| Form N-CSR Cover | 6 Months Ended |
| Apr. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | JPMorgan Trust I |
| Entity Central Index Key | 0001217286 |
| Document Period End Date | Apr. 30, 2024 |
| Shareholder Report | 6 Months Ended | |
| Apr. 30, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | JPMorgan Trust I | |
| Entity Central Index Key | 0001217286 | |
| Document Period End Date | Apr. 30, 2024 | |
| C000081100 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | JPMorgan Research Market Neutral Fund | |
| Class Name | Class I Shares | |
| Trading Symbol | JMNSX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the JPMorgan Research Market Neutral Fund for the period of November 1, 2023 to April 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.jpmorganfunds.com/funddocuments. You can also request this information by contacting us at 1-800-480-4111, by sending an e-mail request to Funds. | |
| Additional Information Phone Number | 1-800-480-4111 | |
| Additional Information Email | Website.Support@jpmorganfunds.com | |
| Additional Information Website | www.jpmorganfunds.com/funddocuments | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund (Class) Costs of a * Costs paid as a percentage ** JPMorgan Research Market Neutral Fund $ 2.55 % * This charge is annualized. ** Includes dividend expense on short sales. | |
| Expenses Paid, Amount | $ 134 | [1] |
| Expense Ratio, Percent | 2.55% | [2] |
| Net Assets | $ 254,063,000 | |
| Holdings Count | Holding | 328 | |
| Investment Company Portfolio Turnover | 112% | [3] |
| Additional Fund Statistics [Text Block] | Fund net assets after future share reacquisition adjustment (000's) $ Total number of portfolio holdings $ Portfolio turnover rate $ %* * Not annualized. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION - LONG PORTFOLIO COMPOSITION - SHORT | |
| C000007189 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | JPMorgan Research Market Neutral Fund | |
| Class Name | Class A Shares | |
| Trading Symbol | JMNAX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the JPMorgan Research Market Neutral Fund for the period of November 1, 2023 to April 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.jpmorganfunds.com/funddocuments. You can also request this information by contacting us at 1-800-480-4111, by sending an e-mail request to Funds. | |
| Additional Information Phone Number | 1-800-480-4111 | |
| Additional Information Email | Website.Support@jpmorganfunds.com | |
| Additional Information Website | www.jpmorganfunds.com/funddocuments | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund (Class) Costs of a * Costs paid as a percentage ** JPMorgan Research Market Neutral Fund $ 2.81 % * This charge is annualized. ** Includes dividend expense on short sales. | |
| Expenses Paid, Amount | $ 148 | [4] |
| Expense Ratio, Percent | 2.81% | [5] |
| Net Assets | $ 254,063,000 | |
| Holdings Count | Holding | 328 | |
| Investment Company Portfolio Turnover | 112% | [6] |
| Additional Fund Statistics [Text Block] | Fund net assets after future share reacquisition adjustment (000's) $ Total number of portfolio holdings $ Portfolio turnover rate $ %* * Not annualized. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION - LONG PORTFOLIO COMPOSITION - SHORT | |
| C000081099 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | JPMorgan Research Market Neutral Fund | |
| Class Name | Class C Shares | |
| Trading Symbol | JMNCX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the JPMorgan Research Market Neutral Fund for the period of November 1, 2023 to April 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at www.jpmorganfunds.com/funddocuments. You can also request this information by contacting us at 1-800-480-4111, by sending an e-mail request to Funds. | |
| Additional Information Phone Number | 1-800-480-4111 | |
| Additional Information Email | Website.Support@jpmorganfunds.com | |
| Additional Information Website | www.jpmorganfunds.com/funddocuments | |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund (Class) Costs of a * Costs paid as a percentage JPMorgan Research Market Neutral Fund $ 3.28 % * This charge is annualized. ** Includes dividend expense on short sales. | |
| Expenses Paid, Amount | $ 173 | [7] |
| Expense Ratio, Percent | 3.28% | [8] |
| Net Assets | $ 254,063,000 | |
| Holdings Count | Holding | 328 | |
| Investment Company Portfolio Turnover | 112% | [9] |
| Additional Fund Statistics [Text Block] | Fund net assets after future share reacquisition adjustment (000's) $ Total number of portfolio holdings $ Portfolio turnover rate $ %* * Not annualized. | |
| Holdings [Text Block] | PORTFOLIO COMPOSITION - LONG PORTFOLIO COMPOSITION - SHORT | |
| [1]This charge is annualized.[2]Includes dividend expense on short sales.[3]Not annualized.[4]This charge is annualized.[5]Includes dividend expense on short sales.[6]Not annualized.[7]This charge is annualized.[8]Includes dividend expense on short sales.[9]Not annualized. | ||
| Shareholder Report, Holdings (Details) | Apr. 30, 2024 |
| C000081100 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 5.10% |
| Percent of Total Short Exposure | 6.90% |
| C000081100 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 1.70% |
| Percent of Total Short Exposure | 2.70% |
| C000081100 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 16.90% |
| Percent of Total Short Exposure | 18.30% |
| C000081100 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 3.70% |
| Percent of Total Short Exposure | 3.70% |
| C000081100 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 8% |
| Percent of Total Short Exposure | 6.40% |
| C000081100 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 9.80% |
| Percent of Total Short Exposure | 17.40% |
| C000081100 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 1.20% |
| Percent of Total Short Exposure | 0.60% |
| C000081100 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 19.80% |
| Percent of Total Short Exposure | 19.80% |
| C000081100 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 3.90% |
| Percent of Total Short Exposure | 7.50% |
| C000081100 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 9.60% |
| Percent of Total Short Exposure | 12.10% |
| C000081100 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 3.40% |
| Percent of Total Short Exposure | 4.60% |
| C000081100 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 16.90% |
| C000007189 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 5.10% |
| Percent of Total Short Exposure | 6.90% |
| C000007189 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 1.70% |
| Percent of Total Short Exposure | 2.70% |
| C000007189 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 16.90% |
| Percent of Total Short Exposure | 18.30% |
| C000007189 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 3.70% |
| Percent of Total Short Exposure | 3.70% |
| C000007189 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 8% |
| Percent of Total Short Exposure | 6.40% |
| C000007189 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 9.80% |
| Percent of Total Short Exposure | 17.40% |
| C000007189 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 1.20% |
| Percent of Total Short Exposure | 0.60% |
| C000007189 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 19.80% |
| Percent of Total Short Exposure | 19.80% |
| C000007189 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 3.90% |
| Percent of Total Short Exposure | 7.50% |
| C000007189 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 9.60% |
| Percent of Total Short Exposure | 12.10% |
| C000007189 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 3.40% |
| Percent of Total Short Exposure | 4.60% |
| C000007189 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 16.90% |
| C000081099 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 5.10% |
| Percent of Total Short Exposure | 6.90% |
| C000081099 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 1.70% |
| Percent of Total Short Exposure | 2.70% |
| C000081099 [Member] | Information Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 16.90% |
| Percent of Total Short Exposure | 18.30% |
| C000081099 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 3.70% |
| Percent of Total Short Exposure | 3.70% |
| C000081099 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 8% |
| Percent of Total Short Exposure | 6.40% |
| C000081099 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 9.80% |
| Percent of Total Short Exposure | 17.40% |
| C000081099 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 1.20% |
| Percent of Total Short Exposure | 0.60% |
| C000081099 [Member] | Financials [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 19.80% |
| Percent of Total Short Exposure | 19.80% |
| C000081099 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 3.90% |
| Percent of Total Short Exposure | 7.50% |
| C000081099 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 9.60% |
| Percent of Total Short Exposure | 12.10% |
| C000081099 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 3.40% |
| Percent of Total Short Exposure | 4.60% |
| C000081099 [Member] | Short-Term Investments [Member] | |
| Holdings [Line Items] | |
| Percent of Total Long Exposure | 16.90% |
