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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName VIRTUS OPPORTUNITIES TRUST
Prospectus Date rr_ProspectusDate Jan. 31, 2013
Virtus Alternatives Diversifier Fund
 
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Virtus Alternatives Diversifier Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund is a fund of funds that 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 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, as well as eligibility requirements for each share class, is available from your financial advisor and under “Sales Charges” on page 193 of the fund’s prospectus and “Alternative Purchase Arrangements” on page 57 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)
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 shares of the underlying funds (or “turns over” its portfolio). The fund does not pay transaction costs when it buys and sells shares of the underlying mutual funds. 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 29% of the value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 29.00%
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 within 18 months on exchanges from a Virtus non-money market fund into a Virtus money market fund and 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
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect current expenses.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Fund Operating Expenses do not correlate to the ratio of expense to average net assets appearing in the Financial Highlights tables, which tables reflect only the operating expenses of the fund and do not include acquired fund fees and expenses.
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. It shows your costs if you sold your shares at the end of the period or continued to hold them. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. 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 seeks to achieve its objective by investing its assets in a mix of underlying affiliated and unaffiliated mutual funds and exchange-traded funds (“ETFs”) (collectively, “underlying funds”). The fund emphasizes low correlating asset classes in order to help reduce volatility and increase return potential. Applying an innovative, institutional-level approach to investing, the fund invests in a diversified portfolio of alternative asset classes including managed futures, global real estate, global infrastructure, natural resources, commodities, currencies, and floating rate securities. Among the underlying funds in which the fund invests are equity funds that invest principally in equity securities of issuers of any capitalization, including those of foreign issuers, including emerging markets issuers. Under normal circumstances, the fund will generally invest in affiliated mutual funds where available to represent the desired asset classes, and unaffiliated mutual funds and/or ETFs to represent the desired asset classes for which affiliated mutual funds are unavailable or deemed not to be appropriate for the fund. The fund is non-diversified under federal securities laws.
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 adviser expects. As a result, the value of your shares may decrease. In addition, you will also be subject to the risks associated with the principal investment strategies of the underlying funds in which the fund invests. The principal risks of investing in the fund are:
  • Affiliated Fund Risk. The risk that the adviser’s authority to select and substitute underlying funds from a variety of affiliated and unaffiliated mutual funds may create a conflict of interest.
  • Allocation Risk. The risk that the fund’s exposure to equities and fixed income securities, or to different asset classes, may vary from the intended allocation or may not be optimum for market conditions at a given time.
  • Fund of Funds Risk. The risk that the underlying funds in which the fund invests will expose the fund to negative performance and additional expenses associated with investment in such funds, and increased volatility.
The principal risks attributable to the underlying funds in which the fund invests are:
  • Commodity Risk. The risk that investments in commodities or commodity-linked notes will subject the fund’s portfolio to greater volatility than investments in traditional securities, or that commodity-linked instruments will experience returns different from the commodities they attempt to track.
  • Credit Risk. The risk that the issuer of a security will fail to pay interest or principal in a timely manner, or that negative perceptions of the issuer’s ability to make such payments will cause the price of the security to decline.
  • Derivatives Risk. The risk that the fund will incur a loss greater than the fund’s investment in, or will experience greater share price volatility as a result of investing in, a derivative contract.
  • 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 Real Estate Investment Trust (REIT) Securities Risk. The risk that, in addition to the risks associated with investing in the real estate industry, the value of the fund’s shares will be negatively affected by factors specific to investing through a pooled vehicle, such as through poor management of a REIT or REIT-like entity, concentration risk, or other risks typically associated with investing in small or medium market capitalization companies.
  • 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 smaller companies may be more volatile than investments in larger companies.
  • Exchange-Traded Funds (ETFs) Risk. The risk that the value of an ETF will be more volatile than the underlying portfolio of securities the ETF is designed to track, or that the costs to the fund of owning shares of the ETF will exceed those the fund would incur by investing in such securities directly.
  • 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 economic, political or other developments.
  • High Yield-High Risk Fixed Income Securities Risk. The risk that the issuers of high yield-high risk securities in the fund’s portfolio will default, that the prices of such securities will be volatile, and that the securities will not be liquid.
  • Income Risk. The risk that income received from the fund will vary widely over the short- and long-term.
  • Industry/Sector Concentration Risk. The risk that events negatively affecting an industry or market sector in which a fund focuses its investments will cause the value of the fund’s shares to decrease, perhaps significantly.
  • Infrastructure-Related Risk. The risk that the value of the fund’s shares will decrease as a result of conditions, such as general or local economic conditions and political developments, changes in regulations, environmental problems, casualty losses, and changes in interest rates, negatively affecting the infrastructure companies in which the fund invests.
  • Interest Rate Risk. The risk that when interest rates rise, the values of the fund’s debt securities, especially those with longer maturities, will fall.
  • Leverage Risk. The risk that the value of the fund’s shares will be more volatile or that the fund will incur a loss greater than the fund’s investment in a given security when leverage is used.
  • Liquidity Risk. The risk that certain securities may be difficult or impossible to sell at the time and price beneficial to the fund.
  • Market Volatility Risk. 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.
  • Master Limited Partnership (MLP) Risk. The risk that the fund’s investments in MLP units will be negatively impacted by tax law changes, regulatory developments or other factors affecting the MLP’s underlying assets.
  • Non-Diversification Risk. The risk that the fund will be more susceptible to factors negatively impacting the securities in its portfolio to the extent that each such security represents a significant portion of the fund’s assets.
  • Preferred Stock Risk. The risk that a preferred stock will decline in price, fail to pay dividends when expected, or be illiquid.
  • Short Sales Risk. The risk that a fund may experience a loss if the price of a borrowed security increases between the date of a short sale and the date on which the fund replaces the security.
  • Unrated Fixed Income Securities Risk. The risk that the subadviser will be unable to accurately assess the quality of an unrated fixed income security, so that the fund invests in a security with greater risk than intended, or that the liquidity of unrated fixed income securities in which the fund invests will be hindered, making it difficult for the fund to sell them.
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.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus
  • Non-Diversification Risk. The risk that the fund will be more susceptible to factors negatively impacting the securities in its portfolio to the extent that each such security represents a significant portion of the fund’s assets.
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.

The bar chart shows changes in the fund’s performance from year to year over the life of the fund. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index and a composite benchmark. 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 and a composite benchmark.
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 A Shares (includes returns of a predecessor fund)
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
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended 12/31/12; includes returns of a predecessor fund)
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 A 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 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 Alternatives Diversifier Composite Benchmark consists of: HFRX Equity Market Neutral Index (20%), UBS Global Investors (Real Estate) Index (20%), Global Infrastructure, represented by the MSCI World Infrastructure Sector Capped Index (since 9/1/2008) (15%), S&P North American Natural Resources Sector Index (10%), Deutsche Bank Liquid Commodity Index (15%), Deutsche Bank G10 Currency Harvest Index (10%) and Credit Suisse Leveraged Loan Index (10%). Prior to 9/1/2008, the Global Infrastructure component was represented by a mix of MSCI US Utilities Index (65%), MSCI World Telecom Services Index (20%) and MSCI World ex US Utilities Index (15%). The indexes are unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class A Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.
Virtus Alternatives Diversifier Fund | Class A
 
Risk/Return: rr_RiskReturnAbstract  
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 none
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.40% [2]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 1.03% [3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.68% [2]
1 Year rr_ExpenseExampleYear01 736
3 Years rr_ExpenseExampleYear03 1,074
5 Years rr_ExpenseExampleYear05 1,435
10 Years rr_ExpenseExampleYear10 2,448
1 Year rr_ExpenseExampleNoRedemptionYear01 736
3 Years rr_ExpenseExampleNoRedemptionYear03 1,074
5 Years rr_ExpenseExampleNoRedemptionYear05 1,435
10 Years rr_ExpenseExampleNoRedemptionYear10 2,448
2006 rr_AnnualReturn2006 13.26%
2007 rr_AnnualReturn2007 7.34%
2008 rr_AnnualReturn2008 (28.88%)
2009 rr_AnnualReturn2009 20.68%
2010 rr_AnnualReturn2010 10.55%
2011 rr_AnnualReturn2011 (2.54%)
2012 rr_AnnualReturn2012 9.70%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.30%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.63%)
1 Year rr_AverageAnnualReturnYear01 3.40%
5 Years rr_AverageAnnualReturnYear05 (0.89%)
Since Inception rr_AverageAnnualReturnSinceInception 2.16%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2005
Virtus Alternatives Diversifier Fund | Class C
 
Risk/Return: rr_RiskReturnAbstract  
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 none
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.40% [2]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 1.03% [3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.43% [2]
1 Year rr_ExpenseExampleYear01 346
3 Years rr_ExpenseExampleYear03 758
5 Years rr_ExpenseExampleYear05 1,296
10 Years rr_ExpenseExampleYear10 2,766
1 Year rr_ExpenseExampleNoRedemptionYear01 246
3 Years rr_ExpenseExampleNoRedemptionYear03 758
5 Years rr_ExpenseExampleNoRedemptionYear05 1,296
10 Years rr_ExpenseExampleNoRedemptionYear10 2,766
1 Year rr_AverageAnnualReturnYear01 8.85%
5 Years rr_AverageAnnualReturnYear05 (0.45%)
Since Inception rr_AverageAnnualReturnSinceInception 2.25%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2005
Virtus Alternatives Diversifier Fund | Class I
 
Risk/Return: rr_RiskReturnAbstract  
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 none
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.40% [2]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 1.03% [3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.43% [2]
1 Year rr_ExpenseExampleYear01 146
3 Years rr_ExpenseExampleYear03 452
5 Years rr_ExpenseExampleYear05 782
10 Years rr_ExpenseExampleYear10 1,713
1 Year rr_ExpenseExampleNoRedemptionYear01 146
3 Years rr_ExpenseExampleNoRedemptionYear03 452
5 Years rr_ExpenseExampleNoRedemptionYear05 782
10 Years rr_ExpenseExampleNoRedemptionYear10 1,713
1 Year rr_AverageAnnualReturnYear01 9.99%
5 Years rr_AverageAnnualReturnYear05   
Since Inception rr_AverageAnnualReturnSinceInception 7.73%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2009
Virtus Alternatives Diversifier Fund | Return After Taxes on Distributions | Class A
 
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.44%
5 Years rr_AverageAnnualReturnYear05 (1.56%)
Since Inception rr_AverageAnnualReturnSinceInception 1.58%
Virtus Alternatives Diversifier Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class A
 
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.94%
5 Years rr_AverageAnnualReturnYear05 (1.19%)
Since Inception rr_AverageAnnualReturnSinceInception 1.50%
Virtus Alternatives Diversifier Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)
 
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.00%
5 Years rr_AverageAnnualReturnYear05 1.66%
Virtus Alternatives Diversifier Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes) | Class A
 
Risk/Return: rr_RiskReturnAbstract  
Since Inception rr_AverageAnnualReturnSinceInception 4.07%
Virtus Alternatives Diversifier Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes) | Class C
 
Risk/Return: rr_RiskReturnAbstract  
Since Inception rr_AverageAnnualReturnSinceInception 4.07%
Virtus Alternatives Diversifier Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes) | Class I
 
Risk/Return: rr_RiskReturnAbstract  
Since Inception rr_AverageAnnualReturnSinceInception 12.89%
Virtus Alternatives Diversifier Fund | Composite Benchmark (reflects no deduction for fees, expenses or taxes)
 
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.96%
5 Years rr_AverageAnnualReturnYear05 0.68%
Virtus Alternatives Diversifier Fund | Composite Benchmark (reflects no deduction for fees, expenses or taxes) | Class A
 
Risk/Return: rr_RiskReturnAbstract  
Since Inception rr_AverageAnnualReturnSinceInception 4.21%
Virtus Alternatives Diversifier Fund | Composite Benchmark (reflects no deduction for fees, expenses or taxes) | Class C
 
Risk/Return: rr_RiskReturnAbstract  
Since Inception rr_AverageAnnualReturnSinceInception 4.21%
Virtus Alternatives Diversifier Fund | Composite Benchmark (reflects no deduction for fees, expenses or taxes) | Class I
 
Risk/Return: rr_RiskReturnAbstract  
Since Inception rr_AverageAnnualReturnSinceInception 7.22%
[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 within 18 months on exchanges from a Virtus non-money market fund into a Virtus money market fund and 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] Restated to reflect current expenses.
[3] The Total Annual Fund Operating Expenses do not correlate to the ratio of expense to average net assets appearing in the Financial Highlights tables, which tables reflect only the operating expenses of the fund and do not include acquired fund fees and expenses.
[4] The deferred sales charge is imposed on Class C Shares redeemed during the first year only.