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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Sep. 30, 2013
Entity Registrant Name dei_EntityRegistrantName VIRTUS OPPORTUNITIES TRUST
Entity Central Index Key dei_EntityCentralIndexKey 0001005020
Amendment Flag dei_AmendmentFlag false
Trading Symbol dei_TradingSymbol vot
Document Creation Date dei_DocumentCreationDate Jan. 27, 2014
Document Effective Date dei_DocumentEffectiveDate Jan. 28, 2014
Prospectus Date rr_ProspectusDate Jan. 28, 2014
Virtus Emerging Markets Small-Cap Fund
 
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Virtus Emerging Markets Small-Cap Fund
Objective [Heading] rr_ObjectiveHeading
Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The fund has an investment objective of 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 if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Mutual Funds. More information about these and other discounts is available from your financial advisor and under Sales Charges on page 215 of the funds prospectus and Alternative Purchase Arrangements on page 103 of the funds 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
January 31, 2015
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 funds performance.
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock
Generally, Class A Shares are not subject to any charges by the Fund when redeemed; however, a contingent deferred sales charge may be imposed on certain redemptions (i) within 18 months on exchanges from a Virtus non-money market fund into a Virtus money market fund; and (ii) on purchases on which a finder’s fee has been paid. The 18-month period begins on the last day of the month preceding the month in which the purchase was made. 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 if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates
Estimated for current fiscal year.
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 and that the funds operating expenses remain the same and that the expense reimbursement arrangement remains in place only for the period indicated. 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
The fund pursues capital appreciation in emerging markets small-cap equities. The fund invests in a select group of small-cap companies believed by the subadviser to be undervalued relative to their future market growth potential. The investment strategy emphasizes companies that the subadviser believes to have a sustainable competitive advantage, strong management and low financial risk and to be able to grow over market cycles.
Under normal circumstances, the fund invests at least 80% of its assets in equity or equity-linked securities of small capitalization companies located in emerging markets countries. The funds subadviser considers small-capitalization companies to be those companies that, at the time of initial purchase, have market capitalizations of between [$75 million and $5 billion]. Emerging markets countries generally include every nation in the world except the U.S., Canada, Japan, Australia, New Zealand and most nations located in Western Europe. 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 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 or profit is generated. This evaluation is conducted so as to determine that the issuerassets are exposed to the economic fortunes and risks of the designated country. Equity securities in which the fund invests include common stocks, preferred stocks and American Depositary Receipts (ADRs). The subadviser does not use allocation models to restrict the fund's investments to certain regions, countries or industries. Generally, the fund invests in approximately 30-60 securities at any given time.
Risk [Heading] rr_RiskHeading
Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The fund may not achieve its objective, 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:
 
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  • Depositary Receipts. The risk that investments in foreign companies through depositary receipts will expose the fund to the same risks as direct investment in securities of foreign issuers.
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  • 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.
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  • 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.
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  • 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.
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  • 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 or economic, political or other developments.
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  • Limited Number of Investments Risk. The risk that the fund’s portfolio will be more susceptible to factors adversely affecting issuers of securities in the fund’s portfolio than would a fund holding a greater number of securities.
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  • 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 companies and/or general economic conditions. Price changes may be temporary or may last for extended periods.
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  • Small Market Capitalization Companies Risk. The risk that the fund’s investments in small market capitalization companies will increase the volatility and risk of loss to the fund, as compared with investments in larger, more established companies.
Risk Lose Money [Text] rr_RiskLoseMoney
If between the time you purchase shares and the time you sell shares the value of the funds investments decreases, you will lose money. 
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading
Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The fund has not had a full calendar year of operations; therefore, performance information is not shown here.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess
The fund has not had a full calendar year of operations; therefore, performance information is not shown here.
Virtus Emerging Markets Small-Cap Fund | Class A
 
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol VAESX
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 1.00% [1]
Management Fees rr_ManagementFeesOverAssets 1.20%
Distribution and Shareholder Servicing (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.66% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.11%
Less: Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.26%) [3]
Total Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.85%
1 Year rr_ExpenseExampleYear01 752
3 Years rr_ExpenseExampleYear03 1,174
1 Year rr_ExpenseExampleNoRedemptionYear01 752
3 Years rr_ExpenseExampleNoRedemptionYear03 1,174
Virtus Emerging Markets Small-Cap Fund | Class C
 
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol VCESX
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% [4]
Management Fees rr_ManagementFeesOverAssets 1.20%
Distribution and Shareholder Servicing (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.66% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.86%
Less: Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.26%) [3]
Total Annual Fund Operating Expenses rr_NetExpensesOverAssets 2.60%
1 Year rr_ExpenseExampleYear01 363
3 Years rr_ExpenseExampleYear03 861
1 Year rr_ExpenseExampleNoRedemptionYear01 263
3 Years rr_ExpenseExampleNoRedemptionYear03 861
Virtus Emerging Markets Small-Cap Fund | Class I
 
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol VIESX
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 1.20%
Distribution and Shareholder Servicing (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.66% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.86%
Less: Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.26%) [3]
Total Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.60%
1 Year rr_ExpenseExampleYear01 163
3 Years rr_ExpenseExampleYear03 560
1 Year rr_ExpenseExampleNoRedemptionYear01 163
3 Years rr_ExpenseExampleNoRedemptionYear03 $ 560
[1] Generally, Class A Shares are not subject to any charges by the Fund when redeemed; however, a contingent deferred sales charge may be imposed on certain redemptions (i) within 18 months on exchanges from a Virtus non-money market fund into a Virtus money market fund; and (ii) on purchases on which a finder's fee has been paid. The 18-month period begins on the last day of the month preceding the month in which the purchase was made.
[2] Estimated for current fiscal year.
[3] The fund's investment adviser has contractually agreed to limit the fund's total operating expenses (excluding interest, taxes, extraordinary expenses and acquired fund fees and expenses) so that such expenses do not exceed 1.85% for Class A Shares, 2.60% for Class C Shares and 1.60% for Class I Shares through January 31, 2015. 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 fiscal year in which such reimbursement occurred.
[4] The deferred sales charge is imposed on Class C Shares redeemed during the first year only.