v3.26.3
Performance Management
Jun. 30, 2026
Virtus Emerging Markets Opportunities 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:

19.07%

Worst Quarter:

2020, Q1:

-23.46%

Year to Date (9/30/2026):

35.83%

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 Emerging Markets Opportunities Fund
12 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2026
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   22.27% 3.11% 7.20%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   29.80% 4.64% 8.19%
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   29.27% 4.78% 7.81%
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   18.82% 4.42% 6.86%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class R6 Shares | Average Annual Return, Percent   29.88% 4.69% 8.24%
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 Emerging Markets Opportunities Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return 35.83%
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 19.07%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (23.46%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus Income & 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 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 Bloomberg US Aggregate Bond Index measures the U.S. investment grade fixed rate bond market. The index is calculated on a total return basis. The indexes are 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:

17.98%

Worst Quarter:

2022, Q2:

-14.97%

Year to Date (9/30/2026):

5.51%

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 Income & Growth Fund
12 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
S&P 500® Index | Average Annual Return, Label [Optional Text] S&P 500® Index      
S&P 500® Index | Average Annual Return, Percent   17.88% 14.42% 14.82%
Bloomberg US Aggregate Bond Index | Average Annual Return, Label [Optional Text] Bloomberg US Aggregate Bond Index      
Bloomberg US Aggregate Bond Index | Average Annual Return, Percent   7.30% (0.36%) 2.01%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   5.47% 4.49% 8.12%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class C Shares | Average Annual Return, Percent   10.78% 4.87% 7.93%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   11.96% 5.93% 9.06%
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   10.37% 3.62% 6.01%
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   7.14% 3.49% 5.63%
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 S&P 500® Index is a free-float market capitalization-weighted index of 500 of the largest U.S. companies. The index is calculated on a total return basis with dividends reinvested. The Bloomberg US Aggregate Bond Index measures the U.S. investment grade fixed rate bond market. The index is calculated on a total return basis. 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 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 Income & Growth Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return 5.51%
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 17.98%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (14.97%)
Lowest Quarterly Return, Date Jun. 30, 2022
Virtus KAR Global 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 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] The MSCI ACWI Index (net) is a free float-adjusted market capitalization-weighted index that measures equity performance of developed and emerging markets. The MSCI ACWI 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:

2020, Q2:

27.60%

Worst Quarter:

2020, Q1:

-26.34%

Year to Date (9/30/2026):

-0.22%

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. 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 Global Small-Cap Fund
12 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI ACWI Index (net) | Average Annual Return, Label [Optional Text] MSCI ACWI Index (net)      
MSCI ACWI Index (net) | Average Annual Return, Percent   22.34% 11.19% 11.72%
MSCI ACWI Small Cap Index (net) | Average Annual Return, Label [Optional Text] MSCI ACWI Small Cap Index (net)      
MSCI ACWI Small Cap Index (net) | Average Annual Return, Percent   19.72% 7.29% 9.32%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   (6.69%) (0.20%) 5.32%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   (0.93%) 1.26% 6.27%
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   (2.02%) (1.03%) 4.03%
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   0.13% 0.56% 4.48%
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 ACWI Index (net) is a free float-adjusted market capitalization-weighted index that measures equity performance of developed and emerging markets. The MSCI ACWI 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 ACWI Small Cap Index (net) is a free float-adjusted market capitalization-weighted index that measures small cap equity performance of developed and 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 KAR Global Small-Cap Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return (0.22%)
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 27.60%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (26.34%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus KAR Health Sciences 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] The Russell 3000® Health Care Index is a free float-adjusted market capitalization-weighted index of companies involved in medical services or healthcare in the Russell 3000® Index, which includes the largest 3,000 US companies as determined by total market capitalization. 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 Institutional Class Shares 
Bar Chart Closing [Text Block]
        

Best Quarter:

2019, Q4:

16.54%

Worst Quarter:

2020, Q1:

-11.80%

Year to Date (9/30/2026):

1.17%

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 KAR Health Sciences Fund
12 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Wilshire 5000 Total Market Index | Average Annual Return, Label [Optional Text] Wilshire 5000 Total Market Index      
Wilshire 5000 Total Market Index | Average Annual Return, Percent   17.13% 13.40% 14.45%
Russell 3000® Health Care Index | Average Annual Return, Label [Optional Text] Russell 3000® Health Care Index      
Russell 3000® Health Care Index | Average Annual Return, Percent   14.56% 6.31% 9.54%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   1.33% 2.35% 6.21%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   7.60% 3.81% 7.15%
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   7.60% 2.23% 5.30%
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   4.50% 2.68% 5.26%
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 Wilshire 5000 Total Market Index (formerly known as 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 3000® Health Care Index is a free float-adjusted market capitalization-weighted index of companies involved in medical services or healthcare in the Russell 3000® Index, which includes the largest 3,000 US companies as determined by total market capitalization. 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 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 KAR Health Sciences Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return 1.17%
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 16.54%
Highest Quarterly Return, Date Dec. 31, 2019
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (11.80%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus NFJ Dividend 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 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 Institutional Class Shares 
Bar Chart Closing [Text Block]
        

Best Quarter:

2023, Q4:

14.87%

Worst Quarter:

2020, Q1:

-26.23%

Year to Date (9/30/2026):

19.31%

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 Dividend Value Fund
12 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Wilshire 5000 Total Market Index | Average Annual Return, Label [Optional Text] Wilshire 5000 Total Market Index      
Wilshire 5000 Total Market Index | Average Annual Return, Percent   17.13% 13.40% 14.45%
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% 10.53%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   2.26% 7.24% 7.58%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class C Shares | Average Annual Return, Percent   7.37% 7.68% 7.40%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   8.43% 8.79% 8.55%
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   5.47% 6.02% 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   7.05% 6.47% 5.93%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class R6 Shares | Average Annual Return, Percent   8.57% 8.87% 8.61%
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 Wilshire 5000 Total Market Index (formerly known as 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® 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 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 Dividend Value Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return 19.31%
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 14.87%
Highest Quarterly Return, Date Dec. 31, 2023
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (26.23%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus NFJ International 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 ACWI 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:

2022, Q4:

20.11%

Worst Quarter:

2020, Q1:

-23.81%

Year to Date (9/30/2026):

17.76%

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.
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 International Value Fund
12 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MSCI ACWI ex USA Index (net) | Average Annual Return, Label [Optional Text] MSCI ACWI ex USA Index (net)      
MSCI ACWI ex USA Index (net) | Average Annual Return, Percent   32.39% 7.91% 8.41%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   34.07% 5.02% 5.05%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   42.41% 6.59% 6.02%
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   39.87% 6.01% 5.18%
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   25.64% 5.20% 4.52%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class R6 Shares | Average Annual Return, Percent   42.48% 6.64% 6.07%
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 ACWI 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.

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 International Value Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return 17.76%
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 20.11%
Highest Quarterly Return, Date Dec. 31, 2022
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (23.81%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus NFJ Large-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 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 Institutional Class Shares 
Bar Chart Closing [Text Block]
        

Best Quarter:

2020, Q2:

15.67%

Worst Quarter:

2020, Q1:

-25.54%

Year to Date (9/30/2026):

18.05%

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 Large-Cap Value Fund
12 Months Ended 50 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Wilshire 5000 Total Market Index | Average Annual Return, Label [Optional Text] Wilshire 5000 Total Market Index        
Wilshire 5000 Total Market Index | Average Annual Return, Percent   17.13% 10.54% 13.40% 14.45%
Wilshire 5000 Total Market Index | Performance Inception Date     Oct. 29, 2021    
Russell 1000® Value Index | Average Annual Return, Label [Optional Text] Russell 1000® Value Index        
Russell 1000® Value Index | Average Annual Return, Percent   15.91% 8.41% 11.33% 10.53%
Russell 1000® Value Index | Performance Inception Date     Oct. 29, 2021    
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class A Shares | Average Annual Return, Percent   0.66%   6.16% 7.85%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Institutional Class Shares | Average Annual Return, Percent   6.75%   7.64% 8.80%
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   4.08%   5.25% 7.10%
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   5.60%   5.58% 6.69%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class R6 Shares | Average Annual Return, Percent   6.91% 3.91%    
Class R6 Shares | Performance Inception Date     Oct. 29, 2021    
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 Wilshire 5000 Total Market Index (formerly known as 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® 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 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 Large-Cap Value Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return 18.05%
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 15.67%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (25.54%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus NFJ 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 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® Value Index is a free float-adjusted market capitalization-weighted index of medium-capitalization, value-oriented stocks. 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 Institutional Class Shares 
Bar Chart Closing [Text Block]
        

Best Quarter:

2020, Q2:

16.58%

Worst Quarter:

2020, Q1:

-28.04%

Year to Date (9/30/2026):

13.39%

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 Mid-Cap Value Fund
12 Months Ended 60 Months Ended 96 Months Ended 120 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Wilshire 5000 Total Market Index | Average Annual Return, Label [Optional Text] Wilshire 5000 Total Market Index        
Wilshire 5000 Total Market Index | Average Annual Return, Percent   17.13% 13.40% 13.64% 14.45%
Wilshire 5000 Total Market Index | Performance Inception Date       Dec. 18, 2017  
Russell Midcap® Value Index | Average Annual Return, Label [Optional Text] Russell Midcap® Value Index        
Russell Midcap® Value Index | Average Annual Return, Percent   11.05% 9.83% 8.11% 9.78%
Russell Midcap® Value Index | Performance Inception Date       Dec. 18, 2017  
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class A Shares | Average Annual Return, Percent   (0.43%) 5.59%   7.79%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class C Shares | Average Annual Return, Percent   4.57% 5.99%   7.58%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Institutional Class Shares | Average Annual Return, Percent   5.71% 7.16%   8.77%
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   4.40% 4.47%   6.67%
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   4.33% 4.98%   6.49%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class R6 Shares | Average Annual Return, Percent   5.78% 7.22% 5.66%  
Class R6 Shares | Performance Inception Date       Dec. 18, 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 Wilshire 5000 Total Market Index (formerly known as 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® Value Index is a free float-adjusted market capitalization-weighted index of medium-capitalization, value-oriented stocks. 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 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 Mid-Cap Value Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return 13.39%
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 16.58%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (28.04%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus NFJ 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 Institutional Class Shares 
Bar Chart Closing [Text Block]
        

Best Quarter:

2020, Q4:

23.37%

Worst Quarter:

2020, Q1:

-32.42%

Year to Date (9/30/2026):

12.28%

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 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 Small-Cap Value Fund
12 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Wilshire 5000 Total Market Index | Average Annual Return, Label [Optional Text] Wilshire 5000 Total Market Index      
Wilshire 5000 Total Market Index | Average Annual Return, Percent   17.13% 13.40% 14.45%
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% 9.27%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   (4.49%) 5.25% 5.23%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   1.40% 6.83% 6.21%
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   0.64% 4.89% 3.69%
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   1.38% 5.03% 4.29%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class R6 Shares | Average Annual Return, Percent   1.46% 6.87% 6.26%
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 Wilshire 5000 Total Market Index (formerly known as 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 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 Small-Cap Value Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return 12.28%
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 23.37%
Highest Quarterly Return, Date Dec. 31, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (32.42%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus Silvant Focused 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 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] 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 Institutional Class Shares 
Bar Chart Closing [Text Block]
        

Best Quarter:

2020, Q2:

30.97%

Worst Quarter:

2022, Q2:

-23.08%

Year to Date (9/30/2026):

2.53%

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 Silvant Focused Growth Fund
12 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Wilshire 5000 Total Market Index | Average Annual Return, Label [Optional Text] Wilshire 5000 Total Market Index      
Wilshire 5000 Total Market Index | Average Annual Return, Percent   17.13% 13.40% 14.45%
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% 18.13%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   13.60% 13.71% 16.88%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class C Shares | Average Annual Return, Percent   19.30% 14.13% 16.64%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   20.55% 15.33% 17.90%
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   19.06% 13.16% 15.62%
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   13.21% 11.67% 14.28%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class R6 Shares | Average Annual Return, Percent   20.62% 15.38% 17.96%
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 Wilshire 5000 Total Market Index (formerly known as 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 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 Silvant Focused Growth Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return 2.53%
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 30.97%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (23.08%)
Lowest Quarterly Return, Date Jun. 30, 2022
Virtus Silvant 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 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] 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 Institutional Class Shares 
Bar Chart Closing [Text Block]
        

Best Quarter:

2020, Q2:

32.90%

Worst Quarter:

2022, Q2:

-24.08%

Year to Date (9/30/2026):

10.05%

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 Silvant Mid-Cap Growth Fund
12 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Wilshire 5000 Total Market Index | Average Annual Return, Label [Optional Text] Wilshire 5000 Total Market Index      
Wilshire 5000 Total Market Index | Average Annual Return, Percent   17.13% 13.40% 14.45%
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% 12.49%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   11.48% 5.34% 12.84%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class C Shares | Average Annual Return, Percent   17.12% 5.72% 12.63%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   18.12% 6.77% 13.81%
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   14.09% 4.71% 11.52%
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   13.52% 4.95% 10.80%
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 Wilshire 5000 Total Market Index (formerly known as 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 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 Silvant Mid-Cap Growth Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return 10.05%
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 32.90%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (24.08%)
Lowest Quarterly Return, Date Jun. 30, 2022
Virtus 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 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 Institutional Class Shares 
Bar Chart Closing [Text Block]
        

Best Quarter:

2020, Q4:

23.60%

Worst Quarter:

2020, Q1:

-28.46%

Year to Date (9/30/2026):

16.25%

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 Small-Cap Fund
12 Months Ended 60 Months Ended 88 Months Ended 120 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Wilshire 5000 Total Market Index | Average Annual Return, Label [Optional Text] Wilshire 5000 Total Market Index        
Wilshire 5000 Total Market Index | Average Annual Return, Percent   17.13% 13.40% 13.75% 14.45%
Wilshire 5000 Total Market Index | Performance Inception Date       Aug. 22, 2018  
Russell 2000® Index | Average Annual Return, Label [Optional Text] Russell 2000® Index        
Russell 2000® Index | Average Annual Return, Percent   12.81% 6.09% 6.53% 9.62%
Russell 2000® Index | Performance Inception Date       Aug. 22, 2018  
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class A Shares | Average Annual Return, Percent   2.15% 6.06%   9.34%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class C Shares | Average Annual Return, Percent   7.31% 6.46%   9.13%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Institutional Class Shares | Average Annual Return, Percent   8.51% 7.65%   10.34%
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   7.31% 5.81%   8.67%
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   5.91% 5.70%   8.00%
Class R6 Shares | Average Annual Return, Label [Optional Text] Return Before Taxes        
Class R6 Shares | Average Annual Return, Percent   8.56% 7.70% 7.40%  
Class R6 Shares | Performance Inception Date       Aug. 22, 2018  
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 Wilshire 5000 Total Market Index (formerly known as 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 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 Small-Cap Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return 16.25%
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 23.60%
Highest Quarterly Return, Date Dec. 31, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (28.46%)
Lowest Quarterly Return, Date Mar. 31, 2020
Virtus Zevenbergen Technology 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 two style-specific benchmarks that reflect the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.

Performance for Class R6 Shares is not shown here as Class R6 Shares had not begun operations until May 21, 2026 and therefore had no performance for the periods shown.

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.
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:

35.47%

Worst Quarter:

2022, Q2:

-25.79%

Year to Date (9/30/2026):

30.82%

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 Zevenbergen Technology Fund
12 Months Ended 60 Months Ended 120 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Wilshire 5000 Total Market Index | Average Annual Return, Label [Optional Text] Wilshire 5000 Total Market Index      
Wilshire 5000 Total Market Index | Average Annual Return, Percent   17.13% 13.40% 14.45%
S&P North American Technology Index | Average Annual Return, Label [Optional Text] S&P North American Technology Index      
S&P North American Technology Index | Average Annual Return, Percent   27.82% 18.02% 22.54%
Nasdaq Composite® Index | Average Annual Return, Label [Optional Text] Nasdaq Composite® Index      
Nasdaq Composite® Index | Average Annual Return, Percent   21.14% 13.35% 17.66%
Class A Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class A Shares | Average Annual Return, Percent   17.90% 11.20% 19.56%
Class C Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Class C Shares | Average Annual Return, Percent   23.86% 11.64% 19.35%
Institutional Class Shares | Average Annual Return, Label [Optional Text] Return Before Taxes      
Institutional Class Shares | Average Annual Return, Percent   25.08% 12.77% 20.61%
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   24.35% 10.11% 17.09%
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   15.36% 8.96% 15.82%
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 Wilshire 5000 Total Market Index (formerly known as 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 S&P North American Technology Sector Index is a modified capitalization-weighted index of selected technology and internet-related stocks. The Nasdaq Composite Index is a market capitalization-weighted index of all common stocks listed on the Nasdaq Stock Market. The indexes are calculated on a total return basis. 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 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 Zevenbergen Technology Fund | Institutional Class Shares  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] Year to Date
Bar Chart, Year to Date Return 30.82%
Bar Chart, Year to Date Return, Date Sep. 30, 2026
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 35.47%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (25.79%)
Lowest Quarterly Return, Date Jun. 30, 2022