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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2018
Entity Registrant Name dei_EntityRegistrantName TORRAY FUND
Entity Central Index Key dei_EntityCentralIndexKey 0000862696
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Apr. 30, 2019
Document Effective Date dei_DocumentEffectiveDate Apr. 30, 2019
Prospectus Date rr_ProspectusDate Apr. 30, 2019
Entity Inv Company Type dei_EntityInvCompanyType N-1A
THE TORRAY FUND  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading THE TORRAY FUND
Objective [Heading] rr_ObjectiveHeading Investment Objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Torray Fund’s (the “Fund”) investment objectives are to build investor wealth over extended periods and to minimize shareholder capital gains tax liability by limiting the realization of long- and short-term gains.
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 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 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 4/30/2020
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction 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 or in the example, affect the Fund’s performance.  During the most recent fiscal year, the Fund’s portfolio turnover rate was 4.18% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 4.18%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Fund Operating Expenses do not correlate to the Ratio of Expenses to Average Net Assets included in the “Financial Highlights” section of the Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as acquired fund fees and expenses (“AFFE”).
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.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Approach
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund views common stock ownership as an investment in a business, and therefore invests for the long term, employing a value-oriented approach to security selection.  The Fund invests principally in common stock of large-capitalization companies that generally have demonstrated records of profitability, conservative financial structures, and shareholder-oriented management.   The Fund seeks to invest in such companies when it believes that valuations are modest relative to earnings, cash flow or asset values.  Large capitalization companies are those with market capitalizations of $8 billion or more.   Investments are held as long as the issuers’ fundamentals remain intact, and the Fund believes issuers’ shares are reasonably valued.

Ordinarily, 90% or more of the Fund’s assets will be invested in common stocks to the extent the Fund can identify common stocks which satisfy its selection criteria, with the balance held in U.S. Treasury securities or other cash equivalents.  Although the number of holdings may vary, the Fund usually holds between 25 and 40 stocks, with positions in individual issuers generally ranging between 2% and 4% of the Fund’s assets.   Generally, positions in individual issuers will not exceed 5% of Fund assets.  The Fund will not invest in excess of 25% of its assets in any one industry and generally does not invest greater than 25% of its assets in any specific group of industries.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
General Risk. All investments are subject to risks, and an investment in the Fund is no exception.  Accordingly, you may lose money by investing in the Fund and investors face the risk that the Manager’s business analyses prove faulty.

Market Risk.  The value of the Fund’s investments will fluctuate as markets fluctuate and could decline over short- or long-term periods.

Sector Risk.  The securities of companies in the same or related businesses (“industry sectors”), if comprising a significant portion of the Fund’s portfolio, may in some circumstances react negatively to market conditions, interest rates and economic, regulatory or financial developments and adversely affect the value of the portfolio to a greater extent than if such securities comprised a lesser portion of the Fund’s portfolio or the Fund’s portfolio was diversified across a greater number of industry sectors.  Some industry sectors have particular risks that may not affect other sectors.

No Guarantee.  An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney Accordingly, you may lose money by investing in the Fund and investors face the risk that the Manager’s business analyses prove faulty.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
Below is a bar chart and performance table that provides some indication of the risks of investing in the Fund. The bar chart illustrates how the Fund’s annual total returns have varied from year to year. The performance table provides the Fund’s average annual total returns both on a before-tax and an after-tax basis and compares the Fund’s performance against the performance of an unmanaged market index. It is important to remember that the Fund’s past performance (both before and after taxes) does not indicate how the Fund will perform in the future.  Updated performance information may be obtained on the Fund’s website (https://funds.torray.com/fund-performance/).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns Below is a bar chart and performance table that provides some indication of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress https://funds.torray.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture It is important to remember that the Fund’s past performance (both before and after taxes) does not indicate how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns (%) as of 12/31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the period covered by this bar chart, the Fund’s highest return for a calendar quarter was 15.78% in the third quarter of 2009, and the lowest return for a calendar quarter was -12.04% in the third quarter of 2009.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.78%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (12.04%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(For the periods ended December 31, 2018 )
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historically 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 the investor’s tax situation and may differ from those shown. The 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 Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. The 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 TORRAY FUND | S&P 500 Stock Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P 500 Stock Index *  (reflects no deduction for fees, expenses, or taxes) [1]
1 Year rr_AverageAnnualReturnYear01 (4.38%) [1]
5 Years rr_AverageAnnualReturnYear05 8.49% [1]
10 Years rr_AverageAnnualReturnYear10 13.12% [1]
Since Inception rr_AverageAnnualReturnSinceInception 9.76% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 1990
THE TORRAY FUND | Russell 1000 Value Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 1000 Value Index* (reflects no deduction for fees, expenses, or taxes) [1]
1 Year rr_AverageAnnualReturnYear01 (8.27%) [1]
5 Years rr_AverageAnnualReturnYear05 5.95% [1]
10 Years rr_AverageAnnualReturnYear10 11.18% [1]
Since Inception rr_AverageAnnualReturnSinceInception 9.95% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 1990
THE TORRAY FUND | TORRAY FUND  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol TORYX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.16%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [2]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.17%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.08% [2],[3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 110
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 363
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 635
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,412
Annual Return 2009 rr_AnnualReturn2009 24.80%
Annual Return 2010 rr_AnnualReturn2010 10.90%
Annual Return 2011 rr_AnnualReturn2011 6.01%
Annual Return 2012 rr_AnnualReturn2012 8.38%
Annual Return 2013 rr_AnnualReturn2013 32.84%
Annual Return 2014 rr_AnnualReturn2014 12.04%
Annual Return 2015 rr_AnnualReturn2015 (1.36%)
Annual Return 2016 rr_AnnualReturn2016 14.29%
Annual Return 2017 rr_AnnualReturn2017 12.07%
Annual Return 2018 rr_AnnualReturn2018 (10.60%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (10.60%)
5 Years rr_AverageAnnualReturnYear05 4.82%
10 Years rr_AverageAnnualReturnYear10 10.33%
Since Inception rr_AverageAnnualReturnSinceInception 9.34%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 1990
THE TORRAY FUND | TORRAY FUND | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (11.03%)
5 Years rr_AverageAnnualReturnYear05 3.68%
10 Years rr_AverageAnnualReturnYear10 9.64%
Since Inception rr_AverageAnnualReturnSinceInception 8.47%
THE TORRAY FUND | TORRAY FUND | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares 
1 Year rr_AverageAnnualReturnYear01 (5.92%)
5 Years rr_AverageAnnualReturnYear05 3.75%
10 Years rr_AverageAnnualReturnYear10 8.55%
Since Inception rr_AverageAnnualReturnSinceInception 8.06%
[1] The S&P 500 Stock Index measures the performance of 500 large-capitalization U.S. companies. The Russell 1000 Value Index measures the performance of the large-cap value segment of the U.S. equity universe. It includes those Russell 1000 companies with lower price-to-book ratios and lower excepted and historical growth rates. These indexes are unmanaged and do not reflect the fees and expenses typically incurred by mutual funds. Results include reinvested dividends.
[2] Total Annual Fund Operating Expenses do not correlate to the Ratio of Expenses to Average Net Assets included in the “Financial Highlights” section of the Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as acquired fund fees and expenses (“AFFE”).
[3] Torray LLC (the “Manager”) has contractually agreed prospectively pursuant to an Operating Expense Limitation Agreement (the “Agreement”) to waive its management fee and reimburse the Fund for its current Operating Expenses so as to limit the Fund’s current Operating Expenses to an annual rate, expressed as a percentage of the Fund’s average annual net assets, to 1.00% (the “Expense Cap”). For purposes of the Agreement, the term “Operating Expenses” includes the Manager’s management fee and all other expenses necessary or appropriate for the operation of the Fund, excluding any front-end or contingent deferred loads, taxes, leverage, interest, brokerage commissions, AFFE, trustee fees and expenses, auditor fees and expenses, legal fees and expenses, insurance costs, registration and filing fees, printing, postage and mailing expenses, expenses incurred in connection with any merger or reorganization, or extraordinary expenses such as litigation. The Agreement will remain in effect until April 30, 2020. The Expense Cap may only be raised or eliminated with the consent of the Board of Trustees.