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SIT LARGE CAP GROWTH FUND INC | SIT LARGE CAP GROWTH FUND INC  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY INFORMATION SIT LARGE CAP GROWTH FUND
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Sit Large Cap 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)
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 9.75% of the average value of the portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 9.75%
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 $10,000 in 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 objective by investing, under normal market conditions, at least 80% of its net assets in the common stocks of companies with capitalizations of $5 billion or more at the time of purchase.
Sit Investment Associates, Inc. (the “Adviser”) invests in domestic 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.
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 and anticipated earnings.
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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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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Large Cap Stock Risk: Stocks of large cap companies as a group could fall out of favor with the market, causing the Fund to underperform investments that focus solely on small- or medium- capitalization stocks.
 
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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.
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.
The performance information reflects Fund expenses, and assumes that all distributions have been reinvested. 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
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
The Fund’s
year-to-date
return as of 9/30/21 (not annualized) was 16.41%.
Best Quarter: 27.91% (2Q20)
Worst Quarter:
-14.81%
(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.
SIT LARGE CAP GROWTH FUND INC | SIT LARGE CAP GROWTH FUND INC | SIT LARGE CAP GROWTH FUND INC  
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 1.00%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.00%
1 Year rr_ExpenseExampleYear01 $ 102
3 Years rr_ExpenseExampleYear03 319
5 Years rr_ExpenseExampleYear05 553
10 Years rr_ExpenseExampleYear10 $ 1,229
2011 rr_AnnualReturn2011 (0.53%)
2012 rr_AnnualReturn2012 13.96%
2013 rr_AnnualReturn2013 29.21%
2014 rr_AnnualReturn2014 10.97%
2015 rr_AnnualReturn2015 4.47%
2016 rr_AnnualReturn2016 4.36%
2017 rr_AnnualReturn2017 27.83%
2018 rr_AnnualReturn2018 (3.11%)
2019 rr_AnnualReturn2019 32.81%
2020 rr_AnnualReturn2020 33.94%
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 16.41%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.91%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (14.81%)
1 Year rr_AverageAnnualReturnYear01 33.94%
5 Years rr_AverageAnnualReturnYear05 18.12%
10 Years rr_AverageAnnualReturnYear10 14.59%
SIT LARGE CAP GROWTH FUND INC | SIT LARGE CAP GROWTH FUND INC | Return after taxes on distributions | SIT LARGE CAP GROWTH FUND INC  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 32.31%
5 Years rr_AverageAnnualReturnYear05 15.92%
10 Years rr_AverageAnnualReturnYear10 11.89%
SIT LARGE CAP GROWTH FUND INC | SIT LARGE CAP GROWTH FUND INC | Return after taxes on distributions and sale of Fund shares | SIT LARGE CAP GROWTH FUND INC  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 21.23%
5 Years rr_AverageAnnualReturnYear05 14.06%
10 Years rr_AverageAnnualReturnYear10 11.24%
SIT LARGE CAP GROWTH FUND INC | SIT LARGE CAP GROWTH FUND INC | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 38.49%
5 Years rr_AverageAnnualReturnYear05 21.00%
10 Years rr_AverageAnnualReturnYear10 17.21%