Fees and Expenses - The Merger Fund

Dec. 31, 2025

USD ($)

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

The tables below illustrate the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts in Class A Shares if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Funds. More information on these and other discounts is available: (i) from your financial professional or other financial intermediary; (ii) under “Sales Charges” on page 41 of the fund’s prospectus; and (iii) with respect to purchase of shares through specific intermediaries, in Appendix A to the fund’s prospectus, entitled “Intermediary Sales Charge Discounts and Waivers.”

Expense Breakpoint Discounts [Text]

You may qualify for sales charge discounts in Class A Shares if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Shareholder Fees Caption [Optional Text]

 Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]

Shareholder Fees - The Merger Fund	Class A Shares	Class I Shares
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	5.50%	0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price)	0.00%	0.00%

Operating Expenses Caption [Optional Text]

 Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses - The Merger Fund		Class A Shares	Class I Shares
Management Fees (as a percentage of Assets)		1.00%	1.00%
Distribution and Service (12b-1) Fees		0.25%	0.00%
Component1 Other Expenses		0.01%	0.01%
Component3 Other Expenses		0.31%	0.27%
Other Expenses (as a percentage of Assets):	[1]	0.32%	0.28%
Acquired Fund Fees and Expenses		0.08%	0.08%
Expenses (as a percentage of Assets)	[2]	1.65%	1.36%
Fee Waiver or Reimbursement	[3]	(0.10%)	(0.10%)
Net Expenses (as a percentage of Assets)	[2],[3]	1.55%	1.26%

Expense Example [Heading]

Example

Expense Example Narrative [Text Block]

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods or continued to hold them. The example also assumes that your investment has a 5% return each year, that the fund’s operating expenses remain the same and that the expense reimbursement agreement remains in place for the contractual period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example by, Year, Caption [Text]

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, With Redemption [Table]

Expense Example - The Merger Fund - USD ($)	Class A Shares	Class I Shares
Expense Example, with Redemption, 1 Year	$ 699	$ 128
Expense Example, with Redemption, 3 Years	1,033	421
Expense Example, with Redemption, 5 Years	1,389	735
Expense Example, with Redemption, 10 Years	$ 2,389	$ 1,626

Expense Example, No Redemption [Table]

Expense Example, No Redemption - The Merger Fund - USD ($)	Class A Shares	Class I Shares
Expense Example, No Redemption, 1 Year	$ 699	$ 128
Expense Example, No Redemption, 3 Years	1,033	421
Expense Example, No Redemption, 5 Years	1,389	735
Expense Example, No Redemption, 10 Years	$ 2,389	$ 1,626

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 149% of the average value of its portfolio.

Portfolio Turnover, Rate

149.00%

[1] Not included in the table are extraordinary expenses. If such amounts were reflected in this table, Total Other Expenses would have been 0.33% for Class A Shares and 0.29% for Class I Shares.

[2] The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets appearing in the Financial Highlights tables, which tables reflect only the operating expenses of the fund and do not include acquired fund fees and expenses.

[3] The fund’s investment adviser has contractually agreed to limit the fund’s total operating expenses (excluding certain expenses, such as front-end or contingent deferred sales charges, taxes, leverage and borrowing expenses (such as commitment, amendment and renewal expenses on credit or redemption facilities), interest, brokerage commissions, expenses incurred in connection with any merger or reorganization, unusual or infrequently occurring expenses (such as litigation), acquired fund fees and expenses, and dividend expenses, if any) so that such expenses do not exceed 1.46% for Class A Shares and 1.17% for Class I Shares through April 30, 2027. Prior to April 30, 2027, only the fund’s Board may modify or terminate the expense limitation agreement. Following the contractual period, the adviser may discontinue these expense reimbursement arrangements at any time. Under certain conditions, the adviser may recapture operating expenses reimbursed and/or fees waived under these arrangements for a period of three years following the date such waiver or reimbursement occurred, provided that the recapture does not cause the fund to exceed its expense limit in effect at the time of the waiver or reimbursement, and any in effect at the time of recapture, after repayment is taken into account.