v3.26.1
Shareholder Report
12 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Undiscovered Managers Funds
Entity Central Index Key 0001047712
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
C000126248 [Member]  
Shareholder Report [Line Items]  
Fund Name Undiscovered Managers Behavioral Value Fund
Class Name Class R6 Shares
Trading Symbol UBVFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Undiscovered Managers Behavioral Value Fund (the "Fund") for the period of July 1, 2025 to June 30, 2026.
Shareholder Report Annual or Semi-Annual 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.Website.Support@jpmorganfunds.com or by asking any financial intermediary that offers shares of the Fund.
Material Fund Change Notice [Text Block]
This report describes material changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-480-4111
Additional Information Email Funds.Website.Support@jpmorganfunds.com
Additional Information Website www.jpmorganfunds.com/funddocuments
Expenses [Text Block]
What were the Fund costs for the last year?
(based on a hypothetical $10,000 investment)
Fund (Class) Costs of a
$10,000 investment
Costs paid as a percentage
of a $10,000 investment
Undiscovered Managers Behavioral Value Fund
(Class R6 Shares)
$87 0.80%
Expenses Paid, Amount $ 87
Expense Ratio, Percent 0.80%
Factors Affecting Performance [Text Block]
How did the Fund Perform?
The Undiscovered Managers Behavioral Value Fund's Class R6 Shares returned 17.45% for the twelve months ended June 30, 2026. The Russell 3000 Index (the "Index") returned 22.82% and the Russell 2000 Value Index returned 43.01% for the twelve months ended June 30, 2026.
  • For the twelve months ended June 30, 2026, the Index increased substantially due to ownership of stocks exhibiting strong momentum, high volatility, and perceived benefits from the buildout of AI infrastructure. The Fund was unable to replicate this return largely due to its exposure to less volatile companies.
  • The Fund’s security selection in the materials and health care sectors and average underweight in the information technology sector detracted from performance relative to the Index.
  • The Fund’s average underweight to the consumer discretionary and financials sectors, average overweight to the materials sector, and security selection in the real estate sector contributed to performance relative to the Index.
  • During the reporting period, the Fund’s largest sector overweights compared to the Index were in the materials and industrials sectors, while its largest sector underweights compared to the Index were in the information technology and energy sectors.
  • The Fund’s sub-adviser, Fuller & Thaler Asset Management Inc., looked for stocks that it believed were mispriced based on behavioral biases. The sub-adviser generally utilizes a three-pronged approach that includes: i) positive signals such as significant share purchases by company insiders or stock repurchase activity by the company; ii) evidence of market over-reaction due to behavioral factors; and iii) analysis of the company’s fundamentals with regard to business model, valuation and credit risk.
Performance Past Does Not Indicate Future [Text] The performance quoted is past performance and is not a guarantee of future results.
Line Graph [Table Text Block]
Fund Performance
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS INCEPTION
DATE
1 YEAR 5 YEAR 10 YEAR
Undiscovered Managers Behavioral Value Fund (Class R6 Shares) April 30, 2013 17.45 % 8.52 % 10.64 %
Russell 3000 Index 22.82 12.31 15.06
Russell 2000 Value Index 43.01 8.23 10.89
Performance Inception Date Apr. 30, 2013
No Deduction of Taxes [Text Block] Also, performance shown in this section does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on gains resulting from redemptions of Fund shares.
Material Change Date Nov. 01, 2025
Updated Performance Information Location [Text Block] Updated performance information is available by visiting www.jpmorganfunds.com or by calling 1-800-480-4111.
Net Assets $ 9,005,869,000
Holdings Count | Holding 88
Advisory Fees Paid, Amount $ 65,693,000
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]

KEY FUND STATISTICS
Fund net assets (000's) $9,005,869
Total number of portfolio holdings 88
Portfolio turnover rate 31 %
Total advisory fees paid (000's) $65,693
Holdings [Text Block]
PORTFOLIO COMPOSITION - SECTOR
(% of Total Investments)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material changes to the Fund during the period
Effective June 12, 2026, Class R6 Shares of the Fund are no longer subject to a limited offering.
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Material Fund Change Risks Change [Text Block]
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Updated Prospectus Phone Number 1-800-480-4111
Updated Prospectus Web Address www.jpmorganfunds/com/funddocuments
C000177425 [Member]  
Shareholder Report [Line Items]  
Fund Name Undiscovered Managers Behavioral Value Fund
Class Name Class R5 Shares
Trading Symbol UBVVX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Undiscovered Managers Behavioral Value Fund (the "Fund") for the period of July 1, 2025 to June 30, 2026.
Shareholder Report Annual or Semi-Annual 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.Website.Support@jpmorganfunds.com or by asking any financial intermediary that offers shares of the Fund.
Material Fund Change Notice [Text Block]
This report describes material changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-480-4111
Additional Information Email Funds.Website.Support@jpmorganfunds.com
Additional Information Website www.jpmorganfunds.com/funddocuments
Expenses [Text Block]
What were the Fund costs for the last year?
(based on a hypothetical $10,000 investment)
Fund (Class) Costs of a
$10,000 investment
Costs paid as a percentage
of a $10,000 investment
Undiscovered Managers Behavioral Value Fund
(Class R5 Shares)
$98 0.90%
Expenses Paid, Amount $ 98
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]
How did the Fund Perform?
The Undiscovered Managers Behavioral Value Fund's Class R5 Shares returned 17.34% for the twelve months ended June 30, 2026. The Russell 3000 Index (the "Index") returned 22.82% and the Russell 2000 Value Index returned 43.01% for the twelve months ended June 30, 2026.
  • For the twelve months ended June 30, 2026, the Index increased substantially due to ownership of stocks exhibiting strong momentum, high volatility, and perceived benefits from the buildout of AI infrastructure. The Fund was unable to replicate this return largely due to its exposure to less volatile companies.
  • The Fund’s security selection in the materials and health care sectors and average underweight in the information technology sector detracted from performance relative to the Index.
  • The Fund’s average underweight to the consumer discretionary and financials sectors, average overweight to the materials sector, and security selection in the real estate sector contributed to performance relative to the Index.
  • During the reporting period, the Fund’s largest sector overweights compared to the Index were in the materials and industrials sectors, while its largest sector underweights compared to the Index were in the information technology and energy sectors.
  • The Fund’s sub-adviser, Fuller & Thaler Asset Management Inc., looked for stocks that it believed were mispriced based on behavioral biases. The sub-adviser generally utilizes a three-pronged approach that includes: i) positive signals such as significant share purchases by company insiders or stock repurchase activity by the company; ii) evidence of market over-reaction due to behavioral factors; and iii) analysis of the company’s fundamentals with regard to business model, valuation and credit risk.
Performance Past Does Not Indicate Future [Text] The performance quoted is past performance and is not a guarantee of future results.
Line Graph [Table Text Block]
Fund Performance
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS INCEPTION
DATE
1 YEAR 5 YEAR 10 YEAR
Undiscovered Managers Behavioral Value Fund (Class R5 Shares) March 1, 2017 17.34 % 8.42 % 10.53 %
Russell 3000 Index 22.82 12.31 15.06
Russell 2000 Value Index 43.01 8.23 10.89
Performance Inception Date Mar. 01, 2017
No Deduction of Taxes [Text Block] Also, performance shown in this section does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on gains resulting from redemptions of Fund shares.
Material Change Date Nov. 01, 2025
Updated Performance Information Location [Text Block] Updated performance information is available by visiting www.jpmorganfunds.com or by calling 1-800-480-4111.
Net Assets $ 9,005,869,000
Holdings Count | Holding 88
Advisory Fees Paid, Amount $ 65,693,000
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]

KEY FUND STATISTICS
Fund net assets (000's) $9,005,869
Total number of portfolio holdings 88
Portfolio turnover rate 31 %
Total advisory fees paid (000's) $65,693
Holdings [Text Block]
PORTFOLIO COMPOSITION - SECTOR
(% of Total Investments)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material changes to the Fund during the period
Effective June 12, 2026, Class R5 Shares of the Fund are no longer subject to a limited offering.
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Material Fund Change Risks Change [Text Block]
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Updated Prospectus Phone Number 1-800-480-4111
Updated Prospectus Web Address www.jpmorganfunds/com/funddocuments
C000177424 [Member]  
Shareholder Report [Line Items]  
Fund Name Undiscovered Managers Behavioral Value Fund
Class Name Class R4 Shares
Trading Symbol UBVUX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Undiscovered Managers Behavioral Value Fund (the "Fund") for the period of July 1, 2025 to June 30, 2026.
Shareholder Report Annual or Semi-Annual 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.Website.Support@jpmorganfunds.com or by asking any financial intermediary that offers shares of the Fund.
Material Fund Change Notice [Text Block]
This report describes material changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-480-4111
Additional Information Email Funds.Website.Support@jpmorganfunds.com
Additional Information Website www.jpmorganfunds.com/funddocuments
Expenses [Text Block]
What were the Fund costs for the last year?
(based on a hypothetical $10,000 investment)
Fund (Class) Costs of a
$10,000 investment
Costs paid as a percentage
of a $10,000 investment
Undiscovered Managers Behavioral Value Fund
(Class R4 Shares)
$114 1.05%
Expenses Paid, Amount $ 114
Expense Ratio, Percent 1.05%
Factors Affecting Performance [Text Block]
How did the Fund Perform?
The Undiscovered Managers Behavioral Value Fund's Class R4 Shares returned 17.16% for the twelve months ended June 30, 2026. The Russell 3000 Index (the "Index") returned 22.82% and the Russell 2000 Value Index returned 43.01% for the twelve months ended June 30, 2026.
  • For the twelve months ended June 30, 2026, the Index increased substantially due to ownership of stocks exhibiting strong momentum, high volatility, and perceived benefits from the buildout of AI infrastructure. The Fund was unable to replicate this return largely due to its exposure to less volatile companies.
  • The Fund’s security selection in the materials and health care sectors and average underweight in the information technology sector detracted from performance relative to the Index.
  • The Fund’s average underweight to the consumer discretionary and financials sectors, average overweight to the materials sector, and security selection in the real estate sector contributed to performance relative to the Index.
  • During the reporting period, the Fund’s largest sector overweights compared to the Index were in the materials and industrials sectors, while its largest sector underweights compared to the Index were in the information technology and energy sectors.
  • The Fund’s sub-adviser, Fuller & Thaler Asset Management Inc., looked for stocks that it believed were mispriced based on behavioral biases. The sub-adviser generally utilizes a three-pronged approach that includes: i) positive signals such as significant share purchases by company insiders or stock repurchase activity by the company; ii) evidence of market over-reaction due to behavioral factors; and iii) analysis of the company’s fundamentals with regard to business model, valuation and credit risk.
Performance Past Does Not Indicate Future [Text] The performance quoted is past performance and is not a guarantee of future results.
Line Graph [Table Text Block]
Fund Performance
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS INCEPTION
DATE
1 YEAR 5 YEAR 10 YEAR
Undiscovered Managers Behavioral Value Fund (Class R4 Shares) March 1, 2017 17.16 % 8.25 % 10.36 %
Russell 3000 Index 22.82 12.31 15.06
Russell 2000 Value Index 43.01 8.23 10.89
Performance Inception Date Mar. 01, 2017
No Deduction of Taxes [Text Block] Also, performance shown in this section does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on gains resulting from redemptions of Fund shares.
Material Change Date Nov. 01, 2025
Updated Performance Information Location [Text Block] Updated performance information is available by visiting www.jpmorganfunds.com or by calling 1-800-480-4111.
Net Assets $ 9,005,869,000
Holdings Count | Holding 88
Advisory Fees Paid, Amount $ 65,693,000
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]

KEY FUND STATISTICS
Fund net assets (000's) $9,005,869
Total number of portfolio holdings 88
Portfolio turnover rate 31 %
Total advisory fees paid (000's) $65,693
Holdings [Text Block]
PORTFOLIO COMPOSITION - SECTOR
(% of Total Investments)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material changes to the Fund during the period
Effective June 12, 2026, Class R4 Shares of the Fund are no longer subject to a limited offering.
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Material Fund Change Risks Change [Text Block]
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Updated Prospectus Phone Number 1-800-480-4111
Updated Prospectus Web Address www.jpmorganfunds/com/funddocuments
C000177423 [Member]  
Shareholder Report [Line Items]  
Fund Name Undiscovered Managers Behavioral Value Fund
Class Name Class R3 Shares
Trading Symbol UBVTX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Undiscovered Managers Behavioral Value Fund (the "Fund") for the period of July 1, 2025 to June 30, 2026.
Shareholder Report Annual or Semi-Annual 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.Website.Support@jpmorganfunds.com or by asking any financial intermediary that offers shares of the Fund.
Material Fund Change Notice [Text Block]
This report describes material changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-480-4111
Additional Information Email Funds.Website.Support@jpmorganfunds.com
Additional Information Website www.jpmorganfunds.com/funddocuments
Expenses [Text Block]
What were the Fund costs for the last year?
(based on a hypothetical $10,000 investment)
Fund (Class) Costs of a
$10,000 investment
Costs paid as a percentage
of a $10,000 investment
Undiscovered Managers Behavioral Value Fund
(Class R3 Shares)
$141 1.30%
Expenses Paid, Amount $ 141
Expense Ratio, Percent 1.30%
Factors Affecting Performance [Text Block]
How did the Fund Perform?
The Undiscovered Managers Behavioral Value Fund's Class R3 Shares returned 16.88% for the twelve months ended June 30, 2026. The Russell 3000 Index (the "Index") returned 22.82% and the Russell 2000 Value Index returned 43.01% for the twelve months ended June 30, 2026.
  • For the twelve months ended June 30, 2026, the Index increased substantially due to ownership of stocks exhibiting strong momentum, high volatility, and perceived benefits from the buildout of AI infrastructure. The Fund was unable to replicate this return largely due to its exposure to less volatile companies.
  • The Fund’s security selection in the materials and health care sectors and average underweight in the information technology sector detracted from performance relative to the Index.
  • The Fund’s average underweight to the consumer discretionary and financials sectors, average overweight to the materials sector, and security selection in the real estate sector contributed to performance relative to the Index.
  • During the reporting period, the Fund’s largest sector overweights compared to the Index were in the materials and industrials sectors, while its largest sector underweights compared to the Index were in the information technology and energy sectors.
  • The Fund’s sub-adviser, Fuller & Thaler Asset Management Inc., looked for stocks that it believed were mispriced based on behavioral biases. The sub-adviser generally utilizes a three-pronged approach that includes: i) positive signals such as significant share purchases by company insiders or stock repurchase activity by the company; ii) evidence of market over-reaction due to behavioral factors; and iii) analysis of the company’s fundamentals with regard to business model, valuation and credit risk.
Performance Past Does Not Indicate Future [Text] The performance quoted is past performance and is not a guarantee of future results.
Line Graph [Table Text Block]
Fund Performance
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS INCEPTION
DATE
1 YEAR 5 YEAR 10 YEAR
Undiscovered Managers Behavioral Value Fund (Class R3 Shares) March 1, 2017 16.88 % 7.99 % 10.09 %
Russell 3000 Index 22.82 12.31 15.06
Russell 2000 Value Index 43.01 8.23 10.89
Performance Inception Date Mar. 01, 2017
No Deduction of Taxes [Text Block] Also, performance shown in this section does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on gains resulting from redemptions of Fund shares.
Material Change Date Nov. 01, 2025
Updated Performance Information Location [Text Block] Updated performance information is available by visiting www.jpmorganfunds.com or by calling 1-800-480-4111.
Net Assets $ 9,005,869,000
Holdings Count | Holding 88
Advisory Fees Paid, Amount $ 65,693,000
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]

KEY FUND STATISTICS
Fund net assets (000's) $9,005,869
Total number of portfolio holdings 88
Portfolio turnover rate 31 %
Total advisory fees paid (000's) $65,693
Holdings [Text Block]
PORTFOLIO COMPOSITION - SECTOR
(% of Total Investments)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material changes to the Fund during the period
Effective June 12, 2026, Class R3 Shares of the Fund are no longer subject to a limited offering.
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Material Fund Change Risks Change [Text Block]
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Updated Prospectus Phone Number 1-800-480-4111
Updated Prospectus Web Address www.jpmorganfunds/com/funddocuments
C000126247 [Member]  
Shareholder Report [Line Items]  
Fund Name Undiscovered Managers Behavioral Value Fund
Class Name Class R2 Shares
Trading Symbol UBVRX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Undiscovered Managers Behavioral Value Fund (the "Fund") for the period of July 1, 2025 to June 30, 2026.
Shareholder Report Annual or Semi-Annual 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.Website.Support@jpmorganfunds.com or by asking any financial intermediary that offers shares of the Fund.
Material Fund Change Notice [Text Block]
This report describes material changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-480-4111
Additional Information Email Funds.Website.Support@jpmorganfunds.com
Additional Information Website www.jpmorganfunds.com/funddocuments
Expenses [Text Block]
What were the Fund costs for the last year?
(based on a hypothetical $10,000 investment)
Fund (Class) Costs of a
$10,000 investment
Costs paid as a percentage
of a $10,000 investment
Undiscovered Managers Behavioral Value Fund
(Class R2 Shares)
$168 1.55%
Expenses Paid, Amount $ 168
Expense Ratio, Percent 1.55%
Factors Affecting Performance [Text Block]
How did the Fund Perform?
The Undiscovered Managers Behavioral Value Fund's Class R2 Shares returned 16.59% for the twelve months ended June 30, 2026. The Russell 3000 Index (the "Index") returned 22.82% and the Russell 2000 Value Index returned 43.01% for the twelve months ended June 30, 2026.
  • For the twelve months ended June 30, 2026, the Index increased substantially due to ownership of stocks exhibiting strong momentum, high volatility, and perceived benefits from the buildout of AI infrastructure. The Fund was unable to replicate this return largely due to its exposure to less volatile companies.
  • The Fund’s security selection in the materials and health care sectors and average underweight in the information technology sector detracted from performance relative to the Index.
  • The Fund’s average underweight to the consumer discretionary and financials sectors, average overweight to the materials sector, and security selection in the real estate sector contributed to performance relative to the Index.
  • During the reporting period, the Fund’s largest sector overweights compared to the Index were in the materials and industrials sectors, while its largest sector underweights compared to the Index were in the information technology and energy sectors.
  • The Fund’s sub-adviser, Fuller & Thaler Asset Management Inc., looked for stocks that it believed were mispriced based on behavioral biases. The sub-adviser generally utilizes a three-pronged approach that includes: i) positive signals such as significant share purchases by company insiders or stock repurchase activity by the company; ii) evidence of market over-reaction due to behavioral factors; and iii) analysis of the company’s fundamentals with regard to business model, valuation and credit risk.
Performance Past Does Not Indicate Future [Text] The performance quoted is past performance and is not a guarantee of future results.
Line Graph [Table Text Block]
Fund Performance
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS INCEPTION
DATE
1 YEAR 5 YEAR 10 YEAR
Undiscovered Managers Behavioral Value Fund (Class R2 Shares) April 30, 2013 16.59 % 7.71 % 9.81 %
Russell 3000 Index 22.82 12.31 15.06
Russell 2000 Value Index 43.01 8.23 10.89
Performance Inception Date Apr. 30, 2013
No Deduction of Taxes [Text Block] Also, performance shown in this section does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on gains resulting from redemptions of Fund shares.
Material Change Date Nov. 01, 2025
Updated Performance Information Location [Text Block] Updated performance information is available by visiting www.jpmorganfunds.com or by calling 1-800-480-4111.
Net Assets $ 9,005,869,000
Holdings Count | Holding 88
Advisory Fees Paid, Amount $ 65,693,000
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]

KEY FUND STATISTICS
Fund net assets (000's) $9,005,869
Total number of portfolio holdings 88
Portfolio turnover rate 31 %
Total advisory fees paid (000's) $65,693
Holdings [Text Block]
PORTFOLIO COMPOSITION - SECTOR
(% of Total Investments)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material changes to the Fund during the period
Effective June 12, 2026, Class R2 Shares of the Fund are no longer subject to a limited offering.
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Material Fund Change Risks Change [Text Block]
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Updated Prospectus Phone Number 1-800-480-4111
Updated Prospectus Web Address www.jpmorganfunds/com/funddocuments
C000011783 [Member]  
Shareholder Report [Line Items]  
Fund Name Undiscovered Managers Behavioral Value Fund
Class Name Class L Shares
Trading Symbol UBVLX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Undiscovered Managers Behavioral Value Fund (the "Fund") for the period of July 1, 2025 to June 30, 2026.
Shareholder Report Annual or Semi-Annual 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.Website.Support@jpmorganfunds.com or by asking any financial intermediary that offers shares of the Fund.
Material Fund Change Notice [Text Block]
This report describes material changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-480-4111
Additional Information Email Funds.Website.Support@jpmorganfunds.com
Additional Information Website www.jpmorganfunds.com/funddocuments
Expenses [Text Block]
What were the Fund costs for the last year?
(based on a hypothetical $10,000 investment)
Fund (Class) Costs of a
$10,000 investment
Costs paid as a percentage
of a $10,000 investment
Undiscovered Managers Behavioral Value Fund
(Class L Shares)
$98 0.90%
Expenses Paid, Amount $ 98
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]
How did the Fund Perform?
The Undiscovered Managers Behavioral Value Fund's Class L Shares returned 17.34% for the twelve months ended June 30, 2026. The Russell 3000 Index (the "Index") returned 22.82% and the Russell 2000 Value Index returned 43.01% for the twelve months ended June 30, 2026.
  • For the twelve months ended June 30, 2026, the Index increased substantially due to ownership of stocks exhibiting strong momentum, high volatility, and perceived benefits from the buildout of AI infrastructure. The Fund was unable to replicate this return largely due to its exposure to less volatile companies.
  • The Fund’s security selection in the materials and health care sectors and average underweight in the information technology sector detracted from performance relative to the Index.
  • The Fund’s average underweight to the consumer discretionary and financials sectors, average overweight to the materials sector, and security selection in the real estate sector contributed to performance relative to the Index.
  • During the reporting period, the Fund’s largest sector overweights compared to the Index were in the materials and industrials sectors, while its largest sector underweights compared to the Index were in the information technology and energy sectors.
  • The Fund’s sub-adviser, Fuller & Thaler Asset Management Inc., looked for stocks that it believed were mispriced based on behavioral biases. The sub-adviser generally utilizes a three-pronged approach that includes: i) positive signals such as significant share purchases by company insiders or stock repurchase activity by the company; ii) evidence of market over-reaction due to behavioral factors; and iii) analysis of the company’s fundamentals with regard to business model, valuation and credit risk.
Performance Past Does Not Indicate Future [Text] The performance quoted is past performance and is not a guarantee of future results.
Line Graph [Table Text Block]
Fund Performance
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS INCEPTION
DATE
1 YEAR 5 YEAR 10 YEAR
Undiscovered Managers Behavioral Value Fund (Class L Shares) December 28, 1998 17.34 % 8.42 % 10.53 %
Russell 3000 Index 22.82 12.31 15.06
Russell 2000 Value Index 43.01 8.23 10.89
Performance Inception Date Dec. 28, 1998
No Deduction of Taxes [Text Block] Also, performance shown in this section does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on gains resulting from redemptions of Fund shares.
Updated Performance Information Location [Text Block] Updated performance information is available by visiting www.jpmorganfunds.com or by calling 1-800-480-4111.
Net Assets $ 9,005,869,000
Holdings Count | Holding 88
Advisory Fees Paid, Amount $ 65,693,000
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]

KEY FUND STATISTICS
Fund net assets (000's) $9,005,869
Total number of portfolio holdings 88
Portfolio turnover rate 31 %
Total advisory fees paid (000's) $65,693
Holdings [Text Block]
PORTFOLIO COMPOSITION - SECTOR
(% of Total Investments)
Graphical Representation - Allocation 1 Chart
C000126246 [Member]  
Shareholder Report [Line Items]  
Fund Name Undiscovered Managers Behavioral Value Fund
Class Name Class I Shares
Trading Symbol UBVSX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Undiscovered Managers Behavioral Value Fund (the "Fund") for the period of July 1, 2025 to June 30, 2026.
Shareholder Report Annual or Semi-Annual 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.Website.Support@jpmorganfunds.com or by asking any financial intermediary that offers shares of the Fund.
Material Fund Change Notice [Text Block]
This report describes material changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-480-4111
Additional Information Email Funds.Website.Support@jpmorganfunds.com
Additional Information Website www.jpmorganfunds.com/funddocuments
Expenses [Text Block]
What were the Fund costs for the last year?
(based on a hypothetical $10,000 investment)
Fund (Class) Costs of a
$10,000 investment
Costs paid as a percentage
of a $10,000 investment
Undiscovered Managers Behavioral Value Fund
(Class I Shares)
$107 0.99%
Expenses Paid, Amount $ 107
Expense Ratio, Percent 0.99%
Factors Affecting Performance [Text Block]
How did the Fund Perform?
The Undiscovered Managers Behavioral Value Fund's Class I Shares returned 17.23% for the twelve months ended June 30, 2026. The Russell 3000 Index (the "Index") returned 22.82% and the Russell 2000 Value Index returned 43.01% for the twelve months ended June 30, 2026.
  • For the twelve months ended June 30, 2026, the Index increased substantially due to ownership of stocks exhibiting strong momentum, high volatility, and perceived benefits from the buildout of AI infrastructure. The Fund was unable to replicate this return largely due to its exposure to less volatile companies.
  • The Fund’s security selection in the materials and health care sectors and average underweight in the information technology sector detracted from performance relative to the Index.
  • The Fund’s average underweight to the consumer discretionary and financials sectors, average overweight to the materials sector, and security selection in the real estate sector contributed to performance relative to the Index.
  • During the reporting period, the Fund’s largest sector overweights compared to the Index were in the materials and industrials sectors, while its largest sector underweights compared to the Index were in the information technology and energy sectors.
  • The Fund’s sub-adviser, Fuller & Thaler Asset Management Inc., looked for stocks that it believed were mispriced based on behavioral biases. The sub-adviser generally utilizes a three-pronged approach that includes: i) positive signals such as significant share purchases by company insiders or stock repurchase activity by the company; ii) evidence of market over-reaction due to behavioral factors; and iii) analysis of the company’s fundamentals with regard to business model, valuation and credit risk.
Performance Past Does Not Indicate Future [Text] The performance quoted is past performance and is not a guarantee of future results.
Line Graph [Table Text Block]
Fund Performance
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS INCEPTION
DATE
1 YEAR 5 YEAR 10 YEAR
Undiscovered Managers Behavioral Value Fund (Class I Shares) April 30, 2013 17.23 % 8.31 % 10.39 %
Russell 3000 Index 22.82 12.31 15.06
Russell 2000 Value Index 43.01 8.23 10.89
Performance Inception Date Apr. 30, 2013
No Deduction of Taxes [Text Block] Also, performance shown in this section does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on gains resulting from redemptions of Fund shares.
Material Change Date Nov. 01, 2025
Updated Performance Information Location [Text Block] Updated performance information is available by visiting www.jpmorganfunds.com or by calling 1-800-480-4111.
Net Assets $ 9,005,869,000
Holdings Count | Holding 88
Advisory Fees Paid, Amount $ 65,693,000
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]

KEY FUND STATISTICS
Fund net assets (000's) $9,005,869
Total number of portfolio holdings 88
Portfolio turnover rate 31 %
Total advisory fees paid (000's) $65,693
Holdings [Text Block]
PORTFOLIO COMPOSITION - SECTOR
(% of Total Investments)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material changes to the Fund during the period
Effective June 12, 2026, Class I Shares of the Fund are no longer subject to a limited offering.
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Material Fund Change Risks Change [Text Block]
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Updated Prospectus Phone Number 1-800-480-4111
Updated Prospectus Web Address www.jpmorganfunds/com/funddocuments
C000011786 [Member]  
Shareholder Report [Line Items]  
Fund Name Undiscovered Managers Behavioral Value Fund
Class Name Class C Shares
Trading Symbol UBVCX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Undiscovered Managers Behavioral Value Fund (the "Fund") for the period of July 1, 2025 to June 30, 2026.
Shareholder Report Annual or Semi-Annual 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.Website.Support@jpmorganfunds.com or by asking any financial intermediary that offers shares of the Fund.
Material Fund Change Notice [Text Block]
This report describes material changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-480-4111
Additional Information Email Funds.Website.Support@jpmorganfunds.com
Additional Information Website www.jpmorganfunds.com/funddocuments
Expenses [Text Block]
What were the Fund costs for the last year?
(based on a hypothetical $10,000 investment)
Fund (Class) Costs of a
$10,000 investment
Costs paid as a percentage
of a $10,000 investment
Undiscovered Managers Behavioral Value Fund
(Class C Shares)
$188 1.74%
Expenses Paid, Amount $ 188
Expense Ratio, Percent 1.74%
Factors Affecting Performance [Text Block]
How did the Fund Perform?
The Undiscovered Managers Behavioral Value Fund's Class C Shares, without a sales charge, returned 16.37% for the twelve months ended June 30, 2026. The Russell 3000 Index (the "Index") returned 22.82% and the Russell 2000 Value Index returned 43.01% for the twelve months ended June 30, 2026.
  • For the twelve months ended June 30, 2026, the Index increased substantially due to ownership of stocks exhibiting strong momentum, high volatility, and perceived benefits from the buildout of AI infrastructure. The Fund was unable to replicate this return largely due to its exposure to less volatile companies.
  • The Fund’s security selection in the materials and health care sectors and average underweight in the information technology sector detracted from performance relative to the Index.
  • The Fund’s average underweight to the consumer discretionary and financials sectors, average overweight to the materials sector, and security selection in the real estate sector contributed to performance relative to the Index.
  • During the reporting period, the Fund’s largest sector overweights compared to the Index were in the materials and industrials sectors, while its largest sector underweights compared to the Index were in the information technology and energy sectors.
  • The Fund’s sub-adviser, Fuller & Thaler Asset Management Inc., looked for stocks that it believed were mispriced based on behavioral biases. The sub-adviser generally utilizes a three-pronged approach that includes: i) positive signals such as significant share purchases by company insiders or stock repurchase activity by the company; ii) evidence of market over-reaction due to behavioral factors; and iii) analysis of the company’s fundamentals with regard to business model, valuation and credit risk.
Performance Past Does Not Indicate Future [Text] The performance quoted is past performance and is not a guarantee of future results.
Line Graph [Table Text Block]
Fund Performance
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS INCEPTION
DATE
1 YEAR 5 YEAR 10 YEAR
Undiscovered Managers Behavioral Value Fund (Class C Shares) June 4, 2004 15.37 % 7.50 % 9.68 %
Undiscovered Managers Behavioral Value Fund (Class C Shares) - excluding sales charge 16.37 7.50 9.68
Russell 3000 Index 22.82 12.31 15.06
Russell 2000 Value Index 43.01 8.23 10.89
Performance Inception Date Jun. 04, 2004
No Deduction of Taxes [Text Block] Also, performance shown in this section does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on gains resulting from redemptions of Fund shares.
Material Change Date Nov. 01, 2025
Updated Performance Information Location [Text Block] Updated performance information is available by visiting www.jpmorganfunds.com or by calling 1-800-480-4111.
Net Assets $ 9,005,869,000
Holdings Count | Holding 88
Advisory Fees Paid, Amount $ 65,693,000
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]

KEY FUND STATISTICS
Fund net assets (000's) $9,005,869
Total number of portfolio holdings 88
Portfolio turnover rate 31 %
Total advisory fees paid (000's) $65,693
Holdings [Text Block]
PORTFOLIO COMPOSITION - SECTOR
(% of Total Investments)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material changes to the Fund during the period
Effective June 12, 2026, Class C Shares of the Fund are no longer subject to a limited offering.
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Material Fund Change Risks Change [Text Block]
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Updated Prospectus Phone Number 1-800-480-4111
Updated Prospectus Web Address www.jpmorganfunds/com/funddocuments
C000011784 [Member]  
Shareholder Report [Line Items]  
Fund Name Undiscovered Managers Behavioral Value Fund
Class Name Class A Shares
Trading Symbol UBVAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Undiscovered Managers Behavioral Value Fund (the "Fund") for the period of July 1, 2025 to June 30, 2026.
Shareholder Report Annual or Semi-Annual 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.Website.Support@jpmorganfunds.com or by asking any financial intermediary that offers shares of the Fund.
Material Fund Change Notice [Text Block]
This report describes material changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 1-800-480-4111
Additional Information Email Funds.Website.Support@jpmorganfunds.com
Additional Information Website www.jpmorganfunds.com/funddocuments
Expenses [Text Block]
What were the Fund costs for the last year?
(based on a hypothetical $10,000 investment)
Fund (Class) Costs of a
$10,000 investment
Costs paid as a percentage
of a $10,000 investment
Undiscovered Managers Behavioral Value Fund
(Class A Shares)
$134 1.24%
Expenses Paid, Amount $ 134
Expense Ratio, Percent 1.24%
Factors Affecting Performance [Text Block]
How did the Fund Perform?
The Undiscovered Managers Behavioral Value Fund's Class A Shares, without a sales charge, returned 16.95% for the twelve months ended June 30, 2026. The Russell 3000 Index (the "Index") returned 22.82% and the Russell 2000 Value Index returned 43.01% for the twelve months ended June 30, 2026.
  • For the twelve months ended June 30, 2026, the Index increased substantially due to ownership of stocks exhibiting strong momentum, high volatility, and perceived benefits from the buildout of AI infrastructure. The Fund was unable to replicate this return largely due to its exposure to less volatile companies.
  • The Fund’s security selection in the materials and health care sectors and average underweight in the information technology sector detracted from performance relative to the Index.
  • The Fund’s average underweight to the consumer discretionary and financials sectors, average overweight to the materials sector, and security selection in the real estate sector contributed to performance relative to the Index.
  • During the reporting period, the Fund’s largest sector overweights compared to the Index were in the materials and industrials sectors, while its largest sector underweights compared to the Index were in the information technology and energy sectors.
  • The Fund’s sub-adviser, Fuller & Thaler Asset Management Inc., looked for stocks that it believed were mispriced based on behavioral biases. The sub-adviser generally utilizes a three-pronged approach that includes: i) positive signals such as significant share purchases by company insiders or stock repurchase activity by the company; ii) evidence of market over-reaction due to behavioral factors; and iii) analysis of the company’s fundamentals with regard to business model, valuation and credit risk.
Performance Past Does Not Indicate Future [Text] The performance quoted is past performance and is not a guarantee of future results.
Line Graph [Table Text Block]
Fund Performance
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS INCEPTION
DATE
1 YEAR 5 YEAR 10 YEAR
Undiscovered Managers Behavioral Value Fund (Class A Shares) June 4, 2004 10.81 % 6.88 % 9.53 %
Undiscovered Managers Behavioral Value Fund (Class A Shares) - excluding sales charge 16.95 8.04 10.12
Russell 3000 Index 22.82 12.31 15.06
Russell 2000 Value Index 43.01 8.23 10.89
Performance Inception Date Jun. 04, 2004
No Deduction of Taxes [Text Block] Also, performance shown in this section does not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on gains resulting from redemptions of Fund shares.
Material Change Date Nov. 01, 2025
Updated Performance Information Location [Text Block] Updated performance information is available by visiting www.jpmorganfunds.com or by calling 1-800-480-4111.
Net Assets $ 9,005,869,000
Holdings Count | Holding 88
Advisory Fees Paid, Amount $ 65,693,000
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block]

KEY FUND STATISTICS
Fund net assets (000's) $9,005,869
Total number of portfolio holdings 88
Portfolio turnover rate 31 %
Total advisory fees paid (000's) $65,693
Holdings [Text Block]
PORTFOLIO COMPOSITION - SECTOR
(% of Total Investments)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material changes to the Fund during the period
Effective June 12, 2026, Class A Shares of the Fund are no longer subject to a limited offering.
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Material Fund Change Risks Change [Text Block]
The Fund added “Industrials Sector Risk” disclosure to its summary prospectus as of November 1, 2025. This disclosure was added in light of a larger concentration of portfolio securities in this sector.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since July 1, 2025. For more complete information, you may review the Fund’s prospectus at www.jpmorganfunds/com/funddocuments or upon request at 1-800-480-4111.
Updated Prospectus Phone Number 1-800-480-4111
Updated Prospectus Web Address www.jpmorganfunds/com/funddocuments