485BPOS

Registration No. 333-212291
File No. 811-23163

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	☒
Pre­Effective Amendment No.	□
Post­Effective Amendment No. 4	☒

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	☒
Amendment No. 4	☒

Oppenheimer International Growth and Income Fund
(Exact Name of Registrant as Specified in Charter)

6803 South Tucson Way, Centennial, Colorado 80112-3924
(Address of Principal Executive Offices) (Zip Code)

(303) 768-3200

(Registrant’s Telephone Number, including Area Code)

Cynthia Lo Bessette, Esq.

OFI Global Asset Management, Inc.

225 Liberty Street, New York, New York 10281-1008
(Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box):

☒ immediately upon filing pursuant to paragraph (b)

□ on  pursuant to paragraph (b)

□ 60 days after filing pursuant to paragraph (a)(1)

□ on pursuant to paragraph (a)(1)

□ 75 days after filing pursuant to paragraph (a)(2)

□ on pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

□ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all the requirements for effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York and State of New York on the 11th day of October, 2018.

	Oppenheimer International Growth and Income Fund
By:	Arthur P. Steinmetz*
	Arthur P. Steinmetz Trustee, President and Principal Executive Officer

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities on the dates indicated:

Signatures	Title	Date
Brian F. Wruble*Brian F. Wruble	Chairman of the Board of Trustees	October 11, 2018
Arthur P. Steinmetz*Arthur P. Steinmetz	Trustee, President and Principal Executive Officer	October 11, 2018
Brian S. Petersen*Brian S. Petersen	Treasurer, Principal Financial & Accounting Officer	October 11, 2018
Beth Ann Brown*Beth Ann Brown	Trustee	October 11, 2018
Edmund P. Giambastiani, Jr.*Edmund P. Giambastiani, Jr.	Trustee	October 11, 2018
Elizabeth Krentzman*Elizabeth Krentzman	Trustee	October 11, 2018
Mary F. Miller*Mary F. Miller	Trustee	October 11, 2018
Joel W. Motley*Joel W. Motley	Trustee	October 11, 2018
Joanne Pace*Joanne Pace	Trustee	October 11, 2018
Daniel S. Vandivort*Daniel S. Vandivort	Trustee	October 11, 2018
*By: /s/ Taylor V. EdwardsTaylor V. Edwards, Attorney-in-Fact

EXHIBIT INDEX

Exhibit No.	Description
Ex-101.INS	XBRL Instance Document
Ex-101.SCH	XBRL Taxonomy Extension Schema Document
Ex-101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
Ex-101.DEF	XBRL Taxonomy Extension Definition Linkbase
Ex-101.LAB	XBRL Taxonomy Extension Labels Linkbase
Ex-101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	May 31, 2018
Registrant Name	dei_EntityRegistrantName	Oppenheimer International Growth & Income Fund
Central Index Key	dei_EntityCentralIndexKey	0001678241
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Sep. 26, 2018
Document Effective Date	dei_DocumentEffectiveDate	Sep. 27, 2018
Prospectus Date	rr_ProspectusDate	Sep. 27, 2018

XML

Oppenheimer International Growth & Income Fund

<b>The Fund Summary</b>

<b>Investment Objective.</b>

The Fund seeks total return.

<b>Fees and Expenses of the Fund.</b>

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 and sales charge waivers is available from your financial professional and in the section “About Your Account” beginning on page 14 of the prospectus, in the appendix to the prospectus titled “Special Sales Charge Arrangements and Waivers” and in the section “How to Buy Shares” beginning on page 49 in the Fund’s Statement of Additional Information.

<b>Shareholder Fees</b><br/>(fees paid directly from your investment)

Shareholder Fees - Oppenheimer International Growth & Income Fund	Class A	Class C	Class R	Class Y	Class I
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	5.75%	none	none	none	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none	1.00%	none	none	none

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

Annual Fund Operating Expenses - Oppenheimer International Growth & Income Fund		Class A	Class C	Class R	Class Y	Class I
Management Fees	[1]	0.85%	0.85%	0.85%	0.85%	0.85%
Distribution and/or Service (12b-1) Fees	[1]	0.25%	1.00%	0.50%	none	none
Other Expenses	[1]	1.35%	1.70%	2.18%	1.27%	1.23%
Total Annual Fund Operating Expenses	[1]	2.45%	3.55%	3.53%	2.12%	2.08%
Fee Waiver and/or Expense Reimbursement	[1],[2]	(1.20%)	(1.55%)	(2.03%)	(1.12%)	(1.18%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	[1]	1.25%	2.00%	1.50%	1.00%	0.90%

<b>Example.</b>

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 and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Any applicable fee waivers and/or expense reimbursements are reflected in the below examples for the first year only. Although your actual costs may be higher or lower, based on these assumptions your expenses would be as follows:

<b>If shares are redeemed</b>

Expense Example - Oppenheimer International Growth & Income Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Class A	696	1,193	1,716	3,145
Class C	305	960	1,737	3,781
Class R	154	908	1,685	3,729
Class Y	103	561	1,046	2,387
Class I	92	543	1,020	2,340

<b>If shares are not redeemed</b>

Expense Example, No Redemption - Oppenheimer International Growth & Income Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Class A	696	1,193	1,716	3,145
Class C	205	960	1,737	3,781
Class R	154	908	1,685	3,729
Class Y	103	561	1,046	2,387
Class I	92	543	1,020	2,340

<b>Portfolio Turnover. </b>

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 15% of the average value of its portfolio.

<b>Principal Investment Strategies.</b>

The Fund mainly invests in the common stock of growth companies that are domiciled or have their primary operations outside of the United States and are currently paying dividends or are expected to begin paying dividends in the future. It may invest 100% of its assets in securities of foreign companies. The Fund may invest in emerging markets as well as in developed markets throughout the world. From time to time it may place greater emphasis on investing in one or more particular regions such as Asia, Europe or Latin America. Under normal market conditions the Fund will:

• invest at least 65% of its total assets in common and preferred stocks of issuers in at least three different countries outside of the United States, and

• emphasize investments in common stocks of issuers with the potential for growth and steady income.

The Fund does not limit its investments to issuers within a specific market capitalization range and at times may invest a substantial portion of its assets in one or more particular capitalization ranges. The Fund can also buy securities convertible into common stock and other securities having equity features.

          In selecting investments for the Fund’s portfolio, the portfolio manager evaluates investment opportunities on a company-by-company basis. The portfolio manager looks primarily for foreign companies with high growth potential using a “bottom up” investment approach, that is, by looking at the investment performance of individual stocks before considering the impact of general or industry-specific economic trends. This approach includes fundamental analysis of a company’s financial statements and management structure and consideration of the company’s operations, product development, and industry position.

The portfolio manager currently focuses on the following factors, which may vary in particular cases and may change over time:

• companies that enjoy a strong competitive position and high demand for their products or services;

• companies with accelerating earnings growth and cash flow; and

• diversity among companies, industries and countries to help reduce the risks of foreign investing, such as currency fluctuations and stock market volatility.

Thereafter, the portfolio manager focuses on the long-term balance between dividend yield, dividend growth and the safety of the dividend payments.

The portfolio manager also considers the effect of worldwide trends on the growth of particular business sectors and looks for companies that may benefit from those trends. The trends currently considered include: mass affluence, new technologies, restructuring and aging. The portfolio manager does not invest any fixed amount of the Fund’s assets according to these criteria and the trends that are considered may change over time. The portfolio manager monitors individual issuers for changes in the factors above, which may trigger a decision to sell a security, but does not require a decision to do so.

<b>Principal Risks.</b>

The price of the Fund’s shares can go up and down substantially. The value of the Fund’s investments may fall due to adverse 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 less than what you paid for them. These risks mean that you can lose money by investing in the Fund.

Risks of Investing in Stocks. 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. Adverse events in any part of the equity or fixed-income markets may have unexpected negative effects on other market segments. 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. A variety of factors can negatively 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. To the extent that securities of a particular type are emphasized (for example foreign stocks, stocks of small- or mid-cap companies, growth or value stocks, or stocks of companies in a particular industry), fund share values may fluctuate more in response to events affecting the market for those types of securities.

Industry and Sector Focus. At times the Fund may increase the relative emphasis of its investments in a particular industry or sector. The prices of stocks of issuers in a particular industry or sector may go up and down in response to changes in economic conditions, government regulations, availability of basic resources or supplies, or other events that affect that industry or sector more than others. To the extent that the Fund increases the relative emphasis of its investments in a particular industry or sector, its share values may fluctuate in response to events affecting that industry or sector. To some extent that risk may be limited by the Fund’s policy of not concentrating its investments in any one industry.

Dividend Risk. There is no guarantee that the issuers of the stocks held by the Fund will declare dividends in the future or that, if dividends are declared, they will remain at their current levels or increase over time. Depending on market conditions, dividend paying stocks that also meet the Fund’s investment criteria may not be widely available for purchase by the Fund. This may increase the volatility of the Fund’s returns and may limit the ability of the Fund to produce current income while remaining fully diversified. High-dividend stocks may not experience high earnings growth or capital appreciation. The Fund’s performance during a broad market advance could suffer because dividend paying stocks may not experience the same capital appreciation as non-dividend paying stocks.

Risks of Foreign Investing. Foreign securities are subject to special risks. Securities traded in foreign markets may be less liquid and more volatile than those traded in U.S. markets. 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 investments denominated in that foreign currency and in the value of any income or distributions the Fund may receive on those investments. 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. In addition, due to the inter-relationship of global economies and financial markets, changes in political and economic factors in one country or region could adversely affect conditions in another country or region. Investments in foreign securities may also expose the Fund to time-zone arbitrage risk. Foreign securities may trade on weekends or other days when the Fund does not price its shares. As a result, the value of the Fund’s net assets may change on days when you will not be able to purchase or redeem the Fund’s shares. At times, the Fund may emphasize investments in a particular country or region and may be subject to greater risks from adverse events that occur in that country or region. Foreign securities and foreign currencies held in foreign banks and securities depositories may be subject to only limited or no regulatory oversight.

          Eurozone Investment Risks. Certain of the regions in which the Fund may invest, including the European Union (EU), currently experience significant financial difficulties. Following the global economic crisis that began in 2008, some of these countries have depended on, and may continue to be dependent on, the assistance from others such as the European Central Bank (ECB) or other governments or institutions, and failure to implement reforms as a condition of assistance could have a significant adverse effect on the value of investments in those and other European countries. In addition, countries that have adopted the euro are subject to fiscal and monetary controls that could limit the ability to implement their own economic policies, and could voluntarily abandon, or be forced out of, the euro. Such events could impact the market values of Eurozone and various other securities and currencies, cause redenomination of certain securities into less valuable local currencies, and create more volatile and illiquid markets. Additionally, the United Kingdom’s intended departure from the EU, commonly known as “Brexit,” may have significant political and financial consequences for Eurozone markets, including greater market volatility and illiquidity, currency fluctuations, deterioration in economic activity, a decrease in business confidence and an increased likelihood of a recession in the United Kingdom.

          Risks of Developing and Emerging Markets. Investments in developing and emerging markets are subject to all the risks associated with foreign investing, however, these risks may be magnified in developing and emerging markets. Developing or emerging market countries may have less well-developed securities markets and exchanges that may be substantially less liquid than those of more developed markets. Settlement procedures in developing or emerging markets may differ from those of more established securities markets, and settlement delays may result in the inability to invest assets or to dispose of portfolio securities in a timely manner. Securities prices in developing or emerging markets may be significantly more volatile than is the case in more developed nations of the world, and governments of developing or emerging market countries may also be more unstable than the governments of more developed countries. Such countries’ economies may be more dependent on relatively few industries or investors that may be highly vulnerable to local and global changes. Developing or emerging market countries also may be subject to social, political or economic instability. The value of developing or emerging market countries’ 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, restrictions on withdrawing assets from the country, protectionist measures, and practices such as share blocking. In addition, the ability of foreign entities to participate in privatization programs of certain developing or emerging market countries may be limited by local law. Investments in securities of issuers in developing or emerging market countries may be considered speculative.

Risks of Small- and Mid-Cap Companies. Small-cap companies may be either established or newer companies, including “unseasoned” companies that have typically been in operation for less than three years. Mid-cap companies are generally companies that have completed their initial start-up cycle, and in many cases have established markets and developed seasoned market teams. While smaller companies might offer greater opportunities for gain than larger companies, they also may involve greater risk of loss. They may be more sensitive to changes in a company’s earnings expectations and may experience more abrupt and erratic price movements. Small- and mid-cap companies’ securities may trade in lower volumes and it might be harder for the Fund to dispose of its holdings at an acceptable price when it wants to sell them. Small- and mid-cap companies may not have established markets for their products or services and may have fewer customers and product lines. They may have more limited access to financial resources and may not have the financial strength to sustain them through business downturns or adverse market conditions. Since small- and mid-cap companies typically reinvest a high proportion of their earnings in their business, they may not pay dividends for some time, particularly if they are newer companies. Small- and mid-cap companies may have unseasoned management or less depth in management skill than larger, more established companies. They may be more reliant on the efforts of particular members of their management team and management changes may pose a greater risk to the success of the business. It may take a substantial period of time before the Fund realizes a gain on an investment in a small- or mid-cap company, if it realizes any gain at all.

Risks of Growth Investing. If a growth company’s earnings or stock price fails to increase as anticipated, or if its business plans do not produce the expected results, its securities may decline sharply. Growth companies may be newer or smaller companies that may experience greater stock price fluctuations and risks of loss than larger, more established companies. Newer growth companies tend to retain a large part of their earnings for research, development or investments in capital assets. Therefore, they may not pay any dividends for some time. Growth investing has gone in and out of favor during past market cycles and is likely to continue to do so. During periods when growth investing is out of favor or when markets are unstable, it may be more difficult to sell growth company securities at an acceptable price. Growth stocks may also be more volatile than other securities because of investor speculation.

Who Is The Fund Designed For? The Fund is designed primarily for investors seeking total return with an emphasis on growth while providing current income. Those investors should be willing to assume the greater risks of share price fluctuations that are typical for an aggressive fund focusing on growth stock investments while identifying issuers with higher income potential, and the special risks of investing in both developed and emerging foreign countries. 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.

<b>The Fund’s Past Performance.</b>

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. Sales charges and taxes are not reflected in the bar chart and if those charges were included, returns would be less than those shown. 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/InternationalGrowthAndIncomeFund

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 7.84% (1st Qtr 17) and the lowest return for a calendar quarter was 0.93% (4th Qtr 17). For the period from January 1, 2018 to June 30, 2018 the return before sales charges and taxes was -8.16%.

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.

<b>Average Annual Total Returns</b> for the periods ended December 31, 2017

Average Annual Total Returns - Oppenheimer International Growth & Income Fund	1 Year	5 Years (or life of class, if less)		Inception Date
Class A Shares	10.25%	9.43%		Oct. 28, 2016
Class A Shares | Return After Taxes on Distributions	9.18%	8.48%		Oct. 28, 2016
Class A Shares | Return After Taxes on Distributions and Sale of Fund Shares	5.85%	6.80%		Oct. 28, 2016
Class C Shares	15.04%	14.20%		Oct. 28, 2016
Class R Shares	16.57%	14.70%		Oct. 28, 2016
Class Y Shares	17.22%	15.33%		Oct. 28, 2016
Class I Shares	17.41%	15.50%		Oct. 28, 2016
MSCI EAFE Index (reflects no deduction for fees, expenses, or taxes)	25.03%	22.36%	[1]

[1] Expenses have been restated to reflect current fees.

[2] After discussions with the Fund’s Board, the Manager has contractually agreed to waive fees and/or reimburse the Fund for certain expenses in order to limit “Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement” (excluding any applicable dividend expense, taxes, interest and fees from borrowing, any subsidiary expenses, Acquired Fund Fees and Expenses, brokerage commissions, unusual and infrequent expenses and certain other Fund expenses) to annual rates of 1.25% for Class A shares, 2.00% for Class C shares, 1.50% for Class R shares, 1.00% for Class Y shares and 0.90% for Class I shares, as calculated on the daily net assets of the Fund. These fee waivers and/or expense reimbursements may not be amended or withdrawn for one year from the date of this prospectus, unless approved by the Board.

[1] From 10/28/16

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Oppenheimer International Growth & Income Fund
Prospectus Date	rr_ProspectusDate	Sep. 27, 2018
Oppenheimer International Growth & Income Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	<b>The Fund Summary</b>
Objective [Heading]	rr_ObjectiveHeading	<b>Investment Objective.</b>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks total return.
Expense [Heading]	rr_ExpenseHeading	<b>Fees and Expenses of the Fund.</b>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	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 and sales charge waivers is available from your financial professional and in the section “About Your Account” beginning on page 14 of the prospectus, in the appendix to the prospectus titled “Special Sales Charge Arrangements and Waivers” and in the section “How to Buy Shares” beginning on page 49 in the Fund’s Statement of Additional Information.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<b>Shareholder Fees</b><br/>(fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<b>Annual Fund Operating Expenses</b><br/>(expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	one year from the date of this prospectus
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<b>Portfolio Turnover. </b>
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in 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 15% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	15.00%
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
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Expenses have been restated to reflect current fees.
Expense Example [Heading]	rr_ExpenseExampleHeading	<b>Example.</b>
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	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 and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Any applicable fee waivers and/or expense reimbursements are reflected in the below examples for the first year only. 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	<b>If shares are redeemed</b>
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	<b>If shares are not redeemed</b>
Strategy [Heading]	rr_StrategyHeading	<b>Principal Investment Strategies.</b>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund mainly invests in the common stock of growth companies that are domiciled or have their primary operations outside of the United States and are currently paying dividends or are expected to begin paying dividends in the future. It may invest 100% of its assets in securities of foreign companies. The Fund may invest in emerging markets as well as in developed markets throughout the world. From time to time it may place greater emphasis on investing in one or more particular regions such as Asia, Europe or Latin America. Under normal market conditions the Fund will: invest at least 65% of its total assets in common and preferred stocks of issuers in at least three different countries outside of the United States, and emphasize investments in common stocks of issuers with the potential for growth and steady income. The Fund does not limit its investments to issuers within a specific market capitalization range and at times may invest a substantial portion of its assets in one or more particular capitalization ranges. The Fund can also buy securities convertible into common stock and other securities having equity features.           In selecting investments for the Fund’s portfolio, the portfolio manager evaluates investment opportunities on a company-by-company basis. The portfolio manager looks primarily for foreign companies with high growth potential using a “bottom up” investment approach, that is, by looking at the investment performance of individual stocks before considering the impact of general or industry-specific economic trends. This approach includes fundamental analysis of a company’s financial statements and management structure and consideration of the company’s operations, product development, and industry position. The portfolio manager currently focuses on the following factors, which may vary in particular cases and may change over time: companies that enjoy a strong competitive position and high demand for their products or services; companies with accelerating earnings growth and cash flow; and diversity among companies, industries and countries to help reduce the risks of foreign investing, such as currency fluctuations and stock market volatility. Thereafter, the portfolio manager focuses on the long-term balance between dividend yield, dividend growth and the safety of the dividend payments. The portfolio manager also considers the effect of worldwide trends on the growth of particular business sectors and looks for companies that may benefit from those trends. The trends currently considered include: mass affluence, new technologies, restructuring and aging. The portfolio manager does not invest any fixed amount of the Fund’s assets according to these criteria and the trends that are considered may change over time. The portfolio manager monitors individual issuers for changes in the factors above, which may trigger a decision to sell a security, but does not require a decision to do so.
Risk [Heading]	rr_RiskHeading	<b>Principal Risks.</b>
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	The price of the Fund’s shares can go up and down substantially. The value of the Fund’s investments may fall due to adverse 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 less than what you paid for them. These risks mean that you can lose money by investing in the Fund. Risks of Investing in Stocks. 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. Adverse events in any part of the equity or fixed-income markets may have unexpected negative effects on other market segments. 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. A variety of factors can negatively 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. To the extent that securities of a particular type are emphasized (for example foreign stocks, stocks of small- or mid-cap companies, growth or value stocks, or stocks of companies in a particular industry), fund share values may fluctuate more in response to events affecting the market for those types of securities. Industry and Sector Focus. At times the Fund may increase the relative emphasis of its investments in a particular industry or sector. The prices of stocks of issuers in a particular industry or sector may go up and down in response to changes in economic conditions, government regulations, availability of basic resources or supplies, or other events that affect that industry or sector more than others. To the extent that the Fund increases the relative emphasis of its investments in a particular industry or sector, its share values may fluctuate in response to events affecting that industry or sector. To some extent that risk may be limited by the Fund’s policy of not concentrating its investments in any one industry. Dividend Risk. There is no guarantee that the issuers of the stocks held by the Fund will declare dividends in the future or that, if dividends are declared, they will remain at their current levels or increase over time. Depending on market conditions, dividend paying stocks that also meet the Fund’s investment criteria may not be widely available for purchase by the Fund. This may increase the volatility of the Fund’s returns and may limit the ability of the Fund to produce current income while remaining fully diversified. High-dividend stocks may not experience high earnings growth or capital appreciation. The Fund’s performance during a broad market advance could suffer because dividend paying stocks may not experience the same capital appreciation as non-dividend paying stocks. Risks of Foreign Investing. Foreign securities are subject to special risks. Securities traded in foreign markets may be less liquid and more volatile than those traded in U.S. markets. 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 investments denominated in that foreign currency and in the value of any income or distributions the Fund may receive on those investments. 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. In addition, due to the inter-relationship of global economies and financial markets, changes in political and economic factors in one country or region could adversely affect conditions in another country or region. Investments in foreign securities may also expose the Fund to time-zone arbitrage risk. Foreign securities may trade on weekends or other days when the Fund does not price its shares. As a result, the value of the Fund’s net assets may change on days when you will not be able to purchase or redeem the Fund’s shares. At times, the Fund may emphasize investments in a particular country or region and may be subject to greater risks from adverse events that occur in that country or region. Foreign securities and foreign currencies held in foreign banks and securities depositories may be subject to only limited or no regulatory oversight.           Eurozone Investment Risks. Certain of the regions in which the Fund may invest, including the European Union (EU), currently experience significant financial difficulties. Following the global economic crisis that began in 2008, some of these countries have depended on, and may continue to be dependent on, the assistance from others such as the European Central Bank (ECB) or other governments or institutions, and failure to implement reforms as a condition of assistance could have a significant adverse effect on the value of investments in those and other European countries. In addition, countries that have adopted the euro are subject to fiscal and monetary controls that could limit the ability to implement their own economic policies, and could voluntarily abandon, or be forced out of, the euro. Such events could impact the market values of Eurozone and various other securities and currencies, cause redenomination of certain securities into less valuable local currencies, and create more volatile and illiquid markets. Additionally, the United Kingdom’s intended departure from the EU, commonly known as “Brexit,” may have significant political and financial consequences for Eurozone markets, including greater market volatility and illiquidity, currency fluctuations, deterioration in economic activity, a decrease in business confidence and an increased likelihood of a recession in the United Kingdom.           Risks of Developing and Emerging Markets. Investments in developing and emerging markets are subject to all the risks associated with foreign investing, however, these risks may be magnified in developing and emerging markets. Developing or emerging market countries may have less well-developed securities markets and exchanges that may be substantially less liquid than those of more developed markets. Settlement procedures in developing or emerging markets may differ from those of more established securities markets, and settlement delays may result in the inability to invest assets or to dispose of portfolio securities in a timely manner. Securities prices in developing or emerging markets may be significantly more volatile than is the case in more developed nations of the world, and governments of developing or emerging market countries may also be more unstable than the governments of more developed countries. Such countries’ economies may be more dependent on relatively few industries or investors that may be highly vulnerable to local and global changes. Developing or emerging market countries also may be subject to social, political or economic instability. The value of developing or emerging market countries’ 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, restrictions on withdrawing assets from the country, protectionist measures, and practices such as share blocking. In addition, the ability of foreign entities to participate in privatization programs of certain developing or emerging market countries may be limited by local law. Investments in securities of issuers in developing or emerging market countries may be considered speculative. Risks of Small- and Mid-Cap Companies. Small-cap companies may be either established or newer companies, including “unseasoned” companies that have typically been in operation for less than three years. Mid-cap companies are generally companies that have completed their initial start-up cycle, and in many cases have established markets and developed seasoned market teams. While smaller companies might offer greater opportunities for gain than larger companies, they also may involve greater risk of loss. They may be more sensitive to changes in a company’s earnings expectations and may experience more abrupt and erratic price movements. Small- and mid-cap companies’ securities may trade in lower volumes and it might be harder for the Fund to dispose of its holdings at an acceptable price when it wants to sell them. Small- and mid-cap companies may not have established markets for their products or services and may have fewer customers and product lines. They may have more limited access to financial resources and may not have the financial strength to sustain them through business downturns or adverse market conditions. Since small- and mid-cap companies typically reinvest a high proportion of their earnings in their business, they may not pay dividends for some time, particularly if they are newer companies. Small- and mid-cap companies may have unseasoned management or less depth in management skill than larger, more established companies. They may be more reliant on the efforts of particular members of their management team and management changes may pose a greater risk to the success of the business. It may take a substantial period of time before the Fund realizes a gain on an investment in a small- or mid-cap company, if it realizes any gain at all. Risks of Growth Investing. If a growth company’s earnings or stock price fails to increase as anticipated, or if its business plans do not produce the expected results, its securities may decline sharply. Growth companies may be newer or smaller companies that may experience greater stock price fluctuations and risks of loss than larger, more established companies. Newer growth companies tend to retain a large part of their earnings for research, development or investments in capital assets. Therefore, they may not pay any dividends for some time. Growth investing has gone in and out of favor during past market cycles and is likely to continue to do so. During periods when growth investing is out of favor or when markets are unstable, it may be more difficult to sell growth company securities at an acceptable price. Growth stocks may also be more volatile than other securities because of investor speculation. Who Is The Fund Designed For? The Fund is designed primarily for investors seeking total return with an emphasis on growth while providing current income. Those investors should be willing to assume the greater risks of share price fluctuations that are typical for an aggressive fund focusing on growth stock investments while identifying issuers with higher income potential, and the special risks of investing in both developed and emerging foreign countries. 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]	rr_RiskLoseMoney	<i>These risks mean that you can lose money by investing in the Fund.</i>
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	<b>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.</b>
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<b>The Fund’s Past Performance.</b>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	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. Sales charges and taxes are not reflected in the bar chart and if those charges were included, returns would be less than those shown. 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/InternationalGrowthAndIncomeFund
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	<i>https://www.oppenheimerfunds.com/fund/InternationalGrowthAndIncomeFund</i>
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 Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	Sales charges and taxes are not reflected in the bar chart and if those charges were included, returns would be less than those shown.
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 7.84% (1st Qtr 17) and the lowest return for a calendar quarter was 0.93% (4th Qtr 17). For the period from January 1, 2018 to June 30, 2018 the return before sales charges and taxes was -8.16%.
Performance Table Heading	rr_PerformanceTableHeading	<b>Average Annual Total Returns</b> for the periods ended December 31, 2017
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.
Oppenheimer International Growth & Income 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	0.85%	[1]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%	[1]
Other Expenses	rr_OtherExpensesOverAssets	1.35%	[1]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.45%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(1.20%)	[1],[2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	1.25%	[1]
1 Year	rr_ExpenseExampleYear01	$ 696
3 Years	rr_ExpenseExampleYear03	1,193
5 Years	rr_ExpenseExampleYear05	1,716
10 Years	rr_ExpenseExampleYear10	3,145
1 Year	rr_ExpenseExampleNoRedemptionYear01	696
3 Years	rr_ExpenseExampleNoRedemptionYear03	1,193
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,716
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 3,145
2017	rr_AnnualReturn2017	16.98%
Year to Date Return, Label	rr_YearToDateReturnLabel	For the period from January 1, 2018 to June 30, 2018
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2018
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(8.16%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2017
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	7.84%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2017
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	0.93%
1 Year	rr_AverageAnnualReturnYear01	10.25%
5 Years (or life of class, if less)	rr_AverageAnnualReturnSinceInception	9.43%
Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 28, 2016
Oppenheimer International Growth & Income 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	0.85%	[1]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%	[1]
Other Expenses	rr_OtherExpensesOverAssets	1.70%	[1]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	3.55%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(1.55%)	[1],[2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	2.00%	[1]
1 Year	rr_ExpenseExampleYear01	$ 305
3 Years	rr_ExpenseExampleYear03	960
5 Years	rr_ExpenseExampleYear05	1,737
10 Years	rr_ExpenseExampleYear10	3,781
1 Year	rr_ExpenseExampleNoRedemptionYear01	205
3 Years	rr_ExpenseExampleNoRedemptionYear03	960
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,737
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 3,781
1 Year	rr_AverageAnnualReturnYear01	15.04%
5 Years (or life of class, if less)	rr_AverageAnnualReturnSinceInception	14.20%
Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 28, 2016
Oppenheimer International Growth & Income Fund | Class R
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	0.85%	[1]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.50%	[1]
Other Expenses	rr_OtherExpensesOverAssets	2.18%	[1]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	3.53%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(2.03%)	[1],[2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	1.50%	[1]
1 Year	rr_ExpenseExampleYear01	$ 154
3 Years	rr_ExpenseExampleYear03	908
5 Years	rr_ExpenseExampleYear05	1,685
10 Years	rr_ExpenseExampleYear10	3,729
1 Year	rr_ExpenseExampleNoRedemptionYear01	154
3 Years	rr_ExpenseExampleNoRedemptionYear03	908
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,685
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 3,729
1 Year	rr_AverageAnnualReturnYear01	16.57%
5 Years (or life of class, if less)	rr_AverageAnnualReturnSinceInception	14.70%
Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 28, 2016
Oppenheimer International Growth & Income 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	0.85%	[1]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none	[1]
Other Expenses	rr_OtherExpensesOverAssets	1.27%	[1]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.12%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(1.12%)	[1],[2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	1.00%	[1]
1 Year	rr_ExpenseExampleYear01	$ 103
3 Years	rr_ExpenseExampleYear03	561
5 Years	rr_ExpenseExampleYear05	1,046
10 Years	rr_ExpenseExampleYear10	2,387
1 Year	rr_ExpenseExampleNoRedemptionYear01	103
3 Years	rr_ExpenseExampleNoRedemptionYear03	561
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,046
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,387
1 Year	rr_AverageAnnualReturnYear01	17.22%
5 Years (or life of class, if less)	rr_AverageAnnualReturnSinceInception	15.33%
Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 28, 2016
Oppenheimer International Growth & Income 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	0.85%	[1]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none	[1]
Other Expenses	rr_OtherExpensesOverAssets	1.23%	[1]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.08%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(1.18%)	[1],[2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	0.90%	[1]
1 Year	rr_ExpenseExampleYear01	$ 92
3 Years	rr_ExpenseExampleYear03	543
5 Years	rr_ExpenseExampleYear05	1,020
10 Years	rr_ExpenseExampleYear10	2,340
1 Year	rr_ExpenseExampleNoRedemptionYear01	92
3 Years	rr_ExpenseExampleNoRedemptionYear03	543
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,020
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,340
1 Year	rr_AverageAnnualReturnYear01	17.41%
5 Years (or life of class, if less)	rr_AverageAnnualReturnSinceInception	15.50%
Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 28, 2016
Oppenheimer International Growth & Income Fund | Return After Taxes on Distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	9.18%
5 Years (or life of class, if less)	rr_AverageAnnualReturnSinceInception	8.48%
Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 28, 2016
Oppenheimer International Growth & Income Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.85%
5 Years (or life of class, if less)	rr_AverageAnnualReturnSinceInception	6.80%
Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 28, 2016
Oppenheimer International Growth & Income Fund | MSCI EAFE Index (reflects no deduction for fees, expenses, or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	25.03%
5 Years (or life of class, if less)	rr_AverageAnnualReturnSinceInception	22.36%	[3]

[1] Expenses have been restated to reflect current fees.

[2] After discussions with the Fund’s Board, the Manager has contractually agreed to waive fees and/or reimburse the Fund for certain expenses in order to limit “Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement” (excluding any applicable dividend expense, taxes, interest and fees from borrowing, any subsidiary expenses, Acquired Fund Fees and Expenses, brokerage commissions, unusual and infrequent expenses and certain other Fund expenses) to annual rates of 1.25% for Class A shares, 2.00% for Class C shares, 1.50% for Class R shares, 1.00% for Class Y shares and 0.90% for Class I shares, as calculated on the daily net assets of the Fund. These fee waivers and/or expense reimbursements may not be amended or withdrawn for one year from the date of this prospectus, unless approved by the Board.

[3] From 10/28/16

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Oppenheimer International Growth & Income Fund
Prospectus Date	rr_ProspectusDate	Sep. 27, 2018
Document Creation Date	dei_DocumentCreationDate	Sep. 26, 2018