v3.25.4
Performance Management
Sep. 30, 2025
Virtus KAR Capital Growth Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

The bar chart shows changes in the fund’s performance from year to year over a 10-year period. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance Past Does Not Indicate Future [Text] The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] The Russell 1000® Growth Index is a free float-adjusted market capitalization-weighted index of growth-oriented stocks of the 1,000 largest companies in the Russell universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.
Bar Chart Does Not Reflect Sales Loads [Text] Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart [Heading] Calendar year total returns for Class I Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

33.41%

Worst Quarter:

2022, Q2:

-28.63%

Performance Table Heading Average Annual Total Returns (for the periods ended 12/31/25)
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Explanation after Tax Higher In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance [Table]
Average Annual Total Returns - Virtus KAR Capital Growth Fund
12 Months Ended 60 Months Ended 95 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
FT Wilshire 5000 Index | Average Annual Return, Label [Optional Text] FT Wilshire 5000 Index        
FT Wilshire 5000 Index | Average Annual Return, Percent   17.13% 13.40% 13.20% 14.45%
FT Wilshire 5000 Index | Performance Inception Date       Jan. 30, 2018  
Russell 1000® Growth Index | Average Annual Return, Label [Optional Text] Russell 1000® Growth Index        
Russell 1000® Growth Index | Average Annual Return, Percent   18.56% 15.32% 17.34% 18.13%
Russell 1000® Growth Index | Performance Inception Date       Jan. 30, 2018  
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class A Shares | Average Annual Return, Percent   0.98% 4.06%   12.11%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class C Shares | Average Annual Return, Percent   5.99% 4.38%   11.84%
Class I Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class I Shares | Average Annual Return, Percent   7.06% 5.47%   12.93%
Class I Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions        
Class I Shares | After Taxes on Distributions | Average Annual Return, Percent   5.38% 3.04%   10.83%
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares        
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   5.35% 3.83%   10.20%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class R6 Shares | Average Annual Return, Percent   7.35% 5.74% 11.30%  
Class R6 Shares | Performance Inception Date       Jan. 30, 2018  
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]

The FT Wilshire 5000 Index is a broad-based free-float market capitalization-weighted index that aims to capture 100% of the U.S. investable market capitalization. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

The Russell 1000® Growth Index is a free float-adjusted market capitalization-weighted index of growth-oriented stocks of the 1,000 largest companies in the Russell universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.

Performance Availability Website Address [Text] virtus.com
Performance Availability Phone [Text] 800-243-1574
Virtus KAR Capital Growth Fund | Class I Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 33.41%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (28.63%)
Lowest Quarterly Return, Date Jun. 30, 2022
Virtus KAR Equity Income Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future. The current subadviser commenced providing services for the fund in September 2020 and therefore the returns shown in the table for periods prior to that date reflect the performance of other investment professionals.

The bar chart shows changes in the fund’s performance from year to year over a 10-year period. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance Past Does Not Indicate Future [Text] The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] the MSCI USA High Dividend Yield Index (net) to the Russell 1000® Value Index. The new benchmark is used by many of the fund’s peers and the subadviser believes it is a more suitable representation of the fund’s investment strategy. The Russell 1000® Value Index is a free float-adjusted market capitalization-weighted index of value-oriented stocks of the 1,000 largest companies in the Russell Universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.
Bar Chart Does Not Reflect Sales Loads [Text] Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart [Heading] Calendar year total returns for Class I Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

19.98%

Worst Quarter:

2020, Q1:

-21.32%

Performance Table Heading Average Annual Total Returns (for the periods ended 12/31/25)
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance [Table]
Average Annual Total Returns - Virtus KAR Equity Income Fund
12 Months Ended 60 Months Ended 95 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
FT Wilshire 5000 Index | Average Annual Return, Label [Optional Text] FT Wilshire 5000 Index        
FT Wilshire 5000 Index | Average Annual Return, Percent   17.13% 13.40% 13.20% 14.45%
FT Wilshire 5000 Index | Performance Inception Date       Jan. 30, 2018  
Russell 1000® Value Index | Average Annual Return, Label [Optional Text] Russell 1000® Value Index        
Russell 1000® Value Index | Average Annual Return, Percent   15.91% 11.33% 10.07% 10.53%
Russell 1000® Value Index | Performance Inception Date       Jan. 30, 2018  
MSCI USA High Dividend Yield Index (net) | Average Annual Return, Label [Optional Text] MSCI USA High Dividend Yield Index (net)        
MSCI USA High Dividend Yield Index (net) | Average Annual Return, Percent   10.98% 8.43% 6.91% 9.21%
MSCI USA High Dividend Yield Index (net) | Performance Inception Date       Jan. 30, 2018  
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class A Shares | Average Annual Return, Percent   7.22% 6.16%   9.00%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class C Shares | Average Annual Return, Percent   12.59% 6.55%   8.79%
Class I Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class I Shares | Average Annual Return, Percent   13.75% 7.63%   9.90%
Class I Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions        
Class I Shares | After Taxes on Distributions | Average Annual Return, Percent   11.99% 6.44%   7.81%
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares        
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   9.38% 5.85%   7.46%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class R6 Shares | Average Annual Return, Percent   13.86% 7.69% 7.91%  
Class R6 Shares | Performance Inception Date       Jan. 30, 2018  
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]

The FT Wilshire 5000 Index is a broad-based free-float market capitalization-weighted index that aims to capture 100% of the U.S. investable market capitalization. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

Effective April 28, 2025 the style-specific benchmark has been changed from the MSCI USA High Dividend Yield Index (net) to the Russell 1000® Value Index. The new benchmark is used by many of the fund’s peers and the subadviser believes it is a more suitable representation of the fund’s investment strategy. The Russell 1000® Value Index is a free float-adjusted market capitalization-weighted index of value-oriented stocks of the 1,000 largest companies in the Russell Universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.

Performance Availability Website Address [Text] virtus.com
Performance Availability Phone [Text] 800-243-1574
Virtus KAR Equity Income Fund | Class I Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 19.98%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (21.32%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus KAR Mid-Cap Core Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

The bar chart shows changes in the fund’s performance from year to year over a 10-year period. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance Past Does Not Indicate Future [Text] The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] The Russell Midcap® Index is a free float-adjusted market capitalization-weighted index of medium-capitalization stocks of U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.
Bar Chart Does Not Reflect Sales Loads [Text] Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart [Heading] Calendar year total returns for Class I Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

21.63%

Worst Quarter:

2020, Q1:

-18.19%

Performance Table Heading Average Annual Total Returns (for the periods ended 12/31/25)
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Explanation after Tax Higher In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance [Table]
Average Annual Total Returns - Virtus KAR Mid-Cap Core Fund
12 Months Ended 60 Months Ended 95 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
FT Wilshire 5000 Index | Average Annual Return, Label [Optional Text] FT Wilshire 5000 Index        
FT Wilshire 5000 Index | Average Annual Return, Percent   17.13% 13.40% 13.20% 14.45%
FT Wilshire 5000 Index | Performance Inception Date       Jan. 30, 2018  
Russell Midcap® Index | Average Annual Return, Label [Optional Text] Russell Midcap® Index        
Russell Midcap® Index | Average Annual Return, Percent   10.60% 8.67% 9.35% 11.01%
Russell Midcap® Index | Performance Inception Date       Jan. 30, 2018  
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class A Shares | Average Annual Return, Percent   (5.02%) 4.05%   10.24%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class C Shares | Average Annual Return, Percent   (0.25%) 4.45%   10.03%
Class I Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class I Shares | Average Annual Return, Percent   0.74% 5.50%   11.14%
Class I Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions        
Class I Shares | After Taxes on Distributions | Average Annual Return, Percent   (0.27%) 5.08%   10.86%
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares        
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   1.17% 4.28%   9.25%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class R6 Shares | Average Annual Return, Percent   0.82% 5.58% 8.84%  
Class R6 Shares | Performance Inception Date       Jan. 30, 2018  
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]

The FT Wilshire 5000 Index is a broad-based free-float market capitalization-weighted index that aims to capture 100% of the U.S. investable market capitalization. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

The Russell Midcap® Index is a free float-adjusted market capitalization-weighted index of medium-capitalization stocks of U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.

Performance Availability Website Address [Text] virtus.com
Performance Availability Phone [Text] 800-243-1574
Virtus KAR Mid-Cap Core Fund | Class I Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 21.63%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (18.19%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus KAR Mid-Cap Growth Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

The bar chart shows changes in the fund’s performance from year to year over a 10-year period. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance Past Does Not Indicate Future [Text] The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] The Russell Midcap® Growth Index is a free float-adjusted market capitalization-weighted index of medium-capitalization, growth-oriented stocks of U.S. companies. The index is calculated on a total-return basis with dividends reinvested. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is unmanaged and not available for direct investment.
Bar Chart Does Not Reflect Sales Loads [Text] Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart [Heading] Calendar year total returns for Class I Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

37.97%

Worst Quarter:

2022, Q2:

-25.76%

Performance Table Heading Average Annual Total Returns (for the periods ended 12/31/25)
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Explanation after Tax Higher In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance [Table]
Average Annual Total Returns - Virtus KAR Mid-Cap Growth Fund
12 Months Ended 60 Months Ended 95 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
FT Wilshire 5000 Index | Average Annual Return, Label [Optional Text] FT Wilshire 5000 Index        
FT Wilshire 5000 Index | Average Annual Return, Percent   17.13% 13.40% 13.20% 14.45%
FT Wilshire 5000 Index | Performance Inception Date       Jan. 30, 2018  
Russell Midcap® Growth Index | Average Annual Return, Label [Optional Text] Russell Midcap® Growth Index        
Russell Midcap® Growth Index | Average Annual Return, Percent   8.66% 6.65% 10.97% 12.49%
Russell Midcap® Growth Index | Performance Inception Date       Jan. 30, 2018  
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class A Shares | Average Annual Return, Percent   (8.77%) (4.24%)   10.73%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class C Shares | Average Annual Return, Percent   (4.21%) (3.90%)   10.50%
Class I Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class I Shares | Average Annual Return, Percent   (3.23%) (2.92%)   11.61%
Class I Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions        
Class I Shares | After Taxes on Distributions | Average Annual Return, Percent   (10.18%) (4.42%)   10.48%
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares        
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   3.06% (2.18%)   9.58%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class R6 Shares | Average Annual Return, Percent   (3.05%) (2.73%) 9.15%  
Class R6 Shares | Performance Inception Date       Jan. 30, 2018  
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]

The FT Wilshire 5000 Index is a broad-based free-float market capitalization-weighted index that aims to capture 100% of the U.S. investable market capitalization. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

The Russell Midcap® Growth Index is a free float-adjusted market capitalization-weighted index of medium-capitalization, growth-oriented stocks of U.S. companies. The index is calculated on a total-return basis with dividends reinvested. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.

Performance Availability Website Address [Text] virtus.com
Performance Availability Phone [Text] 800-243-1574
Virtus KAR Mid-Cap Growth Fund | Class I Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 37.97%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (25.76%)
Lowest Quarterly Return, Date Jun. 30, 2022
Virtus KAR Small-Cap Core Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

The bar chart shows changes in the fund’s performance from year to year over a 10-year period. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance Past Does Not Indicate Future [Text] The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] The Russell 2000® Index is a free float-adjusted market capitalization-weighted index of the 2,000 smallest companies in the Russell Universe, which comprises the 3,000 largest U.S. companies. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.
Bar Chart Does Not Reflect Sales Loads [Text] Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart [Heading] Calendar year total returns for Class I Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2019, Q1:

21.42%

Worst Quarter:

2020, Q1:

-18.28%

Performance Table Heading Average Annual Total Returns (for the periods ended 12/31/25)
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Explanation after Tax Higher In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance [Table]
Average Annual Total Returns - Virtus KAR Small-Cap Core Fund
12 Months Ended 60 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
FT Wilshire 5000 Index | Average Annual Return, Label [Optional Text] FT Wilshire 5000 Index      
FT Wilshire 5000 Index | Average Annual Return, Percent   17.13% 13.40% 14.45%
Russell 2000® Index | Average Annual Return, Label [Optional Text] Russell 2000® Index      
Russell 2000® Index | Average Annual Return, Percent   12.81% 6.09% 9.62%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   (8.16%) 7.74% 14.24%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class C Shares | Average Annual Return, Percent   (3.50%) 8.18% 14.06%
Class I Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class I Shares | Average Annual Return, Percent   (2.53%) 9.26% 15.20%
Class I Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Class I Shares | After Taxes on Distributions | Average Annual Return, Percent   (5.40%) 7.31% 13.60%
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares      
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   0.60% 7.12% 12.54%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class R6 Shares | Average Annual Return, Percent   (2.44%) 9.35% 15.30%
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]

The FT Wilshire 5000 Index is a broad-based free-float market capitalization-weighted index that aims to capture 100% of the U.S. investable market capitalization. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

The Russell 2000® Index is a free float-adjusted market capitalization-weighted index of the 2,000 smallest companies in the Russell Universe, which comprises the 3,000 largest U.S. companies. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.

Performance Availability Website Address [Text] virtus.com
Performance Availability Phone [Text] 800-243-1574
Virtus KAR Small-Cap Core Fund | Class I Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 21.42%
Highest Quarterly Return, Date Mar. 31, 2019
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (18.28%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus KAR Small-Cap Growth Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

The bar chart shows changes in the fund’s performance from year to year over a 10-year period. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance Past Does Not Indicate Future [Text] The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] The Russell 2000® Growth Index is a free float-adjusted market capitalization-weighted index of growth-oriented stocks of the smallest 2,000 companies in the Russell universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.
Bar Chart Does Not Reflect Sales Loads [Text] Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart [Heading] Calendar year total returns for Class I Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

34.45%

Worst Quarter:

2020, Q1:

-17.27%

Performance Table Heading Average Annual Total Returns (for the periods ended 12/31/25)
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Explanation after Tax Higher In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance [Table]
Average Annual Total Returns - Virtus KAR Small-Cap Growth Fund
12 Months Ended 60 Months Ended 95 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
FT Wilshire 5000 Index | Average Annual Return, Label [Optional Text] FT Wilshire 5000 Index        
FT Wilshire 5000 Index | Average Annual Return, Percent   17.13% 13.40% 13.20% 14.45%
FT Wilshire 5000 Index | Performance Inception Date       Jan. 30, 2018  
Russell 2000® Growth Index | Average Annual Return, Label [Optional Text] Russell 2000® Growth Index        
Russell 2000® Growth Index | Average Annual Return, Percent   13.01% 3.18% 7.37% 9.57%
Russell 2000® Growth Index | Performance Inception Date       Jan. 30, 2018  
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class A Shares | Average Annual Return, Percent   (27.15%) (7.07%)   9.83%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class C Shares | Average Annual Return, Percent   (23.54%) (6.70%)   9.64%
Class I Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class I Shares | Average Annual Return, Percent   (22.74%) (5.77%)   10.73%
Class I Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions        
Class I Shares | After Taxes on Distributions | Average Annual Return, Percent   (28.68%) (9.11%)   8.35%
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares        
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   (9.18%) (4.00%)   9.12%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class R6 Shares | Average Annual Return, Percent   (22.64%) (5.67%) 5.50%  
Class R6 Shares | Performance Inception Date       Jan. 30, 2018  
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]

The FT Wilshire 5000 Index is a broad-based free-float market capitalization-weighted index that aims to capture 100% of the U.S. investable market capitalization. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

The Russell 2000® Growth Index is a free float-adjusted market capitalization-weighted index of growth-oriented stocks of the smallest 2,000 companies in the Russell universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.

Performance Availability Website Address [Text] virtus.com
Performance Availability Phone [Text] 800-243-1574
Virtus KAR Small-Cap Growth Fund | Class I Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 34.45%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (17.27%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus KAR Small-Cap Value Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

The bar chart shows changes in the fund’s performance from year to year over a 10-year period. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance Past Does Not Indicate Future [Text] The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] The Russell 2000® Value Index is a free float-adjusted market capitalization-weighted index of value-oriented stocks of the smallest 2,000 companies in the Russell universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.
Bar Chart Does Not Reflect Sales Loads [Text] Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart [Heading] Calendar year total returns for Class I Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

28.47%

Worst Quarter:

2020, Q1:

-22.08%

Performance Table Heading Average Annual Total Returns (for the periods ended 12/31/25)
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Explanation after Tax Higher In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance [Table]
Average Annual Total Returns - Virtus KAR Small-Cap Value Fund
12 Months Ended 60 Months Ended 110 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
FT Wilshire 5000 Index | Average Annual Return, Label [Optional Text] FT Wilshire 5000 Index        
FT Wilshire 5000 Index | Average Annual Return, Percent   17.13% 13.40% 15.34% 14.45%
FT Wilshire 5000 Index | Performance Inception Date       Nov. 03, 2016  
Russell 2000® Value Index | Average Annual Return, Label [Optional Text] Russell 2000® Value Index        
Russell 2000® Value Index | Average Annual Return, Percent   12.59% 8.88% 9.13% 9.27%
Russell 2000® Value Index | Performance Inception Date       Nov. 03, 2016  
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class A Shares | Average Annual Return, Percent   (9.92%) 1.09%   7.57%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class C Shares | Average Annual Return, Percent   (5.46%) 1.45%   7.36%
Class I Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class I Shares | Average Annual Return, Percent   (4.48%) 2.47%   8.45%
Class I Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions        
Class I Shares | After Taxes on Distributions | Average Annual Return, Percent   (5.71%) 1.58%   7.50%
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares        
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   (1.75%) 1.88%   6.73%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class R6 Shares | Average Annual Return, Percent   (4.40%) 2.56% 8.53%  
Class R6 Shares | Performance Inception Date       Nov. 03, 2016  
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]

The FT Wilshire 5000 Index is a broad-based free-float market capitalization-weighted index that aims to capture 100% of the U.S. investable market capitalization. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

The Russell 2000® Value Index is a free float-adjusted market capitalization-weighted index of value-oriented stocks of the smallest 2,000 companies in the Russell universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.

Performance Availability Website Address [Text] virtus.com
Performance Availability Phone [Text] 800-243-1574
Virtus KAR Small-Cap Value Fund | Class I Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 28.47%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (22.08%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus KAR Small-Mid Cap Core Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

The bar chart shows changes in the fund’s performance from year to year over the life of the fund. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance Past Does Not Indicate Future [Text] The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] The Russell 2500TM Index is a free float-adjusted market capitalization-weighted index of the 2,500 smallest companies in the Russell Universe, which comprises the 3,000 largest U.S. companies. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.
Bar Chart Does Not Reflect Sales Loads [Text] Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart [Heading] Calendar year total returns for Class I Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

28.26%

Worst Quarter:

2022, Q2:

-17.20%

Performance Table Heading Average Annual Total Returns (for the periods ended 12/31/25)
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Explanation after Tax Higher In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance [Table]
Average Annual Total Returns - Virtus KAR Small-Mid Cap Core Fund
12 Months Ended 60 Months Ended 94 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
FT Wilshire 5000 Index | Average Annual Return, Label [Optional Text] FT Wilshire 5000 Index      
FT Wilshire 5000 Index | Average Annual Return, Percent   17.13% 13.40% 13.79%
FT Wilshire 5000 Index | Performance Inception Date       Mar. 07, 2018
Russell 2500™ Index | Average Annual Return, Label [Optional Text] Russell 2500™ Index      
Russell 2500™ Index | Average Annual Return, Percent   11.91% 7.26% 8.69%
Russell 2500™ Index | Performance Inception Date       Mar. 07, 2018
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   (9.83%) 1.83% 8.21%
Class A Shares | Performance Inception Date       Mar. 07, 2018
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class C Shares | Average Annual Return, Percent   (5.30%) 2.22% 8.18%
Class C Shares | Performance Inception Date       Mar. 07, 2018
Class I Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class I Shares | Average Annual Return, Percent   (4.36%) 3.26% 9.27%
Class I Shares | Performance Inception Date       Mar. 07, 2018
Class I Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Class I Shares | After Taxes on Distributions | Average Annual Return, Percent   (4.43%) 3.17% 9.14%
Class I Shares | After Taxes on Distributions | Performance Inception Date       Mar. 07, 2018
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares      
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   (2.52%) 2.52% 7.48%
Class I Shares | After Taxes on Distributions and Sales | Performance Inception Date       Mar. 07, 2018
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class R6 Shares | Average Annual Return, Percent   (4.29%) 3.34% 9.36%
Class R6 Shares | Performance Inception Date       Mar. 07, 2018
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]

The FT Wilshire 5000 Index is a broad-based free-float market capitalization-weighted index that aims to capture 100% of the U.S. investable market capitalization. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

The Russell 2500TM Index is a free float-adjusted market capitalization-weighted index of the 2,500 smallest companies in the Russell Universe, which comprises the 3,000 largest U.S. companies. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.

Performance Availability Website Address [Text] virtus.com
Performance Availability Phone [Text] 800-243-1574
Virtus KAR Small-Mid Cap Core Fund | Class I Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 28.26%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (17.20%)
Lowest Quarterly Return, Date Jun. 30, 2022
Virtus KAR Small-Mid Cap Growth Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

The bar chart shows changes in the fund’s performance from year to year over the life of the fund. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance Past Does Not Indicate Future [Text] The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] The Russell 2500TM Growth Index is a free float-adjusted market capitalization-weighted index of growth oriented stocks of the 2,500 smallest companies in the Russell Universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.
Bar Chart Does Not Reflect Sales Loads [Text] Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart [Heading] Calendar year total returns for Class I Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2021, Q2:

9.59%

Worst Quarter:

2022, Q2:

-18.24%

Performance Table Heading Average Annual Total Returns (for the periods ended 12/31/25)
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Explanation after Tax Higher In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance [Table]
Average Annual Total Returns - Virtus KAR Small-Mid Cap Growth Fund
12 Months Ended 60 Months Ended 61 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
FT Wilshire 5000 Index | Average Annual Return, Label [Optional Text] FT Wilshire 5000 Index      
FT Wilshire 5000 Index | Average Annual Return, Percent   17.13% 13.40% 13.59%
FT Wilshire 5000 Index | Performance Inception Date       Dec. 08, 2020
Russell 2500™ Growth Index | Average Annual Return, Label [Optional Text] Russell 2500™ Growth Index      
Russell 2500™ Growth Index | Average Annual Return, Percent   10.31% 2.98% 3.82%
Russell 2500™ Growth Index | Performance Inception Date       Dec. 08, 2020
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   (13.55%) (1.36%) (0.92%)
Class A Shares | Performance Inception Date       Dec. 08, 2020
Class I Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class I Shares | Average Annual Return, Percent   (8.33%) 0.00% 0.45%
Class I Shares | Performance Inception Date       Dec. 08, 2020
Class I Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Class I Shares | After Taxes on Distributions | Average Annual Return, Percent   (8.33%) 0.00% 0.45%
Class I Shares | After Taxes on Distributions | Performance Inception Date       Dec. 08, 2020
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares      
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   (4.93%) 0.00% 0.34%
Class I Shares | After Taxes on Distributions and Sales | Performance Inception Date       Dec. 08, 2020
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class R6 Shares | Average Annual Return, Percent   (8.23%) 0.06% 0.51%
Class R6 Shares | Performance Inception Date       Dec. 08, 2020
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]

The FT Wilshire 5000 Index is a broad-based free-float market capitalization-weighted index that aims to capture 100% of the U.S. investable market capitalization. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

The Russell 2500TM Growth Index is a free float-adjusted market capitalization-weighted index of growth oriented stocks of the 2,500 smallest companies in the Russell Universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.

Performance Availability Website Address [Text] virtus.com
Performance Availability Phone [Text] 800-243-1574
Virtus KAR Small-Mid Cap Growth Fund | Class I Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 9.59%
Highest Quarterly Return, Date Jun. 30, 2021
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (18.24%)
Lowest Quarterly Return, Date Jun. 30, 2022
Virtus KAR Small-Mid Cap Value Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

The bar chart shows changes in the fund’s performance from year to year over the life of the fund. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance Past Does Not Indicate Future [Text] The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] The Russell 2500TM Value Index is a free float-adjusted market capitalization-weighted index of value-oriented stocks of the 2,500 smallest companies in the Russell Universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.
Bar Chart Does Not Reflect Sales Loads [Text] Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart [Heading] Calendar year total returns for Class I Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2023, Q4:

12.42%

Worst Quarter:

2022, Q1:

-11.90%

Performance Table Heading Average Annual Total Returns (for the periods ended 12/31/25)
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance [Table]
Average Annual Total Returns - Virtus KAR Small-Mid Cap Value Fund
12 Months Ended 53 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
FT Wilshire 5000 Index | Average Annual Return, Label [Optional Text] FT Wilshire 5000 Index    
FT Wilshire 5000 Index | Average Annual Return, Percent   17.13% 11.02%
FT Wilshire 5000 Index | Performance Inception Date     Aug. 03, 2021
Russell 2500® Value Index | Average Annual Return, Label [Optional Text] Russell 2500® Value Index    
Russell 2500® Value Index | Average Annual Return, Percent   12.73% 6.70%
Russell 2500® Value Index | Performance Inception Date     Aug. 03, 2021
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes    
Class A Shares | Average Annual Return, Percent   (9.13%) (0.90%)
Class A Shares | Performance Inception Date     Aug. 03, 2021
Class I Shares | Average Annual Return, Label [Optional Text] Return Before Taxes    
Class I Shares | Average Annual Return, Percent   (3.61%) 0.62%
Class I Shares | Performance Inception Date     Aug. 03, 2021
Class I Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions    
Class I Shares | After Taxes on Distributions | Average Annual Return, Percent   (3.67%) 0.49%
Class I Shares | After Taxes on Distributions | Performance Inception Date     Aug. 03, 2021
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares    
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   (2.10%) 0.47%
Class I Shares | After Taxes on Distributions and Sales | Performance Inception Date     Aug. 03, 2021
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes    
Class R6 Shares | Average Annual Return, Percent   (3.56%) 0.70%
Class R6 Shares | Performance Inception Date     Aug. 03, 2021
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]

The FT Wilshire 5000 Index is a broad-based free-float market capitalization-weighted index that aims to capture 100% of the U.S. investable market capitalization. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

The Russell 2500TM Value Index is a free float-adjusted market capitalization-weighted index of value-oriented stocks of the 2,500 smallest companies in the Russell Universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.

Performance Availability Website Address [Text] virtus.com
Performance Availability Phone [Text] 800-243-1574
Virtus KAR Small-Mid Cap Value Fund | Class I Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 12.42%
Highest Quarterly Return, Date Dec. 31, 2023
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (11.90%)
Lowest Quarterly Return, Date Mar. 31, 2022
Virtus SGA Global Growth Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]

The fund is the successor of American Beacon SGA Global Growth Fund, a series of American Beacon Funds (“Predecessor Fund”), resulting from a reorganization of the Predecessor Fund with and into the fund, which occurred on May 3, 2019. The fund has adopted the past performance of the Predecessor Fund as its own.

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

The bar chart shows changes in the fund's and Predecessor Fund’s performance from year to year over a 10-year period. The table shows how the fund's and Predecessor Fund’s average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance Past Does Not Indicate Future [Text] The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The fund is the successor of American Beacon SGA Global Growth Fund, a series of American Beacon Funds (“Predecessor Fund”), resulting from a reorganization of the Predecessor Fund with and into the fund, which occurred on May 3, 2019. The fund has adopted the past performance of the Predecessor Fund as its own. The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] The MSCI All Country World Index (net) is a free float-adjusted market capitalization-weighted index that measures equity performance of developed and emerging markets. The MSCI All Country World Index (net) is calculated on a total return basis with net dividends reinvested. The index is unmanaged and not available for direct investment.
Bar Chart Does Not Reflect Sales Loads [Text] Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart [Heading] Calendar year total returns for Class I Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

25.43%

Worst Quarter:

2022, Q2:

-19.33%

Performance Table Heading Average Annual Total Returns (for the periods ended 12/31/25; includes returns of the Predecessor Fund)
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Explanation after Tax Higher In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance [Table]
Average Annual Total Returns - Virtus SGA Global Growth Fund
12 Months Ended 60 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI All Country World Index (net) | Average Annual Return, Label [Optional Text] MSCI All Country World Index (net)      
MSCI All Country World Index (net) | Average Annual Return, Percent   22.34% 11.19% 11.72%
MSCI All Country World Growth Index (net) | Average Annual Return, Label [Optional Text] MSCI All Country World Growth Index (net)      
MSCI All Country World Growth Index (net) | Average Annual Return, Percent   22.44% 11.12% 13.99%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   (2.31%) 1.65% 9.63%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class C Shares | Average Annual Return, Percent   2.63% 2.04% 9.43%
Class I Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class I Shares | Average Annual Return, Percent   3.71% 3.07% 10.44%
Class I Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Class I Shares | After Taxes on Distributions | Average Annual Return, Percent   0.38% 0.83% 8.79%
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares      
Class I Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   3.91% 2.15% 8.31%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class R6 Shares | Average Annual Return, Percent   3.78% 3.25% 10.72%
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees or expenses)
Performance Table Closing [Text Block]

The MSCI All Country World Index (net) is a free float-adjusted market capitalization-weighted index that measures equity performance of developed and emerging markets. The MSCI All Country World Index (net) is calculated on a total return basis with net dividends reinvested. The index is unmanaged and not available for direct investment.

The MSCI All Country World Growth Index (net) is designed to measure the equity market performance of companies with higher growth values in developed and emerging markets. The MSCI All Country World Growth Index (net) is calculated on a total return basis with net dividends reinvested. The index is unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.

Performance Availability Website Address [Text] virtus.com
Performance Availability Phone [Text] 800-243-1574
Virtus SGA Global Growth Fund | Class I Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 25.43%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (19.33%)
Lowest Quarterly Return, Date Jun. 30, 2022
VIRTUS TACTICAL ALLOCATION FUND  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance Information
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

The bar chart shows changes in the fund’s performance from year to year over a 10-year period. The table shows how the fund’s average annual returns compare to those of two broad-based securities market indices (the Bloomberg U.S. Aggregate Bond Index and the MSCI ACWI World Index (net)), two style-specific indexes that reflect the market sectors in which the fund invests (the MSCI ACWI ex USA SMID Cap Index (net) and the the Russell 1000® Growth Index) and a composite benchmark that reflects a hypothetical asset allocation among market sectors for the Fund. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance Past Does Not Indicate Future [Text] The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] The Bloomberg U.S. Aggregate Bond Index measures the U.S. investment grade fixed rate bond market. The index is calculated on a total return basis. The index is unmanaged and not available for direct investment.
Bar Chart Does Not Reflect Sales Loads [Text] Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart [Heading] Calendar year total returns for Class A Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

22.60%

Worst Quarter:

2022, Q2:

-19.62%

Performance Table Heading Average Annual Total Returns (for the periods ended 12/31/25)
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class A Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance Table Not Relevant to Tax Deferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Explanation after Tax Higher In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Performance [Table]
Average Annual Total Returns - VIRTUS TACTICAL ALLOCATION FUND
12 Months Ended 60 Months Ended 62 Months Ended 83 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 1000® Growth Index | Average Annual Return, Label [Optional Text] Russell 1000® Growth Index          
Russell 1000® Growth Index | Average Annual Return, Percent   18.56% 15.32%   20.58% 18.13%
Russell 1000® Growth Index | Performance Inception Date         Jan. 29, 2019  
MSCI All Country World Index (net) | Average Annual Return, Label [Optional Text] MSCI All Country World Index (net)          
MSCI All Country World Index (net) | Average Annual Return, Percent   22.34% 11.19%   13.23% 11.72%
MSCI All Country World Index (net) | Performance Inception Date         Jan. 29, 2019  
Bloomberg U.S. Aggregate Bond Index | Average Annual Return, Label [Optional Text] Bloomberg U.S. Aggregate Bond Index          
Bloomberg U.S. Aggregate Bond Index | Average Annual Return, Percent   7.30% (0.36%)   1.93% 2.01%
Bloomberg U.S. Aggregate Bond Index | Performance Inception Date         Jan. 29, 2019  
Bloomberg U.S. Aggregate Bond Index | Average Annual Return, Percent       (0.17%)    
Bloomberg U.S. Aggregate Bond Index | Performance Inception Date       Oct. 20, 2020    
MSCI All Country World Index (net) | Average Annual Return, Percent       13.12%    
MSCI All Country World Index (net) | Performance Inception Date       Oct. 20, 2020    
MSCI All Country World ex USA SMID Cap Index (net) | Average Annual Return, Label [Optional Text] MSCI All Country World ex USA SMID Cap Index (net)          
MSCI All Country World ex USA SMID Cap Index (net) | Average Annual Return, Percent   30.74% 6.80%   8.71% 7.87%
MSCI All Country World ex USA SMID Cap Index (net) | Performance Inception Date         Jan. 29, 2019  
MSCI All Country World ex USA SMID Cap Index (net) | Average Annual Return, Percent       9.36%    
MSCI All Country World ex USA SMID Cap Index (net) | Performance Inception Date       Oct. 20, 2020    
Russell 1000® Growth Index | Average Annual Return, Percent       16.55%    
Russell 1000® Growth Index | Performance Inception Date       Oct. 20, 2020    
Virtus Tactical Allocation Fund Linked Benchmark | Average Annual Return, Label [Optional Text] Virtus Tactical Allocation Fund Linked Benchmark          
Virtus Tactical Allocation Fund Linked Benchmark | Average Annual Return, Percent   15.98% 7.88%   11.51% 10.39%
Virtus Tactical Allocation Fund Linked Benchmark | Performance Inception Date         Jan. 29, 2019  
Virtus Tactical Allocation Fund Linked Benchmark | Average Annual Return, Percent       8.88%    
Virtus Tactical Allocation Fund Linked Benchmark | Performance Inception Date       Oct. 20, 2020    
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes          
Class A Shares | Average Annual Return, Percent   0.86% 1.49%     7.51%
Class A Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions          
Class A Shares | After Taxes on Distributions | Average Annual Return, Percent   (2.76%) (0.77%)     5.68%
Class A Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares          
Class A Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   2.58% 0.76%     5.60%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes          
Class C Shares | Average Annual Return, Percent   5.94% 1.86%     7.30%
Class I Shares | Average Annual Return, Label [Optional Text] Return Before Taxes          
Class I Shares | Average Annual Return, Percent   7.00% 2.89%   9.22%  
Class I Shares | Performance Inception Date         Jan. 29, 2019  
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes          
Class R6 Shares | Average Annual Return, Percent   7.09% 3.05% 4.34%    
Class R6 Shares | Performance Inception Date       Oct. 20, 2020    
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Class A Shares; after-tax returns for other classes will vary.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block]

The Bloomberg U.S. Aggregate Bond Index measures the U.S. investment grade fixed rate bond market. The index is calculated on a total return basis. The index is unmanaged and not available for direct investment.

The MSCI All Country World Index (net) is a free float-adjusted market capitalization-weighted index that measures equity performance of developed and emerging markets. The MSCI All Country World Index (net) is calculated on a total return basis with net dividends reinvested. The index is unmanaged and not available for direct investment.

The MSCI All Country World ex USA SMID Cap Index (net) is a free float-adjusted market capitalization-weighted index that measures mid- and small-cap performance across 22 of 23 Developed Market countries (excluding the U.S.) and 24 Emerging Markets countries. The index is calculated on a total return basis with net dividends reinvested. The index is unmanaged and not available for direct investment.

The Russell 1000® Growth Index is a free float-adjusted market capitalization-weighted index of growth-oriented stocks of the 1,000 largest companies in the Russell universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

Effective June 4, 2019, the Virtus Tactical Allocation Fund Linked Benchmark consists of 45% Russell 1000® Growth Index, 15% MSCI All Country World ex USA SMID Cap Index, and 40% Bloomberg U.S. Aggregate Bond Index. From September 7, 2016 to June 3, 2019, the Virtus Tactical Allocation Fund Linked Benchmark consists of 45% Russell 1000® Growth Index, 15% MSCI EAFE® Index, and 40% Bloomberg U.S. Aggregate Bond Index. Performance of the Virtus Tactical Allocation Fund Linked Benchmark prior to September 7, 2016 represents an allocation consisting of 50% S&P 500® Index and 50% Bloomberg U.S. Aggregate Bond Index. The indexes are unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class A Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.

Performance Availability Website Address [Text] virtus.com
Performance Availability Phone [Text] 800-243-1574
VIRTUS TACTICAL ALLOCATION FUND | Class A Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 22.60%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (19.62%)
Lowest Quarterly Return, Date Jun. 30, 2022