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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Sep. 30, 2016
Registrant Name dei_EntityRegistrantName VIRTUS OPPORTUNITIES TRUST
Central Index Key dei_EntityCentralIndexKey 0001005020
Amendment Flag dei_AmendmentFlag false
Trading Symbol dei_TradingSymbol VOT
Document Creation Date dei_DocumentCreationDate Apr. 10, 2017
Document Effective Date dei_DocumentEffectiveDate Apr. 10, 2017
Prospectus Date rr_ProspectusDate Apr. 10, 2017
Virtus Greater European Opportunities Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Virtus Greater European Opportunities Fund
Objective [Heading] rr_ObjectiveHeading
Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The fund has an investment objective of long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading
Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The tables below illustrate all fees and expenses that you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts in Class A Shares if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Funds. You may qualify for sales charge discounts in Class T Shares if you invest at least $250,000 in the fund. More information on these and other discounts is available: (i) from your financial advisor or other financial intermediary; (ii) under "Sales Charges" on page 209 of the fund’s prospectus; (iii) with respect to purchase of shares through specific intermediaries, in Appendix A to the fund’s prospectus, entitled "Intermediary Sales Charge Discounts and Waivers;" and (iv) under "Alternative Purchase Arrangements" on page 107 of the fund’s statement of additional information.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption
Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination April 30, 2018
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund's portfolio turnover rate was 49% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 49.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock
The deferred sales charge is imposed on Class C Shares redeemed during the first year only.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts
You may qualify for sales charge discounts in Class A Shares if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Funds. You may qualify for sales charge discounts in Class T Shares if you invest at least $250,000 in the fund.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates
Estimated for current fiscal year, as annualized.
Expense Example [Heading] rr_ExpenseExampleHeading
Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year, that the fund’s operating expenses remain the same and that the expense reimbursement arrangement remains in place for the contractual period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading
Investments, Risks and Performance
Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
This fund seeks to offer investors exposure to European market economies through well-established companies. The securities selected for inclusion in the fund are believed by the subadviser to be well-managed businesses with consistent operating histories and financial performance that have favorable long-term economic prospects and, in most cases, generate free cash flow. Over full market cycles, the investment style is designed with the objective of capturing part of the up market cycles and may offer protection in down market cycles.
Under normal circumstances, at least 80% of the fund’s assets are invested in equity securities or equity-linked instruments of issuers located in Europe, including issuers in emerging markets countries. Equity-linked securities are hybrid debt securities whose return is connected to an underlying equity, usually a stock. The fund intends to diversify its investments among countries and normally to have represented in the portfolio business activities of a number of different countries. In determining the “location” of an issuer, the subadviser primarily relies on the country where the issuer is incorporated. However, the country of risk is ultimately determined based on analysis of the following criteria: actual building address (domicile), primary exchange on which the security is traded and country in which the greatest percentage of company revenue is generated. This evaluation is conducted so as to determine that the issuer’s assets are exposed to the economic fortunes and risks of the designated country.
Risk [Heading] rr_RiskHeading
Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

The fund may not achieve its objective(s), and it is not intended to be a complete investment program. The value of the fund's investments that supports your share value may decrease. If between the time you purchase shares and the time you sell shares the value of the fund's investments decreases, you will lose money. Investment values can decrease for a number of reasons. Conditions affecting the overall economy, specific industries or companies in which the fund invests can be worse than expected, and investments may fail to perform as the subadviser expects. As a result, the value of your shares may decrease. Purchase and redemption activities by fund shareholders may impact the management of the fund and its ability to achieve its investment objective(s). The redemption by one or more large shareholders or groups of shareholders of their holdings in the fund could have an adverse impact on the remaining shareholders in the fund including by accelerating the realization of capital gains and increasing the fund's transaction costs. The principal risks of investing in the fund are:

>     Emerging Market Investing Risk.  The risk that prices of emerging markets securities will be more volatile, or will be more greatly affected by negative conditions, than those of their counterparts in more established foreign markets.

>     Equity-Linked Instruments Risk.  The risk that, in addition to market risk and other risks of the referenced equity security, the fund may experience a return that is different from that of the referenced equity security. Equity-linked instruments also subject the fund to counterparty risk, including the risk that the issuing entity may not be able to honor its financial commitment, which could result in a loss of all or part of the fund's investment.

>     Equity Securities Risk.  The risk that events negatively affecting issuers, industries or financial markets in which the fund invests will impact the value of the stocks held by the fund and, thus, the value of the fund's shares over short or extended periods. Investments in a particular style or in small or medium-sized companies may enhance that risk.

>     Foreign Investing Risk.  The risk that the prices of foreign securities in the fund's portfolio will be more volatile than those of domestic securities, or will be negatively affected by currency fluctuations, less regulated or liquid securities markets, or economic, political or other developments.

>     Geographic Concentration Risk.  The risk that events negatively affecting the geographic location where the fund focuses its investments will cause the value of the fund's shares to decrease, perhaps significantly.

>     Market Volatility Risk.  The risk that the value of the securities in which the fund invests may go up or down in response to the prospects of individual issuers and/or general economic conditions. Price changes may be temporary or may last for extended periods.
Risk Lose Money [Text] rr_RiskLoseMoney
If between the time you purchase shares and the time you sell shares the value of the fund’s investments decreases, you will lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading
Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
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.
 
Performance for Class T Shares is not shown here as Class T Shares were not available prior to the date of this prospectus.
 
The bar chart shows changes in the fund’s performance from year to year over the life of the fund. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index. Updated performance information is available at virtus.com or by calling 800-243-1574.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns
The bar chart shows changes in the fund’s performance from year to year over the life of the fund. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone
800-243-1574
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress
virtus.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture
The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading
Calendar year total returns for Class I Shares
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock
Returns do not reflect sales charges and would be lower if they did.
 
Annual Return (%)
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads
Returns do not reflect sales charges and would be lower if they did.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
​
Best Quarter:
 ​ ​
Q1/2012:
 ​ ​
11.70%
 ​ ​
Worst Quarter:​
 ​ ​
Q3/2011:
 ​ ​
-13.26%
 ​ ​
Year to Date (3/31/17):​
 ​ ​
10.81%
Performance Table Heading rr_PerformanceTableHeading
Average Annual Total Returns (for the periods ended 12/31/16)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads
Returns reflect deduction of maximum sales charges and full redemption at end of periods shown.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate
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.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred
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 One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown
After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher
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 Narrative rr_PerformanceTableNarrativeTextBlock
Returns reflect deduction of maximum sales charges and full redemption at end of periods shown.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
The MSCI Europe Index (net) is a free float-adjusted market capitalization weighted index that measures equity market performance of the developed markets in Europe. The MSCI Europe Index (net) is calculated on a total-return basis with net dividends reinvested. The index is unmanaged and not available for direct investment. 
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Virtus Greater European Opportunities Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol VGEAX
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.85%
Distribution and Shareholder Servicing (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.71%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.81%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.36%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.45% [1]
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
1 Year rr_ExpenseExampleYear01 714
3 Years rr_ExpenseExampleYear03 1,079
5 Years rr_ExpenseExampleYear05 1,467
10 Years rr_ExpenseExampleYear10 2,551
1 Year rr_ExpenseExampleNoRedemptionYear01 714
3 Years rr_ExpenseExampleNoRedemptionYear03 1,079
5 Years rr_ExpenseExampleNoRedemptionYear05 1,467
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,551
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (11.72%)
5 Years rr_AverageAnnualReturnYear05 4.90%
Since Inception rr_AverageAnnualReturnSinceInception 8.55%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 21, 2009
Virtus Greater European Opportunities Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol VGECX
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00% [2]
Management Fees rr_ManagementFeesOverAssets 0.85%
Distribution and Shareholder Servicing (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.71%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.56%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.36%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 2.20% [1]
1 Year rr_ExpenseExampleYear01 $ 323
3 Years rr_ExpenseExampleYear03 762
5 Years rr_ExpenseExampleYear05 1,328
10 Years rr_ExpenseExampleYear10 2,868
1 Year rr_ExpenseExampleNoRedemptionYear01 223
3 Years rr_ExpenseExampleNoRedemptionYear03 762
5 Years rr_ExpenseExampleNoRedemptionYear05 1,328
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,868
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (7.08%)
5 Years rr_AverageAnnualReturnYear05 5.37%
Since Inception rr_AverageAnnualReturnSinceInception 8.57%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 21, 2009
Virtus Greater European Opportunities Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol VGEIX
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.85%
Distribution and Shareholder Servicing (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.71%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.56%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.36%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.20% [1]
1 Year rr_ExpenseExampleYear01 $ 122
3 Years rr_ExpenseExampleYear03 457
5 Years rr_ExpenseExampleYear05 816
10 Years rr_ExpenseExampleYear10 1,826
1 Year rr_ExpenseExampleNoRedemptionYear01 122
3 Years rr_ExpenseExampleNoRedemptionYear03 457
5 Years rr_ExpenseExampleNoRedemptionYear05 816
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,826
2010 rr_AnnualReturn2010 7.43%
2011 rr_AnnualReturn2011 1.18%
2012 rr_AnnualReturn2012 25.98%
2013 rr_AnnualReturn2013 12.34%
2014 rr_AnnualReturn2014 (4.05%)
2015 rr_AnnualReturn2015 7.03%
2016 rr_AnnualReturn2016 (6.10%)
Year to Date Return, Label rr_YearToDateReturnLabel Year to Date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2017
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 10.81%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel
Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.70%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel
Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.26%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (6.10%)
5 Years rr_AverageAnnualReturnYear05 6.42%
Since Inception rr_AverageAnnualReturnSinceInception 9.66%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 21, 2009
Virtus Greater European Opportunities Fund | Class T  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol VEGTX
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.50%
Maximum Deferred Sales Charge (load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.85%
Distribution and Shareholder Servicing (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.71% [3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.81%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.36%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.45% [1]
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 250,000
1 Year rr_ExpenseExampleYear01 394
3 Years rr_ExpenseExampleYear03 771
5 Years rr_ExpenseExampleYear05 1,179
10 Years rr_ExpenseExampleYear10 2,295
1 Year rr_ExpenseExampleNoRedemptionYear01 394
3 Years rr_ExpenseExampleNoRedemptionYear03 771
5 Years rr_ExpenseExampleNoRedemptionYear05 1,179
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,295
Virtus Greater European Opportunities Fund | Return After Taxes on Distributions | Class I  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (6.34%)
5 Years rr_AverageAnnualReturnYear05 6.03%
Since Inception rr_AverageAnnualReturnSinceInception 9.01%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 21, 2009
Virtus Greater European Opportunities Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class I  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 (2.88%)
5 Years rr_AverageAnnualReturnYear05 5.23%
Since Inception rr_AverageAnnualReturnSinceInception 8.13%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 21, 2009
Virtus Greater European Opportunities Fund | MSCI Europe Index (net)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes
(reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel MSCI Europe Index (net) (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.40%)
5 Years rr_AverageAnnualReturnYear05 6.25%
Since Inception rr_AverageAnnualReturnSinceInception 8.62%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 21, 2009
[1] The fund's investment adviser has contractually agreed to limit the fund's total operating expenses (excluding certain expenses, including dividend and interest expenses, leverage expenses, taxes, brokerage commissions, extraordinary expenses and acquired fund fees and expenses, if any) so that such expenses do not exceed 1.45% for Class A Shares, 2.20% for Class C Shares, 1.20% for Class I Shares and 1.45% for Class T Shares through April 30, 2018. Following the contractual period, the adviser may discontinue these expense reimbursement arrangements at any time. Under certain conditions, the adviser may recapture operating expenses reimbursed under these arrangements for a period of three years following the time such reimbursement occurred.
[2] The deferred sales charge is imposed on Class C Shares redeemed during the first year only.
[3] Estimated for current fiscal year, as annualized.