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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName JPMorgan Trust I
Prospectus Date rr_ProspectusDate Mar. 01, 2015
Select Shares | JPMorgan Global Research Enhanced Index Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading JPMorgan Global Research Enhanced Index Fund

Class/Ticker: Select/JEITX
Objective [Heading] rr_ObjectiveHeading What is the goal of the Fund?
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide long-term capital appreciation.
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 40% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 40.00%rr_PortfolioTurnoverRate
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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 Under normal circumstances, the Fund will invest at least 80% of its Assets in securities that are included in the index designated by the Fund or securities whose economic returns are similar to such index or its components. “Assets” means net assets, plus the amount of borrowings for investment purposes. The securities in which the Fund may invest include, but are not limited to, common stock, preferred stock, depositary receipts, privately placed securities and real estate investment trusts (REITs).

The Fund seeks to outperform the Morgan Stanley Capital International (MSCI) World Index1 (net of foreign withholding taxes) (the Index) over time while maintaining similar risk characteristics. In implementing its strategy, the Fund primarily invests in securities included within the universe of the Index. However, the Fund modestly overweights securities in the Index that it considers undervalued while modestly underweighting or not holding securities in the Index that it considers overvalued. Under normal circumstances, while the Fund anticipates that it will only own a portion, which may represent a minority, of the securities included in the Index, it seeks to achieve similar sector, geographic and risk characteristics to the Index. By owning a large number of securities within the Index, with an emphasis on those that appear undervalued, the Fund seeks returns that modestly exceed those of the Index over the long term with a modest level of tracking error to the Index. The Index may include the securities of smaller capitalization companies.

The Fund may invest in securities of issuers located anywhere in the world. Under normal circumstances, the Fund intends to invest at least 40% of its total assets in countries other than the United States, unless the index designated by the Fund includes less than 40% of its total assets in countries other than the United States, in which case, the Fund would invest at least 30% of its total assets in such countries.

The Fund may use exchange-traded futures to gain exposure to particular foreign securities or markets and for the efficient management of cash flows. The Fund may invest in securities denominated in any currency and may from time to time hedge a portion of its foreign currency exposure using currency forwards.

Investment Process: In managing the Fund, the adviser combines fundamental research with a disciplined portfolio construction process. The adviser utilizes proprietary research, optimization modeling techniques and individual security selection in constructing the Fund’s portfolio. In-depth, fundamental research into individual securities is conducted by research analysts who emphasize each issuer’s long-term prospects. This research allows the adviser to rank issuers within each sector group according to their relative value. The adviser will modestly overweight securities which it deems to be attractive and modestly underweight or not hold those securities which it believes are unattractive.

The adviser may sell a security as its valuations or rankings change or if more attractive investments become available.

In managing the Fund, the adviser will seek to help manage risk in the Fund’s portfolio by investing in issuers in at least three different countries other than the United States. However, the Fund may invest a substantial part of its assets in just one country.

1 MSCI World Index is a registered service mark of Morgan Stanley Capital International, which does not sponsor and is in no way affiliated with the Fund.
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 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 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.

Tracking Error Risk. The Fund’s performance will vary from the performance of the Index. The Fund’s strategy of seeking to achieve returns that modestly exceed those of the Index creates a greater chance of tracking error than if the Fund were to follow a more passive indexing strategy designed to replicate the Index. Like other mutual funds, the Fund will also incur fees and transaction costs that will contribute to tracking error. Changes in the composition of the Index or the timing of purchases and redemptions of Fund shares may also contribute to tracking error.

Derivatives Risk. Derivatives, including futures, may be riskier than other types of investments and may increase the volatility of the Fund. Derivatives may be sensitive to changes in economic and market conditions and may create leverage, which could result in losses that significantly exceed the Fund’s original investment. Derivatives expose the Fund to counterparty risk, which is the risk that the derivative counterparty will not fulfill its contractual obligations (and includes credit risk associated with the 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. Derivatives may not perform as expected, so the Fund may not realize the intended benefits. When used for hedging, the change in value of a derivative may not correlate as expected with the security or other risk being hedged. In addition, given their complexity, derivatives expose the Fund to risks of mispricing or improper valuation.

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 may have a significant impact on the value of any investments denominated in that currency. Currency markets generally are not as regulated as securities markets. To the extent that the Fund hedges its currency exposure into the U.S. dollar, it may reduce the effects of currency fluctuations. The Fund may also hedge from one foreign currency to another. However, the Fund does not typically use this strategy for its currency exposure.

Smaller Cap Company Risk. Because the Fund may invest in equity investments of companies across all market capitalizations, the Fund’s risks increase as it invests more heavily in smaller cap companies (mid cap and small cap companies). Smaller companies may be more volatile and vulnerable to economic, market and industry changes. As a result, share price changes may be more sudden or erratic than the prices of other equity securities, especially over the short term.

Real Estate Securities Risk. The Fund’s investments in real estate securities, including REITs, are subject to the same risks as direct investments in real estate and mortgages, and their value will depend on the value of the underlying real estate interests. These risks include default, prepayments, changes in value resulting from changes in interest rates and demand for real and rental property, and the management skill and creditworthiness of REIT issuers. The Fund will indirectly bear its proportionate share of expenses, including management fees, paid by each REIT in which it invests in addition to the expenses of the Fund.

Privately Placed Securities Risk. Privately placed securities generally are less liquid than publicly traded securities and the Fund may not always be able to sell such securities without experiencing delays in finding buyers or reducing the sale price for such securities. The disposition of some of the securities held by the Fund may be restricted under federal securities laws. As a result, the Fund may not be able to dispose of such investments at a time when, or at a price at which, it desires to do so and may have to bear expenses of registering these securities, if necessary. These securities may also be difficult to value.

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 the performance of the Fund’s Select Class Shares over the past calendar year. The table shows the average annual total returns for the past one year and life of the Fund. It compares that performance to the Morgan Stanley Capital International (MSCI) World Index (net of foreign withholding taxes) and the Lipper Global Large-Cap Core Funds Index, an index based on the total returns of all 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 any class of 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 the performance of the Fund’s Select Class Shares over the past calendar year. The table shows the average annual total returns for the past one year and life of the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex It compares that performance to the Morgan Stanley Capital International (MSCI) World Index (net of foreign withholding taxes) and the Lipper Global Large-Cap Core Funds Index, an index based on the total returns of all 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 any class of 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, 2014     4.87%   
Worst Quarter 3rd quarter, 2014   –1.95%
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.
Select Shares | JPMorgan Global Research Enhanced Index Fund | Select Class  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%rr_ManagementFeesOverAssets
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Distribution (Rule 12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fee rr_Component1OtherExpensesOverAssets 0.25%rr_Component1OtherExpensesOverAssets
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Remainder of Other Expenses rr_Component2OtherExpensesOverAssets 0.11%rr_Component2OtherExpensesOverAssets
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Other Expenses rr_OtherExpensesOverAssets 0.36%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 0.57%rr_ExpensesOverAssets
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Fee Waivers and Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%)rr_FeeWaiverOrReimbursementOverAssets
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[1]
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements rr_NetExpensesOverAssets 0.35%rr_NetExpensesOverAssets
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[1]
1 Year rr_ExpenseExampleYear01 36rr_ExpenseExampleYear01
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3 Years rr_ExpenseExampleYear03 160rr_ExpenseExampleYear03
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5 Years rr_ExpenseExampleYear05 296rr_ExpenseExampleYear05
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10 Years rr_ExpenseExampleYear10 693rr_ExpenseExampleYear10
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1 Year rr_ExpenseExampleNoRedemptionYear01 36rr_ExpenseExampleNoRedemptionYear01
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3 Years rr_ExpenseExampleNoRedemptionYear03 160rr_ExpenseExampleNoRedemptionYear03
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5 Years rr_ExpenseExampleNoRedemptionYear05 296rr_ExpenseExampleNoRedemptionYear05
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10 Years rr_ExpenseExampleNoRedemptionYear10 693rr_ExpenseExampleNoRedemptionYear10
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2014 rr_AnnualReturn2014 5.65%rr_AnnualReturn2014
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Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2014
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.87%rr_BarChartHighestQuarterlyReturn
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Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2014
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.95%)rr_BarChartLowestQuarterlyReturn
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Past 1 Year rr_AverageAnnualReturnYear01 5.65%rr_AverageAnnualReturnYear01
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Life of Fund rr_AverageAnnualReturnSinceInception 14.21%rr_AverageAnnualReturnSinceInception
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Inception Date rr_AverageAnnualReturnInceptionDate Feb. 28, 2013
Select Shares | JPMorgan Global Research Enhanced Index Fund | Return After Taxes on Distributions | Select Class  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 4.82%rr_AverageAnnualReturnYear01
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Life of Fund rr_AverageAnnualReturnSinceInception 13.42%rr_AverageAnnualReturnSinceInception
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Inception Date rr_AverageAnnualReturnInceptionDate Feb. 28, 2013
Select Shares | JPMorgan Global Research Enhanced Index Fund | Return After Taxes on Distributions and Sale of Fund Shares | Select Class  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 3.65%rr_AverageAnnualReturnYear01
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Life of Fund rr_AverageAnnualReturnSinceInception 10.82%rr_AverageAnnualReturnSinceInception
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Inception Date rr_AverageAnnualReturnInceptionDate Feb. 28, 2013
Select Shares | JPMorgan Global Research Enhanced Index Fund | MSCI WORLD INDEX (net of foreign withholding taxes) (Reflects No Deduction for Fees, Expenses or Taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 4.94%rr_AverageAnnualReturnYear01
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Life of Fund rr_AverageAnnualReturnSinceInception 13.57%rr_AverageAnnualReturnSinceInception
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Select Shares | JPMorgan Global Research Enhanced Index Fund | LIPPER GLOBAL LARGE-CAP CORE FUNDS INDEX (Reflects No Deduction for Taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 Year rr_AverageAnnualReturnYear01 3.98%rr_AverageAnnualReturnYear01
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Life of Fund rr_AverageAnnualReturnSinceInception 13.01%rr_AverageAnnualReturnSinceInception
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[1] The Fund's adviser, administrator and distributor (the Service Providers) have contractually agreed to waive fees and/or reimburse expenses to the extent total annual operating expenses (excluding Acquired Fund Fees and Expenses, dividend expenses relating to short sales, interest, taxes, expenses related to litigation and potential litigation, extraordinary expenses and expenses related to the Board of Trustees' deferred compensation plan) exceed 0.34% of the average daily net assets of Select Class Shares. This contract cannot be terminated prior to 3/1/16, at which time the Service Providers will determine whether or not to renew or revise it.