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 $25,000 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 21 of the prospectus and in the sections "How to Buy Shares" beginning on page 69 and "Appendix A" in 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 your investment)

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

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 59% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

59.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $25,000 in certain funds in the Oppenheimer family of funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

25,000

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

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]

rr_StrategyNarrativeTextBlock

Principal Investment Strategies. The Fund seeks to achieve its investment objective by allocating its assets among equity securities, fixed-income securities, and various other types of investments, from all over the world. The Fund will attempt to take advantage of long- and short-term fluctuations in the global markets by allocating its assets across a variety of asset classes. Such allocations may vary significantly from time to time. The Fund may invest in any market that the portfolio managers believe may offer an attractive investment opportunity. This investment flexibility is intended to allow the Fund to respond to, and seek to benefit from, changes in the global economic, political, and social landscape. The portfolio managers will analyze the overall investment opportunities and risks in the global markets and across asset classes in making investment decisions.

Generally, there are no geographic restrictions on where the Fund may invest and no restrictions on the amount of the Fund's assets that can be invested in either U.S. or foreign securities, including securities of issuers in developing and emerging markets. There is no maximum or minimum amount for investments in either equity or fixed-income securities. The Fund is not required to allocate its investments in any fixed proportion, and at any given time the Fund may allocate up to 100% of its assets in equity, fixed-income, U.S., or foreign securities.

The Fund may invest in all types of equity securities, including common stock, preferred stock, convertible securities, rights and warrants, and other securities or instruments whose prices are linked to the value of common stock. The Fund does not limit its investments to issuers in a particular market capitalization range and at times may invest a substantial portion of its assets in one or more particular market capitalization ranges.

The Fund may invest in debt securities of any kind and of varying duration and maturities. Examples include, but are not limited to, securities that pay a fixed or fluctuating rate of interest, securities convertible into equity securities, securities issued or guaranteed by the U.S. federal and state governments or by their agencies and instrumentalities, securities issued or guaranteed by foreign governments, international agencies or supra-national entities, securities issued or guaranteed by domestic or foreign private issuers, mortgage-backed or other asset-backed securities, inflation-indexed bonds, structured notes, loan assignments and loan participations.

The Fund may invest in below-investment-grade debt securities (commonly referred to as "junk bonds"), including distressed securities. 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 Fund's Sub-Adviser, OppenheimerFunds, Inc., may internally assign ratings to certain of those securities, after assessing their credit quality, in investment-grade or below-investment-grade categories similar to those of nationally recognized statistical rating organizations. There can be no assurance, nor is it intended, that the Sub-Adviser's credit analysis is consistent or comparable with the credit analysis process used by a nationally recognized statistical rating organization.

The portfolio managers may seek to adjust exposures, enhance investment returns, and hedge market risks through the use of short sales and a variety of derivative instruments including, but not limited to, futures, options, forward contracts and swaps. The Fund may invest in the securities of other investment companies, subject to the limits of the Investment Company Act, including other entities sponsored and/or advised by the Manager or an affiliate. In addition, the Fund may invest in other types of investments including, but not limited to, commodity futures, event-linked securities, currency-related investments, real estate-related investments and precious metals-related investments.

The Fund has established a Cayman Islands exempted company that is wholly-owned and controlled by the Fund (the "Subsidiary"). The Fund may invest up to 25% of its total assets in the Subsidiary. The Subsidiary invests primarily in commodity-linked derivatives (including commodity futures, financial futures, options and swap contracts) and exchange traded funds related to gold or other special minerals ("Gold ETFs"). The Subsidiary may also invest in certain fixed-income securities and other investments that may serve as margin or collateral for its derivatives positions. Investments in the Subsidiary are intended to provide the Fund with exposure to commodities market returns within the limitations of the federal tax requirements that apply to the Fund. The Subsidiary is subject to the same investment restrictions and guidelines, and follows the same compliance policies and procedures, as the Fund. The Fund's investment in the Subsidiary may vary based on the portfolio managers' use of different types of commodity-linked derivatives, fixed-income securities, Gold ETFs, and other investments. Since the Fund may invest a substantial portion of its assets in the Subsidiary, which may hold certain of the investments described in this prospectus, the Fund may be considered to be investing indirectly in those investments through its Subsidiary. Therefore, references in this prospectus to investments by the Fund also may be deemed to include the Fund's indirect investments through the Subsidiary.

The Fund's holdings may at times differ significantly from the weightings of the indices comprising its reference index (the "Reference Index"). The Fund's Reference Index is a customized weighted index currently comprised of the following underlying broad-based security indices: 30% of the Russell 1000 Index, 30% of the MSCI All Country World Index (ex-U.S.), 20% of the Barclays Capital Aggregate Bond Index, and 20% of the Barclay's Multiverse Index (ex-U.S.). The Fund is not managed to be invested in the same percentages as those indices comprising the Reference Index.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

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.

Asset Allocation Risk. The Fund's ability to achieve its investment objective depends largely upon the portfolio managers' skill in selecting the best mix of investments. There is the risk that the portfolio managers' evaluations and assumptions regarding the prospects of the global financial markets may be incorrect and the Fund's performance may be adversely affected by their asset allocation decisions.

Market Risk. The value of the securities in which the Fund invests may be affected by changes in the securities markets. Securities markets may experience significant short-term volatility and may fall sharply at times. Different markets may behave differently from each other and U.S. markets may move in the opposite direction from one or more foreign markets.

Main Risks of Investing in Stock. The value of the Fund's portfolio may be affected by changes in the stock markets. Stock markets may experience significant short-term volatility and may fall sharply at times. Different stock markets may behave differently from each other and U.S. stock markets may move in the opposite direction from one or more foreign stock markets.

The prices of individual stocks generally do not all move in the same direction at the same time and a variety of factors can affect the price of a particular company's stock. These factors may include, but are not limited to: poor earnings reports, a loss of customers, litigation against the company, general unfavorable performance of the company's sector or industry, or changes in government regulations affecting the company or its industry.

At times, the Fund may emphasize investments in a particular industry or economic or market sector. To the extent that the Fund increases its emphasis on investments in a particular industry or sector, the value of its investments may fluctuate more in response to events affecting that industry or sector, such as changes in economic conditions, government regulations, availability of basic resources or supplies, or other events that affect that industry or sector more than others.

Main Risks of Small- and Mid-Sized Companies. The stock prices of small- and mid-sized companies may be more volatile and their securities may be more difficult to sell than those of larger companies. They may not have established markets, may have fewer customers and product lines, may have unseasoned management or less management depth and may have more limited access to financial resources. Smaller companies may not pay dividends or provide capital gains for some time, if at all.

Main Risks of Debt Securities. Debt securities may be subject to credit risk, interest rate risk, prepayment 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 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. 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.

Special Risks of Below-Investment-Grade Securities. Below-investment-grade debt securities may be subject to greater price fluctuations and have a greater risk that the issuer might not be able to pay interest and principal when due. The market for below-investment-grade securities may be less liquid and they may be harder to value or to sell at an acceptable price, especially during times of market volatility or decline.

Because the Fund can invest without limit in lower-grade securities, the Fund's credit risks are greater than those of funds that buy only investment-grade securities.

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.

Main 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 for the Fund 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 United States or abroad, expropriation or nationalization of a company's assets, or other political and economic factors. These risks may be greater for investments in developing or emerging market countries.

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.

Main Risks of Alternative Asset Classes. The Fund's investments in asset classes that the portfolio managers expect to perform differently from its equity and fixed-income investments may be volatile or illiquid, particularly during periods of market instability, and they may not provide the expected returns.

Main Risks of Event-Linked Securities. Event-linked securities are fixed income securities for which the return of principal and payment of interest is contingent on the non-occurrence of a trigger event, such as a hurricane, earthquake, or other event that leads to physical or economic loss. If the trigger event occurs prior to maturity, the Fund may lose all or a portion of its principal and additional interest. Event-linked securities may expose the Fund to certain other risks, including issuer default, adverse regulatory or jurisdictional interpretations, liquidity risk and adverse tax consequences.

Main Risks of Derivative Investments. Derivatives may involve significant risks. Some derivatives have the potential for unlimited loss, regardless of the size of the Fund's initial investment. Derivatives may be illiquid and may be more volatile than other types of investments. Derivative investments can increase portfolio turnover and transaction costs. Derivatives are subject to counter-party credit risk and may lose money if the issuer fails to pay the amounts due.

Main Risks of Hedging. The Fund may engage in "hedging" strategies, including short sales, futures and other derivatives in an effort to protect assets from losses due to declines in the value of the Fund's portfolio. There are risks in the use of these investment and trading strategies. There can be no assurance that the hedging strategies used will be successful in avoiding losses, and hedged positions may perform less favorably in generally rising markets than unhedged positions. If the Sub-Adviser uses a hedging strategy at the wrong time or judges market conditions incorrectly, the strategy could reduce the Fund's return. In some cases, derivatives or other investments may be unavailable, or the Sub-Adviser may choose not to use them under market conditions when their use, in hindsight, may be determined to have been beneficial to the Fund. No assurance can be given that the Sub-Adviser will employ hedging strategies with respect to all or any portion of the Fund's assets.

Main Risks of Commodity-Linked Investments. Commodity-linked investments are considered speculative and have substantial risks, including the risk of loss of a significant portion of their principal value. Prices of commodities and commodity-linked investments may fluctuate significantly over short periods due to a variety of factors, including for example agricultural, economic and regulatory developments. These risks may make commodity-linked investments more volatile than other types of investments.

Main Risks Of Investments In The Fund's Wholly-Owned Subsidiary. The Subsidiary is not registered under the Investment Company Act of 1940 and is not subject to its investor protections (except as otherwise noted in this prospectus). As an investor in the Subsidiary, the Fund does not have all of the protections offered to investors by the Investment Company Act of 1940. However, the Subsidiary is wholly-owned and controlled by the Fund and managed by the Manager. Therefore, the Fund's ownership and control of the Subsidiary make it unlikely that the Subsidiary would take actions contrary to the interests of the Fund or its shareholders.

Changes in the laws of the Cayman Islands (where the Subsidiary is organized) could prevent the Subsidiary from operating as described in this prospectus and could negatively affect the Fund and its shareholders. For example, the Cayman Islands currently does not impose certain taxes on exempted companies like the Subsidiary, including income and capital gains tax, among others. If Cayman Islands laws were changed to require such entities to pay Cayman Islands taxes, the investment returns of the Fund would likely decrease.

Who is the Fund Designed For? The Fund is designed for investors seeking a combination of growth of capital and investment income, with a primary objective of growth of capital. Those investors should be willing to assume the risks of short-term share price fluctuations that are typical for a fund with significant investments in foreign and domestic equity and fixed-income securities and alternative asset classes. 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.

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]

rr_RiskLoseMoney

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]

rr_RiskNotInsuredDepositoryInstitution

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.

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

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 year to year and by showing how the Fund's average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance and those of the Reference Index, which has characteristics of those markets in which the Fund can invest. 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/GlobalAllocationFund

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

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

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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]

rr_BarChartClosingTextBlock

Sales charges and taxes are not included and the returns would be lower if they were. During the period shown, the highest return for a calendar quarter was 19.00% (2nd Qtr 09) and the lowest return was -14.38% (4th Qtr 08). For the period from January 1, 2012 to December 31, 2012, the cumulative return before sales charges and taxes was 10.17%.

Performance Table Heading

rr_PerformanceTableHeading

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

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

rr_PerformanceTableNotRelevantToTaxDeferred

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]

rr_PerformanceTableOneClassOfAfterTaxShown

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

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

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.

(Oppenheimer Global Allocation Fund) | S&P 500 Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.00%

5 Years

rr_AverageAnnualReturnYear05

1.66%

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

7.10%

(Oppenheimer Global Allocation Fund) | Reference Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

11.81%

5 Years

rr_AverageAnnualReturnYear05

2.66%

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

(Oppenheimer Global Allocation Fund) | Russell 1000 Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.42%

5 Years

rr_AverageAnnualReturnYear05

1.92%

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

7.52%

(Oppenheimer Global Allocation Fund) | MSCI All Country World Index (ex-U.S.)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.83%

5 Years

rr_AverageAnnualReturnYear05

(2.89%)

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

9.74%

(Oppenheimer Global Allocation Fund) | Barclays Multiverse Index (ex-U.S.)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.36%

5 Years

rr_AverageAnnualReturnYear05

4.92%

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

(Oppenheimer Global Allocation Fund) | Barclays Capital Aggregate Bond Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.22%

5 Years

rr_AverageAnnualReturnYear05

5.95%

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

5.18%

(Oppenheimer Global Allocation Fund) | Class A

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.79%

^[1]

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses of the Fund

rr_Component1OtherExpensesOverAssets

0.35%

Other Expenses of the Subsidiary

rr_Component2OtherExpensesOverAssets

none

Total Other Expenses

rr_OtherExpensesOverAssets

0.35%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.08%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.47%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[2]

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

rr_NetExpensesOverAssets

1.39%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

709

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,009

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,330

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,237

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

709

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

1,009

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,330

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,237

Annual Return 2003

rr_AnnualReturn2003

30.56%

Annual Return 2004

rr_AnnualReturn2004

10.29%

Annual Return 2005

rr_AnnualReturn2005

2.76%

Annual Return 2006

rr_AnnualReturn2006

10.66%

Annual Return 2007

rr_AnnualReturn2007

(3.88%)

Annual Return 2008

rr_AnnualReturn2008

(31.64%)

Annual Return 2009

rr_AnnualReturn2009

32.72%

Annual Return 2010

rr_AnnualReturn2010

13.42%

Annual Return 2011

rr_AnnualReturn2011

(7.77%)

Annual Return 2012

rr_AnnualReturn2012

10.17%

Year to Date Return, Label

rr_YearToDateReturnLabel

For the period from January 1, 2012 to December 31, 2012, the cumulative return before sales charges and taxes was 10.17%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Dec. 31, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

10.17%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest return for a calendar quarter was 19.00% (2nd Qtr 09)

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

19.00%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest return was -14.38% (4th Qtr 08)

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(14.38%)

1 Year

rr_AverageAnnualReturnYear01

3.84%

5 Years

rr_AverageAnnualReturnYear05

(0.29%)

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

4.49%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 01, 1991

(Oppenheimer Global Allocation Fund) | Class A | Return After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.46%

5 Years

rr_AverageAnnualReturnYear05

(0.67%)

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

3.72%

(Oppenheimer Global Allocation Fund) | Class A | Return After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.49%

5 Years

rr_AverageAnnualReturnYear05

(0.39%)

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

3.61%

(Oppenheimer Global Allocation Fund) | Class B

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOther

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.79%

^[1]

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses of the Fund

rr_Component1OtherExpensesOverAssets

0.55%

Other Expenses of the Subsidiary

rr_Component2OtherExpensesOverAssets

none

Total Other Expenses

rr_OtherExpensesOverAssets

0.55%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.08%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.42%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.21%)

^[2]

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

rr_NetExpensesOverAssets

2.21%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

727

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,043

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,487

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,311

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

227

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

743

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,287

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,311

1 Year

rr_AverageAnnualReturnYear01

4.22%

5 Years

rr_AverageAnnualReturnYear05

(0.31%)

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

4.62%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 01, 1993

(Oppenheimer Global Allocation Fund) | Class C

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.79%

^[1]

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses of the Fund

rr_Component1OtherExpensesOverAssets

0.31%

Other Expenses of the Subsidiary

rr_Component2OtherExpensesOverAssets

none

Total Other Expenses

rr_OtherExpensesOverAssets

0.31%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.08%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.18%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[2]

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

rr_NetExpensesOverAssets

2.10%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

315

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

682

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,175

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,534

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

215

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

682

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,175

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,534

1 Year

rr_AverageAnnualReturnYear01

8.33%

5 Years

rr_AverageAnnualReturnYear05

0.16%

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

4.35%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 01, 1993

(Oppenheimer Global Allocation Fund) | Class I

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.79%

^[1]

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses of the Fund

rr_Component1OtherExpensesOverAssets

0.08%

Other Expenses of the Subsidiary

rr_Component2OtherExpensesOverAssets

none

Total Other Expenses

rr_OtherExpensesOverAssets

0.08%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.08%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.95%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[2]

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

rr_NetExpensesOverAssets

0.87%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

296

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

520

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,164

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

296

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

520

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,164

(Oppenheimer Global Allocation Fund) | Class N

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.79%

^[1]

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses of the Fund

rr_Component1OtherExpensesOverAssets

0.34%

Other Expenses of the Subsidiary

rr_Component2OtherExpensesOverAssets

none

Total Other Expenses

rr_OtherExpensesOverAssets

0.34%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.08%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.71%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[2]

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

rr_NetExpensesOverAssets

1.63%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

267

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

535

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

928

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,030

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

167

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

535

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

928

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,030

1 Year

rr_AverageAnnualReturnYear01

8.90%

5 Years

rr_AverageAnnualReturnYear05

0.66%

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

4.82%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2001

(Oppenheimer Global Allocation Fund) | Class Y

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.79%

^[1]

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses of the Fund

rr_Component1OtherExpensesOverAssets

0.23%

Other Expenses of the Subsidiary

rr_Component2OtherExpensesOverAssets

none

Total Other Expenses

rr_OtherExpensesOverAssets

0.23%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.08%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.10%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[2]

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

rr_NetExpensesOverAssets

1.02%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

105

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

344

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

602

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,340

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

105

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

344

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

602

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,340

1 Year

rr_AverageAnnualReturnYear01

10.50%

5 Years

rr_AverageAnnualReturnYear05

1.28%

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

5.47%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 01, 2000

(Oppenheimer Small- & Mid- Cap Value Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Investment Objective. The Fund seeks capital appreciation.

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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 $25,000 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 10 of the prospectus and in the sections "How to Buy Shares" beginning on page 56 and "Appendix A" in 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 [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

54.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $25,000 in certain funds in the Oppenheimer family of funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

25,000

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

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]

rr_StrategyNarrativeTextBlock

Principal Investment Strategies. The Fund mainly invests in common stocks of U.S. companies that have a market capitalization up to $13 billion. That range includes both small- and mid-cap stocks. The Fund has no fixed ratio for the percentage of small-cap and mid-cap stocks required to be held in its portfolio. Under normal market conditions the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities of small-cap and mid-cap issuers.

The Fund primarily invests in U.S. companies but may also purchase securities of issuers in any country, including developed and emerging market countries. While the Fund has no limits on the percentage of its assets it can invest in foreign securities, normally it does not expect to invest substantial amounts of its assets in foreign securities and generally limits investments in emerging markets to not more than 5% of its total assets. The Fund emphasizes securities that the portfolio manager believes are undervalued.

In selecting investments for the Fund, the portfolio manager looks for stocks of small- and mid-cap companies that he believes have been undervalued by the market. A security may be undervalued because the market is not aware of the issuer's intrinsic value, does not yet recognize its future potential, or the issuer may be temporarily out of favor. The Fund seeks to realize gains in the prices of those securities when other investors recognize their real or prospective worth. The portfolio manager uses a "bottom up" approach to select securities one at a time before considering industry trends. Those companies may have a low ratio of their stock price to earnings, for example. The portfolio manager also analyzes factors such as a company's book value, sales, earnings, growth potential and cash flows. After considering these criteria, the portfolio manager may also look at broader industry and economic trends that could affect the growth potential of particular small- and mid-cap stocks. The portfolio manager currently focuses on companies with the following characteristics, which may vary in particular cases and may change over time:

Favorable supply/demand conditions for key products
Development of new products or businesses
Quality of management
Competitive position in the marketplace
Effective allocation of capital

The Fund may sell securities that the portfolio manager believes no longer meet the above criteria, but is not required to do so.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

At times, the Fund may emphasize investments in a particular industry or market sector. To the extent that it increases its emphasis on a particular industry or sector, the value of its investments may fluctuate more in response to events (such as changes in economic conditions, government regulations, or the availability of basic resources or supplies) that affect that particular industry or sector more than others.

Main Risks of Value Investing. Value investing entails the risk that if the market does not recognize that the Fund's securities are undervalued, the prices of those securities might not appreciate as anticipated. A value approach could also result in fewer investments that increase rapidly during times of market gains and could cause the Fund to underperform funds that use a growth or non-value approach to investing. Value investing has gone in and out of favor during past market cycles and when value investing is out of favor or when markets are unstable, the securities of "value" companies may underperform the securities of "growth" companies.

The Fund can invest up to 5% of its total assets in securities of small, unseasoned companies.

Price Arbitrage. Because the Fund may invest in smaller company stocks that might trade infrequently, investors might seek to trade fund shares based on their knowledge or understanding of the value of those securities (this is sometimes referred to as "price arbitrage"). If such price arbitrage were successful, it might interfere with the efficient management of the Fund's portfolio and the Fund may be required to sell securities at disadvantageous times or prices to satisfy the liquidity requirements created by that activity. Successful price arbitrage might also dilute the value of fund shares held by other shareholders.

Who Is the Fund Designed For? The Fund is designed primarily for investors seeking capital appreciation over the long term. Those investors should be willing to assume the risks of short-term share price fluctuations and losses that are typical for funds emphasizing small- and mid-cap stock investments. Since the Fund does not seek current income and its income from investments will likely be small, it is not designed for investors needing an assured level of current income. The Fund is not a complete investment program and may not be appropriate for all investors. 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]

rr_RiskLoseMoney

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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.

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

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 year to year and by showing how the Fund's average annual returns for 1, 5 and 10 years 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/SmallMidCapValueFund

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

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

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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]

rr_BarChartClosingTextBlock

Sales charges and taxes are not included and the returns would be lower if they were. During the period shown, the highest return for a calendar quarter was 23.11% (2nd Qtr 09) and the lowest return was -31.17% (4th Qtr 08). For the period from January 1, 2012 through December 31, 2012 the cumulative return before sales charges and taxes was 9.48%.

Performance Table Heading

rr_PerformanceTableHeading

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

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

rr_PerformanceTableNotRelevantToTaxDeferred

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

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

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

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

(Oppenheimer Small- & Mid- Cap Value Fund) | Russell 2000® Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.35%

5 Years

rr_AverageAnnualReturnYear05

3.56%

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

9.72%

(Oppenheimer Small- & Mid- Cap Value Fund) | Russell 2500® Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

17.88%

5 Years

rr_AverageAnnualReturnYear05

4.34%

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

10.49%

(Oppenheimer Small- & Mid- Cap Value Fund) | Russell 2500® Value Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

19.21%

5 Years

rr_AverageAnnualReturnYear05

4.54%

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

10.20%

(Oppenheimer Small- & Mid- Cap Value Fund) | Class A

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.68%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Total Other Expenses

rr_OtherExpensesOverAssets

0.38%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.31%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[3]

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

rr_NetExpensesOverAssets

1.26%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

697

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

964

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,252

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,069

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

697

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

964

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,252

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,069

Annual Return 2002

rr_AnnualReturn2002

(10.52%)

Annual Return 2003

rr_AnnualReturn2003

46.06%

Annual Return 2004

rr_AnnualReturn2004

28.30%

Annual Return 2005

rr_AnnualReturn2005

11.73%

Annual Return 2006

rr_AnnualReturn2006

17.98%

Annual Return 2007

rr_AnnualReturn2007

9.13%

Annual Return 2008

rr_AnnualReturn2008

(49.93%)

Annual Return 2009

rr_AnnualReturn2009

44.61%

Annual Return 2010

rr_AnnualReturn2010

20.54%

Annual Return 2011

rr_AnnualReturn2011

(7.52%)

Annual Return 2012

rr_AnnualReturn2012

9.48%

Year to Date Return, Label

rr_YearToDateReturnLabel

For the period from January 1, 2012 through December 31, 2012 the cumulative return before sales charges and taxes was 9.48%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Dec. 31, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

9.48%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest return for a calendar quarter was 23.11% (2nd Qtr 09)

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

23.11%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest return was -31.17% (4th Qtr 08)

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(31.17%)

1 Year

rr_AverageAnnualReturnYear01

3.19%

5 Years

rr_AverageAnnualReturnYear05

(3.59%)

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

8.42%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jan. 03, 1989

(Oppenheimer Small- & Mid- Cap Value Fund) | Class A | Return After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.16%

5 Years

rr_AverageAnnualReturnYear05

(3.60%)

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

7.49%

(Oppenheimer Small- & Mid- Cap Value Fund) | Class A | Return After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.07%

5 Years

rr_AverageAnnualReturnYear05

(3.02%)

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

7.04%

(Oppenheimer Small- & Mid- Cap Value Fund) | Class B

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOther

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.68%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Total Other Expenses

rr_OtherExpensesOverAssets

0.69%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.37%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.28%)

^[3]

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

rr_NetExpensesOverAssets

2.09%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

714

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,021

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,454

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,197

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

214

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

721

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,254

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,197

1 Year

rr_AverageAnnualReturnYear01

3.57%

5 Years

rr_AverageAnnualReturnYear05

(3.62%)

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

8.54%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 01, 1993

(Oppenheimer Small- & Mid- Cap Value Fund) | Class C

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.68%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Total Other Expenses

rr_OtherExpensesOverAssets

0.40%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.08%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.02%)

^[3]

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

rr_NetExpensesOverAssets

2.06%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

311

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

657

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,128

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,434

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

211

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

657

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,128

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,434

1 Year

rr_AverageAnnualReturnYear01

7.59%

5 Years

rr_AverageAnnualReturnYear05

(3.19%)

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

8.22%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 01, 1993

(Oppenheimer Small- & Mid- Cap Value Fund) | Class I

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.68%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Total Other Expenses

rr_OtherExpensesOverAssets

0.06%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.74%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

none

^[3]

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

rr_NetExpensesOverAssets

0.74%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

237

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

413

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

922

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

237

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

413

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

922

(Oppenheimer Small- & Mid- Cap Value Fund) | Class N

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.68%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Total Other Expenses

rr_OtherExpensesOverAssets

0.41%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.59%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.04%)

^[3]

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

rr_NetExpensesOverAssets

1.55%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

259

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

502

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

869

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,901

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

159

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

502

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

869

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,901

1 Year

rr_AverageAnnualReturnYear01

8.19%

5 Years

rr_AverageAnnualReturnYear05

(2.71%)

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

8.72%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2001

(Oppenheimer Small- & Mid- Cap Value Fund) | Class Y

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.68%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Total Other Expenses

rr_OtherExpensesOverAssets

0.24%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.92%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

none

^[3]

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

rr_NetExpensesOverAssets

0.92%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

295

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

512

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,136

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

295

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

512

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,136

1 Year

rr_AverageAnnualReturnYear01

9.80%

5 Years

rr_AverageAnnualReturnYear05

(2.10%)

10 Years (or life of class, if less)

rr_AverageAnnualReturnYear10

2.84%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 24, 2005