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SIT MUTUAL FUNDS INC | Sit Global Dividend Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY INFORMATION SIT GLOBAL DIVIDEND GROWTH FUND
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Sit Global Dividend Growth Fund (the “Fund”) seeks to provide current income that exceeds the dividend yield of the Fund’s benchmark index and that grows over a period of years.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock Secondarily the Fund seeks 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, 2023
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 11.55% (both classes) of the average value of the portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 11.55%
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. 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 objectives by investing, under normal market conditions, at least 80% of its net assets in dividend-paying common stocks issued by U.S. and foreign companies. The Fund may invest the balance of its assets in preferred stocks, convertible bonds, U.S. Treasury securities, and
closed-end
investment companies.
The Fund’s diversified portfolio is designed to have lower volatility than that of the MSCI World Index, but with a higher yield and greater prospects for dividend growth.
The Adviser invests in dividend paying growth-oriented companies it believes exhibit the potential for growth and growing dividend payments. The Adviser believes that a company’s earnings growth is a primary determinant of its potential long-term return, and that a record of increasing dividend payments is a strong indicator of financial health and growth prospects. By investing in dividend paying stocks it is anticipated that the holdings will tend to be in large to
medium-sized
companies (companies with market capitalization in excess of $2 billion).
The Adviser considers several factors in its evaluation of a company’s potential for above average long-term earnings, revenue, and dividend growth, including:
 
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a record of paying dividends,
 
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strong prospects for growing dividend payments indicated in part by growing earnings and cash flow,
 
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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.
Since stocks that pay dividends tend to be less volatile and may not experience the same capital appreciation as stocks that don’t pay dividends, the Fund’s diversified portfolio of dividend paying stocks is expected to have lower volatility than that of the MSCI World Index, but with a higher dividend yield and greater prospects for dividend growth.
The Fund diversifies its investments among a number of different countries throughout the world. Under normal circumstances, the Fund will invest at least 40% of its net assets in stocks of foreign companies drawn from at least three different countries (and at least 30% of its net assets in stocks of foreign companies if market conditions are deemed unfavorable).
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 the company’s fundamentals, anticipated earnings, anticipated dividend payments and financial position.
Risk [Heading] rr_RiskHeading PRINCIPAL INVESTMENT RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
You could lose money by investing in the Fund. The principal risks of investing in the Fund are listed below. Different risks may be more significant at different times, depending on market conditions or other factors.
 
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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.
The public health crisis caused by the novel coronavirus disease known as
COVID-19
has severely impacted business activity in virtually all economies, markets, and sectors and negatively impacted the value of many financial and other assets. The
COVID-19
outbreak has resulted in numerous disruptions, including travel and border restrictions, quarantines, supply chain disruptions, lower consumer demand and general market uncertainty. These events could have a significant impact on the Fund’s performance, as well as the performance and viability of issuers in which it invests. Although vaccines for
COVID-19
are becoming more widely available, the full extent and duration of the
COVID-19
outbreak and its effects cannot be determined with certainty. Similar consequences could arise as a result of the spread of other infectious diseases.
 
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Dividend Paying Company Risk: The Fund’s income objective may limit its ability to appreciate during a broad market advance because dividend paying stocks may not experience the same capital appreciation as
non-dividend
paying stocks. In addition, stocks held by the Fund may reduce or stop paying dividends which could affect the Fund’s ability to generate income.
 
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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.
 
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Mid Cap Stock Risk: Stocks of mid cap stocks may be subject to more abrupt or erratic market movement than stocks of larger, more established companies.
 
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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.
 
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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.
 
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Management Risk: A strategy used by the investment management team may not produce the intended results.
 
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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.
 
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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.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the Fund.
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 for Class I shares.
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.
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 for Class I shares.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 9/30/21 (not annualized) was 11.56%
Best Quarter: 19.08% (2Q20); Worst Quarter:
-19.26%
(1Q20)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for periods ended December 31, 2020
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.
SIT MUTUAL FUNDS INC | Sit Global Dividend 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
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.25%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.25%) [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.00% [1]
1 Year rr_ExpenseExampleYear01 $ 1,020
3 Years rr_ExpenseExampleYear03 3,722
5 Years rr_ExpenseExampleYear05 6,635
10 Years rr_ExpenseExampleYear10 $ 14,947
2011 rr_AnnualReturn2011 (2.58%)
2012 rr_AnnualReturn2012 13.61%
2013 rr_AnnualReturn2013 21.70%
2014 rr_AnnualReturn2014 4.03%
2015 rr_AnnualReturn2015 (0.93%)
2016 rr_AnnualReturn2016 4.96%
2017 rr_AnnualReturn2017 19.75%
2018 rr_AnnualReturn2018 (9.63%)
2019 rr_AnnualReturn2019 26.70%
2020 rr_AnnualReturn2020 16.00%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 11.56%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.08%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.26%)
1 Year rr_AverageAnnualReturnYear01 16.00%
5 Years rr_AverageAnnualReturnYear05 10.79%
10 Years rr_AverageAnnualReturnYear10 8.77%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2008
SIT MUTUAL FUNDS INC | Sit Global Dividend 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%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.50%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.25%) [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.25% [1]
1 Year rr_ExpenseExampleYear01 $ 127
3 Years rr_ExpenseExampleYear03 450
5 Years rr_ExpenseExampleYear05 796
10 Years rr_ExpenseExampleYear10 $ 1,775
1 Year rr_AverageAnnualReturnYear01 15.77%
5 Years rr_AverageAnnualReturnYear05 10.53%
10 Years rr_AverageAnnualReturnYear10 8.50%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2008
SIT MUTUAL FUNDS INC | Sit Global Dividend Growth Fund | Return after taxes on distributions | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.67%
5 Years rr_AverageAnnualReturnYear05 10.35%
10 Years rr_AverageAnnualReturnYear10 7.88%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2008
SIT MUTUAL FUNDS INC | Sit Global Dividend Growth Fund | Return after taxes on distributions and sale of Fund shares | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.64%
5 Years rr_AverageAnnualReturnYear05 8.49%
10 Years rr_AverageAnnualReturnYear10 6.92%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2008
SIT MUTUAL FUNDS INC | Sit Global Dividend Growth Fund | MSCI World Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.90%
5 Years rr_AverageAnnualReturnYear05 12.19%
10 Years rr_AverageAnnualReturnYear10 9.87%
[1] Sit Investment Associates, Inc. (the “Adviser”) has agreed to reduce the management fee to 1.00% through June 30, 2023. The Adviser may elect to extend, modify or terminate the fee waiver at that time.