v3.26.3
JPMorgan U.S. Small Company Fund Expense Example - R2 R3 R4 R5 R6 Shares [Member] - JPMorgan U.S. Small Company Fund
Jun. 30, 2026
USD ($)
Class R2  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 143
Expense Example, with Redemption, 3 Years 460
Expense Example, with Redemption, 5 Years 800
Expense Example, with Redemption, 10 Years 1,762
Class R3  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 117
Expense Example, with Redemption, 3 Years 380
Expense Example, with Redemption, 5 Years 664
Expense Example, with Redemption, 10 Years 1,471
Class R4  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 92
Expense Example, with Redemption, 3 Years 302
Expense Example, with Redemption, 5 Years 529
Expense Example, with Redemption, 10 Years 1,183
Class R5  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 77
Expense Example, with Redemption, 3 Years 255
Expense Example, with Redemption, 5 Years 448
Expense Example, with Redemption, 10 Years 1,007
Class R6  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 66
Expense Example, with Redemption, 3 Years 223
Expense Example, with Redemption, 5 Years 394
Expense Example, with Redemption, 10 Years $ 888