485BPOS

Registration Nos. 033-29697/811-5833

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 /X/

Post-Effective Amendment No. 51 /X/

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 /X/

Amendment No. 49 /X/

T. ROWE PRICE INSTITUTIONAL INTERNATIONAL FUNDS, INC.

Exact Name of Registrant as Specified in Charter

100 East Pratt Street, Baltimore, Maryland 21202
Address of Principal Executive Offices

410-345-2000
Registrant’s Telephone Number, Including Area Code

David Oestreicher

100 East Pratt Street, Baltimore, Maryland 21202
Name and Address of Agent for Service

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

/X/Immediately upon filing pursuant to paragraph (b)

//On (date) pursuant to paragraph (b)

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

//On (date) pursuant to paragraph (a)(1)

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

//On (date) 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.

Page 2

EXHIBITS

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

Page 3

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of 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, duly authorized, in the City of Baltimore, State of Maryland, this March 13, 2012.

T. ROWE PRICE INSTITUTIONAL INTERNATIONAL FUNDS, INC.

/s/Edward C. Bernard

By:Edward C. Bernard

Chairman of the Board

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

Signature	Title	Date
/s/Edward C. Bernard	Chairman of the Board	March 13, 2012
Edward C. Bernard	(Chief Executive Officer)
/s/Gregory K. Hinkle	Treasurer (Chief	March 13, 2012
Gregory K. Hinkle	Financial Officer)
*	Director	March 13, 2012
William R. Brody
*	Director	March 13, 2012
Jeremiah E. Casey
*	Director	March 13, 2012
Anthony W. Deering
*	Director	March 13, 2012
Donald W. Dick, Jr.
*	Director	March 13, 2012
Karen N. Horn
*	Director	March 13, 2012
Theo C. Rodgers
/s/Brian C. Rogers	Director	March 13, 2012
Brian C. Rogers

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*	Director	March 13, 2012
John G. Schreiber
*	Director	March 13, 2012
Mark. R. Tercek
*/s/David Oestreicher	Vice President and	March 13, 2012
David Oestreicher	Attorney-In-Fact

Page 5

T. ROWE PRICE BALANCED FUND, INC.

T. ROWE PRICE BLUE CHIP GROWTH FUND, INC.

T. ROWE PRICE CALIFORNIA TAX-FREE INCOME TRUST

T. ROWE PRICE CAPITAL APPRECIATION FUND

T. ROWE PRICE CAPITAL OPPORTUNITY FUND, INC.

T. ROWE PRICE CORPORATE INCOME FUND, INC.

T. ROWE PRICE DIVERSIFIED MID-CAP GROWTH FUND, INC.

T. ROWE PRICE DIVERSIFIED SMALL-CAP GROWTH FUND, INC.

T. ROWE PRICE DIVIDEND GROWTH FUND, INC.

T. ROWE PRICE EQUITY INCOME FUND

T. ROWE PRICE EQUITY SERIES, INC.

T. ROWE PRICE FINANCIAL SERVICES FUND, INC.

T. ROWE PRICE FIXED INCOME SERIES, INC.

T. ROWE PRICE FLOATING RATE FUND, INC.

T. ROWE PRICE GLOBAL REAL ESTATE FUND, INC.

T. ROWE PRICE GLOBAL TECHNOLOGY FUND, INC.

T. ROWE PRICE GNMA FUND

T. ROWE PRICE GROWTH & INCOME FUND, INC.

T. ROWE PRICE GROWTH STOCK FUND, INC.

T. ROWE PRICE HEALTH SCIENCES FUND, INC.

T. ROWE PRICE HIGH YIELD FUND, INC.

T. ROWE PRICE INDEX TRUST, INC.

T. ROWE PRICE INFLATION FOCUSED BOND FUND, INC.

T. ROWE PRICE INFLATION PROTECTED BOND FUND, INC.

T. ROWE PRICE INSTITUTIONAL EQUITY FUNDS, INC.

T. ROWE PRICE INSTITUTIONAL INCOME FUNDS, INC.

T. ROWE PRICE INSTITUTIONAL INTERNATIONAL FUNDS, INC.

T. ROWE PRICE INTERNATIONAL FUNDS, INC.

T. ROWE PRICE INTERNATIONAL INDEX FUND, INC.

T. ROWE PRICE INTERNATIONAL SERIES, INC.

T. ROWE PRICE MEDIA & TELECOMMUNICATIONS FUND, INC.

T. ROWE PRICE MID-CAP GROWTH FUND, INC.

T. ROWE PRICE MID-CAP VALUE FUND, INC.

T. ROWE PRICE NEW AMERICA GROWTH FUND
T. ROWE PRICE NEW ERA FUND, INC.

T. ROWE PRICE NEW HORIZONS FUND, INC.

T. ROWE PRICE NEW INCOME FUND, INC.

T. ROWE PRICE PERSONAL STRATEGY FUNDS, INC.

T. ROWE PRICE PRIME RESERVE FUND, INC.

T. ROWE PRICE REAL ASSETS FUND, INC.

T. ROWE PRICE REAL ESTATE FUND, INC.

T. ROWE PRICE RESERVE INVESTMENT FUNDS, INC.

T. ROWE PRICE RETIREMENT FUNDS, INC.

T. ROWE PRICE SCIENCE & TECHNOLOGY FUND, INC.

T. ROWE PRICE SHORT-TERM BOND FUND, INC.

T. ROWE PRICE SMALL-CAP STOCK FUND, INC.

T. ROWE PRICE SMALL-CAP VALUE FUND, INC.

T. ROWE PRICE SPECTRUM FUND, INC.

T. ROWE PRICE STATE TAX-FREE INCOME TRUST

T. ROWE PRICE STRATEGIC INCOME FUND, INC.

Page 6

T. ROWE PRICE SUMMIT FUNDS, INC.

T. ROWE PRICE SUMMIT MUNICIPAL FUNDS, INC.

T. ROWE PRICE TAX-EFFICIENT FUNDS, INC.

T. ROWE PRICE TAX-EXEMPT MONEY FUND, INC.

T. ROWE PRICE TAX-FREE HIGH YIELD FUND, INC.

T. ROWE PRICE TAX-FREE INCOME FUND, INC.

T. ROWE PRICE TAX-FREE SHORT-INTERMEDIATE FUND, INC.

T. ROWE PRICE U.S. BOND INDEX FUND, INC.

T. ROWE PRICE U.S. LARGE-CAP CORE FUND, INC.

T. ROWE PRICE U.S. TREASURY FUNDS, INC.

T. ROWE PRICE VALUE FUND, INC.

POWER OF ATTORNEY

RESOLVED, that the Corporation does hereby constitute and authorize Edward C. Bernard, Margery K. Neale and David Oestreicher, and each of them individually, their true and lawful attorneys and agents to take any and all action and execute any and all instruments which said attorneys and agents may deem necessary or advisable to enable the Corporation/Trust to comply with the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, and any rules, regulations, orders or other requirements of the United States Securities and Exchange Commission thereunder, in connection with the registration under the Securities Act of 1933, as amended, of shares of the Corporation/Trust, to be offered by the Corporation/Trust, and the registration of the Corporation/Trust under the Investment Company Act of 1940, as amended, including specifically, but without limitation of the foregoing, power and authority to sign the name of the Corporation/Trust on its behalf, and to sign the names of each of such directors/trustees and officers on his behalf as such director/trustee or officer to any (i) Registration Statement on Form N-1A or N-14 of the Corporation/Trust filed with the Securities and Exchange Commission under the Securities Act of 1933, as amended; (ii) Registration Statement on Form N-1A or N-14 of the Corporation/Trust under the Investment Company Act of 1940, as amended; (iii) amendment or supplement (including, but not limited to, Post-Effective Amendments adding additional series or classes of the Corporation/ Trust) to said Registration Statement; and (iv) instruments or documents filed or to be filed as a part of or in connection with such Registration Statement, including Articles Supplementary, Articles of Amendment, and other instruments with respect to the Articles of Incorporation or Master Trust Agreement of the Corporation/Trust.

IN WITNESS WHEREOF, the above named Corporations/Trusts have caused these presents to be signed and the same attested by its Secretary, each thereunto duly authorized by its Board of Directors/Trustees, and each of the undersigned has hereunto set his hand and seal as of the day set opposite his name.

Page 7

ALL CORPORATIONS/TRUSTS
/s/Edward C. Bernard Edward C. Bernard	Chairman of the Board (Principal Executive Officer) Director/Trustee	April 20, 2011
/s/Gregory K. Hinkle Gregory K. Hinkle	Treasurer (Principal Financial Officer)	April 20, 2011
/s/William R. Brody William R. Brody	Director/Trustee	April 20, 2011
/s/Jeremiah E. Casey Jeremiah E. Casey	Director/Trustee	April 20, 2011
/s/Anthony W. Deering Anthony W. Deering	Director/Trustee	April 20, 2011
/s/Donald W. Dick, Jr. Donald W. Dick, Jr.	Director/Trustee	April 20, 2011
/s/Karen N. Horn Karen N. Horn	Director/Trustee	April 20, 2011
/s/Theo C. Rodgers Theo C. Rodgers	Director/Trustee	April 20, 2011
/s/John G. Schreiber John G. Schreiber	Director/Trustee	April 20, 2011
/s/Mark R. Tercek Mark R. Tercek	Director/Trustee	April 20, 2011

(Signatures Continued)

Page 8

MICHAEL C. GITLIN, Director/Trustee

T. ROWE PRICE CALIFORNIA TAX-FREE INCOME TRUST

T. ROWE PRICE CORPORATE INCOME FUND, INC.

T. ROWE PRICE FIXED INCOME SERIES, INC.

T. ROWE PRICE GNMA FUND

T. ROWE PRICE HIGH YIELD FUND, INC.

T. ROWE PRICE INSTITUTIONAL INCOME FUNDS, INC.

T. ROWE PRICE INFLATION FOCUSED BOND FUND, INC.

T. ROWE PRICE INFLATION PROTECTED BOND FUND, INC.

T. ROWE PRICE NEW INCOME FUND, INC.

T. ROWE PRICE PRIME RESERVE FUND, INC.

T. ROWE PRICE RESERVE INVESTMENT FUNDS, INC.

T. ROWE PRICE SHORT-TERM BOND FUND, INC.

T. ROWE PRICE STATE TAX-FREE INCOME TRUST

T. ROWE PRICE STRATEGIC INCOME FUND, INC.

T. ROWE PRICE SUMMIT FUNDS, INC.

T. ROWE PRICE SUMMIT MUNICIPAL FUNDS, INC.

T. ROWE PRICE TAX-EXEMPT MONEY FUND, INC.

T. ROWE PRICE TAX-FREE HIGH YIELD FUND, INC.

T. ROWE PRICE TAX-FREE INCOME FUND, INC.

T. ROWE PRICE TAX-FREE SHORT-INTERMEDIATE FUND, INC.

T. ROWE PRICE U.S. BOND INDEX FUND, INC.

T. ROWE PRICE U.S. TREASURY FUNDS, INC.

/s/Michael C. Gitlin Michael C. Gitlin April 20, 2011

(Signatures Continued)

Page 9

JOHN H. LAPORTE, Director/Trustee

T. ROWE PRICE CAPITAL OPPORTUNITY FUND, INC.

T. ROWE PRICE DIVERSIFIED MID-CAP GROWTH FUND, INC.

T. ROWE PRICE EQUITY SERIES, INC.

T. ROWE PRICE NEW AMERICA GROWTH FUND

T. ROWE PRICE SCIENCE & TECHNOLOGY FUND, INC.

T. ROWE PRICE SMALL-CAP STOCK FUND, INC.

T. ROWE PRICE SMALL-CAP VALUE FUND, INC.

JOHN H. LAPORTE, Director and Vice President

T. ROWE PRICE DIVERSIFIED SMALL-CAP GROWTH FUND, INC.

T. ROWE PRICE HEALTH SCIENCES FUND, INC.

T. ROWE PRICE NEW HORIZONS FUND, INC.

/s/John H. Laporte John H. Laporte April 20, 2011

(Signatures Continued)

Page 10

BRIAN C. ROGERS, Director/Trustee

T. ROWE PRICE BALANCED FUND, INC.

T. ROWE PRICE BLUE CHIP GROWTH FUND, INC.

T. ROWE PRICE CAPITAL APPRECIATION FUND

T. ROWE PRICE DIVIDEND GROWTH FUND, INC.

T. ROWE PRICE FINANCIAL SERVICES FUND, INC.

T. ROWE PRICE GLOBAL REAL ESTATE FUND, INC.

T. ROWE PRICE GLOBAL TECHNOLOGY FUND, INC.

T. ROWE PRICE GROWTH & INCOME FUND, INC.

T. ROWE PRICE GROWTH STOCK FUND, INC.

T. ROWE INDEX TRUST, INC.

T. ROWE PRICE INSTITUTIONAL INTERNATIONAL FUNDS, INC.

T. ROWE PRICE INTERNATIONAL FUNDS, INC.

T. ROWE PRICE INTERNATIONAL INDEX FUND, INC.

T. ROWE PRICE INTERNATIONAL SERIES, INC.

T. ROWE PRICE MEDIA & TELECOMMUNICATIONS FUND, INC.

T. ROWE PRICE MID-CAP GROWTH FUND, INC.

T. ROWE PRICE MID-CAP VALUE FUND, INC.

T. ROWE PRICE NEW ERA FUND, INC.

T. ROWE PRICE REAL ASSETS FUND, INC.

T. ROWE PRICE REAL ESTATE FUND, INC.

T. ROWE PRICE TAX-EFFICIENT FUNDS, INC.

T. ROWE PRICE U.S. LARGE-CAP CORE FUND, INC.

BRIAN C. ROGERS, Director/Trustee and President

T. ROWE PRICE EQUITY INCOME FUND

T. ROWE PRICE INSTITUTIONAL EQUITY FUNDS, INC.

BRIAN C. ROGERS, Director/Trustee and Vice President

T. ROWE PRICE PERSONAL STRATEGY FUNDS, INC.

T. ROWE PRICE RETIREMENT FUNDS, INC.

T. ROWE PRICE SPECTRUM FUND, INC.

T. ROWE PRICE VALUE FUND, INC.

/s/Brian C. Rogers Brian C. Rogers April 20, 2011

(Signatures Continued)

Page 11

ATTEST:

/s/Patricia B. Lippert

Patricia B. Lippert, Secretary

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

T. Rowe Price Institutional International Funds, Inc.

Prospectus Date

rr_ProspectusDate

Mar. 01, 2012

T. Rowe Price Institutional International Growth Equity Fund | T. Rowe Price Institutional International Growth Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)

rr_RedemptionFeeOverRedemption

2.00%

Management fee

rr_ManagementFeesOverAssets

0.70%

Other expenses

rr_OtherExpensesOverAssets

0.41%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.11%

Fee waiver/expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.36%

^[1]

Total annual fund operating expenses after fee waiver/expense reimbursement

rr_NetExpensesOverAssets

0.75%

^[1]

1 year

rr_ExpenseExampleYear01

77

3 years

rr_ExpenseExampleYear03

266

5 years

rr_ExpenseExampleYear05

527

10 years

rr_ExpenseExampleYear10

1,273

Annual Return 2002

rr_AnnualReturn2002

(17.65%)

Annual Return 2003

rr_AnnualReturn2003

31.70%

Annual Return 2004

rr_AnnualReturn2004

14.26%

Annual Return 2005

rr_AnnualReturn2005

16.67%

Annual Return 2006

rr_AnnualReturn2006

19.36%

Annual Return 2007

rr_AnnualReturn2007

12.25%

Annual Return 2008

rr_AnnualReturn2008

(48.57%)

Annual Return 2009

rr_AnnualReturn2009

51.17%

Annual Return 2010

rr_AnnualReturn2010

14.57%

Annual Return 2011

rr_AnnualReturn2011

(12.42%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

32.53%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(26.44%)

1 Year

rr_AverageAnnualReturnYear01

(12.42%)

5 Years

rr_AverageAnnualReturnYear05

(2.62%)

10 Years

rr_AverageAnnualReturnYear10

4.21%

T. Rowe Price Institutional International Growth Equity Fund | T. Rowe Price Institutional International Growth Equity Fund | Returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(12.56%)

5 Years

rr_AverageAnnualReturnYear05

(2.75%)

10 Years

rr_AverageAnnualReturnYear10

3.97%

T. Rowe Price Institutional International Growth Equity Fund | T. Rowe Price Institutional International Growth Equity Fund | Returns after taxes on distributions and sale of fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(7.61%)

5 Years

rr_AverageAnnualReturnYear05

(2.09%)

10 Years

rr_AverageAnnualReturnYear10

3.70%

T. Rowe Price Institutional International Growth Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

T. Rowe Price Institutional International Growth Equity Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks long-term growth of capital through investments primarily in the common stocks of established, non-U.S. companies.

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 Caption [Text]

rr_ShareholderFeesCaption

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

February 28, 2014

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 52.0% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

52.00%

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, the fund's operating expenses remain the same, and the expense limitation currently in place is not renewed. 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 expects to invest substantially all of its assets in stocks outside the U.S. and to diversify broadly among developed and emerging countries throughout the world. The fund may purchase the stocks of companies of any size, but its focus will typically be on large-sized companies and, to a lesser extent, medium-sized companies. Normally, at least 80% of the fund's net assets (including any borrowings for investment purposes) will be invested in stocks.

While the fund invests with an awareness of the global economic backdrop and the outlook for industry sectors and individual countries, bottom-up stock selection is the focus of our decision-making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects.

Security selection reflects a growth style. The fund relies on a global team of investment analysts dedicated to in-depth fundamental research in an effort to identify companies capable of achieving and sustaining above-average, long-term earnings growth. We seek to purchase stocks of such companies at reasonable prices in relation to present or anticipated earnings, cash flow, or book value.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:

·leading or improving market position;

·attractive business niche;

·attractive or improving franchise or industry position;

·seasoned management;

·stable or improving earnings and/or cash flow; and

·sound or improving balance sheet.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Investing in the securities of non-U.S. companies involves special risks not typically associated with investing in U.S. companies. 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, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, foreign investments are subject to settlement practices, and regulatory and financial reporting standards, that differ from those of the U.S. These risks are heightened for the fund's investments in emerging markets.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. The fund's growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices usually fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Risk Lose Money [Text]

rr_RiskLoseMoney

The fund's share price fluctuates, which means you could lose money by investing in the 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 [Heading]

rr_BarChartHeading

Institutional International Growth Equity Fund

Calendar Year Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

	QuarterEnded	TotalReturn
Best Quarter	6/30/09	32.53%
Worst Quarter	12/31/08	-26.44%

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 Growth Equity Fund | MSCI All Country World Index ex USA

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(13.33%)

5 Years

rr_AverageAnnualReturnYear05

(2.48%)

10 Years

rr_AverageAnnualReturnYear10

6.76%

T. Rowe Price Institutional International Growth Equity Fund | Lipper International Large-Cap Growth Funds Average

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(13.31%)

5 Years

rr_AverageAnnualReturnYear05

(3.13%)

10 Years

rr_AverageAnnualReturnYear10

4.37%

[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2014) to waive its fees and/or bear any expenses (excluding interest, taxes, brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund's ratio of expenses to average net assets to exceed 0.75%. Termination of the agreement would require approval by the fund's Board of Directors. Fees waived and expenses paid under this agreement (and a previous limitation of 0.75%) are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund's expense ratio is below 0.75%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 0.75%.

XML

T. Rowe Price Institutional International Core Equity Fund

T. Rowe Price Institutional International Core Equity Fund

Investment Objective

The fund seeks long-term growth of capital through investments in the common stocks of non-U.S. companies.

Fees and Expenses

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Shareholder Fees -	T. Rowe Price Institutional International Core Equity Fund
Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)	2.00%

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Annual Fund Operating Expenses -		T. Rowe Price Institutional International Core Equity Fund
Management fee		0.65%
Other expenses		0.52%
Total annual fund operating expenses		1.17%
Fee waiver/expense reimbursement	[1]	0.42%
Total annual fund operating expenses after fee waiver/expense reimbursement	[1]	0.75%

Example

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, the fund's operating expenses remain the same, and the expense limitation currently in place is not renewed. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example - (USD $)	1 year	3 years	5 years	10 years
T. Rowe Price Institutional International Core Equity Fund	77	315	589	1,370

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in 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 15.2% of the average value of its portfolio.

Investments, Risks, and Performance

Principal Investment Strategies

The fund expects to invest substantially all of its assets outside the U.S. and to diversify broadly among developed and, to a lesser extent, emerging countries throughout the world. The fund normally invests at least 80% of its net assets (including any borrowings for investment purposes) in non-U.S. stocks and at least 65% of its net assets in stocks of large-cap companies.

The fund takes a core approach to investing, which provides some exposure to both growth and value styles of investing. The fund relies on a global research team to search for particularly promising stocks throughout developed and, to a lesser extent, emerging markets. Securities will be selected that in our view have the most favorable combination of company fundamentals and valuation.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:

·attractive business niche with potential for earnings growth;

·attractive valuation relative to the company's peers or its own historical norm;

·barriers to entry;

·seasoned management;

·healthy balance sheet; and

·potential to grow dividends or conduct share repurchases.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

Principal Risks

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Investing in the securities of non-U.S. companies involves special risks not typically associated with investing in U.S. companies. 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, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, foreign investments are subject to settlement practices, and regulatory and financial reporting standards, that differ from those of the U.S. These risks are heightened for the fund's investments in emerging markets.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. Because the fund holds stocks with both growth and value characteristics, it could underperform other stock funds that take a strictly growth or value approach to investing when one style is currently in favor. Growth stocks tend to be more volatile than the overall stock market and can have sharp price declines as a result of earnings disappointments. Value stocks carry the risk that the market will not recognize their intrinsic value or that they are actually appropriately priced at a low level.

Performance

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 year depicted.

Institutional International Core Equity Fund

Calendar Year Returns

	Quarter Ended	Total Return
Best Quarter	12/31/11	5.82%
Worst Quarter	9/30/11	-20.68%

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.

Average Annual Total Returns

Periods ended

December 31, 2011

Average Annual Total Returns -	1 Year	Since inception	inception Date
T. Rowe Price Institutional International Core Equity Fund	(10.51%)	(5.53%)	Oct. 27, 2010
T. Rowe Price Institutional International Core Equity Fund Returns after taxes on distributions	(10.71%)	(5.72%)	Oct. 27, 2010
T. Rowe Price Institutional International Core Equity Fund Returns after taxes on distributions and sale of fund shares	(6.08%)	(4.49%)	Oct. 27, 2010
T. Rowe Price Institutional International Core Equity Fund MSCI EAFE Index	(11.73%)	(6.95%)
T. Rowe Price Institutional International Core Equity Fund Lipper International Large-Cap Core Funds Average	(12.61%)	(8.69%)

[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2013) to waive its fees and/or bear any expenses (excluding interest, taxes, brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund's ratio of expenses to average net assets to exceed 0.75%. Termination of the agreement would require approval by the fund's Board of Directors. Fees waived and expenses paid under this agreement are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund's expense ratio is below 0.75%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 0.75%.

XML

T. Rowe Price Institutional Concentrated International Equity Fund

T. Rowe Price Institutional Concentrated International Equity Fund

Investment Objective

The fund seeks long-term growth of capital through investments in stocks of non-U.S. companies.

Fees and Expenses

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Shareholder Fees -	T. Rowe Price Institutional Concentrated International Equity Fund
Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)	2.00%

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Annual Fund Operating Expenses -		T. Rowe Price Institutional Concentrated International Equity Fund
Management fee		0.65%
Other expenses		3.26%
Total annual fund operating expenses		3.91%
Fee waiver/expense reimbursement	[1]	3.16%
Total annual fund operating expenses after fee waiver/expense reimbursement	[1]	0.75%

Example

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, the fund's operating expenses remain the same, and the expense limitation currently in place is not renewed. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example - (USD $)	1 year	3 years	5 years	10 years
T. Rowe Price Institutional Concentrated International Equity Fund	77	797	1,648	3,858

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in 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 128.3% of the average value of its portfolio.

Investments, Risks, and Performance

Principal Investment Strategies

The fund expects to invest substantially all of its assets in stocks of companies located outside the U.S. Under normal conditions, the fund will invest at least 80% of its net assets (including any borrowings for investment purposes) in stocks of non-U.S. companies and no more than 15% of its net assets will be invested in stocks of companies in emerging markets.

The fund intends to invest in a relatively small number of holdings. Its portfolio is expected to be composed of investments in about 40 to 60 different stocks, although the number could vary depending on market conditions. The fund is "nondiversified," meaning it may invest a greater portion of assets in a single company and own more of the company's voting securities than is permissible for a "diversified" fund.

While the fund invests with an awareness of the global economic backdrop and the outlook for industry sectors and individual countries, bottom-up stock selection is the focus of our decision-making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects.

The fund may purchase the stocks of companies of any size and does not emphasize either a growth or value bias in selecting investments. Securities will be selected that in the investment adviser's view have the most favorable combination of company fundamentals, earnings potential, and relative valuation.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

Principal Risks

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Investing in the securities of non-U.S. companies involves special risks not typically associated with investing in U.S. companies. 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, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, foreign investments are subject to settlement practices, and regulatory and financial reporting standards, that differ from those of the U.S. These risks are heightened for the fund's investments in emerging markets.

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.

Performance

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.

Institutional Concentrated International Equity Fund

Calendar Year Returns

	Quarter Ended	Total Return
Best Quarter	12/31/11	5.36%
Worst Quarter	9/30/11	-15.73%

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.

Average Annual Total Returns

Periods ended

December 31, 2011

Average Annual Total Returns -	1 Year	Since inception	inception Date
T. Rowe Price Institutional Concentrated International Equity Fund	(6.58%)	2.66%	Jul. 27, 2010
T. Rowe Price Institutional Concentrated International Equity Fund Returns after taxes on distributions	(7.38%)	1.74%	Jul. 27, 2010
T. Rowe Price Institutional Concentrated International Equity Fund Returns after taxes on distributions and sale of fund shares	(3.56%)	2.02%	Jul. 27, 2010
T. Rowe Price Institutional Concentrated International Equity Fund MSCI EAFE Index	(11.73%)	0.14%
T. Rowe Price Institutional Concentrated International Equity Fund Lipper International Multi-Cap Growth Funds Average	(13.94%)	0.03%

[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2013) to waive its fees and/or bear any expenses (excluding interest, taxes, brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund's ratio of expenses to average net assets to exceed 0.75%. Termination of the agreement would require approval by the fund's Board of Directors. Fees waived and expenses paid under this agreement are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund's expense ratio is below 0.75%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 0.75%.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

T. Rowe Price Institutional International Funds, Inc.

Prospectus Date

rr_ProspectusDate

Mar. 01, 2012

T. Rowe Price Institutional International Core Equity Fund | T. Rowe Price Institutional International Core Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)

rr_RedemptionFeeOverRedemption

2.00%

Management fee

rr_ManagementFeesOverAssets

0.65%

Other expenses

rr_OtherExpensesOverAssets

0.52%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.17%

Fee waiver/expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.42%

^[1]

Total annual fund operating expenses after fee waiver/expense reimbursement

rr_NetExpensesOverAssets

0.75%

^[1]

1 year

rr_ExpenseExampleYear01

77

3 years

rr_ExpenseExampleYear03

315

5 years

rr_ExpenseExampleYear05

589

10 years

rr_ExpenseExampleYear10

1,370

Annual Return 2011

rr_AnnualReturn2011

(10.51%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2011

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

5.82%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(20.68%)

1 Year

rr_AverageAnnualReturnYear01

(10.51%)

Since inception

rr_AverageAnnualReturnSinceInception

(5.53%)

inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 27, 2010

T. Rowe Price Institutional International Core Equity Fund | T. Rowe Price Institutional International Core Equity Fund | Returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(10.71%)

Since inception

rr_AverageAnnualReturnSinceInception

(5.72%)

inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 27, 2010

T. Rowe Price Institutional International Core Equity Fund | T. Rowe Price Institutional International Core Equity Fund | Returns after taxes on distributions and sale of fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(6.08%)

Since inception

rr_AverageAnnualReturnSinceInception

(4.49%)

inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 27, 2010

T. Rowe Price Institutional International Core Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

T. Rowe Price Institutional International Core Equity Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks long-term growth of capital through investments in the common stocks of non-U.S. companies.

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 Caption [Text]

rr_ShareholderFeesCaption

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

February 28, 2013

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 15.2% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

15.20%

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, the fund's operating expenses remain the same, and the expense limitation currently in place is not renewed. 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 expects to invest substantially all of its assets outside the U.S. and to diversify broadly among developed and, to a lesser extent, emerging countries throughout the world. The fund normally invests at least 80% of its net assets (including any borrowings for investment purposes) in non-U.S. stocks and at least 65% of its net assets in stocks of large-cap companies.

The fund takes a core approach to investing, which provides some exposure to both growth and value styles of investing. The fund relies on a global research team to search for particularly promising stocks throughout developed and, to a lesser extent, emerging markets. Securities will be selected that in our view have the most favorable combination of company fundamentals and valuation.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:

·attractive business niche with potential for earnings growth;

·attractive valuation relative to the company's peers or its own historical norm;

·barriers to entry;

·seasoned management;

·healthy balance sheet; and

·potential to grow dividends or conduct share repurchases.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Investing in the securities of non-U.S. companies involves special risks not typically associated with investing in U.S. companies. 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, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, foreign investments are subject to settlement practices, and regulatory and financial reporting standards, that differ from those of the U.S. These risks are heightened for the fund's investments in emerging markets.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. Because the fund holds stocks with both growth and value characteristics, it could underperform other stock funds that take a strictly growth or value approach to investing when one style is currently in favor. Growth stocks tend to be more volatile than the overall stock market and can have sharp price declines as a result of earnings disappointments. Value stocks carry the risk that the market will not recognize their intrinsic value or that they are actually appropriately priced at a low level.

Risk Lose Money [Text]

rr_RiskLoseMoney

The fund's share price fluctuates, which means you could lose money by investing in the 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 year 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 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 [Heading]

rr_BarChartHeading

Institutional International Core Equity Fund

Calendar Year Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

	Quarter Ended	Total Return
Best Quarter	12/31/11	5.82%
Worst Quarter	9/30/11	-20.68%

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.

T. Rowe Price Institutional International Core Equity Fund | MSCI EAFE Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(11.73%)

Since inception

rr_AverageAnnualReturnSinceInception

(6.95%)

T. Rowe Price Institutional International Core Equity Fund | Lipper International Large-Cap Core Funds Average

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(12.61%)

Since inception

rr_AverageAnnualReturnSinceInception

(8.69%)

[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2013) to waive its fees and/or bear any expenses (excluding interest, taxes, brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund's ratio of expenses to average net assets to exceed 0.75%. Termination of the agreement would require approval by the fund's Board of Directors. Fees waived and expenses paid under this agreement are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund's expense ratio is below 0.75%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 0.75%.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

T. Rowe Price Institutional International Funds, Inc.

Prospectus Date

rr_ProspectusDate

Mar. 01, 2012

T. Rowe Price Institutional Global Equity Fund | T. Rowe Price Institutional Global Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)

rr_RedemptionFeeOverRedemption

2.00%

Management fee

rr_ManagementFeesOverAssets

0.65%

Other expenses

rr_OtherExpensesOverAssets

0.18%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.83%

Fee waiver/expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.08%

^[1]

Total annual fund operating expenses after fee waiver/expense reimbursement

rr_NetExpensesOverAssets

0.75%

^[1]

1 year

rr_ExpenseExampleYear01

77

3 years

rr_ExpenseExampleYear03

254

5 years

rr_ExpenseExampleYear05

450

10 years

rr_ExpenseExampleYear10

1,015

Annual Return 2007

rr_AnnualReturn2007

19.96%

Annual Return 2008

rr_AnnualReturn2008

(53.72%)

Annual Return 2009

rr_AnnualReturn2009

43.57%

Annual Return 2010

rr_AnnualReturn2010

12.44%

Annual Return 2011

rr_AnnualReturn2011

(11.31%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

22.81%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(33.18%)

1 Year

rr_AverageAnnualReturnYear01

(11.31%)

5 Years

rr_AverageAnnualReturnYear05

(4.49%)

Since inception

rr_AverageAnnualReturnSinceInception

(1.43%)

inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 2006

T. Rowe Price Institutional Global Equity Fund | T. Rowe Price Institutional Global Equity Fund | Returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(11.42%)

5 Years

rr_AverageAnnualReturnYear05

(4.76%)

Since inception

rr_AverageAnnualReturnSinceInception

(1.77%)

inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 2006

T. Rowe Price Institutional Global Equity Fund | T. Rowe Price Institutional Global Equity Fund | Returns after taxes on distributions and sale of fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(7.21%)

5 Years

rr_AverageAnnualReturnYear05

(3.85%)

Since inception

rr_AverageAnnualReturnSinceInception

(1.33%)

inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 2006

T. Rowe Price Institutional Global Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

T. Rowe Price Institutional Global Equity Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks long-term growth of capital through investments primarily in the common stocks of established companies throughout the world, including the U.S.

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 Caption [Text]

rr_ShareholderFeesCaption

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

February 28, 2013

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 82.4% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

82.40%

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, the fund's operating expenses remain the same, and the expense limitation currently in place is not renewed. 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 diversify broadly by investing in a variety of industries in developed and, to a lesser extent, emerging markets. The fund will normally invest in at least five countries, one of which will be the U.S. Under normal conditions, at least 40% of the fund's net assets will be invested in companies outside the U.S. (at least 30% of its net assets will be invested in companies outside the U.S. if foreign market conditions are not favorable). Although the fund can purchase stocks without regard to a company's market capitalization (shares outstanding multiplied by share price), investments will generally be in large- and medium-sized companies. The percentage of assets invested in U.S. and foreign stocks will normally be at least 80% of net assets (including any borrowings for investment purposes) and will vary over time according to the manager's outlook.

While the fund invests with an awareness of the global economic backdrop and the outlook for industry sectors and individual countries, bottom-up stock selection is the focus of our decision-making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects.

Security selection reflects a growth style. The fund relies on a global team of investment analysts dedicated to in-depth fundamental research in an effort to identify companies capable of achieving and sustaining above-average, long-term earnings growth. We seek to purchase stocks of such companies at reasonable prices in relation to present or anticipated earnings, cash flow, or book value.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:

·leading or improving market position;

·attractive business niche;

·attractive or improving franchise or industry position;

·seasoned management;

·stable or improving earnings and/or cash flow; and

·sound or improving balance sheet.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Since the fund can invest a sizable portion of its assets in foreign securities, it will be subject to the risk that some holdings may lose value because of declining foreign currencies, adverse political or economic developments overseas, illiquid trading markets, governmental interference, or regulatory practices that differ from the U.S. These risks are heightened for the fund's investments in emerging markets.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. The fund's growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices usually fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Risk Lose Money [Text]

rr_RiskLoseMoney

The fund's share price fluctuates, which means you could lose money by investing in the 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 [Heading]

rr_BarChartHeading

Institutional Global Equity Fund

Calendar year Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

	Quarter Ended	Total Return
Best Quarter	06/30/09	22.81%
Worst Quarter	12/31/08	-33.18%

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 Global Equity Fund | MSCI All Country World Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(6.86%)

5 Years

rr_AverageAnnualReturnYear05

(1.41%)

Since inception

rr_AverageAnnualReturnSinceInception

1.13%

T. Rowe Price Institutional Global Equity Fund | Lipper Global Large-Cap Growth Funds Average

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(7.50%)

5 Years

rr_AverageAnnualReturnYear05

(1.60%)

Since inception

rr_AverageAnnualReturnSinceInception

0.67%

[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2013) to waive its fees and/or bear any expenses (excluding interest, taxes, brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund's ratio of expenses to average net assets to exceed 0.75%. Termination of the agreement would require approval by the fund's Board of Directors. Fees waived and expenses paid under this agreement (and a previous limitation of 0.75%) are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund's expense ratio is below 0.75%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 0.75%.

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T. Rowe Price Institutional International Growth Equity Fund

T. Rowe Price Institutional International Growth Equity Fund

Investment Objective

The fund seeks long-term growth of capital through investments primarily in the common stocks of established, non-U.S. companies.

Fees and Expenses

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Shareholder Fees -	T. Rowe Price Institutional International Growth Equity Fund
Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)	2.00%

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Annual Fund Operating Expenses -		T. Rowe Price Institutional International Growth Equity Fund
Management fee		0.70%
Other expenses		0.41%
Total annual fund operating expenses		1.11%
Fee waiver/expense reimbursement	[1]	0.36%
Total annual fund operating expenses after fee waiver/expense reimbursement	[1]	0.75%

Example

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, the fund's operating expenses remain the same, and the expense limitation currently in place is not renewed. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example - (USD $)	1 year	3 years	5 years	10 years
T. Rowe Price Institutional International Growth Equity Fund	77	266	527	1,273

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in 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 52.0% of the average value of its portfolio.

Investments, Risks, and Performance

Principal Investment Strategies

The fund expects to invest substantially all of its assets in stocks outside the U.S. and to diversify broadly among developed and emerging countries throughout the world. The fund may purchase the stocks of companies of any size, but its focus will typically be on large-sized companies and, to a lesser extent, medium-sized companies. Normally, at least 80% of the fund's net assets (including any borrowings for investment purposes) will be invested in stocks.

While the fund invests with an awareness of the global economic backdrop and the outlook for industry sectors and individual countries, bottom-up stock selection is the focus of our decision-making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects.

Security selection reflects a growth style. The fund relies on a global team of investment analysts dedicated to in-depth fundamental research in an effort to identify companies capable of achieving and sustaining above-average, long-term earnings growth. We seek to purchase stocks of such companies at reasonable prices in relation to present or anticipated earnings, cash flow, or book value.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:

·leading or improving market position;

·attractive business niche;

·attractive or improving franchise or industry position;

·seasoned management;

·stable or improving earnings and/or cash flow; and

·sound or improving balance sheet.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

Principal Risks

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Investing in the securities of non-U.S. companies involves special risks not typically associated with investing in U.S. companies. 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, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, foreign investments are subject to settlement practices, and regulatory and financial reporting standards, that differ from those of the U.S. These risks are heightened for the fund's investments in emerging markets.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. The fund's growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices usually fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Performance

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.

Institutional International Growth Equity Fund

Calendar Year Returns

	QuarterEnded	TotalReturn
Best Quarter	6/30/09	32.53%
Worst Quarter	12/31/08	-26.44%

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.

Average Annual Total Returns

Periods ended

December 31, 2011

Average Annual Total Returns -	1 Year	5 Years	10 Years
T. Rowe Price Institutional International Growth Equity Fund	(12.42%)	(2.62%)	4.21%
T. Rowe Price Institutional International Growth Equity Fund Returns after taxes on distributions	(12.56%)	(2.75%)	3.97%
T. Rowe Price Institutional International Growth Equity Fund Returns after taxes on distributions and sale of fund shares	(7.61%)	(2.09%)	3.70%
T. Rowe Price Institutional International Growth Equity Fund MSCI All Country World Index ex USA	(13.33%)	(2.48%)	6.76%
T. Rowe Price Institutional International Growth Equity Fund Lipper International Large-Cap Growth Funds Average	(13.31%)	(3.13%)	4.37%

Updated performance information is available through troweprice.com or may be obtained by calling 1-800-638-8790.

[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2014) to waive its fees and/or bear any expenses (excluding interest, taxes, brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund's ratio of expenses to average net assets to exceed 0.75%. Termination of the agreement would require approval by the fund's Board of Directors. Fees waived and expenses paid under this agreement (and a previous limitation of 0.75%) are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund's expense ratio is below 0.75%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 0.75%.

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T. Rowe Price Institutional Global Large-Cap Equity Fund

T. Rowe Price Institutional Global Large-Cap Equity Fund

Investment Objective

The fund seeks long-term growth of capital through investments primarily in the common stocks of large-cap companies throughout the world, including the U.S.

Fees and Expenses

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Shareholder Fees -	T. Rowe Price Institutional Global Large-Cap Equity Fund
Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)	2.00%

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Annual Fund Operating Expenses -		T. Rowe Price Institutional Global Large-Cap Equity Fund
Management fee		0.65%
Other expenses		0.49%
Total annual fund operating expenses		1.14%
Fee waiver/expense reimbursement	[1]	0.39%
Total annual fund operating expenses after fee waiver/expense reimbursement	[1]	0.75%

Example

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, the fund's operating expenses remain the same, and the expense limitation currently in place is not renewed. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example - (USD $)	1 year	3 years	5 years	10 years
T. Rowe Price Institutional Global Large-Cap Equity Fund	77	310	577	1,339

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in 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 138.3% of the average value of its portfolio.

Investments, Risks, and Performance

Principal Investment Strategies

The fund will normally invest at least 80% of its net assets (including any borrowings for investment purposes) in stocks of large-cap companies. Under normal conditions, the fund will invest in at least five countries and at least 40% of its net assets will be invested in large-cap companies outside the U.S. (at least 30% of its net assets will be invested in large-cap companies outside the U.S. if foreign market conditions are not favorable).

The fund defines a large-cap company as one whose market capitalization (number of shares outstanding multiplied by share price) falls within or above the applicable range for companies included in the MSCI All Country World Index Large Cap. The fund's and MSCI Barra's definition of a large-cap company depends on whether the company is located in a developed market or an emerging market. As of December 31, 2011, the Index's market capitalization range for large-cap companies in developed markets was approximately $3.4 billion to $406.3 billion, and the market capitalization range for large-cap companies in emerging markets was approximately $1.8 billion to $278.0 billion. The fund also relies on MSCI Barra to classify a particular country as developed or emerging. The market capitalization of the companies in the fund's portfolio and the Index changes over time; the fund will not automatically sell or cease to purchase stock of a company it already owns just because the company's market capitalization falls below the range of the Index.

While the fund invests with an awareness of the global economic backdrop and the outlook for industry sectors and individual countries, bottom-up stock selection is the focus of our decision-making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects.

Security selection reflects a growth style. The fund relies on a global team of investment analysts dedicated to in-depth fundamental research in an effort to identify companies capable of achieving and sustaining above-average, long-term earnings growth. We seek to purchase stocks of such companies at reasonable prices in relation to present or anticipated earnings, cash flow, or book value.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:

·leading or improving market position;

·attractive business niche;

·attractive or improving franchise or industry position;

·seasoned management;

·stable or improving earnings and/or cash flow; and

·sound or improving balance sheet.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

Principal Risks

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Since the fund can invest a sizable portion of its assets in foreign securities, it will be subject to the risk that some holdings may lose value because of declining foreign currencies, adverse political or economic developments overseas, illiquid trading markets, governmental interference, or regulatory practices that differ from the U.S. These risks are heightened for the fund's investments in emerging markets.

Market capitalization risk Investing primarily in issuers within the same market capitalization category carries the risk that the category may be out of favor due to current market conditions or investor sentiment. Securities issued by large-cap companies tend to be less volatile than securities issued by smaller companies. However, larger companies may not be able to attain the high growth rates of successful smaller companies, especially during strong economic periods, and may be unable to respond as quickly to competitive challenges.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. The fund's growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices usually fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Performance

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.

Institutional Global Large-Cap Equity Fund

Calendar Year Returns

	Quarter Ended	Total Return
Best Quarter	6/30/09	27.42%
Worst Quarter	9/30/11	-19.59%

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.

Average Annual Total Returns

Periods ended

December 31, 2011

Average Annual Total Returns -	1 Year	Since inception	inception Date
T. Rowe Price Institutional Global Large-Cap Equity Fund	(10.28%)	21.77%	Oct. 27, 2008
T. Rowe Price Institutional Global Large-Cap Equity Fund Returns after taxes on distributions	(12.36%)	19.76%	Oct. 27, 2008
T. Rowe Price Institutional Global Large-Cap Equity Fund Returns after taxes on distributions and sale of fund shares	(5.75%)	18.06%	Oct. 27, 2008
T. Rowe Price Institutional Global Large-Cap Equity Fund MSCI All Country World Index Large Cap	(6.39%)	15.08%
T. Rowe Price Institutional Global Large-Cap Equity Fund Lipper Global Large-Cap Growth Funds Average	(7.50%)	9.48%

Updated performance information is available through troweprice.com or may be obtained by calling 1-800-638-8790.

[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2013) to waive its fees and/or bear any expenses (excluding interest, taxes, brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund's ratio of expenses to average net assets to exceed 0.75%. Termination of the agreement would require approval by the fund's Board of Directors. Fees waived and expenses paid under this agreement (and a previous limitation of 0.75%) are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund's expense ratio is below 0.75%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 0.75%.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

T. Rowe Price Institutional International Funds, Inc.

Prospectus Date

rr_ProspectusDate

Mar. 01, 2012

T. Rowe Price Institutional Africa & Middle East Fund | T. Rowe Price Institutional Africa & Middle East Fund

Risk/Return:

rr_RiskReturnAbstract

Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)

rr_RedemptionFeeOverRedemption

2.00%

Management fee

rr_ManagementFeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.29%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.29%

Fee waiver/expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.04%

^[1]

Total annual fund operating expenses after fee waiver/expense reimbursement

rr_NetExpensesOverAssets

1.25%

^[1]

1 year

rr_ExpenseExampleYear01

127

3 years

rr_ExpenseExampleYear03

404

5 years

rr_ExpenseExampleYear05

702

10 years

rr_ExpenseExampleYear10

1,552

Annual Return 2009

rr_AnnualReturn2009

27.65%

Annual Return 2010

rr_AnnualReturn2010

17.92%

Annual Return 2011

rr_AnnualReturn2011

(15.95%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

30.11%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2009

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(14.56%)

1 Year

rr_AverageAnnualReturnYear01

(15.95%)

Since inception

rr_AverageAnnualReturnSinceInception

(16.21%)

inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 30, 2008

T. Rowe Price Institutional Africa & Middle East Fund | T. Rowe Price Institutional Africa & Middle East Fund | Returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(16.40%)

Since inception

rr_AverageAnnualReturnSinceInception

(16.61%)

inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 30, 2008

T. Rowe Price Institutional Africa & Middle East Fund | T. Rowe Price Institutional Africa & Middle East Fund | Returns after taxes on distributions and sale of fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(10.22%)

Since inception

rr_AverageAnnualReturnSinceInception

(13.38%)

inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 30, 2008

T. Rowe Price Institutional Africa & Middle East Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

T. Rowe Price Institutional Africa & Middle
East Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks long-term growth of capital by investing primarily in the common stocks of companies located (or with primary operations) in Africa and the Middle East.

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 Caption [Text]

rr_ShareholderFeesCaption

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

February 28, 2013

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 97.0% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

97.00%

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, the fund's operating expenses remain the same, and the expense limitation currently in place is not renewed. 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% of its net assets (including any borrowings for investment purposes) in African and Middle Eastern companies. The fund may purchase the stocks of companies of any size. The fund expects to make substantially all of its investments in common stocks, and participation notes (P-notes) linked to common stocks, of companies located (or with primary operations) in the countries listed below, as well as others as their markets develop:

·Primary Emphasis: Bahrain, Egypt, Jordan, Kenya, Kuwait, Lebanon, Morocco, Nigeria, Oman, Qatar, Saudi Arabia, South Africa, and United Arab Emirates.

·Others: Algeria, Botswana, Ghana, Ivory Coast, Mauritius, Mozambique, Namibia, Syria, Tanzania, Tunisia, Zambia, and Zimbabwe.

The fund is "nondiversified," meaning it may invest a greater portion of assets in a single company and own more of the company's voting securities than is permissible for a "diversified" fund. The fund's portfolio is expected to be composed of investments in about 30 to 60 different companies, although the number could vary depending on market conditions. While most assets will be invested directly in common stocks, the fund may gain exposure to common stocks by purchasing
P-notes that offer a return linked to a particular underlying common stock. P-notes are primarily used to invest indirectly in certain stocks that trade in a market that restricts foreign investors, such as the fund, from investing directly in that market. The fund may make substantial investments (at times more than 25% of total assets) in telephone or banking companies in various African and Middle Eastern countries.

While the fund invests with an awareness of the outlook for industry sectors and individual countries within the region, bottom-up stock selection is the focus of our decision-making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects.

Security selection reflects a growth style. The fund relies on a global team of investment analysts dedicated to in-depth fundamental research in an effort to identify companies capable of achieving and sustaining above-average, long-term earnings growth. We seek to purchase stocks of such companies at reasonable prices in relation to present or anticipated earnings, cash flow, or book value.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:

·leading or improving market position;

·attractive business niche;

·attractive or improving franchise or industry position;

·seasoned management;

·stable or improving earnings and/or cash flow; and

·sound or improving balance sheet.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Investing in the securities of non-U.S. companies involves special risks not typically associated with investing in U.S. companies. 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, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, foreign investments are subject to settlement practices, and regulatory and financial reporting 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.

P-note risks To the extent the fund invests in P-notes, it is subject to certain risks in addition to the risks normally associated with a direct investment in the underlying foreign securities the P-note seeks to replicate. As the purchaser of a P-note, the fund is relying on the creditworthiness of the counterparty issuing the P-note and does not have the same rights under a P-note as it would as a shareholder of the underlying issuer. Therefore, if a counterparty becomes insolvent, the fund could lose the total value of its investment in the P-note. In addition, there is no assurance that there will be a trading market for a P-note or that the trading price of a P-note will equal the value of the underlying security.

Geographic concentration risk Because the fund concentrates its investments in a particular geographic region, the fund's performance is closely tied to the social, political, and economic conditions within that region. Political developments and changes in regulatory, tax, or economic policy in particular countries within the region could significantly affect the markets in those countries as well as the entire region. As a result, the fund is likely to be more volatile than more geographically diverse international funds.

Many African and Middle Eastern countries have histories of dictatorships, political and military unrest, and financial troubles, and their markets should be considered extremely volatile even when compared to those of other emerging market countries. Many of these countries tend to be highly reliant on the exportation of oil and other commodities so their economies can be significantly impacted by fluctuations in commodity prices and the global demand for certain commodities. In addition, because the fund may invest significantly in telephone and banking companies within the region, the fund is also more susceptible to developments affecting these industries.

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.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. The fund's growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices usually fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

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 [Heading]

rr_BarChartHeading

Institutional Africa & Middle East Fund

Calendar Year Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

	Quarter Ended	Total Return
Best Quarter	6/30/09	30.11%
Worst Quarter	3/31/09	-14.56%

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 Africa & Middle East Fund | S&P Emerging/Frontier ME & Africa BMI ex IL

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(12.68%)

Since inception

rr_AverageAnnualReturnSinceInception

(7.97%)

T. Rowe Price Institutional Africa & Middle East Fund | Combined Index Portfolio

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(12.68%)

^[2]

Since inception

rr_AverageAnnualReturnSinceInception

(6.17%)

^[2]

T. Rowe Price Institutional Africa & Middle East Fund | Lipper Emerging Markets Funds Average

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(20.30%)

Since inception

rr_AverageAnnualReturnSinceInception

(6.41%)

[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2013) to waive its fees and/or bear any expenses (excluding interest, taxes, brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund's ratio of expenses to average net assets to exceed 1.25%. Termination of the agreement would require approval by the fund's Board of Directors. Fees waived and expenses paid under this agreement (and a previous limitation of 1.25%) are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund's expense ratio is below 1.25%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 1.25%.

[2] Combined Index Portfolio is an unmanaged linked performance portfolio composed of: 100% S&P IFCG Africa & Middle East Index (excluding Saudi Arabia and Israel) through 6/30/09 (prior to 9/1/08, the index excluded Kuwait); 100% MSCI Arabian Markets & Africa Index from 7/1/09 through 9/29/10; and 100% S&P Emerging/Frontier ME & Africa BMI ex IL from 9/30/10 forward.

XML

T. Rowe Price Institutional Africa & Middle East Fund

T. Rowe Price Institutional Africa & Middle
East Fund

Investment Objective

The fund seeks long-term growth of capital by investing primarily in the common stocks of companies located (or with primary operations) in Africa and the Middle East.

Fees and Expenses

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Shareholder Fees -	T. Rowe Price Institutional Africa & Middle East Fund
Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)	2.00%

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Annual Fund Operating Expenses -		T. Rowe Price Institutional Africa & Middle East Fund
Management fee		1.00%
Other expenses		0.29%
Total annual fund operating expenses		1.29%
Fee waiver/expense reimbursement	[1]	0.04%
Total annual fund operating expenses after fee waiver/expense reimbursement	[1]	1.25%

Example

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, the fund's operating expenses remain the same, and the expense limitation currently in place is not renewed. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example - (USD $)	1 year	3 years	5 years	10 years
T. Rowe Price Institutional Africa & Middle East Fund	127	404	702	1,552

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in 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 97.0% of the average value of its portfolio.

Investments, Risks, and Performance

Principal Investment Strategies

The fund will normally invest at least 80% of its net assets (including any borrowings for investment purposes) in African and Middle Eastern companies. The fund may purchase the stocks of companies of any size. The fund expects to make substantially all of its investments in common stocks, and participation notes (P-notes) linked to common stocks, of companies located (or with primary operations) in the countries listed below, as well as others as their markets develop:

·Primary Emphasis: Bahrain, Egypt, Jordan, Kenya, Kuwait, Lebanon, Morocco, Nigeria, Oman, Qatar, Saudi Arabia, South Africa, and United Arab Emirates.

·Others: Algeria, Botswana, Ghana, Ivory Coast, Mauritius, Mozambique, Namibia, Syria, Tanzania, Tunisia, Zambia, and Zimbabwe.

The fund is "nondiversified," meaning it may invest a greater portion of assets in a single company and own more of the company's voting securities than is permissible for a "diversified" fund. The fund's portfolio is expected to be composed of investments in about 30 to 60 different companies, although the number could vary depending on market conditions. While most assets will be invested directly in common stocks, the fund may gain exposure to common stocks by purchasing
P-notes that offer a return linked to a particular underlying common stock. P-notes are primarily used to invest indirectly in certain stocks that trade in a market that restricts foreign investors, such as the fund, from investing directly in that market. The fund may make substantial investments (at times more than 25% of total assets) in telephone or banking companies in various African and Middle Eastern countries.

While the fund invests with an awareness of the outlook for industry sectors and individual countries within the region, bottom-up stock selection is the focus of our decision-making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects.

Security selection reflects a growth style. The fund relies on a global team of investment analysts dedicated to in-depth fundamental research in an effort to identify companies capable of achieving and sustaining above-average, long-term earnings growth. We seek to purchase stocks of such companies at reasonable prices in relation to present or anticipated earnings, cash flow, or book value.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:

·leading or improving market position;

·attractive business niche;

·attractive or improving franchise or industry position;

·seasoned management;

·stable or improving earnings and/or cash flow; and

·sound or improving balance sheet.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

Principal Risks

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Investing in the securities of non-U.S. companies involves special risks not typically associated with investing in U.S. companies. 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, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, foreign investments are subject to settlement practices, and regulatory and financial reporting 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.

P-note risks To the extent the fund invests in P-notes, it is subject to certain risks in addition to the risks normally associated with a direct investment in the underlying foreign securities the P-note seeks to replicate. As the purchaser of a P-note, the fund is relying on the creditworthiness of the counterparty issuing the P-note and does not have the same rights under a P-note as it would as a shareholder of the underlying issuer. Therefore, if a counterparty becomes insolvent, the fund could lose the total value of its investment in the P-note. In addition, there is no assurance that there will be a trading market for a P-note or that the trading price of a P-note will equal the value of the underlying security.

Geographic concentration risk Because the fund concentrates its investments in a particular geographic region, the fund's performance is closely tied to the social, political, and economic conditions within that region. Political developments and changes in regulatory, tax, or economic policy in particular countries within the region could significantly affect the markets in those countries as well as the entire region. As a result, the fund is likely to be more volatile than more geographically diverse international funds.

Many African and Middle Eastern countries have histories of dictatorships, political and military unrest, and financial troubles, and their markets should be considered extremely volatile even when compared to those of other emerging market countries. Many of these countries tend to be highly reliant on the exportation of oil and other commodities so their economies can be significantly impacted by fluctuations in commodity prices and the global demand for certain commodities. In addition, because the fund may invest significantly in telephone and banking companies within the region, the fund is also more susceptible to developments affecting these industries.

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.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. The fund's growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices usually fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Performance

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.

Institutional Africa & Middle East Fund

Calendar Year Returns

	Quarter Ended	Total Return
Best Quarter	6/30/09	30.11%
Worst Quarter	3/31/09	-14.56%

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.

Average Annual Total Returns

Periods ended

December 31, 2011

Average Annual Total Returns -		1 Year	Since inception	inception Date
T. Rowe Price Institutional Africa & Middle East Fund		(15.95%)	(16.21%)	Apr. 30, 2008
T. Rowe Price Institutional Africa & Middle East Fund Returns after taxes on distributions		(16.40%)	(16.61%)	Apr. 30, 2008
T. Rowe Price Institutional Africa & Middle East Fund Returns after taxes on distributions and sale of fund shares		(10.22%)	(13.38%)	Apr. 30, 2008
T. Rowe Price Institutional Africa & Middle East Fund S&P Emerging/Frontier ME & Africa BMI ex IL		(12.68%)	(7.97%)
T. Rowe Price Institutional Africa & Middle East Fund Combined Index Portfolio	[1]	(12.68%)	(6.17%)
T. Rowe Price Institutional Africa & Middle East Fund Lipper Emerging Markets Funds Average		(20.30%)	(6.41%)

Updated performance information is available through troweprice.com or may be obtained by calling 1-800-638-8790.

[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2013) to waive its fees and/or bear any expenses (excluding interest, taxes, brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund's ratio of expenses to average net assets to exceed 1.25%. Termination of the agreement would require approval by the fund's Board of Directors. Fees waived and expenses paid under this agreement (and a previous limitation of 1.25%) are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund's expense ratio is below 1.25%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 1.25%.

[1] Combined Index Portfolio is an unmanaged linked performance portfolio composed of: 100% S&P IFCG Africa & Middle East Index (excluding Saudi Arabia and Israel) through 6/30/09 (prior to 9/1/08, the index excluded Kuwait); 100% MSCI Arabian Markets & Africa Index from 7/1/09 through 9/29/10; and 100% S&P Emerging/Frontier ME & Africa BMI ex IL from 9/30/10 forward.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

T. Rowe Price Institutional International Funds, Inc.

Prospectus Date

rr_ProspectusDate

Mar. 01, 2012

T. Rowe Price Institutional Emerging Markets Equity Fund | T. Rowe Price Institutional Emerging Markets Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)

rr_RedemptionFeeOverRedemption

2.00%

Management fees

rr_ManagementFeesOverAssets

1.10%

Other expenses

rr_OtherExpensesOverAssets

none

Total annual fund operating expenses

rr_ExpensesOverAssets

1.10%

1 year

rr_ExpenseExampleYear01

112

3 years

rr_ExpenseExampleYear03

350

5 years

rr_ExpenseExampleYear05

606

10 years

rr_ExpenseExampleYear10

1,340

Annual Return 2003

rr_AnnualReturn2003

51.58%

Annual Return 2004

rr_AnnualReturn2004

27.04%

Annual Return 2005

rr_AnnualReturn2005

37.98%

Annual Return 2006

rr_AnnualReturn2006

31.99%

Annual Return 2007

rr_AnnualReturn2007

43.40%

Annual Return 2008

rr_AnnualReturn2008

(61.07%)

Annual Return 2009

rr_AnnualReturn2009

86.38%

Annual Return 2010

rr_AnnualReturn2010

19.25%

Annual Return 2011

rr_AnnualReturn2011

(18.63%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

42.94%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(34.27%)

1 Year

rr_AverageAnnualReturnYear01

(18.63%)

5 Years

rr_AverageAnnualReturnYear05

0.19%

Since inception

rr_AverageAnnualReturnSinceInception

15.01%

inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2002

T. Rowe Price Institutional Emerging Markets Equity Fund | T. Rowe Price Institutional Emerging Markets Equity Fund | Returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(18.57%)

5 Years

rr_AverageAnnualReturnYear05

(0.23%)

Since inception

rr_AverageAnnualReturnSinceInception

14.46%

inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2002

T. Rowe Price Institutional Emerging Markets Equity Fund | T. Rowe Price Institutional Emerging Markets Equity Fund | Returns after taxes on distributions and sale of fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(11.88%)

5 Years

rr_AverageAnnualReturnYear05

0.31%

Since inception

rr_AverageAnnualReturnSinceInception

13.61%

inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2002

T. Rowe Price Institutional Emerging Markets Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

T. Rowe Price Institutional Emerging Markets Equity Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks long-term growth of capital through investments primarily in the common stocks of companies located (or with primary operations) in emerging markets.

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 Caption [Text]

rr_ShareholderFeesCaption

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells 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 24.3% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

24.30%

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% of its net assets (including any borrowings for investment purposes) in emerging market companies. The fund may purchase the stocks of companies of any size. The fund expects to make substantially all of its investments in common stocks of companies located (or with primary operations) in emerging markets in Latin America, Asia, Europe, Africa, and the Middle East. The fund considers the following countries to be emerging markets (others may be added):

·Asia: China, India, Indonesia, Malaysia, Pakistan, Philippines, South Korea, Sri Lanka, Taiwan, Thailand, and Vietnam.

·Latin America: Argentina, Belize, Brazil, Chile, Colombia, Mexico, Panama, Peru, and Venezuela.

·Europe: Croatia, Czech Republic, Estonia, Hungary, Kazakhstan, Latvia, Lithuania, Poland, Romania, Russia, Slovakia, Slovenia, Turkey, and Ukraine.

·Africa and the Middle East: Bahrain, Botswana, Egypt, Jordan, Kenya, Kuwait, Lebanon, Mauritius, Morocco, Nigeria, Oman, Qatar, Saudi Arabia, South Africa, Tunisia, United Arab Emirates, and Zimbabwe.

While the fund invests with an awareness of the global economic backdrop and the outlook for industry sectors and individual countries, bottom-up stock selection is the focus of our decision-making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects.

Security selection reflects a growth style. The fund relies on a global team of investment analysts dedicated to in-depth fundamental research in an effort to identify companies capable of achieving and sustaining above-average, long-term earnings growth. We seek to purchase stocks of such companies at reasonable prices in relation to present or anticipated earnings, cash flow, or book value.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:

·leading or improving market position;

·attractive business niche;

·attractive or improving franchise or industry position;

·seasoned management;

·stable or improving earnings and/or cash flow; and

·sound or improving balance sheet.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Investing in the securities of non-U.S. companies involves special risks not typically associated with investing in U.S. companies. 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, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, foreign investments are subject to settlement practices, and regulatory and financial reporting 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.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. The fund's growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices usually fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Risk Lose Money [Text]

rr_RiskLoseMoney

The fund's share price fluctuates, which means you could lose money by investing in the 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 [Heading]

rr_BarChartHeading

Institutional Emerging Markets Equity Fund

Calendar Year Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

	Quarter Ended	Total Return
Best Quarter	6/30/09	42.94%
Worst Quarter	12/31/08	-34.27%

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 Equity Fund | MSCI Emerging Markets Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(18.17%)

5 Years

rr_AverageAnnualReturnYear05

2.70%

Since inception

rr_AverageAnnualReturnSinceInception

16.78%

T. Rowe Price Institutional Emerging Markets Equity Fund | Lipper Emerging Markets Funds Average

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(20.30%)

5 Years

rr_AverageAnnualReturnYear05

0.35%

Since inception

rr_AverageAnnualReturnSinceInception

15.10%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

T. Rowe Price Institutional International Funds, Inc.

Prospectus Date

rr_ProspectusDate

Mar. 01, 2012

T. Rowe Price Institutional Global Large-Cap Equity Fund | T. Rowe Price Institutional Global Large-Cap Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)

rr_RedemptionFeeOverRedemption

2.00%

Management fee

rr_ManagementFeesOverAssets

0.65%

Other expenses

rr_OtherExpensesOverAssets

0.49%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.14%

Fee waiver/expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

0.39%

^[1]

Total annual fund operating expenses after fee waiver/expense reimbursement

rr_NetExpensesOverAssets

0.75%

^[1]

1 year

rr_ExpenseExampleYear01

77

3 years

rr_ExpenseExampleYear03

310

5 years

rr_ExpenseExampleYear05

577

10 years

rr_ExpenseExampleYear10

1,339

Annual Return 2009

rr_AnnualReturn2009

50.15%

Annual Return 2010

rr_AnnualReturn2010

14.52%

Annual Return 2011

rr_AnnualReturn2011

(10.28%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

27.42%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.59%)

1 Year

rr_AverageAnnualReturnYear01

(10.28%)

Since inception

rr_AverageAnnualReturnSinceInception

21.77%

inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 27, 2008

T. Rowe Price Institutional Global Large-Cap Equity Fund | T. Rowe Price Institutional Global Large-Cap Equity Fund | Returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(12.36%)

Since inception

rr_AverageAnnualReturnSinceInception

19.76%

inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 27, 2008

T. Rowe Price Institutional Global Large-Cap Equity Fund | T. Rowe Price Institutional Global Large-Cap Equity Fund | Returns after taxes on distributions and sale of fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(5.75%)

Since inception

rr_AverageAnnualReturnSinceInception

18.06%

inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 27, 2008

T. Rowe Price Institutional Global Large-Cap Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

T. Rowe Price Institutional Global Large-Cap Equity Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks long-term growth of capital through investments primarily in the common stocks of large-cap companies throughout the world, including the U.S.

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 Caption [Text]

rr_ShareholderFeesCaption

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

February 28, 2013

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 138.3% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

138.30%

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, the fund's operating expenses remain the same, and the expense limitation currently in place is not renewed. 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% of its net assets (including any borrowings for investment purposes) in stocks of large-cap companies. Under normal conditions, the fund will invest in at least five countries and at least 40% of its net assets will be invested in large-cap companies outside the U.S. (at least 30% of its net assets will be invested in large-cap companies outside the U.S. if foreign market conditions are not favorable).

The fund defines a large-cap company as one whose market capitalization (number of shares outstanding multiplied by share price) falls within or above the applicable range for companies included in the MSCI All Country World Index Large Cap. The fund's and MSCI Barra's definition of a large-cap company depends on whether the company is located in a developed market or an emerging market. As of December 31, 2011, the Index's market capitalization range for large-cap companies in developed markets was approximately $3.4 billion to $406.3 billion, and the market capitalization range for large-cap companies in emerging markets was approximately $1.8 billion to $278.0 billion. The fund also relies on MSCI Barra to classify a particular country as developed or emerging. The market capitalization of the companies in the fund's portfolio and the Index changes over time; the fund will not automatically sell or cease to purchase stock of a company it already owns just because the company's market capitalization falls below the range of the Index.

While the fund invests with an awareness of the global economic backdrop and the outlook for industry sectors and individual countries, bottom-up stock selection is the focus of our decision-making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects.

Security selection reflects a growth style. The fund relies on a global team of investment analysts dedicated to in-depth fundamental research in an effort to identify companies capable of achieving and sustaining above-average, long-term earnings growth. We seek to purchase stocks of such companies at reasonable prices in relation to present or anticipated earnings, cash flow, or book value.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:

·leading or improving market position;

·attractive business niche;

·attractive or improving franchise or industry position;

·seasoned management;

·stable or improving earnings and/or cash flow; and

·sound or improving balance sheet.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Since the fund can invest a sizable portion of its assets in foreign securities, it will be subject to the risk that some holdings may lose value because of declining foreign currencies, adverse political or economic developments overseas, illiquid trading markets, governmental interference, or regulatory practices that differ from the U.S. These risks are heightened for the fund's investments in emerging markets.

Market capitalization risk Investing primarily in issuers within the same market capitalization category carries the risk that the category may be out of favor due to current market conditions or investor sentiment. Securities issued by large-cap companies tend to be less volatile than securities issued by smaller companies. However, larger companies may not be able to attain the high growth rates of successful smaller companies, especially during strong economic periods, and may be unable to respond as quickly to competitive challenges.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. The fund's growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices usually fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Risk Lose Money [Text]

rr_RiskLoseMoney

The fund's share price fluctuates, which means you could lose money by investing in the 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 [Heading]

rr_BarChartHeading

Institutional Global Large-Cap Equity Fund

Calendar Year Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

	Quarter Ended	Total Return
Best Quarter	6/30/09	27.42%
Worst Quarter	9/30/11	-19.59%

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 Global Large-Cap Equity Fund | MSCI All Country World Index Large Cap

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(6.39%)

Since inception

rr_AverageAnnualReturnSinceInception

15.08%

T. Rowe Price Institutional Global Large-Cap Equity Fund | Lipper Global Large-Cap Growth Funds Average

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(7.50%)

Since inception

rr_AverageAnnualReturnSinceInception

9.48%

[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2013) to waive its fees and/or bear any expenses (excluding interest, taxes, brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund's ratio of expenses to average net assets to exceed 0.75%. Termination of the agreement would require approval by the fund's Board of Directors. Fees waived and expenses paid under this agreement (and a previous limitation of 0.75%) are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund's expense ratio is below 0.75%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 0.75%.

XML

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Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Oct. 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	Feb. 27, 2012
Document Effective Date	dei_DocumentEffectiveDate	Mar. 01, 2012
Prospectus Date	rr_ProspectusDate	Mar. 01, 2012

XML

T. Rowe Price Institutional Global Equity Fund

T. Rowe Price Institutional Global Equity Fund

Investment Objective

The fund seeks long-term growth of capital through investments primarily in the common stocks of established companies throughout the world, including the U.S.

Fees and Expenses

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Shareholder Fees -	T. Rowe Price Institutional Global Equity Fund
Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)	2.00%

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Annual Fund Operating Expenses -		T. Rowe Price Institutional Global Equity Fund
Management fee		0.65%
Other expenses		0.18%
Total annual fund operating expenses		0.83%
Fee waiver/expense reimbursement	[1]	0.08%
Total annual fund operating expenses after fee waiver/expense reimbursement	[1]	0.75%

Example

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, the fund's operating expenses remain the same, and the expense limitation currently in place is not renewed. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example - (USD $)	1 year	3 years	5 years	10 years
T. Rowe Price Institutional Global Equity Fund	77	254	450	1,015

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in 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 82.4% of the average value of its portfolio.

Investments, Risks, and Performance

Principal Investment Strategies

The fund will diversify broadly by investing in a variety of industries in developed and, to a lesser extent, emerging markets. The fund will normally invest in at least five countries, one of which will be the U.S. Under normal conditions, at least 40% of the fund's net assets will be invested in companies outside the U.S. (at least 30% of its net assets will be invested in companies outside the U.S. if foreign market conditions are not favorable). Although the fund can purchase stocks without regard to a company's market capitalization (shares outstanding multiplied by share price), investments will generally be in large- and medium-sized companies. The percentage of assets invested in U.S. and foreign stocks will normally be at least 80% of net assets (including any borrowings for investment purposes) and will vary over time according to the manager's outlook.

While the fund invests with an awareness of the global economic backdrop and the outlook for industry sectors and individual countries, bottom-up stock selection is the focus of our decision-making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects.

Security selection reflects a growth style. The fund relies on a global team of investment analysts dedicated to in-depth fundamental research in an effort to identify companies capable of achieving and sustaining above-average, long-term earnings growth. We seek to purchase stocks of such companies at reasonable prices in relation to present or anticipated earnings, cash flow, or book value.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:

·leading or improving market position;

·attractive business niche;

·attractive or improving franchise or industry position;

·seasoned management;

·stable or improving earnings and/or cash flow; and

·sound or improving balance sheet.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

Principal Risks

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Since the fund can invest a sizable portion of its assets in foreign securities, it will be subject to the risk that some holdings may lose value because of declining foreign currencies, adverse political or economic developments overseas, illiquid trading markets, governmental interference, or regulatory practices that differ from the U.S. These risks are heightened for the fund's investments in emerging markets.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. The fund's growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices usually fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Performance

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.

Institutional Global Equity Fund

Calendar year Returns

	Quarter Ended	Total Return
Best Quarter	06/30/09	22.81%
Worst Quarter	12/31/08	-33.18%

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.

Average Annual Total Returns

Periods ended

December 31, 2011

Average Annual Total Returns -	1 Year	5 Years	Since inception	inception Date
T. Rowe Price Institutional Global Equity Fund	(11.31%)	(4.49%)	(1.43%)	Jun. 30, 2006
T. Rowe Price Institutional Global Equity Fund Returns after taxes on distributions	(11.42%)	(4.76%)	(1.77%)	Jun. 30, 2006
T. Rowe Price Institutional Global Equity Fund Returns after taxes on distributions and sale of fund shares	(7.21%)	(3.85%)	(1.33%)	Jun. 30, 2006
T. Rowe Price Institutional Global Equity Fund MSCI All Country World Index	(6.86%)	(1.41%)	1.13%
T. Rowe Price Institutional Global Equity Fund Lipper Global Large-Cap Growth Funds Average	(7.50%)	(1.60%)	0.67%

Updated performance information is available through troweprice.com or may be obtained by calling 1-800-638-8790.

[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2013) to waive its fees and/or bear any expenses (excluding interest, taxes, brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund's ratio of expenses to average net assets to exceed 0.75%. Termination of the agreement would require approval by the fund's Board of Directors. Fees waived and expenses paid under this agreement (and a previous limitation of 0.75%) are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund's expense ratio is below 0.75%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 0.75%.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

T. Rowe Price Institutional International Funds, Inc.

Prospectus Date

rr_ProspectusDate

Mar. 01, 2012

T. Rowe Price Institutional Concentrated International Equity Fund | T. Rowe Price Institutional Concentrated International Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)

rr_RedemptionFeeOverRedemption

2.00%

Management fee

rr_ManagementFeesOverAssets

0.65%

Other expenses

rr_OtherExpensesOverAssets

3.26%

Total annual fund operating expenses

rr_ExpensesOverAssets

3.91%

Fee waiver/expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

3.16%

^[1]

Total annual fund operating expenses after fee waiver/expense reimbursement

rr_NetExpensesOverAssets

0.75%

^[1]

1 year

rr_ExpenseExampleYear01

77

3 years

rr_ExpenseExampleYear03

797

5 years

rr_ExpenseExampleYear05

1,648

10 years

rr_ExpenseExampleYear10

3,858

Annual Return 2011

rr_AnnualReturn2011

(6.58%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2011

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

5.36%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(15.73%)

1 Year

rr_AverageAnnualReturnYear01

(6.58%)

Since inception

rr_AverageAnnualReturnSinceInception

2.66%

inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 27, 2010

T. Rowe Price Institutional Concentrated International Equity Fund | T. Rowe Price Institutional Concentrated International Equity Fund | Returns after taxes on distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(7.38%)

Since inception

rr_AverageAnnualReturnSinceInception

1.74%

inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 27, 2010

T. Rowe Price Institutional Concentrated International Equity Fund | T. Rowe Price Institutional Concentrated International Equity Fund | Returns after taxes on distributions and sale of fund shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(3.56%)

Since inception

rr_AverageAnnualReturnSinceInception

2.02%

inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 27, 2010

T. Rowe Price Institutional Concentrated International Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

T. Rowe Price Institutional Concentrated International Equity Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks long-term growth of capital through investments in stocks of non-U.S. companies.

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 Caption [Text]

rr_ShareholderFeesCaption

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

February 28, 2013

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 128.3% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

128.30%

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, the fund's operating expenses remain the same, and the expense limitation currently in place is not renewed. 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 expects to invest substantially all of its assets in stocks of companies located outside the U.S. Under normal conditions, the fund will invest at least 80% of its net assets (including any borrowings for investment purposes) in stocks of non-U.S. companies and no more than 15% of its net assets will be invested in stocks of companies in emerging markets.

The fund intends to invest in a relatively small number of holdings. Its portfolio is expected to be composed of investments in about 40 to 60 different stocks, although the number could vary depending on market conditions. The fund is "nondiversified," meaning it may invest a greater portion of assets in a single company and own more of the company's voting securities than is permissible for a "diversified" fund.

While the fund invests with an awareness of the global economic backdrop and the outlook for industry sectors and individual countries, bottom-up stock selection is the focus of our decision-making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects.

The fund may purchase the stocks of companies of any size and does not emphasize either a growth or value bias in selecting investments. Securities will be selected that in the investment adviser's view have the most favorable combination of company fundamentals, earnings potential, and relative valuation.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Investing in the securities of non-U.S. companies involves special risks not typically associated with investing in U.S. companies. 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, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, foreign investments are subject to settlement practices, and regulatory and financial reporting standards, that differ from those of the U.S. These risks are heightened for the fund's investments in emerging markets.

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.

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 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 [Heading]

rr_BarChartHeading

Institutional Concentrated International Equity Fund

Calendar Year Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

	Quarter Ended	Total Return
Best Quarter	12/31/11	5.36%
Worst Quarter	9/30/11	-15.73%

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.

T. Rowe Price Institutional Concentrated International Equity Fund | MSCI EAFE Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(11.73%)

Since inception

rr_AverageAnnualReturnSinceInception

0.14%

T. Rowe Price Institutional Concentrated International Equity Fund | Lipper International Multi-Cap Growth Funds Average

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(13.94%)

Since inception

rr_AverageAnnualReturnSinceInception

0.03%

[1] T. Rowe Price Associates, Inc. has agreed (through February 28, 2013) to waive its fees and/or bear any expenses (excluding interest, taxes, brokerage, extraordinary expenses, and acquired fund fees) that would cause the fund's ratio of expenses to average net assets to exceed 0.75%. Termination of the agreement would require approval by the fund's Board of Directors. Fees waived and expenses paid under this agreement are subject to reimbursement to T. Rowe Price Associates, Inc. by the fund whenever the fund's expense ratio is below 0.75%. However, no reimbursement will be made more than three years after the waiver or payment, or if it would result in the expense ratio exceeding 0.75%.

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T. Rowe Price Institutional Emerging Markets Equity Fund

T. Rowe Price Institutional Emerging Markets Equity Fund

Investment Objective

The fund seeks long-term growth of capital through investments primarily in the common stocks of companies located (or with primary operations) in emerging markets.

Fees and Expenses

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Shareholder Fees -	T. Rowe Price Institutional Emerging Markets Equity Fund
Redemption fee (as a percentage of amount redeemed on shares held for 90 days or less)	2.00%

Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Annual Fund Operating Expenses -	T. Rowe Price Institutional Emerging Markets Equity Fund
Management fees	1.10%
Other expenses	none
Total annual fund operating expenses	1.10%

Example

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:

Expense Example - (USD $)	1 year	3 years	5 years	10 years
T. Rowe Price Institutional Emerging Markets Equity Fund	112	350	606	1,340

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in 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 24.3% of the average value of its portfolio.

Investments, Risks, and Performance

Principal Investment Strategies

The fund will normally invest at least 80% of its net assets (including any borrowings for investment purposes) in emerging market companies. The fund may purchase the stocks of companies of any size. The fund expects to make substantially all of its investments in common stocks of companies located (or with primary operations) in emerging markets in Latin America, Asia, Europe, Africa, and the Middle East. The fund considers the following countries to be emerging markets (others may be added):

·Asia: China, India, Indonesia, Malaysia, Pakistan, Philippines, South Korea, Sri Lanka, Taiwan, Thailand, and Vietnam.

·Latin America: Argentina, Belize, Brazil, Chile, Colombia, Mexico, Panama, Peru, and Venezuela.

·Europe: Croatia, Czech Republic, Estonia, Hungary, Kazakhstan, Latvia, Lithuania, Poland, Romania, Russia, Slovakia, Slovenia, Turkey, and Ukraine.

·Africa and the Middle East: Bahrain, Botswana, Egypt, Jordan, Kenya, Kuwait, Lebanon, Mauritius, Morocco, Nigeria, Oman, Qatar, Saudi Arabia, South Africa, Tunisia, United Arab Emirates, and Zimbabwe.

While the fund invests with an awareness of the global economic backdrop and the outlook for industry sectors and individual countries, bottom-up stock selection is the focus of our decision-making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects.

Security selection reflects a growth style. The fund relies on a global team of investment analysts dedicated to in-depth fundamental research in an effort to identify companies capable of achieving and sustaining above-average, long-term earnings growth. We seek to purchase stocks of such companies at reasonable prices in relation to present or anticipated earnings, cash flow, or book value.

In selecting investments, the fund generally favors companies with one or more of the following characteristics:

·leading or improving market position;

·attractive business niche;

·attractive or improving franchise or industry position;

·seasoned management;

·stable or improving earnings and/or cash flow; and

·sound or improving balance sheet.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

Principal Risks

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 riskThe 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.

Risks of stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the stock market or because of factors that affect a company or a particular industry.

Foreign investing risk Investing in the securities of non-U.S. companies involves special risks not typically associated with investing in U.S. companies. 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, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, foreign investments are subject to settlement practices, and regulatory and financial reporting 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.

Investment style risk Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment. The fund's growth approach to investing could cause it to underperform other stock funds that employ a different investment style. Growth stocks tend to be more volatile than certain other types of stocks and their prices usually fluctuate more dramatically than the overall stock market. A stock with growth characteristics can have sharp price declines due to decreases in current or expected earnings and may lack dividends that can help cushion its share price in a declining market.

Performance

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.

Institutional Emerging Markets Equity Fund

Calendar Year Returns

	Quarter Ended	Total Return
Best Quarter	6/30/09	42.94%
Worst Quarter	12/31/08	-34.27%

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.

Average Annual Total Returns

Periods ended

December 31, 2011

Average Annual Total Returns -	1 Year	5 Years	Since inception	inception Date
T. Rowe Price Institutional Emerging Markets Equity Fund	(18.63%)	0.19%	15.01%	Oct. 31, 2002
T. Rowe Price Institutional Emerging Markets Equity Fund Returns after taxes on distributions	(18.57%)	(0.23%)	14.46%	Oct. 31, 2002
T. Rowe Price Institutional Emerging Markets Equity Fund Returns after taxes on distributions and sale of fund shares	(11.88%)	0.31%	13.61%	Oct. 31, 2002
T. Rowe Price Institutional Emerging Markets Equity Fund MSCI Emerging Markets Index	(18.17%)	2.70%	16.78%
T. Rowe Price Institutional Emerging Markets Equity Fund Lipper Emerging Markets Funds Average	(20.30%)	0.35%	15.10%

Updated performance information is available through troweprice.com or may be obtained by calling 1-800-638-8790.

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Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Prospectus Date	rr_ProspectusDate	Mar. 01, 2012