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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName JPMorgan Trust I
Prospectus Date rr_ProspectusDate Mar. 01, 2015
Institutional Shares | JPMorgan Intrepid International Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading JPMorgan Intrepid International Fund

Class/Ticker: Institutional/JFTIX
Objective [Heading] rr_ObjectiveHeading What is the goal of the Fund?
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to maximize long-term capital growth by investing primarily in equity securities in developed markets outside the U.S.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. “Acquired Fund Fees and Expenses” are expenses incurred indirectly by the Fund through its ownership of shares in other investment companies, including affiliated money market funds, other mutual funds, exchange-traded funds and business development companies. The impact of Acquired Fund Fees and Expenses is included in the total returns of the Fund. Acquired Fund Fees and Expenses are not direct costs of the Fund, are not used to calculate the Fund’s net asset value per share and are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund’s prospectus.
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 2/29/16
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 Fund’s most recent fiscal year, the Fund’s portfolio turnover rate was 48% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 48.00%rr_PortfolioTurnoverRate
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Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent As of March 1, 2015, the Fund’s advisory fee was reduced; therefore, the Management Fees and Total Annual Fund Operating Expenses have been restated to reflect the current fees.

“Remainder of Other Expenses” have been calculated based on the actual other expenses incurred in the most recent fiscal year, except that these expenses have been adjusted to reflect a reallocation of sub-transfer agency expenses among the classes as if they has been in effect during the most recent fiscal year.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Acquired Fund Fees and Expenses are not direct costs of the Fund, are not used to calculate the Fund’s net asset value per share and are not included in the calculation of the ratio of expenses to average net assets shown in the Financial Highlights section of the Fund’s prospectus.
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. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses are equal to the total annual fund operating expenses after fee waivers and expense reimbursements shown in the table through 2/29/16 and total annual fund operating expenses thereafter. Your actual costs may be higher or lower.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption WHETHER OR NOT YOU SELL YOUR SHARES, YOUR
COST WOULD BE:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption WHETHER OR NOT YOU SELL YOUR SHARES, YOUR
COST WOULD BE:
Strategy [Heading] rr_StrategyHeading What are the Fund’s main investment strategies?
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund’s assets are invested primarily in equity securities of companies from developed countries other than the U.S. The Fund’s assets also may be invested, to a limited extent, in equity securities of companies from emerging markets. Developed countries include Australia, Canada, Japan, New Zealand, the United Kingdom and most of the countries of Western Europe and Hong Kong; emerging markets include most of the other countries in the world.

The equity securities in which the Fund may invest include, but are not limited to, common stock, preferred stock, convertible securities, trust or partnership interests, depositary receipts and warrants and rights.

The Fund may invest in securities denominated in U.S. dollars, other major reserve currencies, such as the euro, yen and pound sterling, and currencies of other countries in which it can invest.

The Fund will invest in securities across all market capitalizations, although the Fund may invest a significant portion of its assets in companies of any one particular market capitalization category.

The Fund may utilize currency forwards to manage currency exposure of its foreign investments relative to its benchmark. The Fund may also use exchange-traded futures for the efficient management of cash flows.

Investment Process: In managing the Fund, the adviser adheres to a disciplined process for security selection and portfolio construction. A proprietary multifactor model is used to quantitatively rank securities in the Fund’s investment universe on the basis of value and growth factors. Value is measured by valuation multiples, while momentum is captured by factors such as relative price strength and earnings revisions. Securities held in the Fund that the adviser believes have become over-valued and/or whose growth signals have deteriorated materially may be sold. Securities that are sold are generally replaced with the most attractive securities, on the basis of the adviser’s disciplined investment process.

The portfolio construction process controls for sector and industry weights, number of securities held, and position size. Risk or factor exposures are actively managed through portfolio construction.
Risk [Heading] rr_RiskHeading The Fund’s Main Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock The Fund is subject to management risk and may not achieve its objective if the adviser’s expectations regarding particular securities or markets are not met.

An investment in this Fund or any other fund may not provide a complete investment program. The suitability of an investment in the Fund should be considered based on the investment objective, strategies and risks described in this prospectus, considered in light of all of the other investments in your portfolio, as well as your risk tolerance, financial goals and time horizons. You may want to consult with a financial advisor to determine if this Fund is suitable for you.


Equity Market Risk. The price of equity securities may rise or fall because of changes in the broad market or changes in a company’s financial condition, sometimes rapidly or unpredictably. These price movements may result from factors affecting individual companies, sectors or industries selected for the Fund’s portfolio or the securities market as a whole, such as changes in economic or political conditions. When the value of the Fund’s securities goes down, your investment in the Fund decreases in value.

General Market Risk. Economies and financial markets throughout the world are becoming increasingly interconnected, which increases the likelihood that events or conditions in one country or region will adversely impact markets or issuers in other countries or regions.

Foreign Securities and Emerging Market Risk. Investments in foreign issuers and foreign securities (including depositary receipts) are subject to additional risks, including political and economic risks, civil conflicts and war, greater volatility, Expropriation and nationalization risks, sanctions or other measures by the United States or other governments, currency fluctuations, higher transaction costs, delayed settlement, possible foreign controls on investment, and less stringent investor protection and disclosure standards of foreign markets. In certain markets where securities and other instruments are not traded “delivery versus payment,” the Fund may not receive timely payment for securities or other instruments it has delivered or receive delivery of securities paid for and may be subject to increased risk that the counterparty will fail to make payments or delivery when due or default completely. Events and evolving conditions in certain economies or markets may alter the risks associated with investments tied to countries or regions that historically were perceived as comparatively stable becoming riskier and more volatile. These risks are magnified in “emerging markets.” Emerging market countries typically have less-established market economies than developed countries and may face greater social, economic, regulatory and political uncertainties.

Derivatives Risk. Derivatives, including forward currency contracts and futures, may be riskier than other types of investments because they may be more sensitive to changes in economic or market conditions than other types of investments and could result in losses that significantly exceed the Fund’s original investment. Many derivatives create leverage thereby causing the Fund to be more volatile than it would be if it had not used derivatives. Derivatives also expose the Fund to counterparty risk (the risk that the derivative counterparty will not fulfill its contractual obligations), including credit risk of the derivative counterparty. Certain derivatives are synthetic instruments that attempt to replicate the performance of certain reference assets. With regard to such derivatives, the Fund does not have a claim on the reference assets and is subject to enhanced counterparty risk.

Currency Risk. Changes in foreign currency exchange rates will affect the value of the Fund’s securities and the price of the Fund’s shares. Generally, when the value of the U.S. dollar rises in value relative to a foreign currency, an investment in that country loses value because that currency is worth fewer U.S. dollars. Devaluation of a currency by a country’s government or banking authority also will have a significant impact on the value of any investments denominated in that currency. Currency markets generally are not as regulated as securities markets.

Redemption Risk. The Fund could experience a loss when selling securities to meet redemption requests by shareholders. The risk of loss increases if the redemption requests are unusually large or frequent or occur in times of overall market turmoil or declining prices.

Investments in the Fund are not deposits or obligations of, or guaranteed or endorsed by, any bank and are not insured or guaranteed by the FDIC, the Federal Reserve Board or any other government agency.

You could lose money investing in the Fund.

Risk Lose Money [Text] rr_RiskLoseMoney You could lose money investing in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Investments in the Fund are not deposits or obligations of, or guaranteed or endorsed by, any bank and are not insured or guaranteed by the FDIC, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading The Fund’s Past Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock This section provides some indication of the risks of investing in the Fund. The bar chart shows how the performance of the Fund’s Institutional Class Shares has varied from year to year for the past ten calendar years. The table shows the average annual total returns over the past one year, five years and ten years. The table compares that performance to the Morgan Stanley Capital International (MSCI) Europe, Australasia and Far East (EAFE) Index (net of foreign withholding taxes) and the Lipper International Multi-Cap Core Funds Index , an index based on the total returns of certain mutual funds within the Fund’s designated category as determined by Lipper. Unlike the other index, the Lipper index includes the expenses of the mutual funds included in the index. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available by visiting www.jpmorganfunds.com or by calling 1-800-480-4111.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart shows how the performance of the Fund’s Institutional Class Shares has varied from year to year for the past ten calendar years. The table shows the average annual total returns over the past one year, five years and ten years.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The table compares that performance to the Morgan Stanley Capital International (MSCI) Europe, Australasia and Far East (EAFE) Index (net of foreign withholding taxes) and the Lipper International Multi-Cap Core Funds Index , an index based on the total returns of certain mutual funds within the Fund’s designated category as determined by Lipper. Unlike the other index, the Lipper index includes the expenses of the mutual funds included in the index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-480-4111
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.jpmorganfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture 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 YEAR-BY-YEAR RETURNS
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter 2nd quarter, 2009     24.67%   
Worst Quarter 3rd quarter, 2011   –22.73%
Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURNS
(For periods ended December 31, 2014)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the 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 the investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns are calculated using the 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 the investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Institutional Shares | JPMorgan Intrepid International Fund | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.60%rr_ManagementFeesOverAssets
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[1]
Distribution (Rule 12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Service Fees rr_Component1OtherExpensesOverAssets 0.10%rr_Component1OtherExpensesOverAssets
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Remainder of Other Expenses rr_Component2OtherExpensesOverAssets 0.13%rr_Component2OtherExpensesOverAssets
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Other Expenses rr_OtherExpensesOverAssets 0.23%rr_OtherExpensesOverAssets
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Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%rr_AcquiredFundFeesAndExpensesOverAssets
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Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.84%rr_ExpensesOverAssets
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[1]
1 Year rr_ExpenseExampleYear01 86rr_ExpenseExampleYear01
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3 Years rr_ExpenseExampleYear03 268rr_ExpenseExampleYear03
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5 Years rr_ExpenseExampleYear05 466rr_ExpenseExampleYear05
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10 Years rr_ExpenseExampleYear10 1,037rr_ExpenseExampleYear10
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1 Year rr_ExpenseExampleNoRedemptionYear01 86rr_ExpenseExampleNoRedemptionYear01
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3 Years rr_ExpenseExampleNoRedemptionYear03 268rr_ExpenseExampleNoRedemptionYear03
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5 Years rr_ExpenseExampleNoRedemptionYear05 466rr_ExpenseExampleNoRedemptionYear05
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10 Years rr_ExpenseExampleNoRedemptionYear10 1,037rr_ExpenseExampleNoRedemptionYear10
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2005 rr_AnnualReturn2005 14.34%rr_AnnualReturn2005
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2006 rr_AnnualReturn2006 26.21%rr_AnnualReturn2006
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2007 rr_AnnualReturn2007 11.00%rr_AnnualReturn2007
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2008 rr_AnnualReturn2008 (45.45%)rr_AnnualReturn2008
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2009 rr_AnnualReturn2009 27.76%rr_AnnualReturn2009
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2010 rr_AnnualReturn2010 12.45%rr_AnnualReturn2010
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2011 rr_AnnualReturn2011 (14.75%)rr_AnnualReturn2011
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2012 rr_AnnualReturn2012 19.88%rr_AnnualReturn2012
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2013 rr_AnnualReturn2013 23.11%rr_AnnualReturn2013
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2014 rr_AnnualReturn2014 (6.03%)rr_AnnualReturn2014
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Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 24.67%rr_BarChartHighestQuarterlyReturn
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Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.73%)rr_BarChartLowestQuarterlyReturn
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Past 1 Year rr_AverageAnnualReturnYear01 (6.03%)rr_AverageAnnualReturnYear01
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Past 5 Years rr_AverageAnnualReturnYear05 5.86%rr_AverageAnnualReturnYear05
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Past 10 Years rr_AverageAnnualReturnYear10 4.03%rr_AverageAnnualReturnYear10
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Institutional Shares | JPMorgan Intrepid International Fund | Return After Taxes on Distributions | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 (6.28%)rr_AverageAnnualReturnYear01
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Past 5 Years rr_AverageAnnualReturnYear05 5.69%rr_AverageAnnualReturnYear05
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Past 10 Years rr_AverageAnnualReturnYear10 3.84%rr_AverageAnnualReturnYear10
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Institutional Shares | JPMorgan Intrepid International Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 (3.04%)rr_AverageAnnualReturnYear01
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Past 5 Years rr_AverageAnnualReturnYear05 4.79%rr_AverageAnnualReturnYear05
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Past 10 Years rr_AverageAnnualReturnYear10 3.49%rr_AverageAnnualReturnYear10
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Institutional Shares | JPMorgan Intrepid International Fund | MSCI EAFE INDEX (Net of Foreign Withholding Taxes) (Reflects No Deduction for Fees, Expenses or Taxes, Except Foreign Withholding Taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 (4.90%)rr_AverageAnnualReturnYear01
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Past 5 Years rr_AverageAnnualReturnYear05 5.33%rr_AverageAnnualReturnYear05
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Past 10 Years rr_AverageAnnualReturnYear10 4.43%rr_AverageAnnualReturnYear10
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Institutional Shares | JPMorgan Intrepid International Fund | LIPPER INTERNATIONAL MULTI-CAP CORE FUNDS INDEX (Reflects No Deduction for Taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 (4.65%)rr_AverageAnnualReturnYear01
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Past 5 Years rr_AverageAnnualReturnYear05 6.32%rr_AverageAnnualReturnYear05
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Past 10 Years rr_AverageAnnualReturnYear10 5.44%rr_AverageAnnualReturnYear10
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[1] As of March 1, 2015, the Fund’s advisory fee was reduced; therefore, the Management Fees and Total Annual Fund Operating Expenses have been restated to reflect the current fees.
[2] “Remainder of Other Expenses” have been calculated based on the actual other expenses incurred in the most recent fiscal year, except that these expenses have been adjusted to reflect a reallocation of sub-transfer agency expenses among the classes as if they has been in effect during the most recent fiscal year.