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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2011
Registrant Name dei_EntityRegistrantName T. Rowe Price Institutional International Funds, Inc.
Central Index Key dei_EntityCentralIndexKey 0000852254
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Apr. 26, 2012
Document Effective Date dei_DocumentEffectiveDate May 01, 2012
Prospectus Date rr_ProspectusDate May 01, 2012
T. Rowe Price Institutional Emerging Markets Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

SUMMARY

T. Rowe Price Institutional Emerging Markets Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide high income and capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.
Shareholder Fees: rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Annual fund operating expenses

(expenses that you pay each year as a

percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 49.9% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 49.90%
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading

Investments, Risks, and Performance

Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The fund will normally invest at least 80% (and potentially all) of its net assets (including any borrowings for investment purposes) in debt securities of emerging market governments or companies located in emerging market countries. Fund holdings may be denominated in U.S. dollars or non-U.S. dollar currencies, including emerging market currencies. The extent, if any, to which the fund attempts to cushion the impact of foreign currency fluctuations on the dollar depends on market conditions. Fund holdings may include the lowest-rated bonds, including those in default, and there are no overall limits on the fund’s investments that are rated below investment-grade (“junk” bonds).

Although we expect to maintain an intermediate- to long-term weighted average maturity for the fund, there are no maturity restrictions on the overall portfolio or on individual securities. Security selection relies heavily on research, which analyzes political and economic trends as well as creditworthiness. The fund allocates investments among a variety of emerging markets (1) in order to establish a diverse portfolio; (2) based on the relative value of opportunities and associated risks within one country versus others; and (3) with a view to the liquidity of each particular market. The fund tends to favor bonds it expects will be upgraded. The fund sells holdings for a variety of reasons, such as to adjust its average maturity or credit quality, to shift assets into and out of higher-yielding securities, or to alter geographic or currency exposure.

The fund is “nondiversified,” meaning it may invest a greater portion of its assets in fewer issuers than is permissible for a “diversified” fund.

While most assets will be invested in bonds, the fund may enter into forward currency exchange contracts in keeping with the fund’s objectives. Forward currency exchange contracts would primarily be used to help protect the fund’s holdings from unfavorable changes in foreign currency exchange rates, although other currency hedging techniques may be used from time to time.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

As with any mutual fund, there is no guarantee that the fund will achieve its objective. The fund’s share price fluctuates, which means you could lose money by investing in the fund. The principal risks of investing in this fund are summarized as follows:

Active management risk The fund is subject to the risk that the investment adviser’s judgments about the attractiveness, value, or potential appreciation of the fund’s investments may prove to be incorrect. If the securities selected and strategies employed by the fund fail to produce the intended results, the fund could underperform other funds with similar objectives and investment strategies.

Foreign investing risk Investing in the securities of non-U.S. issuers involves special risks not typically associated with investing in U.S. securities. Foreign securities tend to be more volatile and less liquid than investments in U.S. securities and may lose value because of adverse political, social, or economic developments overseas. In addition, foreign investments may be subject to regulatory and accounting standards that differ from those of the U.S.

Emerging markets risk The risks of foreign investing are heightened for securities of issuers in emerging market countries. Emerging market countries tend to have economic structures that are less diverse and mature, and political systems that are less stable, than those of developed countries. In addition to all of the risks of investing in foreign developed markets, emerging markets are more susceptible to governmental interference, local taxes being imposed on foreign investments, restrictions on gaining access to sales proceeds, and less liquid and efficient trading markets.

Currency risk Because the fund may invest in securities issued in foreign currencies, the fund is subject to the risk that it could experience losses based solely on the weakness of foreign currencies versus the U.S. dollar and changes in the exchange rates between such currencies and the U.S. dollar. Any attempts at currency hedging may not be successful and could cause the fund to lose money.

Credit risk This is the risk that an issuer of a debt security or a counterparty to an over-the-counter derivative could suffer an adverse change in financial condition that results in a payment default, security downgrade, or inability to meet a financial obligation. The risk of default is much greater for emerging market bonds and securities rated as below investment-grade (“junk” bonds). The fund is exposed to greater credit risk than other bond funds because companies in emerging markets are usually not as strong financially and are more susceptible to economic downturns. Junk bonds should be considered speculative as they carry greater risks of default and erratic price swings due to real or perceived changes in the credit quality of the issuer.

Interest rate risk This risk refers to the chance that interest rates will increase, causing a decline in bond prices. (Bond prices and interest rates usually move in opposite directions.) Generally, securities with longer maturities and funds with longer weighted average maturities carry greater interest rate risk.

Liquidity risk This is the risk that the fund may not be able to sell a holding in a timely manner at a desired price.

Nondiversification risk As a nondiversified fund, the fund has the ability to invest a larger percentage of its assets in the securities of a smaller number of issuers than a diversified fund. As a result, poor performance by a single issuer could adversely affect fund performance more than if the fund were invested in a larger number of issuers. The fund’s share price can be expected to fluctuate more than that of a comparable diversified fund.

Derivatives risk To the extent the fund uses forward currency exchange contracts, it is exposed to greater volatility and losses in comparison to investing directly in foreign bonds. Forward currency exchange contracts are also subject to the risks that anticipated currency movements will not be accurately predicted, a counterparty will fail to perform in accordance with the terms of the agreement, and the chance that potential government regulation could negatively affect the fund’s investments in such instruments.
Risk Lose Money [Text] rr_RiskLoseMoney The fund’s share price fluctuates, which means you could lose money by investing in the fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Nondiversification risk As a nondiversified fund, the fund has the ability to invest a larger percentage of its assets in the securities of a smaller number of issuers than a diversified fund. As a result, poor performance by a single issuer could adversely affect fund performance more than if the fund were invested in a larger number of issuers. The fund’s share price can be expected to fluctuate more than that of a comparable diversified fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index. The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.

The fund can also experience short-term performance swings, as shown by the best and worst calendar quarter returns during the years depicted.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-638-8790
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress troweprice.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading

Institutional Emerging Markets Bond Fund

Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
           
    Quarter   Total  
    Ended   Return  
Best Quarter   6/30/09   13.37%  
Worst Quarter   12/31/08   -11.29%  
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns

Periods ended

December 31, 2011
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock In addition, the average annual total returns table shows hypothetical after-tax returns to suggest how taxes paid by a shareholder may influence returns. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com or may be obtained by calling 1-800-638-8790.
T. Rowe Price Institutional Emerging Markets Bond Fund | T. Rowe Price Institutional Emerging Markets Bond Fund
  
Shareholder Fees: rr_ShareholderFeesAbstract  
Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less) rr_RedemptionFeeOverRedemption 2.00%
Operating Expenses: rr_OperatingExpensesAbstract  
Management fees rr_ManagementFeesOverAssets 0.70%
Other expenses rr_OtherExpensesOverAssets none
Total annual fund operating expenses rr_ExpensesOverAssets 0.70%
Expense Example: rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 72
3 years rr_ExpenseExampleYear03 224
5 years rr_ExpenseExampleYear05 390
10 years rr_ExpenseExampleYear10 871
Bar Chart Table: rr_BarChartTableAbstract  
07 rr_AnnualReturn2007 5.15%
08 rr_AnnualReturn2008 (17.48%)
09 rr_AnnualReturn2009 35.63%
10 rr_AnnualReturn2010 14.23%
11 rr_AnnualReturn2011 2.84%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.37%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.29%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.84%
5 Years rr_AverageAnnualReturnYear05 6.69%
Since Inception rr_AverageAnnualReturnSinceInception 6.88%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2006
T. Rowe Price Institutional Emerging Markets Bond Fund | Returns after taxes on distributions | T. Rowe Price Institutional Emerging Markets Bond Fund
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.06%)
5 Years rr_AverageAnnualReturnYear05 3.80%
Since Inception rr_AverageAnnualReturnSinceInception 4.03%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2006
T. Rowe Price Institutional Emerging Markets Bond Fund | Returns after taxes on distributions and sale of fund shares | T. Rowe Price Institutional Emerging Markets Bond Fund
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.36%
5 Years rr_AverageAnnualReturnYear05 4.07%
Since Inception rr_AverageAnnualReturnSinceInception 4.28%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2006
T. Rowe Price Institutional Emerging Markets Bond Fund | J.P. Morgan Emerging Markets Bond Index Global Diversified
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.35%
5 Years rr_AverageAnnualReturnYear05 7.87%
Since Inception rr_AverageAnnualReturnSinceInception 7.87%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2006
T. Rowe Price Institutional International Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

SUMMARY

T. Rowe Price Institutional International Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide current income and capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.
Shareholder Fees: rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)
Operating Expenses: rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Annual fund operating expenses

(expenses that you pay each year as a

percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 49.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 49.50%
Expense Example: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading

Investments, Risks, and Performance

Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Normally, the fund will invest at least 80% of its net assets (including any borrowings for investment purposes) in foreign bonds and 50% of its net assets in foreign bonds that are rated within the three highest credit categories (i.e., A- or equivalent, or better), as determined by at least one nationally recognized credit rating agency or, if unrated, deemed to be of comparable quality by T. Rowe Price. If a bond is split-rated (i.e., assigned different ratings by different credit rating agencies), the higher rating will be used. The fund may invest up to 25% of its total assets in “junk” bonds that have received a below investment-grade rating (i.e., BB or equivalent, or lower) from each of the rating agencies that has assigned a rating to the bond (or, if unrated, deemed to be below investment-grade quality by T. Rowe Price), including those in default or with the lowest rating. There is no limit on the fund’s investments in investment-grade bonds of emerging markets. The fund may use credit default swaps to buy or sell credit protection on individual bond issuers or sectors of the bond markets. If the fund buys protection, it effectively takes a short position, and if the fund sells protection, it effectively takes a long position, with respect to the credit of the company or sector.

Although we expect to maintain an intermediate- to long-term weighted average maturity (between 5 to 15 years) for the fund, there are no maturity restrictions on the overall portfolio or on individual securities. Through the use of futures contracts and interest rate swaps, the fund may either extend or shorten the overall maturity of the fund and take long or short positions in particular bond markets (including the U.S.). The fund’s overall net short positions in bond markets will not exceed 10% of its net assets. A short position in a bond market means that the fund, for example, could sell interest rate futures with respect to bonds of a particular market and the value of the futures would exceed the value of the bonds held by the fund (or the fund could sell futures with respect to a particular bond market without owning any bonds in that market).

The fund’s currency positions will vary with its outlook on the strength or weakness of the U.S. dollar compared to foreign currencies and the relative value of various foreign currencies to one another. Through the use of forward foreign exchange contracts and other currency derivatives, such as swaps, options and futures, the fund has wide flexibility to purchase and sell currencies independently of whether the fund owns bonds in those currencies and to engage in currency hedging transactions. Currency hedging into the U.S. dollar is permitted, but not required, and the fund is likely to be heavily exposed to foreign currencies. The fund’s overall short positions in currencies (including the U.S. dollar) are limited to 10% of its net assets. A short position in a currency means that the fund could sell a currency in excess of its assets denominated in that currency (or the fund might sell a currency even if it doesn’t own any assets denominated in the currency).

The fund is “nondiversified,” meaning it may invest a greater portion of its assets in fewer issuers than is permissible for a “diversified” fund.

Investment decisions are based on fundamental market factors, such as yield and credit quality differences among bonds as well as supply and demand trends and currency values. The fund generally invests in securities where the combination of fixed-income returns and currency exchange rates appears attractive or, if the currency trend is unfavorable, where we believe the currency risk can be minimized through hedging. The fund sells holdings for a variety of reasons, such as to adjust the portfolio’s average maturity or credit quality, to shift assets into and out of higher-yielding securities, or to alter geographic or currency exposure.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

As with any mutual fund, there is no guarantee that the fund will achieve its objective. The fund’s share price fluctuates, which means you could lose money by investing in the fund. The principal risks of investing in this fund are summarized as follows:

Active management risk The fund is subject to the risk that the investment adviser’s judgments about the attractiveness, value, or potential appreciation of the fund’s investments may prove to be incorrect. If the securities selected and strategies employed by the fund fail to produce the intended results, the fund could underperform other funds with similar objectives and investment strategies.

Foreign investing risk Investing in the securities of non-U.S. issuers involves special risks not typically associated with investing in U.S. securities. Foreign securities tend to be more volatile and less liquid than investments in U.S. securities and may lose value because of adverse political, social, or economic developments overseas. In addition, foreign investments may be subject to regulatory and accounting standards that differ from those of the U.S.

Emerging markets risk The risks of foreign investing are heightened for securities of issuers in emerging market countries. Emerging market countries tend to have economic structures that are less diverse and mature, and political systems that are less stable, than those of developed countries. In addition to all of the risks of investing in foreign developed markets, emerging markets are more susceptible to governmental interference, local taxes being imposed on foreign investments, restrictions on gaining access to sales proceeds, and less liquid and efficient trading markets.

Currency risk Because the fund generally invests in securities issued in foreign currencies, the fund is subject to the risk that it could experience losses based solely on the weakness of foreign currencies versus the U.S. dollar and changes in the exchange rates between such currencies and the U.S. dollar.

Hedging risk The fund’s attempts at hedging and taking long and short positions in currencies may not be successful and could cause the fund to lose money or fail to get the benefit of a gain on a hedged position. If expected changes to securities prices, interest rates, currency values and exchange rates, or the creditworthiness of an issuer are not accurately predicted, the fund could be in a worse position than if it had not entered into such transactions.

Credit risk This is the risk that an issuer of a debt security or a counterparty to an over-the-counter derivative could suffer an adverse change in financial condition that results in a payment default, security downgrade, or inability to meet a financial obligation. The fund’s overall credit risk is increased to the extent the fund invests in emerging markets bonds or bonds rated below investment-grade. Such investments carry a higher risk of default and should be considered speculative.

Interest rate risk This risk refers to the chance that interest rates will increase, causing a decline in bond prices. (Bond prices and interest rates usually move in opposite directions.) Generally, securities with longer maturities and funds with longer weighted average maturities carry greater interest rate risk.

Liquidity risk This is the risk that the fund may not be able to sell a holding in a timely manner at a desired price.

Nondiversification risk As a nondiversified fund, the fund has the ability to invest a larger percentage of its assets in the securities of a smaller number of issuers than a diversified fund. As a result, poor performance by a single issuer could adversely affect fund performance more than if the fund were invested in a larger number of issuers. The fund’s share price can be expected to fluctuate more than that of a comparable diversified fund.

Derivatives risk To the extent the fund uses forward currency exchange contracts, swaps, options, or futures, it is exposed to additional volatility in comparison to investing directly in bonds and other debt securities. These instruments can be illiquid and difficult to value, may involve leverage so that small changes produce disproportionate losses for the fund, and instruments not traded on an exchange are subject to the risk that a counterparty to the transaction will fail to meet its obligations under the derivatives contract. The fund’s principal use of derivatives involves the risk that anticipated changes in currency values, currency exchange rates, interest rates, or the creditworthiness of an issuer will not be accurately predicted, which could significantly harm the fund’s performance, and the chance that regulatory developments could negatively affect the fund’s investments in such instruments.
Risk Lose Money [Text] rr_RiskLoseMoney The fund’s share price fluctuates, which means you could lose money by investing in the fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Nondiversification risk As a nondiversified fund, the fund has the ability to invest a larger percentage of its assets in the securities of a smaller number of issuers than a diversified fund. As a result, poor performance by a single issuer could adversely affect fund performance more than if the fund were invested in a larger number of issuers. The fund’s share price can be expected to fluctuate more than that of a comparable diversified fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index. The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.

The fund can also experience short-term performance swings, as shown by the best and worst calendar quarter returns during the years depicted.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-638-8790
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress troweprice.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.
Bar Chart Table: rr_BarChartTableAbstract  
Bar Chart [Heading] rr_BarChartHeading Institutional International Bond Fund
Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
           
    Quarter   Total  
    Ended   Return  
Best Quarter   9/30/10   11.05%  
Worst Quarter   9/30/08   -6.33%  
Average Annual Return: rr_AverageAnnualReturnAbstract  
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns

Periods ended

December 31, 2011
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock In addition, the average annual total returns table shows hypothetical after-tax returns to suggest how taxes paid by a shareholder may influence returns. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com or may be obtained by calling 1-800-638-8790.
T. Rowe Price Institutional International Bond Fund | T. Rowe Price Institutional International Bond Fund
  
Shareholder Fees: rr_ShareholderFeesAbstract  
Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less) rr_RedemptionFeeOverRedemption 2.00%
Operating Expenses: rr_OperatingExpensesAbstract  
Management fees rr_ManagementFeesOverAssets 0.55%
Other expenses rr_OtherExpensesOverAssets none
Total annual fund operating expenses rr_ExpensesOverAssets 0.55%
Expense Example: rr_ExpenseExampleAbstract  
1 year rr_ExpenseExampleYear01 56
3 years rr_ExpenseExampleYear03 176
5 years rr_ExpenseExampleYear05 307
10 years rr_ExpenseExampleYear10 689
Bar Chart Table: rr_BarChartTableAbstract  
08 rr_AnnualReturn2008 1.26%
09 rr_AnnualReturn2009 8.77%
10 rr_AnnualReturn2010 5.19%
11 rr_AnnualReturn2011 1.95%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2010
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.05%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.33%)
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.95%
Since Inception rr_AverageAnnualReturnSinceInception 5.73%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2007
T. Rowe Price Institutional International Bond Fund | Returns after taxes on distributions | T. Rowe Price Institutional International Bond Fund
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.92%)
Since Inception rr_AverageAnnualReturnSinceInception 3.29%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2007
T. Rowe Price Institutional International Bond Fund | Returns after taxes on distributions and sale of fund shares | T. Rowe Price Institutional International Bond Fund
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.27%
Since Inception rr_AverageAnnualReturnSinceInception 3.48%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2007
T. Rowe Price Institutional International Bond Fund | Barclays Global Aggregate ex USD Bond Index
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.36%
Since Inception rr_AverageAnnualReturnSinceInception 6.89%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2007
T. Rowe Price Institutional International Bond Fund | Lipper International Income Funds Average
  
Average Annual Return: rr_AverageAnnualReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.97%
Since Inception rr_AverageAnnualReturnSinceInception 6.54%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2007