v3.26.1
Expense Example - Optimum Fund Trust Classes A, C, Institutional
Mar. 31, 2026
USD ($)
Optimum Large Cap Growth Fund | A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 689
Expense Example, with Redemption, 3 Years 937
Expense Example, with Redemption, 5 Years 1,204
Expense Example, with Redemption, 10 Years 1,965
Optimum Large Cap Growth Fund | C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 297
Expense Example, with Redemption, 3 Years 615
Expense Example, with Redemption, 5 Years 1,060
Expense Example, with Redemption, 10 Years 2,293
Optimum Large Cap Growth Fund | Institutional  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 96
Expense Example, with Redemption, 3 Years 306
Expense Example, with Redemption, 5 Years 533
Expense Example, with Redemption, 10 Years 1,187
Optimum Small-Mid Cap Growth Fund | A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 713
Expense Example, with Redemption, 3 Years 1,026
Expense Example, with Redemption, 5 Years 1,361
Expense Example, with Redemption, 10 Years 2,306
Optimum Small-Mid Cap Growth Fund | C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 322
Expense Example, with Redemption, 3 Years 708
Expense Example, with Redemption, 5 Years 1,220
Expense Example, with Redemption, 10 Years 2,627
Optimum Small-Mid Cap Growth Fund | Institutional  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 121
Expense Example, with Redemption, 3 Years 401
Expense Example, with Redemption, 5 Years 702
Expense Example, with Redemption, 10 Years 1,558
Optimum Small-Mid Cap Value Fund | A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 717
Expense Example, with Redemption, 3 Years 1,034
Expense Example, with Redemption, 5 Years 1,373
Expense Example, with Redemption, 10 Years 2,328
Optimum Small-Mid Cap Value Fund | C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 326
Expense Example, with Redemption, 3 Years 716
Expense Example, with Redemption, 5 Years 1,232
Expense Example, with Redemption, 10 Years 2,649
Optimum Small-Mid Cap Value Fund | Institutional  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 125
Expense Example, with Redemption, 3 Years 409
Expense Example, with Redemption, 5 Years 715
Expense Example, with Redemption, 10 Years 1,582
Optimum International Fund | A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 702
Expense Example, with Redemption, 3 Years 969
Expense Example, with Redemption, 5 Years 1,257
Expense Example, with Redemption, 10 Years 2,074
Optimum International Fund | C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 310
Expense Example, with Redemption, 3 Years 649
Expense Example, with Redemption, 5 Years 1,114
Expense Example, with Redemption, 10 Years 2,400
Optimum International Fund | Institutional  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 109
Expense Example, with Redemption, 3 Years 340
Expense Example, with Redemption, 5 Years 590
Expense Example, with Redemption, 10 Years 1,306
Optimum Fixed Income Fund | A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 551
Expense Example, with Redemption, 3 Years 766
Expense Example, with Redemption, 5 Years 998
Expense Example, with Redemption, 10 Years 1,664
Optimum Fixed Income Fund | C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 282
Expense Example, with Redemption, 3 Years 563
Expense Example, with Redemption, 5 Years 970
Expense Example, with Redemption, 10 Years 2,105
Optimum Fixed Income Fund | Institutional  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 81
Expense Example, with Redemption, 3 Years 252
Expense Example, with Redemption, 5 Years 439
Expense Example, with Redemption, 10 Years 978
Optimum Large Cap Value Fund | A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 687
Expense Example, with Redemption, 3 Years 925
Expense Example, with Redemption, 5 Years 1,182
Expense Example, with Redemption, 10 Years 1,914
Optimum Large Cap Value Fund | C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 295
Expense Example, with Redemption, 3 Years 603
Expense Example, with Redemption, 5 Years 1,037
Expense Example, with Redemption, 10 Years 2,243
Optimum Large Cap Value Fund | Institutional  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 94
Expense Example, with Redemption, 3 Years 293
Expense Example, with Redemption, 5 Years 509
Expense Example, with Redemption, 10 Years $ 1,131