FORM N-1A

Objective, Primary [Text Block]

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rr_ObjectivePrimaryTextBlock

Investment Objective. The Fund seeks total return.

Expense Narrative [Text Block]

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Fees and Expenses of the Fund. This table describes the fees and expenses that you may pay if you buy and hold or redeem shares of the Fund. You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $50,000 in certain funds in the Oppenheimer family of funds. More information about these and other discounts is available from your financial professional and in the section "About Your Account" beginning on page 15 of the prospectus and in the sections "How to Buy Shares" beginning on page 59 and "Appendix A" in the Fund's Statement of Additional Information.

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

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Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

^[1]

Portfolio Turnover [Text Block]

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Portfolio Turnover. 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 the 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 130% of the average value of its portfolio.

Portfolio Turnover, Rate

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130.00%

Expense Breakpoint Discounts [Text]

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You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $50,000 in certain funds in the Oppenheimer family of funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expense Example Narrative [Text Block]

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Example. The following 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 a class of shares of the Fund for the time periods indicated. 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 expenses would be as follows:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

If shares are redeemed

Expense Example, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

If shares are not redeemed

Strategy Narrative [Text Block]

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Principal Investment Strategies. The Fund invests mainly in debt securities of government and corporate issuers in foreign emerging market countries. A debt security is a security representing money borrowed by the issuer that must be repaid. The terms of a debt security specify the amount of principal, the interest rate or discount, and the time or times at which payments are due. The Fund can invest in various types of debt securities, generally referred to as "bonds," including government bonds, corporate debt obligations, "structured" notes, participation interests in loans, "zero coupon" or "stripped" securities, certain mortgage-related securities or asset-backed securities and other debt obligations.

Under normal market conditions, determined by the Sub-Adviser in its discretion, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in debt securities that are economically tied to emerging market countries. The Fund typically invests in at least three emerging market countries. In general, emerging markets are countries outside of the United States, most of Western Europe, Canada, Japan, Australia and New Zealand. Debt securities that the Fund considers to be economically tied to emerging market countries include debt securities issued by sovereign entities of emerging market countries, or corporations that are organized, headquartered or domiciled, or whose principal activities are in emerging market countries.

The Fund may buy securities issued by companies of any size or market capitalization range and at times might emphasize securities of issuers in a particular capitalization range. It can invest in debt securities having short, intermediate or long maturities.

The Fund does not limit its investments to a particular credit quality or rating category and can invest without limit in securities below investment grade (also referred to as "junk bonds"). "Investment grade" debt securities are rated in one of the top four categories by nationally recognized statistical rating organizations such as Moody's or Standard & Poor's. The Fund may also invest in unrated securities, in which case the portfolio manager may internally assign ratings to certain of those securities, after assessing their credit quality, in categories similar to those of nationally recognized statistical rating organizations.

The Fund may also use derivatives to seek increased returns or to try to manage investment risks, including, for example, options, forward contracts, futures contracts, swaps and "structured" notes.

In selecting securities, the portfolio manager evaluates the overall investment opportunities and risks in individual national economies. The portfolio manager analyzes the business cycle, political factors and exchange rates across countries. The Fund currently focuses on investment opportunities for higher yields than are available in U.S. markets and opportunities in investments denominated in foreign currencies that compare favorably to the U.S. dollar. These factors may vary in particular cases and may change over time.

Risk Narrative [Text Block]

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Principal Risks. The price of the Fund's shares can go up and down substantially. The value of the Fund's investments may change because of broad changes in the markets in which the Fund invests or because of poor investment selection, which could cause the Fund to underperform other funds with similar investment objectives. There is no assurance that the Fund will achieve its investment objective. When you redeem your shares, they may be worth more or less than what you paid for them. These risks mean that you can lose money by investing in the Fund.

Risks of Foreign Investing. Foreign securities are subject to special risks. Foreign issuers are usually not subject to the same accounting and disclosure requirements that U.S. companies are subject to, which may make it difficult to evaluate a foreign company's operations or financial condition. A change in the value of a foreign currency against the U.S. dollar will result in a change in the U.S. dollar value of securities denominated in that foreign currency and in the value of any income or distributions the Fund may receive on those securities. The value of foreign investments may be affected by exchange control regulations, foreign taxes, higher transaction and other costs, delays in the settlement of transactions, changes in economic or monetary policy in the U.S. or abroad, expropriation or nationalization of a company's assets, or other political and economic factors. Investments in foreign securities may also expose the Fund to time-zone arbitrage risk. These risks may be greater for investments in developing or emerging market countries.

Foreign Currency Risk. Fluctuations in foreign currency values will result in fluctuations in the U.S. dollar value of securities denominated in that foreign currency. If the U.S. dollar rises in value against a foreign currency, a security denominated in that currency will be worth less in U.S. dollars and if the U.S. dollar decreases in value against a foreign currency, a security denominated in that currency will be worth more in U.S. dollars. The dollar value of foreign investments may also be affected by exchange controls.

The portfolio manager seeks to actively manage foreign currency exposure both to help reduce risk and to seek to enhance return.

Special Risks of Developing and Emerging Markets. The economies of developing or emerging market countries may be more dependent on relatively few industries that may be highly vulnerable to local and global changes. The governments of developing and emerging market countries may also be more unstable than the governments of more developed countries. These countries generally have less developed securities markets or exchanges, and less developed legal and accounting systems. Securities may be more difficult to sell at an acceptable price and may be more volatile than securities in countries with more mature markets. The value of developing or emerging market currencies may fluctuate more than the currencies of countries with more mature markets. Investments in developing or emerging market countries may be subject to greater risks of government restrictions, including confiscatory taxation, expropriation or nationalization of a company's assets, restrictions on foreign ownership of local companies and restrictions on withdrawing assets from the country. Investments in securities of issuers in developing or emerging market countries may be considered speculative.

Governments of some emerging market countries have defaulted on their bonds and there is the risk of this happening in the future.

Main Risks of Debt Securities. Debt securities may be subject to credit risk, interest rate risk, duration risk, prepayment risk, reinvestment risk, extension risk and event risk. Credit risk is the risk that the issuer of a security might not make interest and principal payments on the security as they become due. If an issuer fails to pay interest or repay principal, the Fund's income or share value might be reduced. Adverse news about an issuer or a downgrade in an issuer's credit rating, for any reason, can also reduce the market value of the issuer's securities. Interest rate risk is the risk that when prevailing interest rates fall, the values of already-issued debt securities generally rise; and when prevailing interest rates rise, the values of already-issued debt securities generally fall, and they may be worth less than the amount the Fund paid for them. When interest rates change, the values of longer-term debt securities usually change more than the values of shorter-term debt securities. When interest rates fall, debt securities may be repaid more quickly than expected and the Fund may be required to reinvest the proceeds at a lower interest rate. This is referred to as "prepayment risk." When interest rates fall, the Fund may be required to reinvest the proceeds from a security's sale or redemption at a lower interest rate. This is referred to as "reinvestment risk". When interest rates rise, debt securities may be repaid more slowly than expected and the value of the Fund's holdings may fall sharply. This is referred to as "extension risk." Interest rate changes normally have different effects on variable or floating rate securities than they do on securities with fixed interest rates. Risks associated with rising interest rates are heightened given that interest rates in the U.S. are at, or near, historic lows. Duration risk is the risk that longer-duration debt securities will be more volatile and more likely to decline in price in a rising interest rate environment than shorter-duration debt securities. Event risk is the risk that an issuer could be subject to an event, such as a buyout or debt restructuring, that interferes with its ability to make timely interest and principal payments and cause the value of its debt securities to fall.

Fixed-Income Market Risks. Economic and other market developments can adversely affect fixed-income securities markets in the United States, Europe and elsewhere. At times, participants in debt securities markets may develop concerns about the ability of certain issuers of debt securities to make timely principal and interest payments, or they may develop concerns about the ability of financial institutions that make markets in certain debt securities to facilitate an orderly market. Those concerns can cause increased volatility in those debt securities or debt securities markets. Under some circumstances, as was the case during the latter half of 2008 and early 2009, those concerns could cause reduced liquidity in certain debt securities markets. A lack of liquidity or other adverse credit market conditions may hamper the Fund's ability to sell the debt securities in which it invests or to find and purchase suitable debt instruments.

Special Risks of Below-Investment-Grade Securities. Below-investment-grade debt securities (also referred to as "junk" bonds), whether rated or unrated, may be subject to greater price fluctuations than investment-grade securities, increased credit risk and a greater risk that the issuer might not be able to pay interest and principal when due, especially during times of weakening economic conditions or rising interest rates. The market for below-investment-grade securities may be less liquid and therefore these securities may be harder to value or sell, especially during times of market volatility or decline.

Because the Fund can invest without limit in below-investment-grade securities, the Fund's credit risks are greater than those of funds that buy only investment-grade securities. Credit rating downgrades of a single issuer or related similar issuers whose securities the Fund holds in significant amounts could substantially and unexpectedly increase the Fund's exposure to below-investment-grade securities and the risks associated with them, especially liquidity and default risk.

Risks of Non-Diversification. The Fund is classified as a "non-diversified" fund under the Investment Company Act of 1940. Accordingly, the Fund may invest a greater portion of its assets in the securities of a single issuer than if it were a "diversified" fund. To the extent that the Fund invests a higher percentage of its assets in the securities of a single issuer, the Fund is more subject to the risks associated with and developments affecting that issuer than a fund that invests more widely.

Main Risks of Derivative Investments. Derivatives may involve significant risks. Derivatives may be more volatile than other types of investments, require the payment of premiums, can increase portfolio turnover, may be illiquid, and may not perform as expected. Derivatives are subject to counterparty risk and the Fund may lose money on a derivative investment if the issuer or counterparty fails to pay the amount due. Some derivatives have the potential for unlimited loss, regardless of the size of the Fund's initial investment. As a result of these risks, the Fund could realize little or no income or lose money from its investment, or a hedge might be unsuccessful. In addition, under new rules enacted and currently being implemented under U.S. financial reform legislation, certain over-the-counter derivatives are (or soon will be) required to be executed on a regulated market and cleared through a central clearing house counterparty. It is unclear how these regulatory changes will affect counterparty risk, and entering into a derivative transaction with a central clearing house counterparty may entail further risks and costs.

Main Risks of Leverage. Leverage may be created when an investment exposes the Fund to a risk of loss that exceeds the amount invested. Certain derivatives and other investments provide the potential for investment gain or loss that may be several times than the value of the underlying security, index or other investment.

Who Is the Fund Designed For? The Fund is designed primarily for investors seeking total return over the long term. Those investors should be willing to assume the risks of short-term share price fluctuations and losses of a fund that focuses on debt investments in emerging markets. The Fund is intended to be a long-term investment, not a short-term trading vehicle. Because the Fund's income will fluctuate, it is not designed for investors needing an assured level of current income. The Fund is not a complete investment program. You should carefully consider your own investment goals and risk tolerance before investing in the Fund.

An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

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The price of the Fund's shares can go up and down substantially. The value of the Fund's investments may change because of broad changes in the markets in which the Fund invests or because of poor investment selection, which could cause the Fund to underperform other funds with similar investment objectives. There is no assurance that the Fund will achieve its investment objective. When you redeem your shares, they may be worth more or less than what you paid for them. These risks mean that you can lose money by investing in the Fund.

Risk Not Insured Depository Institution [Text]

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An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Nondiversified Status [Text]

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Risks of Non-Diversification. The Fund is classified as a "non-diversified" fund under the Investment Company Act of 1940. Accordingly, the Fund may invest a greater portion of its assets in the securities of a single issuer than if it were a "diversified" fund. To the extent that the Fund invests a higher percentage of its assets in the securities of a single issuer, the Fund is more subject to the risks associated with and developments affecting that issuer than a fund that invests more widely.

Performance Narrative [Text Block]

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The Fund's Past Performance. The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance (for Class A shares) from calendar year to calendar year and by showing how the Fund's average annual returns for the periods of time shown in the table compare with those of a broad measure of market performance. The Fund's past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. More recent performance information is available by calling the toll-free number on the back of this prospectus and on the Fund's website: https://www.oppenheimerfunds.com/fund/EmergingMarketsDebtFund

The Fund's performance is also compared against that of a reference index (the "Reference Index") that has characteristics of those markets in which the Fund invests. The Reference Index is a customized weighted index comprised of the following underlying broad-based security indices: 70% of the JPMorgan Government Bond Index - Emerging Markets Global Diversified and 30% of the JPMorgan Emerging Markets Bond Index Global Diversified. The Fund is not managed to be invested in the same percentages as those indices comprising the Reference Index and the Fund's holdings may differ significantly from those percentages.

Performance Availability Website Address [Text]

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https://www.oppenheimerfunds.com/fund/EmergingMarketsDebtFund

Performance Past Does Not Indicate Future [Text]

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The Fund's past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Bar Chart Closing [Text Block]

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Sales charges are not included and the returns would be lower if they were. During the period shown, the highest return for a calendar quarter was 7.12% (1st Qtr 2012) and the lowest was -8.33% (3rd Qtr 2011). For the period from January 1, 2013 to June 30, 2013, the cumulative return before sales charges and taxes was -7.88%.

Performance Table Heading

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Average Annual Total Returns for the periods ended December 31, 2012

Performance Table Uses Highest Federal Rate

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After-tax returns are calculated using the highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

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Your actual after-tax returns, depending on your individual tax situation, may differ from those shown and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

Performance Table One Class of after Tax Shown [Text]

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After-tax returns are shown for only one class and after-tax returns for other classes will vary.

Performance Table Narrative

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The following table shows the average annual total returns for each class of the Fund's shares. After-tax returns are calculated using the highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes. Your actual after-tax returns, depending on your individual tax situation, may differ from those shown and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only one class and after-tax returns for other classes will vary.

Performance information for Class I shares will be provided after those shares have one full calendar year of performance.

JPMorgan Government Bond Index - Emerging Markets Global Diversified

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rr_AverageAnnualReturnYear01

16.75%

rr_AverageAnnualReturnYear05

10.48%

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JPMorgan Emerging Markets Bond Index Global Diversified

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rr_AverageAnnualReturnYear01

17.44%

rr_AverageAnnualReturnYear05

12.40%

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Reference Index

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rr_AverageAnnualReturnYear01

17.08%

rr_AverageAnnualReturnYear05

11.15%

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Class A

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

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rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

4.75%

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.75%

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.38%

rr_ExpensesOverAssets

1.38%

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.13%)

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rr_NetExpensesOverAssets

1.25%

rr_ExpenseExampleYear01

597

rr_ExpenseExampleYear03

882

rr_ExpenseExampleYear05

1,187

rr_ExpenseExampleYear10

2,054

rr_ExpenseExampleNoRedemptionYear01

597

rr_ExpenseExampleNoRedemptionYear03

882

rr_ExpenseExampleNoRedemptionYear05

1,187

Year to Date Return, Label

rr_ExpenseExampleNoRedemptionYear10

2,054

Annual Return 2011

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(2.50%)

Annual Return 2012

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17.67%

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For the period from January 1, 2013 to June 30, 2013, the cumulative return before sales charges and taxes was -7.88%

Bar Chart, Year to Date Return, Date

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Jun. 30, 2013

Bar Chart, Year to Date Return

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(7.88%)

Highest Quarterly Return, Label

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highest return for a calendar quarter was 7.12% (1st Qtr 2012)

Highest Quarterly Return, Date

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Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

7.12%

Lowest Quarterly Return, Label

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lowest was -8.33% (3rd Qtr 2011)

Lowest Quarterly Return, Date

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Sep. 30, 2011

Lowest Quarterly Return

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(8.33%)

rr_AverageAnnualReturnYear01

12.08%

rr_AverageAnnualReturnYear05

7.23%

rr_AverageAnnualReturnInceptionDate

Jun. 30, 2010

Class A | Return After Taxes on Distributions

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rr_AverageAnnualReturnYear01

10.03%

rr_AverageAnnualReturnYear05

5.14%

Class A | Return After Taxes on Distributions and Sale of Fund Shares

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rr_AverageAnnualReturnYear01

7.76%

rr_AverageAnnualReturnYear05

4.91%

Class C

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

rr_ManagementFeesOverAssets

0.75%

rr_DistributionAndService12b1FeesOverAssets

1.00%

rr_OtherExpensesOverAssets

0.38%

rr_ExpensesOverAssets

2.13%

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.13%)

^[3]

rr_NetExpensesOverAssets

2.00%

rr_ExpenseExampleYear01

305

rr_ExpenseExampleYear03

661

rr_ExpenseExampleYear05

1,144

rr_ExpenseExampleYear10

2,477

rr_ExpenseExampleNoRedemptionYear01

205

rr_ExpenseExampleNoRedemptionYear03

661

rr_ExpenseExampleNoRedemptionYear05

1,144

rr_ExpenseExampleNoRedemptionYear10

2,477

rr_AverageAnnualReturnYear01

15.92%

rr_AverageAnnualReturnYear05

8.55%

rr_AverageAnnualReturnInceptionDate

Jun. 30, 2010

Class N

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

rr_ManagementFeesOverAssets

0.75%

rr_DistributionAndService12b1FeesOverAssets

0.50%

rr_OtherExpensesOverAssets

0.38%

rr_ExpensesOverAssets

1.63%

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.13%)

^[3]

rr_NetExpensesOverAssets

1.50%

rr_ExpenseExampleYear01

254

rr_ExpenseExampleYear03

505

rr_ExpenseExampleYear05

881

rr_ExpenseExampleYear10

1,937

rr_ExpenseExampleNoRedemptionYear01

154

rr_ExpenseExampleNoRedemptionYear03

505

rr_ExpenseExampleNoRedemptionYear05

881

rr_ExpenseExampleNoRedemptionYear10

1,937

rr_AverageAnnualReturnYear01

16.50%

rr_AverageAnnualReturnYear05

9.11%

rr_AverageAnnualReturnInceptionDate

Jun. 30, 2010

Class Y

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.75%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.38%

rr_ExpensesOverAssets

1.13%

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.18%)

^[3]

rr_NetExpensesOverAssets

0.95%

rr_ExpenseExampleYear01

rr_ExpenseExampleYear03

343

rr_ExpenseExampleYear05

608

rr_ExpenseExampleYear10

1,366

rr_ExpenseExampleNoRedemptionYear01

rr_ExpenseExampleNoRedemptionYear03

343

rr_ExpenseExampleNoRedemptionYear05

608

rr_ExpenseExampleNoRedemptionYear10

1,366

rr_AverageAnnualReturnYear01

18.17%

rr_AverageAnnualReturnYear05

9.66%

rr_AverageAnnualReturnInceptionDate

Jun. 30, 2010

Class I

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_RiskReturnAbstract

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.75%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.19%

rr_ExpensesOverAssets

0.94%

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.09%)

^[3]

rr_NetExpensesOverAssets

0.85%

rr_ExpenseExampleYear01

rr_ExpenseExampleYear03

292

rr_ExpenseExampleYear05

514

rr_ExpenseExampleYear10

1,152

rr_ExpenseExampleNoRedemptionYear01

rr_ExpenseExampleNoRedemptionYear03

292

rr_ExpenseExampleNoRedemptionYear05

514