v3.26.1
Annual Fund Operating Expenses - Optimum Fund Trust Classes A, C, Institutional
Mar. 31, 2026
Optimum Large Cap Growth Fund  
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination July 30, 2027
Optimum Large Cap Growth Fund | A  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.68%
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.29%
Expenses (as a percentage of Assets) 1.22%
Fee Waiver or Reimbursement (0.03%) [1]
Net Expenses (as a percentage of Assets) 1.19%
Optimum Large Cap Growth Fund | C  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.68%
Distribution and Service (12b-1) Fees 1.00%
Other Expenses (as a percentage of Assets): 0.29%
Expenses (as a percentage of Assets) 1.97%
Fee Waiver or Reimbursement (0.03%) [1]
Net Expenses (as a percentage of Assets) 1.94%
Optimum Large Cap Growth Fund | Institutional  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.68%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.29%
Expenses (as a percentage of Assets) 0.97%
Fee Waiver or Reimbursement (0.03%) [1]
Net Expenses (as a percentage of Assets) 0.94%
Optimum Small-Mid Cap Growth Fund  
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination July 30, 2027
Optimum Small-Mid Cap Growth Fund | A  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.97%
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.33%
Expenses (as a percentage of Assets) 1.55%
Fee Waiver or Reimbursement (0.11%) [2]
Net Expenses (as a percentage of Assets) 1.44%
Optimum Small-Mid Cap Growth Fund | C  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.97%
Distribution and Service (12b-1) Fees 1.00%
Other Expenses (as a percentage of Assets): 0.33%
Expenses (as a percentage of Assets) 2.30%
Fee Waiver or Reimbursement (0.11%) [2]
Net Expenses (as a percentage of Assets) 2.19%
Optimum Small-Mid Cap Growth Fund | Institutional  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.97%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.33%
Expenses (as a percentage of Assets) 1.30%
Fee Waiver or Reimbursement (0.11%) [2]
Net Expenses (as a percentage of Assets) 1.19%
Optimum Small-Mid Cap Value Fund  
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination July 30, 2027
Optimum Small-Mid Cap Value Fund | A  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.88%
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.35%
Acquired Fund Fees and Expenses 0.09% [3]
Expenses (as a percentage of Assets) 1.57%
Fee Waiver or Reimbursement (0.09%) [4]
Net Expenses (as a percentage of Assets) 1.48% [5]
Optimum Small-Mid Cap Value Fund | C  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.88%
Distribution and Service (12b-1) Fees 1.00%
Other Expenses (as a percentage of Assets): 0.35%
Acquired Fund Fees and Expenses 0.09% [3]
Expenses (as a percentage of Assets) 2.32%
Fee Waiver or Reimbursement (0.09%) [4]
Net Expenses (as a percentage of Assets) 2.23% [5]
Optimum Small-Mid Cap Value Fund | Institutional  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.88%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.35%
Acquired Fund Fees and Expenses 0.09% [3]
Expenses (as a percentage of Assets) 1.32%
Fee Waiver or Reimbursement (0.09%) [4]
Net Expenses (as a percentage of Assets) 1.23% [5]
Optimum International Fund  
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination July 30, 2027
Optimum International Fund | A  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.73%
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.34%
Expenses (as a percentage of Assets) 1.32%
Fee Waiver or Reimbursement (0.00%) [6]
Net Expenses (as a percentage of Assets) 1.32%
Optimum International Fund | C  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.73%
Distribution and Service (12b-1) Fees 1.00%
Other Expenses (as a percentage of Assets): 0.34%
Expenses (as a percentage of Assets) 2.07%
Fee Waiver or Reimbursement (0.00%) [6]
Net Expenses (as a percentage of Assets) 2.07%
Optimum International Fund | Institutional  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.73%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.34%
Expenses (as a percentage of Assets) 1.07%
Fee Waiver or Reimbursement (0.00%) [6]
Net Expenses (as a percentage of Assets) 1.07%
Optimum Fixed Income Fund  
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination July 30, 2027
Optimum Fixed Income Fund | A  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.50%
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.29%
Expenses (as a percentage of Assets) 1.04%
Fee Waiver or Reimbursement (0.00%) [7]
Net Expenses (as a percentage of Assets) 1.04%
Optimum Fixed Income Fund | C  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.50%
Distribution and Service (12b-1) Fees 1.00%
Other Expenses (as a percentage of Assets): 0.29%
Expenses (as a percentage of Assets) 1.79%
Fee Waiver or Reimbursement (0.00%) [7]
Net Expenses (as a percentage of Assets) 1.79%
Optimum Fixed Income Fund | Institutional  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.50%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.29%
Expenses (as a percentage of Assets) 0.79%
Fee Waiver or Reimbursement (0.00%) [7]
Net Expenses (as a percentage of Assets) 0.79%
Optimum Large Cap Value Fund  
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination July 30, 2027
Optimum Large Cap Value Fund | A  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.64%
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.28%
Expenses (as a percentage of Assets) 1.17%
Fee Waiver or Reimbursement (0.00%) [8]
Net Expenses (as a percentage of Assets) 1.17%
Optimum Large Cap Value Fund | C  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.64%
Distribution and Service (12b-1) Fees 1.00%
Other Expenses (as a percentage of Assets): 0.28%
Expenses (as a percentage of Assets) 1.92%
Fee Waiver or Reimbursement (0.00%) [8]
Net Expenses (as a percentage of Assets) 1.92%
Optimum Large Cap Value Fund | Institutional  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.64%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.28%
Expenses (as a percentage of Assets) 0.92%
Fee Waiver or Reimbursement (0.00%) [8]
Net Expenses (as a percentage of Assets) 0.92%
[1]
2 The Fund’s investment manager, Delaware Management Company (Manager), has contractually agreed to waive all or a portion of its investment advisory fees and/or pay/reimburse expenses (excluding any 12b-1 fees, acquired fund fees and expenses, taxes, interest, short sale dividend and interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) in order to prevent total annual fund operating expenses from exceeding 0.94% of the Fund’s average daily net assets from July 31, 2026 through July 30, 2027. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[2]
2 The Fund’s investment manager, Delaware Management Company (Manager), has contractually agreed to waive all or a portion of its investment advisory fees and/or pay/reimburse expenses (excluding any 12b-1 fees, acquired fund fees and expenses, taxes, interest, short sale dividend and interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) in order to prevent total annual fund operating expenses from exceeding 1.19% of the Fund’s average daily net assets, from July 31, 2026 through July 30, 2027. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[3]
2 Acquired fund fees and expenses sets forth the Fund’s pro rata portion of the cumulative expenses charged by the registered investment companies in which the Fund invested during the last fiscal year. The actual acquired fund fees and expenses will vary with changes in the allocations of the Fund’s assets. These expenses are not direct costs paid by Fund shareholders, and are not used to calculate the Fund’s NAV.
[4]
3 The Fund’s investment manager, Delaware Management Company (Manager), has contractually agreed to waive all or a portion of its investment advisory fees and/or pay/reimburse expenses (excluding any 12b-1 fees, acquired fund fees and expenses, taxes, interest, short sale dividend and interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) in order to prevent total annual fund operating expenses from exceeding 1.14% of the Fund’s average daily net assets, from July 31, 2026 through July 30, 2027. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[5]
4 The Total annual fund operating expenses ratio shown above does not correlate to the expense ratio shown in the Financial Highlights table because that ratio does not include the acquired fund fees and expenses.
[6]
2 The Fund’s investment manager, Delaware Management Company (Manager), has contractually agreed to waive all or a portion of its investment advisory fees and/or pay/reimburse expenses (excluding any 12b-1 fees, acquired fund fees and expenses, taxes, interest, short sale dividend and interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) in order to prevent total annual fund operating expenses from exceeding 1.08% of the Fund’s average daily net assets, from July 31, 2026 through July 30, 2027. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[7]
2 The Fund’s investment manager, Delaware Management Company (Manager), has contractually agreed to waive all or a portion of its investment advisory fees and/or pay/reimburse expenses (excluding any 12b-1 fees, acquired fund fees and expenses, taxes, interest, short sale dividend and interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) in order to prevent total annual fund operating expenses from exceeding 0.80% of the Fund’s average daily net assets from July 31, 2026 through July 30, 2027. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.
[8]
2 The Fund’s investment manager, Delaware Management Company (Manager), has contractually agreed to waive all or a portion of its investment advisory fees and/or pay/reimburse expenses (excluding any 12b-1 fees, acquired fund fees and expenses, taxes, interest, short sale dividend and interest expenses, brokerage fees, certain insurance costs, and nonroutine expenses or costs, including, but not limited to, those relating to reorganizations, litigation, conducting shareholder meetings, and liquidations) in order to prevent total annual fund operating expenses from exceeding 0.93% of the Fund’s average daily net assets from July 31, 2026 through July 30, 2027. These waivers and reimbursements may only be terminated by agreement of the Manager and the Fund.