485BPOS

As Filed with the U.S. Securities and Exchange Commission on August 16, 2013

1933 Act File No. 033-39242

1940 Act File No. 811-06247

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549
__________________
FORM N-1A
__________________
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933		☒
Pre-Effective Amendment No.		☐
Post-Effective Amendment No. 59		☒
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940		☒
Amendment No. 59		☒
(Check appropriate box or boxes.)
__________________
AMERICAN CENTURY WORLD MUTUAL FUNDS, INC. (Exact Name of Registrant as Specified in Charter)
__________________
4500 MAIN STREET, KANSAS CITY, MISSOURI 64111 (Address of Principal Executive Offices)(Zip Code)
REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (816) 531-5575
CHARLES A. ETHERINGTON 4500 MAIN STREET, KANSAS CITY, MISSOURI 64111 (Name and Address of Agent for Service)
It is proposed that this filing will become effective (check appropriate box)
☑	immediately upon filing pursuant to paragraph (b)
☐	on (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.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement amendment pursuant to Rule 485(b) promulgated under the Securities Act of 1933, as amended, and has duly caused this amendment to be signed on its behalf by the undersigned, duly authorized, in the City of Kansas City, State of Missouri on the 16th day of August, 2013.

American Century World Mutual Funds, Inc. 

(Registrant)

By:

*

___________________________________

Jonathan S. Thomas

President

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

SIGNATURES	TITLE	DATE
* _________________________________ Jonathan S. Thomas	President and Director	August 16, 2013
* _________________________________ C. Jean Wade	Vice President, Treasurer and Chief Financial Officer	August 16, 2013
* _________________________________ Barry Fink	Director	August 16, 2013
* _________________________________ Thomas A. Brown	Director	August 16, 2013
* _________________________________ Andrea C. Hall, Ph.D.	Director	August 16, 2013
* _________________________________ Jan M. Lewis	Director	August 16, 2013
* _________________________________ James A. Olson	Director	August 16, 2013
* _________________________________ Donald H. Pratt	Chairman of the Board and Director	August 16, 2013
* _________________________________ M. Jeannine Strandjord	Director	August 16, 2013

* _________________________________ John R. Whitten	Director	August 16, 2013
* _________________________________ Stephen E. Yates	Director	August 16, 2013

*By:

/s/ Daniel K. Richardson

Daniel K. Richardson

Attorney in Fact

Pursuant to Power of Attorney, dated December 4, 2012 (filed electronically as Exhibit q1 to Post-Effective Amendment No. 57 to the Registration Statement of American Century Capital Portfolios, Inc. on February 28, 2013, File No.33-64872, and incorporated herein by reference).

Secretary’s Certificate, dated December 4, 2012 (filed electronically as Exhibit q2 to Post-Effective Amendment No. 57 to the Registration Statement of American Century Capital Portfolios, Inc. on February 28, 2013, File No. 33-64872, and incorporated herein by reference).

EXHIBIT INDEX

EXHIBIT NUMBER	DESCRIPTION OF DOCUMENT
Exhibit – 101.INS	XBRL Instance Document
Exhibit – 101.SCH	XBRL Taxonomy Extension Schema Document
Exhibit – 101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
Exhibit – 101.LAB	XBRL Taxonomy Extension Label Linkbase Document
Exhibit – 101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

XML

Label

Element

Value

Prospectus [Line Items]

rr_ProspectusLineItems

Document Type

dei_DocumentType

485BPOS

Document Period End Date

dei_DocumentPeriodEndDate

Nov. 30, 2012

Registrant Name

dei_EntityRegistrantName

AMERICAN CENTURY WORLD MUTUAL FUNDS INC

Central Index Key

dei_EntityCentralIndexKey

0000872825

Amendment Flag

dei_AmendmentFlag

false

Trading Symbol

dei_TradingSymbol

ACWMF

Document Creation Date

dei_DocumentCreationDate

Jul. 25, 2013

Document Effective Date

dei_DocumentEffectiveDate

Jul. 26, 2013

Prospectus Date

rr_ProspectusDate

Jul. 26, 2013

EMERGING MARKETS FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

RISK/RETURN

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital growth.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in American Century Investments funds. More information about these and other discounts, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

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

Portfolio Turnover [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 85% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

85.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in American Century Investments funds. More information about these and other discounts, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds.

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

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, that you earn 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

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The fund will invest at least 80% of its assets in equity securities of companies located in emerging market countries. The portfolio managers look for stocks of companies they believe will increase in value over time, using an investment strategy developed by American Century Investments. In implementing this strategy, the portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. The portfolio managers use a variety of analytical research tools and techniques to identify the stocks of companies that meet their investment criteria. Under normal market conditions, the fund's portfolio will primarily consist of securities of companies whose earnings or revenues are not only growing, but growing at an accelerating pace.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

•	Foreign Risk - The fund invests in foreign securities, which are generally riskier than U.S. securities. As a result, the fund is subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.
•	Small-Cap Stock Risk - Investing in securities of smaller foreign companies generally presents unique risks in addition to the typical risks of investing in foreign securities. Smaller companies may have limited financial resources, product lines, markets and have less publicly available information. In addition, securities of smaller companies may trade less frequently and in more limited volumes than securities of larger companies, which could lead to higher transaction costs. Smaller companies also may be more sensitive to changing economic conditions. These factors may cause investments in smaller foreign companies to experience more price volatility.
•	Currency Risk - Because the fund generally invests in securities denominated in foreign currencies, the fund is subject to currency risk, meaning that the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.
•	Emerging Market Risk - Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries' emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.
	The fund considers a security to be an emerging markets security if its issuer is located outside the following list of developed countries: Australia, Austria, Belgium, Bermuda, Canada, Denmark, Finland, France, Germany, Greece, Hong Kong, Ireland, Israel, Italy, Japan, Luxembourg, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, the United Kingdom and the United States.
•	Growth Stocks - Investments in growth stocks may involve special risks and their prices may fluctuate more dramatically than the overall stock market.
•	Style Risk - If at any time the market is not favoring the fund's growth investment style, the fund's gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.
•	Market Risk - The value of the fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market.
•	Price Volatility - The value of the fund's shares may fluctuate significantly in the short term.
•	Principal Loss - At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

Principal Loss - At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Fund Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.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 how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter  (2Q 2009): 31.24%

Lowest Performance Quarter (3Q 2008): -33.40%

As of June 30, 2013, the most recent calendar quarter end, the year-to-date return for the Investor Class was -7.75%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(7.75%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

31.24%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(33.40%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2012

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

Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. 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 are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

EMERGING MARKETS FUND | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

25

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

1.74%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.75%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[1]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

1.50%

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

March 31, 2015

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

153

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

511

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

910

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,025

Annual Return 2003

rr_AnnualReturn2003

65.62%

Annual Return 2004

rr_AnnualReturn2004

13.53%

Annual Return 2005

rr_AnnualReturn2005

35.98%

Annual Return 2006

rr_AnnualReturn2006

42.59%

Annual Return 2007

rr_AnnualReturn2007

43.73%

Annual Return 2008

rr_AnnualReturn2008

(59.79%)

Annual Return 2009

rr_AnnualReturn2009

69.36%

Annual Return 2010

rr_AnnualReturn2010

17.85%

Annual Return 2011

rr_AnnualReturn2011

(21.60%)

Annual Return 2012

rr_AnnualReturn2012

24.86%

1 Year

rr_AverageAnnualReturnYear01

24.86%

5 Years

rr_AverageAnnualReturnYear05

(4.71%)

10 Years

rr_AverageAnnualReturnYear10

15.19%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 1997

EMERGING MARKETS FUND | A CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

none

Management Fee

rr_ManagementFeesOverAssets

1.74%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.00%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[1]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

1.75%

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

March 31, 2015

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

743

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,129

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,555

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,733

1 Year

rr_AverageAnnualReturnYear01

17.38%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(6.03%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

14.23%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 1999

^[2]

EMERGING MARKETS FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

1.54%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.55%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[1]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

1.30%

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

March 31, 2015

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

133

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

449

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

805

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,808

1 Year

rr_AverageAnnualReturnYear01

25.19%

5 Years

rr_AverageAnnualReturnYear05

(4.50%)

10 Years

rr_AverageAnnualReturnYear10

15.40%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jan. 28, 1999

EMERGING MARKETS FUND | C CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

none

Management Fee

rr_ManagementFeesOverAssets

1.74%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.75%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[1]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

2.50%

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

March 31, 2015

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

254

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

815

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,418

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

3,043

1 Year

rr_AverageAnnualReturnYear01

23.62%

5 Years

rr_AverageAnnualReturnYear05

(5.65%)

10 Years

rr_AverageAnnualReturnYear10

14.05%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 18, 2001

EMERGING MARKETS FUND | R CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

1.74%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.25%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[1]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

2.00%

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

March 31, 2015

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

203

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

664

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,167

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,548

1 Year

rr_AverageAnnualReturnYear01

24.28%

5 Years

rr_AverageAnnualReturnYear05

(5.17%)

Since Inception

rr_AverageAnnualReturnSinceInception

(4.05%)

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

EMERGING MARKETS FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

1.39%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.40%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[1]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

1.15%

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

March 31, 2015

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

117

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

402

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

726

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,642

EMERGING MARKETS FUND | MSCI Emerging Markets Growth Index (reflects no deduction for fees, expenses or taxes, other than foreign withholding tax)

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

20.56%

5 Years

rr_AverageAnnualReturnYear05

(1.95%)

10 Years

rr_AverageAnnualReturnYear10

14.84%

EMERGING MARKETS FUND | Return After Taxes on Distributions | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

24.86%

5 Years

rr_AverageAnnualReturnYear05

(4.77%)

10 Years

rr_AverageAnnualReturnYear10

13.92%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 1997

EMERGING MARKETS FUND | Return After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

16.16%

5 Years

rr_AverageAnnualReturnYear05

(3.92%)

10 Years

rr_AverageAnnualReturnYear10

13.19%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 1997

GLOBAL GROWTH FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

RISK/RETURN

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital growth.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in American Century Investments funds. More information about these and other discounts, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

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

Portfolio Turnover [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 54% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

54.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in American Century Investments funds. More information about these and other discounts, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds.

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

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, that you earn 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

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The fund invests primarily in companies located in developed countries world-wide (including the United States). The portfolio managers look for stocks of companies they believe will increase in value over time, using an investment strategy developed by American Century Investments. In implementing this strategy, the portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on broad economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. The portfolio managers use a variety of analytical research tools and techniques to identify the stocks of companies that meet their investment criteria. Under normal market conditions, the fund's portfolio will primarily consist of securities of companies whose earnings or revenues are not only growing, but growing at an accelerating pace.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Foreign Risk – The fund invests in foreign securities, which are generally riskier than U.S. securities. As a result, the fund is subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• Currency Risk – Because the fund invests in securities denominated in foreign currencies, the fund is subject to currency risk, meaning that the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.

• Emerging Market Risk – Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries' emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.

• Growth Stocks – Investments in growth stocks may involve special risks and their prices may fluctuate more dramatically than the overall stock market.

• Style Risk - If at any time the market is not favoring the fund's growth investment style, the fund's gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.

• Market Risk – The value of the fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market.

• Price Volatility – The value of the fund's shares may fluctuate significantly in the short term.

• Principal Loss – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

Principal Loss - At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Fund Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.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 how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (2Q 2003): 16.46%

Lowest Performance Quarter (4Q 2008): -23.44% 

As of June 30, 2013, the most recent calendar quarter end, the year-to-date return for the Investor Class was 8.40%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

8.40%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

16.46%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(23.44%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2012

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

Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. 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 are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

GLOBAL GROWTH FUND | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

25

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

1.10%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.10%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

112

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

350

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

607

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,340

Annual Return 2003

rr_AnnualReturn2003

34.52%

Annual Return 2004

rr_AnnualReturn2004

15.11%

Annual Return 2005

rr_AnnualReturn2005

18.11%

Annual Return 2006

rr_AnnualReturn2006

18.16%

Annual Return 2007

rr_AnnualReturn2007

20.11%

Annual Return 2008

rr_AnnualReturn2008

(42.71%)

Annual Return 2009

rr_AnnualReturn2009

32.66%

Annual Return 2010

rr_AnnualReturn2010

12.98%

Annual Return 2011

rr_AnnualReturn2011

(6.24%)

Annual Return 2012

rr_AnnualReturn2012

17.50%

1 Year

rr_AverageAnnualReturnYear01

17.50%

5 Years

rr_AverageAnnualReturnYear05

(1.10%)

10 Years

rr_AverageAnnualReturnYear10

9.39%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 1998

GLOBAL GROWTH FUND | A CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

none

Management Fee

rr_ManagementFeesOverAssets

1.10%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.35%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

705

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

979

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,273

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,105

1 Year

rr_AverageAnnualReturnYear01

10.37%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(2.53%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

8.47%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Feb. 05, 1999

^[2]

GLOBAL GROWTH FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

0.90%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.90%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

92

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

287

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

499

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,108

1 Year

rr_AverageAnnualReturnYear01

17.67%

5 Years

rr_AverageAnnualReturnYear05

(0.92%)

10 Years

rr_AverageAnnualReturnYear10

9.62%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 01, 2000

GLOBAL GROWTH FUND | C CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

none

Management Fee

rr_ManagementFeesOverAssets

1.10%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.10%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

214

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

659

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,130

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,428

1 Year

rr_AverageAnnualReturnYear01

16.23%

5 Years

rr_AverageAnnualReturnYear05

(2.11%)

10 Years

rr_AverageAnnualReturnYear10

8.33%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2002

GLOBAL GROWTH FUND | R CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

1.10%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.60%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

163

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

506

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

872

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,899

1 Year

rr_AverageAnnualReturnYear01

16.79%

5 Years

rr_AverageAnnualReturnYear05

(1.62%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.83%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 29, 2005

GLOBAL GROWTH FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.75%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

77

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

240

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

417

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

931

GLOBAL GROWTH FUND | Return After Taxes on Distributions | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

17.45%

5 Years

rr_AverageAnnualReturnYear05

(1.18%)

10 Years

rr_AverageAnnualReturnYear10

8.93%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 1998

GLOBAL GROWTH FUND | Return After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

11.44%

5 Years

rr_AverageAnnualReturnYear05

(0.94%)

10 Years

rr_AverageAnnualReturnYear10

8.27%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 1998

GLOBAL GROWTH FUND | MSCI World Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

15.83%

5 Years

rr_AverageAnnualReturnYear05

(1.18%)

10 Years

rr_AverageAnnualReturnYear10

7.51%

INTERNATIONAL GROWTH FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

RISK/RETURN

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital growth.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in American Century Investments funds. More information about these and other discounts, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

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

Portfolio Turnover [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 106% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

106.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in American Century Investments funds. More information about these and other discounts, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds.

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

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, that you earn 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

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The fund invests primarily in securities of companies located in at least three developed countries world-wide (excluding the United States). The portfolio managers look for stocks of companies they believe will increase in value over time, using an investment strategy developed by American Century Investments. In implementing this strategy, the portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on broad economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. The portfolio managers use a variety of analytical research tools and techniques to identify the stocks of companies that meet their investment criteria. Under normal market conditions, the fund's portfolio will primarily consist of securities of companies whose earnings or revenues are not only growing, but growing at an accelerating pace.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Foreign Risk – The fund invests primarily in foreign securities, which are generally riskier than U.S. securities. As a result the fund is subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• Currency Risk – Because the fund generally invests in securities denominated in foreign currencies, the fund is subject to currency risk, meaning that the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.

• Emerging Market Risk – Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries' emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.

• Growth Stocks – Investments in growth stocks may involve special risks and their prices may fluctuate more dramatically than the overall stock market.

• Style Risk – If at any time the market is not favoring the fund's growth investment style, the fund's gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.

• Market Risk – The value of the fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market.

• Price Volatility – The value of the fund's shares may fluctuate significantly in the short term.

• Principal Loss – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

Principal Loss - At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Fund Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.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 how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (2Q 2009): 22.71%  

Lowest Performance Quarter (3Q 2008): -23.28%

As of June 30, 2013, the most recent calendar quarter end, the year-to-date return for the Investor Class was 4.43%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

4.43%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

22.71%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(23.28%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2012

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

Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. 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 are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

INTERNATIONAL GROWTH FUND | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

25

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

1.28%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.29%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

132

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

410

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

708

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,556

Annual Return 2003

rr_AnnualReturn2003

25.38%

Annual Return 2004

rr_AnnualReturn2004

15.31%

Annual Return 2005

rr_AnnualReturn2005

13.34%

Annual Return 2006

rr_AnnualReturn2006

25.00%

Annual Return 2007

rr_AnnualReturn2007

17.26%

Annual Return 2008

rr_AnnualReturn2008

(45.21%)

Annual Return 2009

rr_AnnualReturn2009

34.02%

Annual Return 2010

rr_AnnualReturn2010

13.70%

Annual Return 2011

rr_AnnualReturn2011

(11.84%)

Annual Return 2012

rr_AnnualReturn2012

21.87%

1 Year

rr_AverageAnnualReturnYear01

21.87%

5 Years

rr_AverageAnnualReturnYear05

(2.15%)

10 Years

rr_AverageAnnualReturnYear10

7.97%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 09, 1991

INTERNATIONAL GROWTH FUND | A CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

none

Management Fee

rr_ManagementFeesOverAssets

1.28%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.54%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

723

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,034

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,367

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,303

1 Year

rr_AverageAnnualReturnYear01

14.59%

^[3]

5 Years

rr_AverageAnnualReturnYear05

(3.53%)

^[3]

10 Years

rr_AverageAnnualReturnYear10

7.07%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 02, 1996

^[3]

INTERNATIONAL GROWTH FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

1.08%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.09%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

111

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

347

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

602

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,329

1 Year

rr_AverageAnnualReturnYear01

22.15%

5 Years

rr_AverageAnnualReturnYear05

(1.94%)

10 Years

rr_AverageAnnualReturnYear10

8.18%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 20, 1997

INTERNATIONAL GROWTH FUND | C CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

none

Management Fee

rr_ManagementFeesOverAssets

1.28%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.29%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

233

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

716

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,226

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,621

1 Year

rr_AverageAnnualReturnYear01

20.70%

5 Years

rr_AverageAnnualReturnYear05

(3.12%)

10 Years

rr_AverageAnnualReturnYear10

6.90%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 04, 2001

INTERNATIONAL GROWTH FUND | R CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

1.28%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.79%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

182

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

564

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

970

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,103

1 Year

rr_AverageAnnualReturnYear01

21.24%

5 Years

rr_AverageAnnualReturnYear05

(2.64%)

Since Inception

rr_AverageAnnualReturnSinceInception

6.92%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 29, 2003

INTERNATIONAL GROWTH FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

0.93%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.94%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

96

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

300

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

521

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,155

INTERNATIONAL GROWTH FUND | Return After Taxes on Distributions | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

21.80%

5 Years

rr_AverageAnnualReturnYear05

(2.18%)

10 Years

rr_AverageAnnualReturnYear10

7.85%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 09, 1991

INTERNATIONAL GROWTH FUND | Return After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

14.86%

5 Years

rr_AverageAnnualReturnYear05

(1.66%)

10 Years

rr_AverageAnnualReturnYear10

7.21%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 09, 1991

INTERNATIONAL GROWTH FUND | MSCI EAFE (Europe, Australasia, Far East) Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

17.32%

5 Years

rr_AverageAnnualReturnYear05

(3.69%)

10 Years

rr_AverageAnnualReturnYear10

8.21%

INTERNATIONAL GROWTH FUND | MSCI EAFE Growth Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

16.86%

5 Years

rr_AverageAnnualReturnYear05

(3.09%)

10 Years

rr_AverageAnnualReturnYear10

7.77%

INTERNATIONAL VALUE FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

RISK/RETURN

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks long-term capital growth.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in American Century Investments funds. More information about these and other discounts, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

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

Portfolio Turnover [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 125% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

125.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in American Century Investments funds. More information about these and other discounts, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds.

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

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, that you earn 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

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

In selecting stocks for the fund, the portfolio managers will normally invest at least 80% of the value of the fund's net assets (plus any borrowings for investment purposes) in equity securities and at least 65% of net assets in securities of issuers from a minimum of three countries outside the United States that have characteristics similar to those of the companies that comprise the MSCI EAFE® Value Index.

The MSCI EAFEValue Index is a market capitalization-weighted index that monitors the performance of value stocks from Europe, Australasia, and the Far East.

The managers use quantitative models in a two-step process to construct the portfolio of stocks for the fund. First, the managers rank stocks from most attractive to least attractive based on each stock's score from a proprietary expected returns model. In the second step, the expected returns model is imported into an optimization process that balances active return and risk versus the MSCI EAFE Value Index. This index is based on rules that identify companies that are undervalued by the market. Generally, companies may be undervalued due to market declines, poor economic conditions, actual or anticipated bad news regarding the issuer or its industry, or because it has been overlooked by the market.

The portfolio managers also intend to spread the fund's holdings across different countries and geographic regions in an effort to manage the risks of an international portfolio.

The portfolio managers generally sell a stock when they believe it has become less attractive relative to other opportunities, its risk characteristics outweigh its return opportunity or specific events alter its prospects.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Foreign Risk – The fund invests primarily in foreign securities, which are generally riskier than U.S. securities. As a result the fund is subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• Currency Risk – Because the fund generally invests in securities denominated in foreign currencies, the fund is subject to currency risk, meaning that the fund could experience gains or losses solely on changes in the exchange rate between foreign currencies and the U.S. dollar.

• Benchmark Correlation – The fund's performance will be tied to the performance of its benchmark, the MSCI EAFE Value Index. If the fund's benchmark goes down, it is likely that the fund's performance will go down.

• Market Risk – The value of the fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market.

• Price Volatility – The value of the fund's shares may fluctuate significantly in the short term.

• Style Risk – If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may not rise as high as other funds and may in fact decline, even if stock prices generally are increasing.

• Quantitative Risk – Stocks selected by the portfolio managers using quantitative models may perform differently than expected due to the portfolio managers' judgments regarding the factors used in the models, the weight placed on each factor, changes from the factors' historical trends, and technical issues with the construction and implementation of the models (including, for example, data problems and/or software or other implementation issues). There is no guarantee that the use of the quantitative model will result in effective investment decisions for the fund. Additionally, the commonality of portfolio holdings across quantitative investment managers may amplify losses.

• Principal Loss – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

Principal Loss - At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Fund Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for A Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for A Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.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 how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (2Q 2009): 24.34%

Lowest Performance Quarter (4Q 2008): -21.50% 

As of June 30, 2013, the most recent calendar quarter end, the year-to-date return for the A Class was 3.07%.

Year to Date Return, Label

rr_YearToDateReturnLabel

A Class year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

3.07%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

24.34%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.50%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2012

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

Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

The after-tax returns are shown only for A Class shares. After-tax returns for other share classes will vary.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The after-tax returns are shown only for A Class shares. After-tax returns for other share classes will vary. 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 are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

INTERNATIONAL VALUE FUND | A CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

none

Management Fee

rr_ManagementFeesOverAssets

1.30%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

725

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,040

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,377

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,323

Annual Return 2003

rr_AnnualReturn2003

36.57%

Annual Return 2004

rr_AnnualReturn2004

18.29%

Annual Return 2005

rr_AnnualReturn2005

11.04%

Annual Return 2006

rr_AnnualReturn2006

28.19%

Annual Return 2007

rr_AnnualReturn2007

17.01%

Annual Return 2008

rr_AnnualReturn2008

(43.48%)

Annual Return 2009

rr_AnnualReturn2009

29.71%

Annual Return 2010

rr_AnnualReturn2010

3.49%

Annual Return 2011

rr_AnnualReturn2011

(9.20%)

Annual Return 2012

rr_AnnualReturn2012

18.16%

1 Year

rr_AverageAnnualReturnYear01

11.29%

5 Years

rr_AverageAnnualReturnYear05

(5.15%)

10 Years

rr_AverageAnnualReturnYear10

7.51%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 31, 1997

INTERNATIONAL VALUE FUND | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

25

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

1.30%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.31%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

134

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

416

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

719

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,578

1 Year

rr_AverageAnnualReturnYear01

18.37%

5 Years

rr_AverageAnnualReturnYear05

(3.78%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.76%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 03, 2006

INTERNATIONAL VALUE FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

1.10%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.11%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

113

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

353

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

612

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,351

1 Year

rr_AverageAnnualReturnYear01

18.81%

5 Years

rr_AverageAnnualReturnYear05

(3.58%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.96%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 03, 2006

INTERNATIONAL VALUE FUND | C CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

none

Management Fee

rr_ManagementFeesOverAssets

1.30%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.31%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

235

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

723

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,236

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,641

1 Year

rr_AverageAnnualReturnYear01

17.32%

5 Years

rr_AverageAnnualReturnYear05

(4.74%)

Since Inception

rr_AverageAnnualReturnSinceInception

0.75%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 03, 2006

INTERNATIONAL VALUE FUND | R CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

1.30%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.81%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

184

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

570

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

981

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,124

1 Year

rr_AverageAnnualReturnYear01

17.94%

5 Years

rr_AverageAnnualReturnYear05

(4.26%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.25%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 03, 2006

INTERNATIONAL VALUE FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)

rr_MaximumAccountFee

none

Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)

rr_ExchangeFeeOverRedemption

2.00%

Management Fee

rr_ManagementFeesOverAssets

0.95%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.96%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

98

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

306

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

532

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,178

INTERNATIONAL VALUE FUND | Return After Taxes on Distributions | A CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

11.32%

5 Years

rr_AverageAnnualReturnYear05

(5.19%)

10 Years

rr_AverageAnnualReturnYear10

6.77%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 31, 1997

INTERNATIONAL VALUE FUND | Return After Taxes on Distributions and Sale of Fund Shares | A CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

7.93%

5 Years

rr_AverageAnnualReturnYear05

(4.08%)

10 Years

rr_AverageAnnualReturnYear10

6.87%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 31, 1997

INTERNATIONAL VALUE FUND | MSCI EAFE Value Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

17.69%

5 Years

rr_AverageAnnualReturnYear05

(4.34%)

10 Years

rr_AverageAnnualReturnYear10

8.57%

^[4]

NT EMERGING MARKETS FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

RISK/RETURN

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital growth.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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

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 101% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

101.00%

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds.

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

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, that you earn 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

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The fund will invest at least 80% of its assets in equity securities of companies located in emerging market countries. The portfolio managers look for stocks of companies they believe will increase in value over time, using an investment strategy developed by American Century Investments. In implementing this strategy, the portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. The portfolio managers use a variety of analytical research tools and techniques to identify the stocks of companies that meet their investment criteria. Under normal market conditions, the fund's portfolios will primarily consist of securities of companies whose earnings or revenues are not only growing, but growing at an accelerating pace.

The fund is not permitted to invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

•	Foreign Risk – The fund invests in foreign securities, which are generally riskier than U.S. securities. As a result, the fund is subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.
•	Small-Cap Stock Risk – Investing in securities of smaller foreign companies generally presents unique risks in addition to the typical risks of investing in foreign securities. Smaller companies may have limited financial resources, product lines, markets and have less publicly available information. In addition, securities of smaller companies may trade less frequently and in more limited volumes than securities of larger companies, which could lead to higher transaction costs. Smaller companies also may be more sensitive to changing economic conditions. These factors may cause investments in smaller foreign companies to experience more price volatility.
•	Currency Risk – Because the fund generally invests in securities denominated in foreign currencies, the fund is subject to currency risk, meaning that the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.
•	Emerging Market Risk – Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries.
	The fund considers a security to be an emerging markets security if its issuer is located outside the following list of developed countries: Australia, Austria, Belgium, Bermuda, Canada, Denmark, Finland, France, Germany, Greece, Hong Kong, Ireland, Israel, Italy, Japan, Luxembourg, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, the United Kingdom and the United States.
	Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries’ emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.
•	Growth Stocks – Investments in growth stocks may involve special risks and their prices may fluctuate more dramatically than the overall stock market.
•	Tobacco Exclusion – The fund's prohibition on tobacco-related investments may cause it to forego profitable investment opportunities.
•	Style Risk – If at any time the market is not favoring the fund's growth investment style, the fund's gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.
•	Market Risk – The value of a fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market.
•	Price Volatility – The value of a fund's shares may fluctuate significantly in the short term.
•	Principal Loss – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

Principal Loss - At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Fund Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Institutional Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Institutional Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.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 how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (2Q 2009): 31.74%

Lowest Performance Quarter (3Q 2008): -32.19%

As of June 30, 2013, the most recent calendar quarter end, the year-to-date return for the Institutional Class was -7.98%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Institutional Class year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(7.98%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

31.74%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(32.19%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2012

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

Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary. The 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 are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

NT EMERGING MARKETS FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fee

rr_ManagementFeesOverAssets

1.54%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.55%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[1]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

1.30%

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

March 31, 2015

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

133

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

449

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

805

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,808

Annual Return 2007

rr_AnnualReturn2007

43.68%

Annual Return 2008

rr_AnnualReturn2008

(59.09%)

Annual Return 2009

rr_AnnualReturn2009

67.64%

Annual Return 2010

rr_AnnualReturn2010

17.33%

Annual Return 2011

rr_AnnualReturn2011

(21.47%)

Annual Return 2012

rr_AnnualReturn2012

24.40%

1 Year

rr_AverageAnnualReturnYear01

24.40%

5 Years

rr_AverageAnnualReturnYear05

(4.69%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.03%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT EMERGING MARKETS FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fee

rr_ManagementFeesOverAssets

1.39%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.40%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[1]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

1.15%

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

March 31, 2015

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

117

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

402

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

726

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,642

NT EMERGING MARKETS FUND | MSCI Emerging Markets Growth Index (reflects no deduction for fees, expenses or taxes, other than foreign withholding tax)

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

20.56%

5 Years

rr_AverageAnnualReturnYear05

(1.95%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.92%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 30, 2006

NT EMERGING MARKETS FUND | Return After Taxes on Distributions | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

24.62%

5 Years

rr_AverageAnnualReturnYear05

(4.83%)

Since Inception

rr_AverageAnnualReturnSinceInception

3.38%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT EMERGING MARKETS FUND | Return After Taxes on Distributions and Sale of Fund Shares | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

16.10%

5 Years

rr_AverageAnnualReturnYear05

(3.95%)

Since Inception

rr_AverageAnnualReturnSinceInception

3.34%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT INTERNATIONAL GROWTH FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

RISK/RETURN

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks capital growth.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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

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 93% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

93.00%

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds.

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

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, that you earn 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

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The fund invests primarily in securities of companies located in at least three developed countries world-wide (excluding the United States). The portfolio managers look for stocks of companies they believe will increase in value over time, using an investment strategy developed by American Century Investments. In implementing this strategy, the portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on broad economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. The portfolio managers use a variety of analytical research tools and techniques to identify the stocks of companies that meet their investment criteria. Under normal market conditions, the fund's portfolio will primarily consist of securities of companies whose earnings or revenues are not only growing, but growing at an accelerating pace.

The fund is not permitted to invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Foreign Risk – The fund invests primarily in foreign securities, which are generally riskier than U.S. securities. As a result the fund is subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• Currency Risk – Because the fund generally invests in securities denominated in foreign currencies, the fund is subject to currency risk, meaning that the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.

• Emerging Market Risk – Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries' emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.

• Growth Stocks – Investments in growth stocks may involve special risks and their prices may fluctuate more dramatically than the overall stock market.

• Style Risk – If at any time the market is not favoring the fund's growth investment style, the fund's gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.

• Tobacco Exclusion – The fund's prohibition on tobacco-related investments may cause it to forego profitable investment opportunities.

• Market Risk – The value of the fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market.

• Price Volatility – The value of the fund's shares may fluctuate significantly in the short term.

• Principal Loss – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

Principal Loss - At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Fund Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Institutional Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Institutional Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.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 how the fund will perform in the future.

Bar Chart [Heading]

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Calendar Year Total Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (2Q 2009): 22.72%

Lowest Performance Quarter (3Q 2008): -23.04%

As of June 30, 2013, the most recent calendar quarter end, the year-to-date return for the Institutional Class was 4.27%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Institutional Class year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

4.27%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

22.72%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(23.04%)

Performance Table Heading

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Average Annual Total Returns For the calendar year ended December 31, 2012

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

The 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

Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary. The 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 are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

NT INTERNATIONAL GROWTH FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fee

rr_ManagementFeesOverAssets

1.08%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.09%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

111

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

347

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

602

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,329

Annual Return 2007

rr_AnnualReturn2007

17.11%

Annual Return 2008

rr_AnnualReturn2008

(45.22%)

Annual Return 2009

rr_AnnualReturn2009

34.26%

Annual Return 2010

rr_AnnualReturn2010

13.79%

Annual Return 2011

rr_AnnualReturn2011

(12.80%)

Annual Return 2012

rr_AnnualReturn2012

22.35%

1 Year

rr_AverageAnnualReturnYear01

22.35%

5 Years

rr_AverageAnnualReturnYear05

(2.24%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.74%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT INTERNATIONAL GROWTH FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fee

rr_ManagementFeesOverAssets

0.93%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.94%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

96

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

300

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

521

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,155

NT INTERNATIONAL GROWTH FUND | Return After Taxes on Distributions | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

22.31%

5 Years

rr_AverageAnnualReturnYear05

(2.32%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.60%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT INTERNATIONAL GROWTH FUND | Return After Taxes on Distributions and Sale of Fund Shares | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

15.11%

5 Years

rr_AverageAnnualReturnYear05

(1.82%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.56%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT INTERNATIONAL GROWTH FUND | MSCI EAFE (Europe, Australasia, Far East) Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

17.32%

5 Years

rr_AverageAnnualReturnYear05

(3.69%)

Since Inception

rr_AverageAnnualReturnSinceInception

0.23%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 30, 2006

NT INTERNATIONAL GROWTH FUND | MSCI EAFE Growth Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

16.86%

5 Years

rr_AverageAnnualReturnYear05

(3.09%)

Since Inception

rr_AverageAnnualReturnSinceInception

0.99%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 30, 2006

[1] The advisor has agreed to waive 0.25 percentage points of the fund's management fee. The advisor expects this waiver to continue until March 31, 2015 and cannot terminate it prior to such date without the approval of the Board of Directors.

[2] Prior to September 4, 2007, this class was referred to as the Advisor Class and did not have a front-end sales charge. Performance prior to that date has been restated to reflect this charge.

[3] Prior to December 3, 2007, this class was referred to as the Advisor Class and did not have a front-end sales charge. Performance prior to that date has been restated to reflect this charge.

[4] International Value acquired all the net assets of the Mason Street International Equity Fund on March 31, 2006, pursuant to a plan of reorganization approved by the acquired fund's shareholders on March 15, 2006. Performance information prior to April 1, 2006 is that of the Mason Street International Equity Fund.

XML

EMERGING MARKETS FUND

RISK/RETURN

Investment Objective

The fund seeks capital growth.

Fees and Expenses

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in American Century Investments funds. More information about these and other discounts, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees EMERGING MARKETS FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS	R6 CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)	none	none	none	1.00%	none	none
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none	none
Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)	2.00%	2.00%	none	none	2.00%	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 EMERGING MARKETS FUND		INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS	R6 CLASS
Management Fee		1.74%	1.54%	1.74%	1.74%	1.74%	1.39%
Distribution and Service (12b-1) Fees		none	none	0.25%	1.00%	0.50%	none
Other Expenses		0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses		1.75%	1.55%	2.00%	2.75%	2.25%	1.40%
Fee Waiver	[1]	0.25%	0.25%	0.25%	0.25%	0.25%	0.25%
Total Annual Fund Operating Expenses After Waiver		1.50%	1.30%	1.75%	2.50%	2.00%	1.15%

Example

The example below is intended to help you compare the costs of investing in the fund with the costs 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, that you earn 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 EMERGING MARKETS FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	153	511	910	2,025
INSTITUTIONAL CLASS	133	449	805	1,808
A CLASS	743	1,129	1,555	2,733
C CLASS	254	815	1,418	3,043
R CLASS	203	664	1,167	2,548
R6 CLASS	117	402	726	1,642

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 85% of the average value of its portfolio.

Principal Investment Strategies

The fund will invest at least 80% of its assets in equity securities of companies located in emerging market countries. The portfolio managers look for stocks of companies they believe will increase in value over time, using an investment strategy developed by American Century Investments. In implementing this strategy, the portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. The portfolio managers use a variety of analytical research tools and techniques to identify the stocks of companies that meet their investment criteria. Under normal market conditions, the fund's portfolio will primarily consist of securities of companies whose earnings or revenues are not only growing, but growing at an accelerating pace.

Principal Risks

•	Foreign Risk - The fund invests in foreign securities, which are generally riskier than U.S. securities. As a result, the fund is subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.
•	Small-Cap Stock Risk - Investing in securities of smaller foreign companies generally presents unique risks in addition to the typical risks of investing in foreign securities. Smaller companies may have limited financial resources, product lines, markets and have less publicly available information. In addition, securities of smaller companies may trade less frequently and in more limited volumes than securities of larger companies, which could lead to higher transaction costs. Smaller companies also may be more sensitive to changing economic conditions. These factors may cause investments in smaller foreign companies to experience more price volatility.
•	Currency Risk - Because the fund generally invests in securities denominated in foreign currencies, the fund is subject to currency risk, meaning that the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.
•	Emerging Market Risk - Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries' emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.
	The fund considers a security to be an emerging markets security if its issuer is located outside the following list of developed countries: Australia, Austria, Belgium, Bermuda, Canada, Denmark, Finland, France, Germany, Greece, Hong Kong, Ireland, Israel, Italy, Japan, Luxembourg, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, the United Kingdom and the United States.
•	Growth Stocks - Investments in growth stocks may involve special risks and their prices may fluctuate more dramatically than the overall stock market.
•	Style Risk - If at any time the market is not favoring the fund's growth investment style, the fund's gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.
•	Market Risk - The value of the fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market.
•	Price Volatility - The value of the fund's shares may fluctuate significantly in the short term.
•	Principal Loss - At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Fund Performance

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Calendar Year Total Returns

Highest Performance Quarter  (2Q 2009): 31.24%

Lowest Performance Quarter (3Q 2008): -33.40%

As of June 30, 2013, the most recent calendar quarter end, the year-to-date return for the Investor Class was -7.75%.

Average Annual Total Returns For the calendar year ended December 31, 2012

Average Annual Total Returns EMERGING MARKETS FUND		1 Year	5 Years	10 Years	Since Inception	Inception Date
INVESTOR CLASS		24.86%	(4.71%)	15.19%		Sep. 30, 1997
INVESTOR CLASS Return After Taxes on Distributions		24.86%	(4.77%)	13.92%		Sep. 30, 1997
INVESTOR CLASS Return After Taxes on Distributions and Sale of Fund Shares		16.16%	(3.92%)	13.19%		Sep. 30, 1997
INSTITUTIONAL CLASS		25.19%	(4.50%)	15.40%		Jan. 28, 1999
A CLASS	[1]	17.38%	(6.03%)	14.23%		May 12, 1999
C CLASS		23.62%	(5.65%)	14.05%		Dec. 18, 2001
R CLASS		24.28%	(5.17%)		(4.05%)	Sep. 28, 2007
MSCI Emerging Markets Growth Index (reflects no deduction for fees, expenses or taxes, other than foreign withholding tax)		20.56%	(1.95%)	14.84%

The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. 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 are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

GLOBAL GROWTH FUND

RISK/RETURN

Investment Objective

The fund seeks capital growth.

Fees and Expenses

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in American Century Investments funds. More information about these and other discounts, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees GLOBAL GROWTH FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS	R6 CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)	none	none	none	1.00%	none	none
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none	none
Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)	2.00%	2.00%	none	none	2.00%	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 GLOBAL GROWTH FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS	R6 CLASS
Management Fee	1.10%	0.90%	1.10%	1.10%	1.10%	0.75%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%	none
Other Expenses	none	none	none	none	none	none
Total Annual Fund Operating Expenses	1.10%	0.90%	1.35%	2.10%	1.60%	0.75%

Example

The example below is intended to help you compare the costs of investing in the fund with the costs 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, that you earn 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 GLOBAL GROWTH FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	112	350	607	1,340
INSTITUTIONAL CLASS	92	287	499	1,108
A CLASS	705	979	1,273	2,105
C CLASS	214	659	1,130	2,428
R CLASS	163	506	872	1,899
R6 CLASS	77	240	417	931

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 54% of the average value of its portfolio.

Principal Investment Strategies

The fund invests primarily in companies located in developed countries world-wide (including the United States). The portfolio managers look for stocks of companies they believe will increase in value over time, using an investment strategy developed by American Century Investments. In implementing this strategy, the portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on broad economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. The portfolio managers use a variety of analytical research tools and techniques to identify the stocks of companies that meet their investment criteria. Under normal market conditions, the fund's portfolio will primarily consist of securities of companies whose earnings or revenues are not only growing, but growing at an accelerating pace.

Principal Risks

• Foreign Risk – The fund invests in foreign securities, which are generally riskier than U.S. securities. As a result, the fund is subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• Currency Risk – Because the fund invests in securities denominated in foreign currencies, the fund is subject to currency risk, meaning that the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.

• Emerging Market Risk – Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries' emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.

• Growth Stocks – Investments in growth stocks may involve special risks and their prices may fluctuate more dramatically than the overall stock market.

• Style Risk - If at any time the market is not favoring the fund's growth investment style, the fund's gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.

• Market Risk – The value of the fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market.

• Price Volatility – The value of the fund's shares may fluctuate significantly in the short term.

• Principal Loss – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Fund Performance

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Calendar Year Total Returns

Highest Performance Quarter (2Q 2003): 16.46%

Lowest Performance Quarter (4Q 2008): -23.44% 

As of June 30, 2013, the most recent calendar quarter end, the year-to-date return for the Investor Class was 8.40%.

Average Annual Total Returns For the calendar year ended December 31, 2012

Average Annual Total Returns GLOBAL GROWTH FUND		1 Year	5 Years	10 Years	Since Inception	Inception Date
INVESTOR CLASS		17.50%	(1.10%)	9.39%		Dec. 01, 1998
INVESTOR CLASS Return After Taxes on Distributions		17.45%	(1.18%)	8.93%		Dec. 01, 1998
INVESTOR CLASS Return After Taxes on Distributions and Sale of Fund Shares		11.44%	(0.94%)	8.27%		Dec. 01, 1998
INSTITUTIONAL CLASS		17.67%	(0.92%)	9.62%		Aug. 01, 2000
A CLASS	[1]	10.37%	(2.53%)	8.47%		Feb. 05, 1999
C CLASS		16.23%	(2.11%)	8.33%		Mar. 01, 2002
R CLASS		16.79%	(1.62%)		4.83%	Jul. 29, 2005
MSCI World Index (reflects no deduction for fees, expenses or taxes)		15.83%	(1.18%)	7.51%

The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. 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 are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

INTERNATIONAL GROWTH FUND

RISK/RETURN

Investment Objective

The fund seeks capital growth.

Fees and Expenses

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in American Century Investments funds. More information about these and other discounts, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees INTERNATIONAL GROWTH FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS	R6 CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)	none	none	none	1.00%	none	none
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none	none
Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)	2.00%	2.00%	none	none	2.00%	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 INTERNATIONAL GROWTH FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS	R6 CLASS
Management Fee	1.28%	1.08%	1.28%	1.28%	1.28%	0.93%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%	none
Other Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	1.29%	1.09%	1.54%	2.29%	1.79%	0.94%

Example

The example below is intended to help you compare the costs of investing in the fund with the costs 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, that you earn 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 INTERNATIONAL GROWTH FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	132	410	708	1,556
INSTITUTIONAL CLASS	111	347	602	1,329
A CLASS	723	1,034	1,367	2,303
C CLASS	233	716	1,226	2,621
R CLASS	182	564	970	2,103
R6 CLASS	96	300	521	1,155

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 106% of the average value of its portfolio.

Principal Investment Strategies

The fund invests primarily in securities of companies located in at least three developed countries world-wide (excluding the United States). The portfolio managers look for stocks of companies they believe will increase in value over time, using an investment strategy developed by American Century Investments. In implementing this strategy, the portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on broad economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. The portfolio managers use a variety of analytical research tools and techniques to identify the stocks of companies that meet their investment criteria. Under normal market conditions, the fund's portfolio will primarily consist of securities of companies whose earnings or revenues are not only growing, but growing at an accelerating pace.

Principal Risks

• Foreign Risk – The fund invests primarily in foreign securities, which are generally riskier than U.S. securities. As a result the fund is subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• Currency Risk – Because the fund generally invests in securities denominated in foreign currencies, the fund is subject to currency risk, meaning that the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.

• Emerging Market Risk – Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries' emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.

• Growth Stocks – Investments in growth stocks may involve special risks and their prices may fluctuate more dramatically than the overall stock market.

• Style Risk – If at any time the market is not favoring the fund's growth investment style, the fund's gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.

• Market Risk – The value of the fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market.

• Price Volatility – The value of the fund's shares may fluctuate significantly in the short term.

• Principal Loss – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Fund Performance

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Calendar Year Total Returns

Highest Performance Quarter (2Q 2009): 22.71%  

Lowest Performance Quarter (3Q 2008): -23.28%

As of June 30, 2013, the most recent calendar quarter end, the year-to-date return for the Investor Class was 4.43%.

Average Annual Total Returns For the calendar year ended December 31, 2012

Average Annual Total Returns INTERNATIONAL GROWTH FUND		1 Year	5 Years	10 Years	Since Inception	Inception Date
INVESTOR CLASS		21.87%	(2.15%)	7.97%		May 09, 1991
INVESTOR CLASS Return After Taxes on Distributions		21.80%	(2.18%)	7.85%		May 09, 1991
INVESTOR CLASS Return After Taxes on Distributions and Sale of Fund Shares		14.86%	(1.66%)	7.21%		May 09, 1991
INSTITUTIONAL CLASS		22.15%	(1.94%)	8.18%		Nov. 20, 1997
A CLASS	[1]	14.59%	(3.53%)	7.07%		Oct. 02, 1996
C CLASS		20.70%	(3.12%)	6.90%		Jun. 04, 2001
R CLASS		21.24%	(2.64%)		6.92%	Aug. 29, 2003
MSCI EAFE (Europe, Australasia, Far East) Index (reflects no deduction for fees, expenses or taxes)		17.32%	(3.69%)	8.21%
MSCI EAFE Growth Index (reflects no deduction for fees, expenses or taxes)		16.86%	(3.09%)	7.77%

The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. 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 are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

INTERNATIONAL VALUE FUND

RISK/RETURN

Investment Objective

The fund seeks long-term capital growth.

Fees and Expenses

The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in American Century Investments funds. More information about these and other discounts, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees INTERNATIONAL VALUE FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS	R6 CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)	none	none	none	1.00%	none	none
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none	none
Redemption/Exchange Fee (as a percentage of amount redeemed/exchanged for shares held less than 60 days)	2.00%	2.00%	none	none	2.00%	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 INTERNATIONAL VALUE FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS	R6 CLASS
Management Fee	1.30%	1.10%	1.30%	1.30%	1.30%	0.95%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%	none
Other Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	1.31%	1.11%	1.56%	2.31%	1.81%	0.96%

Example

The example below is intended to help you compare the costs of investing in the fund with the costs 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, that you earn 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 INTERNATIONAL VALUE FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	134	416	719	1,578
INSTITUTIONAL CLASS	113	353	612	1,351
A CLASS	725	1,040	1,377	2,323
C CLASS	235	723	1,236	2,641
R CLASS	184	570	981	2,124
R6 CLASS	98	306	532	1,178

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 125% of the average value of its portfolio.

Principal Investment Strategies

In selecting stocks for the fund, the portfolio managers will normally invest at least 80% of the value of the fund's net assets (plus any borrowings for investment purposes) in equity securities and at least 65% of net assets in securities of issuers from a minimum of three countries outside the United States that have characteristics similar to those of the companies that comprise the MSCI EAFE® Value Index.

The MSCI EAFEValue Index is a market capitalization-weighted index that monitors the performance of value stocks from Europe, Australasia, and the Far East.

The managers use quantitative models in a two-step process to construct the portfolio of stocks for the fund. First, the managers rank stocks from most attractive to least attractive based on each stock's score from a proprietary expected returns model. In the second step, the expected returns model is imported into an optimization process that balances active return and risk versus the MSCI EAFE Value Index. This index is based on rules that identify companies that are undervalued by the market. Generally, companies may be undervalued due to market declines, poor economic conditions, actual or anticipated bad news regarding the issuer or its industry, or because it has been overlooked by the market.

The portfolio managers also intend to spread the fund's holdings across different countries and geographic regions in an effort to manage the risks of an international portfolio.

The portfolio managers generally sell a stock when they believe it has become less attractive relative to other opportunities, its risk characteristics outweigh its return opportunity or specific events alter its prospects.

Principal Risks

• Foreign Risk – The fund invests primarily in foreign securities, which are generally riskier than U.S. securities. As a result the fund is subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• Currency Risk – Because the fund generally invests in securities denominated in foreign currencies, the fund is subject to currency risk, meaning that the fund could experience gains or losses solely on changes in the exchange rate between foreign currencies and the U.S. dollar.

• Benchmark Correlation – The fund's performance will be tied to the performance of its benchmark, the MSCI EAFE Value Index. If the fund's benchmark goes down, it is likely that the fund's performance will go down.

• Market Risk – The value of the fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market.

• Price Volatility – The value of the fund's shares may fluctuate significantly in the short term.

• Style Risk – If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may not rise as high as other funds and may in fact decline, even if stock prices generally are increasing.

• Quantitative Risk – Stocks selected by the portfolio managers using quantitative models may perform differently than expected due to the portfolio managers' judgments regarding the factors used in the models, the weight placed on each factor, changes from the factors' historical trends, and technical issues with the construction and implementation of the models (including, for example, data problems and/or software or other implementation issues). There is no guarantee that the use of the quantitative model will result in effective investment decisions for the fund. Additionally, the commonality of portfolio holdings across quantitative investment managers may amplify losses.

• Principal Loss – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Fund Performance

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for A Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown.

Calendar Year Total Returns

Highest Performance Quarter (2Q 2009): 24.34%

Lowest Performance Quarter (4Q 2008): -21.50% 

As of June 30, 2013, the most recent calendar quarter end, the year-to-date return for the A Class was 3.07%.

Average Annual Total Returns For the calendar year ended December 31, 2012

Average Annual Total Returns INTERNATIONAL VALUE FUND	1 Year	5 Years	10 Years		Since Inception	Inception Date
A CLASS	11.29%	(5.15%)	7.51%	[1]		Mar. 31, 1997
A CLASS Return After Taxes on Distributions	11.32%	(5.19%)	6.77%	[1]		Mar. 31, 1997
A CLASS Return After Taxes on Distributions and Sale of Fund Shares	7.93%	(4.08%)	6.87%	[1]		Mar. 31, 1997
INVESTOR CLASS	18.37%	(3.78%)			1.76%	Apr. 03, 2006
INSTITUTIONAL CLASS	18.81%	(3.58%)			1.96%	Apr. 03, 2006
C CLASS	17.32%	(4.74%)			0.75%	Apr. 03, 2006
R CLASS	17.94%	(4.26%)			1.25%	Apr. 03, 2006
MSCI EAFE Value Index (reflects no deduction for fees, expenses or taxes)	17.69%	(4.34%)	8.57%	[1]

The after-tax returns are shown only for A Class shares. After-tax returns for other share classes will vary. 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 are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

NT EMERGING MARKETS FUND

RISK/RETURN

Investment Objective

The fund seeks capital growth.

Fees and Expenses

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

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

Annual Fund Operating Expenses NT EMERGING MARKETS FUND		INSTITUTIONAL CLASS	R6 CLASS
Management Fee		1.54%	1.39%
Distribution and Service (12b-1) Fees		none	none
Other Expenses		none	none
Acquired Fund Fees and Expenses		0.01%	0.01%
Total Annual Fund Operating Expenses		1.55%	1.40%
Fee Waiver	[1]	0.25%	0.25%
Total Annual Fund Operating Expenses After Waiver		1.30%	1.15%

Example

The example below is intended to help you compare the costs of investing in the fund with the costs 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, that you earn 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 NT EMERGING MARKETS FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INSTITUTIONAL CLASS	133	449	805	1,808
R6 CLASS	117	402	726	1,642

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 101% of the average value of its portfolio.

Principal Investment Strategies

The fund will invest at least 80% of its assets in equity securities of companies located in emerging market countries. The portfolio managers look for stocks of companies they believe will increase in value over time, using an investment strategy developed by American Century Investments. In implementing this strategy, the portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. The portfolio managers use a variety of analytical research tools and techniques to identify the stocks of companies that meet their investment criteria. Under normal market conditions, the fund's portfolios will primarily consist of securities of companies whose earnings or revenues are not only growing, but growing at an accelerating pace.

The fund is not permitted to invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry.

Principal Risks

•	Foreign Risk – The fund invests in foreign securities, which are generally riskier than U.S. securities. As a result, the fund is subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.
•	Small-Cap Stock Risk – Investing in securities of smaller foreign companies generally presents unique risks in addition to the typical risks of investing in foreign securities. Smaller companies may have limited financial resources, product lines, markets and have less publicly available information. In addition, securities of smaller companies may trade less frequently and in more limited volumes than securities of larger companies, which could lead to higher transaction costs. Smaller companies also may be more sensitive to changing economic conditions. These factors may cause investments in smaller foreign companies to experience more price volatility.
•	Currency Risk – Because the fund generally invests in securities denominated in foreign currencies, the fund is subject to currency risk, meaning that the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.
•	Emerging Market Risk – Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries.
	The fund considers a security to be an emerging markets security if its issuer is located outside the following list of developed countries: Australia, Austria, Belgium, Bermuda, Canada, Denmark, Finland, France, Germany, Greece, Hong Kong, Ireland, Israel, Italy, Japan, Luxembourg, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, the United Kingdom and the United States.
	Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries’ emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.
•	Growth Stocks – Investments in growth stocks may involve special risks and their prices may fluctuate more dramatically than the overall stock market.
•	Tobacco Exclusion – The fund's prohibition on tobacco-related investments may cause it to forego profitable investment opportunities.
•	Style Risk – If at any time the market is not favoring the fund's growth investment style, the fund's gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.
•	Market Risk – The value of a fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market.
•	Price Volatility – The value of a fund's shares may fluctuate significantly in the short term.
•	Principal Loss – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Fund Performance

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Institutional Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Calendar Year Total Returns

Highest Performance Quarter (2Q 2009): 31.74%

Lowest Performance Quarter (3Q 2008): -32.19%

As of June 30, 2013, the most recent calendar quarter end, the year-to-date return for the Institutional Class was -7.98%.

Average Annual Total Returns For the calendar year ended December 31, 2012

Average Annual Total Returns NT EMERGING MARKETS FUND	1 Year	5 Years	Since Inception	Inception Date
INSTITUTIONAL CLASS	24.40%	(4.69%)	4.03%	May 12, 2006
INSTITUTIONAL CLASS Return After Taxes on Distributions	24.62%	(4.83%)	3.38%	May 12, 2006
INSTITUTIONAL CLASS Return After Taxes on Distributions and Sale of Fund Shares	16.10%	(3.95%)	3.34%	May 12, 2006
MSCI Emerging Markets Growth Index (reflects no deduction for fees, expenses or taxes, other than foreign withholding tax)	20.56%	(1.95%)	4.92%	Apr. 30, 2006

The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary. The 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 are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

NT INTERNATIONAL GROWTH FUND

RISK/RETURN

Investment Objective

The fund seeks capital growth.

Fees and Expenses

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

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

Annual Fund Operating Expenses NT INTERNATIONAL GROWTH FUND	INSTITUTIONAL CLASS	R6 CLASS
Management Fee	1.08%	0.93%
Distribution and Service (12b-1) Fees	none	none
Other Expenses	0.01%	0.01%
Total Annual Fund Operating Expenses	1.09%	0.94%

Example

The example below is intended to help you compare the costs of investing in the fund with the costs 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, that you earn 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 NT INTERNATIONAL GROWTH FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INSTITUTIONAL CLASS	111	347	602	1,329
R6 CLASS	96	300	521	1,155

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 93% of the average value of its portfolio.

Principal Investment Strategies

The fund invests primarily in securities of companies located in at least three developed countries world-wide (excluding the United States). The portfolio managers look for stocks of companies they believe will increase in value over time, using an investment strategy developed by American Century Investments. In implementing this strategy, the portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on broad economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. The portfolio managers use a variety of analytical research tools and techniques to identify the stocks of companies that meet their investment criteria. Under normal market conditions, the fund's portfolio will primarily consist of securities of companies whose earnings or revenues are not only growing, but growing at an accelerating pace.

The fund is not permitted to invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry.

Principal Risks

• Foreign Risk – The fund invests primarily in foreign securities, which are generally riskier than U.S. securities. As a result the fund is subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience gains or losses. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• Currency Risk – Because the fund generally invests in securities denominated in foreign currencies, the fund is subject to currency risk, meaning that the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar.

• Emerging Market Risk – Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries' emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets.

• Growth Stocks – Investments in growth stocks may involve special risks and their prices may fluctuate more dramatically than the overall stock market.

• Style Risk – If at any time the market is not favoring the fund's growth investment style, the fund's gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.

• Tobacco Exclusion – The fund's prohibition on tobacco-related investments may cause it to forego profitable investment opportunities.

• Market Risk – The value of the fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors generally affecting the securities market.

• Price Volatility – The value of the fund's shares may fluctuate significantly in the short term.

• Principal Loss – At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.

An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

Fund Performance

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Institutional Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Calendar Year Total Returns

Highest Performance Quarter (2Q 2009): 22.72%

Lowest Performance Quarter (3Q 2008): -23.04%

As of June 30, 2013, the most recent calendar quarter end, the year-to-date return for the Institutional Class was 4.27%.

Average Annual Total Returns For the calendar year ended December 31, 2012

Average Annual Total Returns NT INTERNATIONAL GROWTH FUND	1 Year	5 Years	Since Inception	Inception Date
INSTITUTIONAL CLASS	22.35%	(2.24%)	1.74%	May 12, 2006
INSTITUTIONAL CLASS Return After Taxes on Distributions	22.31%	(2.32%)	1.60%	May 12, 2006
INSTITUTIONAL CLASS Return After Taxes on Distributions and Sale of Fund Shares	15.11%	(1.82%)	1.56%	May 12, 2006
MSCI EAFE (Europe, Australasia, Far East) Index (reflects no deduction for fees, expenses or taxes)	17.32%	(3.69%)	0.23%	Apr. 30, 2006
MSCI EAFE Growth Index (reflects no deduction for fees, expenses or taxes)	16.86%	(3.09%)	0.99%	Apr. 30, 2006

The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary. The 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 are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

[1] The advisor has agreed to waive 0.25 percentage points of the fund's management fee. The advisor expects this waiver to continue until March 31, 2015 and cannot terminate it prior to such date without the approval of the Board of Directors.

[1] Prior to September 4, 2007, this class was referred to as the Advisor Class and did not have a front-end sales charge. Performance prior to that date has been restated to reflect this charge.

[1] Prior to September 4, 2007, this class was referred to as the Advisor Class and did not have a front-end sales charge. Performance prior to that date has been restated to reflect this charge.

[1] Prior to December 3, 2007, this class was referred to as the Advisor Class and did not have a front-end sales charge. Performance prior to that date has been restated to reflect this charge.

[1] International Value acquired all the net assets of the Mason Street International Equity Fund on March 31, 2006, pursuant to a plan of reorganization approved by the acquired fund's shareholders on March 15, 2006. Performance information prior to April 1, 2006 is that of the Mason Street International Equity Fund.

[1] The advisor has agreed to waive 0.25 percentage points of the fund's management fee. The advisor expects this waiver to continue until March 31, 2015 and cannot terminate it prior to such date without the approval of the Board of Directors.