Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	RS INVESTMENT TRUST
Prospectus Date	rr_ProspectusDate	May 01, 2013
RS Money Market Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	RS Money Market Fund The Board of Trustees of RS Investment Trust (the “Trust”) has approved the liquidation of the Fund. Shares of the Fund are no longer offered, except for sales to existing shareholders and certain intermediaries. It is expected that the Fund will cease operations on or around May 17, 2013 and that the Fund will make a liquidating distribution in cash on or shortly thereafter.
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	To seek as high a level of current income as is consistent with liquidity and preservation of capital.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.
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 are deducted from Fund assets as a percentage of average daily net assets)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	April 30, 2014
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 costs of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated. This Example also assumes that your investment earns a 5% return each year and that the Fund’s operating expenses remain the same as shown above. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	Assuming Redemption at End of  Period
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	Assuming No Redemption
Strategy [Heading]	rr_StrategyHeading	Investments, Risks, and Performance Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund’s investment team normally invests the Fund’s assets in U.S. dollar-denominated, high-quality, short-term instruments. In buying and selling investments for the Fund, the Fund’s investment team intends to comply with Rule 2a-7 under the Investment Company Act of 1940, which sets forth the requirements for money market funds regarding credit quality, diversification, maturity and liquidity. The Fund normally invests in money market instruments, which are high-quality, short term instruments that pay a fixed, variable, or floating interest rate. Money market instruments may include, for example, bank certificates of deposit and other bank obligations, notes, commercial paper, U.S. Government securities, and repurchase agreements. The Fund’s investment team generally considers securities to be high-quality if they are rated at the time of investment in the highest short-term rating by at least two nationally recognized statistical ratings organizations or, where only one ratings organization has assigned a rating to the securities, the securities were assigned the highest rating by such ratings organization. The Fund’s investment team seeks to cause the Fund to have a dollar-weighted average portfolio maturity of 60 days or less. The Securities and Exchange Commission and other regulatory bodies are considering rules that may have the effect of changing significantly the structure of money market funds. It is not possible at this time to predict whether such rules will be adopted or the effects they would have on money market funds generally or on the Fund in particular.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You may lose money by investing in the Fund. The Fund may not achieve its investment objective. The return on money market instruments is typically lower than the return on stocks or bonds. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. Money Market Securities Risk The value of the securities held by the Fund changes in response to changes in interest rates and depends on the issuer’s credit quality. Income received by the Fund may decrease as a result of a decline in interest rates. When interest rates are very low the Fund’s expenses could absorb all or a significant portion of the Fund’s income. If interest rates increase, the Fund’s yield may not increase proportionately.
Risk Lose Money [Text]	rr_RiskLoseMoney	You may lose money by investing in the Fund.
Risk Money Market Fund [Text]	rr_RiskMoneyMarketFund	Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Fund Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns for 1, 5, and 10 years and since inception compare with those of a broad measure of market performance. The returns in the bar chart do not reflect the impact of sales loads. If they did, the returns would be lower than those shown. The Fund’s past performance (before and after taxes) is not an indication of future performance. Updated performance information for the Fund is available at www.rsinvestments.com or by calling 800-766-3863.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns for 1, 5, and 10 years and since inception compare with those of a broad measure of market performance.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	800-766-3863
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.rsinvestments.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading]	rr_BarChartHeading	Annual Total Return for Class A Shares (calendar year-end)
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The returns in the bar chart do not reflect the impact of sales loads. If they did, the returns would be lower than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter    Third Quarter 2007  1.13%            Worst Quarter  Fourth Quarter 2012  0.00%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns (periods ended 12/31/12)
RS Money Market Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of sale proceeds or the original offering price)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.12%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.82%	[2]
Fee Waiver/Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.07%)	[2]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement	rr_NetExpensesOverAssets	0.75%	[2]
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Contingent deferred sales load of 1.00% applies to purchases of $1 million or more of Class A shares if these shares are sold within 18 months of purchase.
1 Year	rr_ExpenseExampleYear01	77
3 Years	rr_ExpenseExampleYear03	255
5 Years	rr_ExpenseExampleYear05	448
10 Years	rr_ExpenseExampleYear10	1,007
1 Year	rr_ExpenseExampleNoRedemptionYear01	77
3 Years	rr_ExpenseExampleNoRedemptionYear03	255
5 Years	rr_ExpenseExampleNoRedemptionYear05	448
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,007
2003	rr_AnnualReturn2003	0.37%
2004	rr_AnnualReturn2004	0.57%
2005	rr_AnnualReturn2005	2.41%
2006	rr_AnnualReturn2006	4.26%
2007	rr_AnnualReturn2007	4.45%
2008	rr_AnnualReturn2008	1.82%
2009	rr_AnnualReturn2009	0.05%
2010	rr_AnnualReturn2010	0.02%
2011	rr_AnnualReturn2011	0.02%
2012	rr_AnnualReturn2012	0.01%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2007
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	1.13%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2012
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	0.00%
1 Year	rr_AverageAnnualReturnYear01	0.01%
5 Years	rr_AverageAnnualReturnYear05	0.38%
10 Years	rr_AverageAnnualReturnYear10	1.38%
Since Inception	rr_AverageAnnualReturnSinceInception	4.12%
Inception Date of Share Class	rr_AverageAnnualReturnInceptionDate	Sep. 13, 1982
RS Money Market Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of sale proceeds or the original offering price)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[3]
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses	rr_OtherExpensesOverAssets	0.07%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.52%	[2]
Fee Waiver/Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[2]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement	rr_NetExpensesOverAssets	1.50%	[2]
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Contingent deferred sales load applies for shares sold within one year of purchase.
1 Year	rr_ExpenseExampleYear01	253
3 Years	rr_ExpenseExampleYear03	478
5 Years	rr_ExpenseExampleYear05	827
10 Years	rr_ExpenseExampleYear10	1,811
1 Year	rr_ExpenseExampleNoRedemptionYear01	153
3 Years	rr_ExpenseExampleNoRedemptionYear03	478
5 Years	rr_ExpenseExampleNoRedemptionYear05	827
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,811
1 Year	rr_AverageAnnualReturnYear01	(0.99%)
5 Years	rr_AverageAnnualReturnYear05	0.24%
10 Years	rr_AverageAnnualReturnYear10	1.08%
Since Inception	rr_AverageAnnualReturnSinceInception	1.25%
Inception Date of Share Class	rr_AverageAnnualReturnInceptionDate	Aug. 07, 2000
RS Money Market Fund | Class K
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of sale proceeds or the original offering price)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.65%
Other Expenses	rr_OtherExpensesOverAssets	0.22%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.32%	[2]
Fee Waiver/Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.17%)	[2]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement	rr_NetExpensesOverAssets	1.15%	[2]
1 Year	rr_ExpenseExampleYear01	117
3 Years	rr_ExpenseExampleYear03	402
5 Years	rr_ExpenseExampleYear05	707
10 Years	rr_ExpenseExampleYear10	1,575
1 Year	rr_ExpenseExampleNoRedemptionYear01	117
3 Years	rr_ExpenseExampleNoRedemptionYear03	402
5 Years	rr_ExpenseExampleNoRedemptionYear05	707
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,575
1 Year	rr_AverageAnnualReturnYear01	0.01%
5 Years	rr_AverageAnnualReturnYear05	0.30%
10 Years	rr_AverageAnnualReturnYear10	1.19%
Since Inception	rr_AverageAnnualReturnSinceInception	1.18%
Inception Date of Share Class	rr_AverageAnnualReturnInceptionDate	May 15, 2001
RS Money Market Fund | Barclays U.S. Treasury Bellwethers (3 Month) Index (reflects no deduction for fees, expenses or taxes) | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.12%
5 Years	rr_AverageAnnualReturnYear05	0.57%
10 Years	rr_AverageAnnualReturnYear10	1.82%
Since Inception	rr_AverageAnnualReturnSinceInception	4.61%	[4]
Inception Date of Share Class	rr_AverageAnnualReturnInceptionDate	Aug. 31, 1982
RS Money Market Fund | Barclays U.S. Treasury Bellwethers (3 Month) Index (reflects no deduction for fees, expenses or taxes) | Class C
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.12%
5 Years	rr_AverageAnnualReturnYear05	0.57%
10 Years	rr_AverageAnnualReturnYear10	1.82%
Since Inception	rr_AverageAnnualReturnSinceInception	2.18%
Inception Date of Share Class	rr_AverageAnnualReturnInceptionDate	Aug. 07, 2000
RS Money Market Fund | Barclays U.S. Treasury Bellwethers (3 Month) Index (reflects no deduction for fees, expenses or taxes) | Class K
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.12%
5 Years	rr_AverageAnnualReturnYear05	0.57%
10 Years	rr_AverageAnnualReturnYear10	1.82%
Since Inception	rr_AverageAnnualReturnSinceInception	1.91%
Inception Date of Share Class	rr_AverageAnnualReturnInceptionDate	May 15, 2001

[1] Contingent deferred sales load of 1.00% applies to purchases of $1 million or more of Class A shares if these shares are sold within 18 months of purchase.

[2] RS Investments has contractually agreed to limit the Total Annual Fund Operating Expenses (excluding expenses indirectly incurred by the Fund through investments in pooled investment vehicles, interest, taxes, investment-related expenses (e.g., brokerage commissions), and extraordinary expenses) to 0.75% for Class A shares, 1.50% for Class C shares, and 1.15% for Class K shares. This expense limitation will continue through April 30, 2014 and cannot be terminated by RS Investments prior to that date without the action or consent of the Fund's Board of Trustees.

[3] Contingent deferred sales load applies for shares sold within one year of purchase.

[4] Since inception return for the Barclays U.S. Treasury Bellwethers (3 Month) Index shown in the table is since August 31, 1982, the month end prior to the inception of Class A shares.