks to maximize long-term capital appreciation.
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 tables or the examples below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination June 30, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transactions 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 in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 7.12% of the average value of the portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 7.12%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The total annual fund operating expenses do not correlate to the ratio of expenses to average net assets shown in the Fund’s Financial Highlights, which does not include Acquired Fund Fees and Expenses.
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. It assumes that you invest $100,000 in Class I shares of the Fund and $10,000 in Class S shares of the Fund for the time periods indicated, that your investment has a 5% return each year, that the Fund’s operating expenses remain the same, and that you redeem all of your shares at the end of those periods. The Example reflects the current fee waivers in effect for the 1 Year period. Although your actual costs and returns 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 seeks to achieve its objective by investing, under normal market conditions, at least 80% of its net assets in companies that the Adviser believes have strong environmental, social and corporate governance (ESG) practices at the time of purchase.
The Adviser invests in growth-oriented companies it believes exhibit the potential for superior growth. The Fund focuses on stocks issued by companies with long records of earnings and revenue growth. The Adviser believes that a company’s earnings growth is the primary determinant of its potential long-term return, and evaluates a company’s potential for above average long-term earnings and revenue growth. Several factors are considered in the Adviser’s evaluation of a company, including:
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unique product or service,
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growing product demand,
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dominant and growing market share,
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management experience and capabilities, and
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strong financial condition.
In addition to the fundamental financial analysis, the stock selection process takes into consideration ESG screens from third-party providers that rank companies within an industry or sector based on several ESG characteristics, or the Adviser’s own analysis of a company’s ESG practices if such ranking is not available or the Adviser believes the available ranking is not accurate. The ESG screens utilize comparative weighted rankings of company ESG issues by sectors based on company and industry-specific factors, which assess a company’s sustainability policies, management systems and performance. Generally, the Adviser deems a company to have strong ESG practices when its industry ranking is in the top 50th percentile. ESG factors often require a subjective analysis and are subject to change. Environmental factors may include, for example, environmental footprint, pollution impact, and resource management. Social factors may include, for example, human capital concerns, product safety, workplace diversity and employee welfare. Governance factors may include, for example, corporate governance concerns, business ethics, sustainability policy and public policy concerns.
The Fund invests in the common stock of U.S. and foreign companies, and in American Depository Receipts and Global Depository Receipts of foreign companies. The Fund invests primarily in companies of large to medium capitalizations (companies with market capitalizations in excess of $2 billion).
The Fund may invest in open‑end investment companies (mutual funds) and closed‑end investment companies which invest in the same types of securities in which the Fund may invest directly.
When selling equity securities for the Fund, the Adviser considers several factors, including changes in a company’s fundamentals, anticipated earnings, financial position and ESG practices or ranking.
The Fund’s benchmark index to be used in connection with the Fund’s investment objective is the MSCI World Index, and such benchmark index may be changed from time to time with approval of the Fund’s Board of Directors. The MSCI World Index represents large and mid‑cap equity performance of 23 developed markets countries.
Risk [Heading] rr_RiskHeading PRINCIPAL INVESTMENT RISKS
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading HISTORICAL PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following bar chart and table provide information on the Fund’s volatility and performance. The Fund’s past performance before and after taxes is not necessarily an indication of how the Fund will perform in the future. The bar chart below is intended to provide you with an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year.
The table below compares the Fund’s performance over different time periods to that of the Fund’s benchmark index, which is a broad measure of market performance. The table includes returns both before and after taxes. After‑tax returns are calculated using historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after‑tax returns depend on an 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. After‑tax returns are shown only for Class I shares; after‑tax returns for Class S shares will vary.
The performance information reflects Fund expenses, and assumes that all distributions have been reinvested. Performance reflects fee waivers in effect. If these fee waivers were not in place, performance would be reduced. The benchmark is an unmanaged index, has no expenses, and it is not possible to invest directly in an index. Updated performance information is available at the Fund’s website at www.sitfunds.com or by calling 800‑332‑5580.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart below is intended to provide you with an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year.The table below compares the Fund’s performance over different time periods to that of the Fund’s benchmark index, which is a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800‑332‑5580
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.sitfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance before and after taxes is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns for calendar years ended December 31 (Class I)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
The Fund’s year‑to‑date return as of 9/30/23 (not annualized) was 12.78%.
Best Quarter: 18.99% (2Q20)
Worst Quarter: ‑17.97% (1Q20)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for periods ended December 31, 2022
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After‑tax returns are calculated using historical highest 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 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 One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After‑tax returns are shown only for Class I shares; after‑tax returns for Class S shares will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Returns after taxes on distributions and sale of Fund shares are higher than before‑tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares.
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock You could lose money by investing in the Fund.
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Market Risk: The market value of securities may fall, sometimes rapidly and unpredictably. These declines may be due to factors affecting a particular issuer, or the result of, among other things, political, regulatory, market, economic or social developments affecting the markets(s) generally. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund and its investments and potentially increase the risks described herein.
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | ESG Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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ESG Risk: The Fund’s ESG criteria may exclude securities of certain issuers for nonfinancial reasons and therefore the Fund may forgo some market opportunities available to funds that don’t use an ESG criteria. Stocks of companies with ESG practices may shift into and out of favor with stock market investors depending on market and economic conditions, and the Fund’s performance may at times be better or worse than the performance of funds that do not use an ESG criteria. Investors may differ in their views of ESG characteristics. As a result, the Fund may invest in companies that do not reflect the beliefs and values of any particular investor.
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | Mid Cap Stock Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Mid Cap Stock Risk: Stocks of mid cap companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies.
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | Growth Style Investing Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Growth Style Investing Risk: Different types of stocks tend to shift into and out of favor with stock market investors depending on market and economic conditions. The Fund invests in growth style stocks. The Fund’s performance may at times be better or worse than the performance of funds that focus on other types of stocks or that have a broader investment style.
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | Sector Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Sector Risk: To the extent the Fund invests a significant portion of its assets in the securities of companies in the same sector of the market or region, an adverse economic, business or political development affecting that sector or region may affect the value of the Fund’s investments more, and the Fund’s investments may be more volatile, than if its investments were not so concentrated in such economic sector or geographic region.
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | International Investing Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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International Investing Risk: Because the Fund may invest in foreign securities, there is an international investing risk. International investing involves risks not typically associated with investing in U.S. securities which may adversely affect the Fund’s investment. These risks include currency risk, foreign securities market risk, foreign tax risk, information risk, investment restriction risk, and political and economic risks.
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | Investment Company Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Investment Company Risk: To the extent that the Fund invests in shares of another investment company, it will indirectly absorb its pro rata share of such investment company’s operation expenses, including investment advisory and administrative fees, which will reduce the Fund’s return on such investment relative to investment alternatives that do not include such expenses. In addition, the ability of the Fund to achieve its investment objective will partially depend upon the ability of the acquired fund to achieve its investment objective.
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | Management Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Management Risk: A strategy used by the investment management team may not produce the intended results.
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | Cybersecurity Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
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Cybersecurity Risk: Cybersecurity breaches may allow an unauthorized party to gain access to Fund assets, shareholder data, or proprietary information, or cause the Fund and/or its service providers to suffer data corruption or lose operational functionality. The issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value of these securities could decline if the issuers experience cyber attacks or other cybersecurity breaches.
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of amount redeemed only on shares held for less than 30 days) rr_RedemptionFeeOverRedemption 2.00%
Management Fees rr_ManagementFeesOverAssets 1.25%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.26% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.25%) [2]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.01%
1 Year rr_ExpenseExampleYear01 $ 1,035
3 Years rr_ExpenseExampleYear03 3,770
5 Years rr_ExpenseExampleYear05 6,712
10 Years rr_ExpenseExampleYear10 $ 15,076
2016 rr_AnnualReturn2016 3.56%
2017 rr_AnnualReturn2017 23.72%
2018 rr_AnnualReturn2018 (7.36%)
2019 rr_AnnualReturn2019 26.41%
2020 rr_AnnualReturn2020 15.90%
2021 rr_AnnualReturn2021 19.95%
2022 rr_AnnualReturn2022 (21.00%)
Year to Date Return, Label rr_YearToDateReturnLabel year‑to‑date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2023
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 12.78%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.99%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.97%)
1 Year rr_AverageAnnualReturnYear01 (21.00%)
5 Years rr_AverageAnnualReturnYear05 5.16%
Life of Fund rr_AverageAnnualReturnSinceInception 7.73% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2016
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | Class S  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of amount redeemed only on shares held for less than 30 days) rr_RedemptionFeeOverRedemption 2.00%
Management Fees rr_ManagementFeesOverAssets 1.25%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.51% [1]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.25%) [2]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.26%
1 Year rr_ExpenseExampleYear01 $ 129
3 Years rr_ExpenseExampleYear03 456
5 Years rr_ExpenseExampleYear05 805
10 Years rr_ExpenseExampleYear10 $ 1,790
1 Year rr_AverageAnnualReturnYear01 (21.24%)
5 Years rr_AverageAnnualReturnYear05 4.87%
Life of Fund rr_AverageAnnualReturnSinceInception 7.45% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2016
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | Return after taxes on distributions | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (21.60%)
5 Years rr_AverageAnnualReturnYear05 4.76%
Life of Fund rr_AverageAnnualReturnSinceInception 7.37% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2016
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | Return after taxes on distributions and sale of Fund shares | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (12.00%) [4]
5 Years rr_AverageAnnualReturnYear05 4.02% [4]
Life of Fund rr_AverageAnnualReturnSinceInception 6.14% [3],[4]
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2016 [4]
SIT MUTUAL FUNDS INC | Sit ESG Growth Fund | MSCI World Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (18.14%)
5 Years rr_AverageAnnualReturnYear05 6.14%
Life of Fund rr_AverageAnnualReturnSinceInception 9.09% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2016
[1]
The total annual fund operating expenses do not correlate to the ratio of expenses to average net assets shown in the Fund’s Financial Highlights, which does not include Acquired Fund Fees and Expenses. Acquired Fund Fees and Expenses represent fees and expenses incurred indirectly by the Fund as a result of its investment in shares of investment companies.
[2]
Sit Investment Associates, Inc. (the “Adviser”) has agreed to management fee waivers for Class I and Class S shares equal to 0.25% through June 30, 2025. Until such date, the waivers cannot be terminated without approval by the Fund’s Board of Directors. After June 30, 2025, the Adviser may elect to extend, modify or terminate the fee waivers.
[3]
The Fund commenced investment operations on June 30, 2016.
[4]
Returns after taxes on distributions and sale of Fund shares are higher than before‑tax returns for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of Fund shares.