v3.25.4
Performance Management
Sep. 30, 2025
Virtus Convertible 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] ICE BofA US Convertibles Index (reflects no deduction for fees, expenses or taxes) 17.98% 5.05% 11.22% 6.66%      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 Institutional Class Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

26.25%

Worst Quarter:

2022, Q2:

-15.22%

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 Institutional Class 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 Convertible Fund
12 Months Ended 47 Months Ended 60 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
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% 0.49% (0.36%) 2.01%
Bloomberg U.S. Aggregate Bond Index | Performance Inception Date     Jan. 31, 2022    
ICE BofA US Convertibles Index | Average Annual Return, Label [Optional Text] ICE BofA US Convertibles Index        
ICE BofA US Convertibles Index | Average Annual Return, Percent   17.98% 6.66% 5.05% 11.22%
ICE BofA US Convertibles Index | Performance Inception Date     Jan. 31, 2022    
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class A Shares | Average Annual Return, Percent   15.33%   3.83% 11.40%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class C Shares | Average Annual Return, Percent   21.12%   4.26% 11.22%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Institutional Class Shares | Average Annual Return, Percent   22.37%   5.33% 12.37%
Institutional Class Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions        
Institutional Class Shares | After Taxes on Distributions | Average Annual Return, Percent   18.31%   2.89% 9.21%
Institutional Class Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares        
Institutional Class Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   14.32%   3.26% 8.69%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class R6 Shares | Average Annual Return, Percent   22.46% 7.84%    
Class R6 Shares | Performance Inception Date     Jan. 31, 2022    
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Institutional Class 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 ICE BofA US Convertibles Index tracks the performance of publicly issued US dollar denominated convertible securities of U.S. companies. The index is calculated on a total return basis. The index is unmanaged and is 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 Institutional Class 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 Convertible Fund | Institutional Class Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 26.25%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (15.22%)
Lowest Quarterly Return, Date Jun. 30, 2022
Virtus Duff & Phelps Water 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 July 2022 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 more narrowly based 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 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 Institutional Class Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2023, Q4:

14.07%

Worst Quarter:

2020, Q1:

-17.12%

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 Institutional Class 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 Duff & Phelps Water 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%
S&P Global Water Index (net) | Average Annual Return, Label [Optional Text] S&P Global Water Index (net)      
S&P Global Water Index (net) | Average Annual Return, Percent   18.25% 8.13% 10.90%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   5.80% 4.38% 7.98%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class C Shares | Average Annual Return, Percent   11.19% 4.79% 7.78%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   12.31% 5.87% 8.90%
Institutional Class Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Institutional Class Shares | After Taxes on Distributions | Average Annual Return, Percent   9.31% 4.30% 7.62%
Institutional Class Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares      
Institutional Class Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   9.43% 4.50% 7.02%
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Institutional Class 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 S&P Global Water Index (net) is a modified capitalization-weighted index comprised of 50 of the largest publicly traded companies in water-related businesses that meet specific invest ability requirements. The index is designed to provide liquid exposure to the leading publicly-listed companies in the global water industry, from both developed markets and emerging markets. The index is calculated on a total return basis. 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 Institutional Class 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 Duff & Phelps Water Fund | Institutional Class Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 14.07%
Highest Quarterly Return, Date Dec. 31, 2023
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (17.12%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus Global 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 indexes and a composite benchmark 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 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 Institutional Class Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

13.26%

Worst Quarter:

2020, Q1:

-12.48%

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 Institutional Class 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 Global Allocation Fund
12 Months Ended 60 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
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%) 2.01%
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%
60% MSCI All Country World Index (net) / 40% Bloomberg U.S. Aggregate Bond Index | Average Annual Return, Label [Optional Text] 60% MSCI All Country World Index (net) / 40% Bloomberg U.S. Aggregate Bond Index      
60% MSCI All Country World Index (net) / 40% Bloomberg U.S. Aggregate Bond Index | Average Annual Return, Percent   16.22% 6.57% 7.96%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   11.21% 4.34% 6.26%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   17.91% 5.78% 7.10%
Institutional Class Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Institutional Class Shares | After Taxes on Distributions | Average Annual Return, Percent   15.37% 3.93% 4.98%
Institutional Class Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares      
Institutional Class Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   11.37% 3.90% 4.85%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class R6 Shares | Average Annual Return, Percent   17.95% 5.83% 7.18%
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Institutional Class 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.

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 Institutional Class 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 Global Allocation Fund | Institutional Class Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 13.26%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (12.48%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus International Small-Cap 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 indexes. 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 All Country World ex USA Index (net) is a free float-adjusted market capitalization-weighted index that measures equity performance of developed and emerging markets, excluding the United States. The index 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 Institutional Class Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

22.14%

Worst Quarter:

2020, Q1:

-24.76%

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 Institutional Class 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 International Small-Cap Fund
12 Months Ended 60 Months Ended 119 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI All Country World ex USA Index (net) | Average Annual Return, Label [Optional Text] MSCI All Country World ex USA Index (net)        
MSCI All Country World ex USA Index (net) | Average Annual Return, Percent   32.39% 7.91% 9.19% 8.41%
MSCI All Country World ex USA Index (net) | Performance Inception Date       Feb. 01, 2016  
MSCI All Country World ex USA Small Cap Index (net) | Average Annual Return, Label [Optional Text] MSCI All Country World ex USA Small Cap Index (net)        
MSCI All Country World ex USA Small Cap Index (net) | Average Annual Return, Percent   29.26% 6.91% 8.96% 8.13%
MSCI All Country World ex USA Small Cap Index (net) | Performance Inception Date       Feb. 01, 2016  
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class A Shares | Average Annual Return, Percent   28.50% 3.92%   5.61%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Institutional Class Shares | Average Annual Return, Percent   36.28% 5.32%   6.43%
Institutional Class Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions        
Institutional Class Shares | After Taxes on Distributions | Average Annual Return, Percent   35.04% 4.31%   5.23%
Institutional Class Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares        
Institutional Class Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   22.66% 4.39%   4.99%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class R6 Shares | Average Annual Return, Percent   36.37% 5.37% 7.37%  
Class R6 Shares | Performance Inception Date       Feb. 01, 2016  
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Institutional Class 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 ex USA Index (net) is a free float-adjusted market capitalization-weighted index that measures equity performance of developed and emerging markets, excluding the United States. The index 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 Small 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.

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 Institutional Class 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 International Small-Cap Fund | Institutional Class Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 22.14%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (24.76%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus Newfleet Short Duration High 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 July 2022 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] ICE BofA 1-3Y BB US Cash Pay High Yield Index (reflects no deduction for fees, expenses or taxes) 7.22% 4.50% 4.99% 4.60%      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 Institutional Class Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

9.80%

Worst Quarter:

2020, Q1:

-11.95%

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 Institutional Class 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 Newfleet Short Duration High Income Fund
12 Months Ended 60 Months Ended 107 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
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%) 1.95% 2.01%
Bloomberg U.S. Aggregate Bond Index | Performance Inception Date       Feb. 01, 2017  
ICE BofA 1-3Y BB US Cash Pay High Yield Index | Average Annual Return, Label [Optional Text] ICE BofA 1-3Y BB US Cash Pay High Yield Index        
ICE BofA 1-3Y BB US Cash Pay High Yield Index | Average Annual Return, Percent   7.22% 4.50% 4.60% 4.99%
ICE BofA 1-3Y BB US Cash Pay High Yield Index | Performance Inception Date       Feb. 01, 2017  
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class A Shares | Average Annual Return, Percent   3.85% 4.46%   4.86%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class C Shares | Average Annual Return, Percent   6.02% 4.69%   4.84%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Institutional Class Shares | Average Annual Return, Percent   6.59% 5.21%   5.39%
Institutional Class Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions        
Institutional Class Shares | After Taxes on Distributions | Average Annual Return, Percent   3.73% 2.47%   2.84%
Institutional Class Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares        
Institutional Class Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   3.85% 2.74%   2.97%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class R6 Shares | Average Annual Return, Percent   6.57% 5.25% 4.85%  
Class R6 Shares | Performance Inception Date       Feb. 01, 2017  
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Institutional Class 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 ICE BofA 1-3 Year BB U.S. Cash Pay High Yield Index is a subset of The ICE BofA U.S. Cash Pay High Yield Index including all securities with a remaining term to final maturity less than 3 years and rated BB1 through BB3, inclusive. The ICE BofA U.S. Cash Pay High Yield Index tracks the performance of U.S. dollar denominated below investment grade corporate debt, currently in a coupon paying period, that is publicly issued in the U.S. domestic market.

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 Institutional Class 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 Newfleet Short Duration High Income Fund | Institutional Class Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 9.80%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (11.95%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus NFJ Emerging Markets 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. 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 Emerging Markets Index (net) is a free float-adjusted market capitalization-weighted index designed to measure equity market performance in the global emerging markets. The index 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 Institutional Class Shares 
Bar Chart Closing [Text Block]
      

Best Quarter:

2020, Q2:

21.65%

Worst Quarter:

2020, Q1:

-21.20%

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 Institutional Class 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 NFJ Emerging Markets Value Fund
12 Months Ended 60 Months Ended 120 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI Emerging Markets Index (net) | Average Annual Return, Label [Optional Text] MSCI Emerging Markets Index (net)      
MSCI Emerging Markets Index (net) | Average Annual Return, Percent   33.57% 4.20% 8.42%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   25.52% (0.07%) 6.30%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   33.18% 1.31% 7.18%
Institutional Class Shares | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions      
Institutional Class Shares | After Taxes on Distributions | Average Annual Return, Percent   31.76% 1.41% 6.66%
Institutional Class Shares | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return After Taxes on Distributions and Sale of Fund Shares      
Institutional Class Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   19.89% 1.45% 5.74%
Performance Table One Class of after Tax Shown [Text] After-tax returns are shown only for Institutional Class 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 Emerging Markets Index (net) is a free float-adjusted market capitalization-weighted index designed to measure equity market performance in the global emerging markets. The index 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 Institutional Class 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 NFJ Emerging Markets Value Fund | Institutional Class Shares  
Prospectus [Line Items]  
Bar Chart, Year to Date Return none
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 21.65%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (21.20%)
Lowest Quarterly Return, Date Mar. 31, 2020