485BPOS

As Filed with the U.S. Securities and Exchange Commission on March 19, 2013

1933 Act File No. 2-14213

1940 Act File No. 811-0816

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C.  20549
__________________
FORM N-1A
__________________
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933		T
Pre-Effective Amendment No.		£
Post-Effective Amendment No. 134		T
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940		T
Amendment No. 134		T
(Check appropriate box or boxes.)
__________________
American Century 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)
þ	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 19th day of March 2013.

(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	March 19, 2013
* _________________________________ C. Jean Wade	Vice President, Treasurer and Chief Financial Officer	March 19, 2013
* _________________________________ Thomas A. Brown	Director	March 19, 2013
* _________________________________ Barry Fink	Director	March 19, 2013
* _________________________________ Andrea C. Hall, Ph.D.	Director	March 19, 2013
* _________________________________ Jan M. Lewis	Director	March 19, 2013
* _________________________________ James A. Olson	Director	March 19, 2013
* _________________________________ Donald H. Pratt	Chairman of the Board and Director	March 19, 2013
* _________________________________ M. Jeannine Strandjord	Director	March 19, 2013
* _________________________________ John R. Whitten	Director	March 19, 2013

* _________________________________ Stephen E. Yates Director March 19, 2013

*By:           /s/ Elizabeth L. Richards

____________________________________

Elizabeth L. Richards

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

[RiskReturnAbstract]

rr_RiskReturnAbstract

Document Type

dei_DocumentType

485BPOS

Document Period End Date

dei_DocumentPeriodEndDate

Oct. 31, 2012

Registrant Name

dei_EntityRegistrantName

AMERICAN CENTURY MUTUAL FUNDS, INC.

Central Index Key

dei_EntityCentralIndexKey

0000100334

Amendment Flag

dei_AmendmentFlag

false

Trading Symbol

dei_TradingSymbol

acmf

Document Creation Date

dei_DocumentCreationDate

Feb. 28, 2013

Document Effective Date

dei_DocumentEffectiveDate

Mar. 01, 2013

Prospectus Date

rr_ProspectusDate

Mar. 01, 2013

ALL CAP GROWTH FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 12 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 55% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

55.00%

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 12 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 portfolio managers look for stocks of companies of all sizes 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 and revenues. The portfolio managers’ principal analytical technique involves the identification of companies with earnings and revenues that are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. In addition to accelerating growth, the fund also considers companies demonstrating price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

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

• Small and Mid Cap Stocks — The fund invests in mid-sized and smaller companies, which may be more volatile and subject to greater risk than larger companies. Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs.

• 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.

• Foreign Securities — The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

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

• 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.

• 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. 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 (1Q 2012): 18.71%

Lowest Performance Quarter (4Q 2008): -26.56%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.71%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(26.56%)

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.

ALL CAP GROWTH FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.00%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

102

3 Years

rr_ExpenseExampleYear03

319

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

553

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,225

Annual Return 2003

rr_AnnualReturn2003

19.93%

Annual Return 2004

rr_AnnualReturn2004

7.18%

Annual Return 2005

rr_AnnualReturn2005

22.14%

Annual Return 2006

rr_AnnualReturn2006

17.21%

Annual Return 2007

rr_AnnualReturn2007

45.98%

Annual Return 2008

rr_AnnualReturn2008

(46.21%)

Annual Return 2009

rr_AnnualReturn2009

34.60%

Annual Return 2010

rr_AnnualReturn2010

22.48%

Annual Return 2011

rr_AnnualReturn2011

(3.16%)

Annual Return 2012

rr_AnnualReturn2012

15.71%

1 Year

rr_AverageAnnualReturnYear01

15.71%

5 Years

rr_AverageAnnualReturnYear05

(0.12%)

10 Years

rr_AverageAnnualReturnYear10

10.31%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 25, 1983

ALL CAP GROWTH FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

82

3 Years

rr_ExpenseExampleYear03

256

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

445

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

990

1 Year

rr_AverageAnnualReturnYear01

15.96%

Since Inception

rr_AverageAnnualReturnSinceInception

19.25%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2011

ALL CAP GROWTH FUND | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.25%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

695

3 Years

rr_ExpenseExampleYear03

949

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,223

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,999

1 Year

rr_AverageAnnualReturnYear01

8.80%

5 Years

rr_AverageAnnualReturnYear05

(1.54%)

^[1]

10 Years

rr_AverageAnnualReturnYear10

9.39%

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2011

ALL CAP GROWTH FUND | C CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.00%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

203

3 Years

rr_ExpenseExampleYear03

628

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,079

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,324

1 Year

rr_AverageAnnualReturnYear01

14.60%

5 Years

rr_AverageAnnualReturnYear05

(1.12%)

^[1]

10 Years

rr_AverageAnnualReturnYear10

9.21%

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2011

ALL CAP GROWTH FUND | R CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.50%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

153

3 Years

rr_ExpenseExampleYear03

475

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

819

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,789

1 Year

rr_AverageAnnualReturnYear01

15.16%

5 Years

rr_AverageAnnualReturnYear05

(0.62%)

^[1]

10 Years

rr_AverageAnnualReturnYear10

9.76%

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2011

ALL CAP GROWTH FUND | After Taxes on Distributions | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

14.51%

5 Years

rr_AverageAnnualReturnYear05

(0.42%)

10 Years

rr_AverageAnnualReturnYear10

10.15%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 25, 1983

ALL CAP GROWTH FUND | After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

11.84%

5 Years

rr_AverageAnnualReturnYear05

(0.11%)

10 Years

rr_AverageAnnualReturnYear10

9.22%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 25, 1983

ALL CAP GROWTH FUND | Russell 3000® Growth Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.21%

5 Years

rr_AverageAnnualReturnYear05

3.15%

10 Years

rr_AverageAnnualReturnYear10

7.69%

BALANCED FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 and current income by investing approximately 60% of its assets in equity securities and the remainder in bonds and other fixed-income securities.

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.

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 82% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

32.00%

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

For the equity portion of Balanced, the portfolio managers select stocks using quantitative management techniques in a two-step process. First, the managers rank stocks, primarily those of large (those with a market cap greater than $2 billion), publicly-traded U.S. companies from most attractive to least attractive based on each stock’s value as well as its growth potential. Second, the portfolio managers use a quantitative model to build a portfolio of stocks from the ranking described above that they believe will provide the optimal balance between risk and expected return. 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.

For the fixed-income portion of the fund, the portfolio managers invest in a diversified portfolio of high- and medium-grade non-money market debt securities. These securities, which may be payable in U.S. or foreign currencies, may include corporate bonds and notes, government securities and securities backed by mortgages or other assets. Shorter-term debt securities round out the portfolio.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Style Risk — If at any time the market is not favoring the quantitative investment style used to manage the fund’s equity portion, that portion’s gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.

• Investment Process 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 models will result in effective investment decisions for the fund. Additionally, the commonality of portfolio holdings across quantitative investment managers may amplify losses.

• Benchmark Correlation — The performance of the fund's equity portion will be tied to the performance of the S&P 500 Index. If the S&P 500 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.

• Interest Rate Risk — Investments in debt securities are sensitive to interest rate changes. Generally, the value of debt securities and the funds that hold them decline as interest rates rise. The fund’s fixed-income investments are designed to reduce this risk. Interest rate risk, however, is generally higher for the fixed-income portion of Balanced than for funds that have shorter-weighted maturities, such as money market funds and short-term bond funds.

• Credit Risk — Debt securities, even investment-grade debt securities, are subject to credit risk. Credit risk is the risk that the inability or perceived inability of the issuer to make interest and principal payments will cause the value of the securities to decrease. As a result the fund’s share price could also decrease. Changes in the credit rating of a debt security held by the fund could have a similar effect.

• Prepayment Risk — The fund may invest in debt securities backed by mortgages or other assets. If these underlying assets are prepaid, the fund may benefit less from declining interest rates than funds of similar maturity that invest less heavily in mortgage- and asset-backed securities.

• Foreign Securities Risk — Foreign securities have certain unique risks, such as currency risk, social, political and economic risk, and foreign market and trading risk. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• Derivative Risk — The use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional instruments. Derivatives are subject to a number of risks, including liquidity, interest rate, market, credit and correlation risk.

• Liquidity Risk — The fund may also be subject to liquidity risk. During periods of market turbulence or unusually low trading activity, in order to meet redemptions it may be necessary for the fund to sell securities at prices that could have an adverse effect on the fund’s share price.

• 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. 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.

The blended index is considered the benchmark for Balanced. It combines two widely known indices in proportion to the asset mix of the fund. Accordingly, 60% of the index is represented by the S&P 500 Index, which reflects the approximately 60% of the fund’s assets invested in stocks. The blended index’s remaining 40% is represented by the Barclays U.S. Aggregate Bond Index, which reflects the roughly 40% of the fund’s assets invested in fixed-income securities.

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 Additional Market Index [Text]

rr_PerformanceAdditionalMarketIndex

The blended index is considered the benchmark for Balanced. It combines two widely known indices in proportion to the asset mix of the fund. Accordingly, 60% of the index is represented by the S&P 500 Index, which reflects the approximately 60% of the fund's assets invested in stocks. The blended index's remaining 40% is represented by the Barclays U.S. Aggregate Bond Index, which reflects the roughly 40% of the fund's assets invested in fixed-income securities.

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): 10.48%

Lowest Performance Quarter (4Q 2008): -12.18%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

10.48%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(12.18%)

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.

BALANCED FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

0.90%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.91%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

93

3 Years

rr_ExpenseExampleYear03

291

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

504

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,120

Annual Return 2003

rr_AnnualReturn2003

19.59%

Annual Return 2004

rr_AnnualReturn2004

9.65%

Annual Return 2005

rr_AnnualReturn2005

4.80%

Annual Return 2006

rr_AnnualReturn2006

9.63%

Annual Return 2007

rr_AnnualReturn2007

5.01%

Annual Return 2008

rr_AnnualReturn2008

(20.33%)

Annual Return 2009

rr_AnnualReturn2009

16.36%

Annual Return 2010

rr_AnnualReturn2010

11.57%

Annual Return 2011

rr_AnnualReturn2011

5.43%

Annual Return 2012

rr_AnnualReturn2012

11.59%

1 Year

rr_AverageAnnualReturnYear01

11.59%

5 Years

rr_AverageAnnualReturnYear05

4.00%

10 Years

rr_AverageAnnualReturnYear10

6.76%

BALANCED FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.71%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

73

3 Years

rr_ExpenseExampleYear03

227

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

396

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

883

1 Year

rr_AverageAnnualReturnYear01

11.94%

5 Years

rr_AverageAnnualReturnYear05

4.22%

10 Years

rr_AverageAnnualReturnYear10

6.98%

BALANCED FUND | After Taxes on Distributions | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.72%

5 Years

rr_AverageAnnualReturnYear05

3.42%

10 Years

rr_AverageAnnualReturnYear10

5.92%

BALANCED FUND | After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

8.44%

5 Years

rr_AverageAnnualReturnYear05

3.21%

10 Years

rr_AverageAnnualReturnYear10

5.61%

BALANCED FUND | S&P 500® Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.00%

5 Years

rr_AverageAnnualReturnYear05

1.66%

10 Years

rr_AverageAnnualReturnYear10

7.10%

BALANCED FUND | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.21%

5 Years

rr_AverageAnnualReturnYear05

5.95%

10 Years

rr_AverageAnnualReturnYear10

5.18%

BALANCED FUND | Blended Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

11.31%

5 Years

rr_AverageAnnualReturnYear05

3.81%

10 Years

rr_AverageAnnualReturnYear10

6.62%

CAPITAL VALUE FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 12 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 32% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

32.00%

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 12 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 portfolio managers use a value investment strategy that invests primarily in stocks of medium to large companies that the portfolio managers believe are undervalued at the time of purchase. In selecting stocks, the portfolio managers look for companies that are temporarily out of favor in, or whose value is not yet recognized by, the market. To identify these companies, the portfolio managers look for companies with earnings, cash flows and/or assets that may not be reflected accurately in the companies’ stock prices.

The portfolio managers also attempt to minimize taxable distributions to fund shareholders.  The fund’s tax-sensitive techniques may, from time to time, be inconsistent with the fund’s objective of long-term capital growth. Since the fund focuses on after-tax returns, it may not provide as high a pre-tax return relative to other funds.

The portfolio managers may elect to sell a security, even if the sale results in a taxable gain, if they determine that the tax impact of the sale is outweighed by other factors. Such factors include the investment risk of holding the security or the availability of a replacement security that has a better potential return.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Value Investing – If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund’s shares may decline, even if stock prices generally are rising.

• Tax Risk – While the fund seeks to minimize taxable distributions to shareholders, it nonetheless may realize capital gains on the sale of investment securities and earn dividend income.  Federal tax laws require the fund to make distributions of such gains and income to its shareholders.  Distributions may be taxable as ordinary income, capital gains, or a combination of the two.

• 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. 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): 17.67%

Lowest Performance Quarter (4Q 2008): -20.69%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

17.67%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(20.69%)

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.

CAPITAL VALUE FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumAccountFee

25

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

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

28.21%

Annual Return 2004

rr_AnnualReturn2004

14.25%

Annual Return 2005

rr_AnnualReturn2005

3.70%

Annual Return 2006

rr_AnnualReturn2006

19.71%

Annual Return 2007

rr_AnnualReturn2007

(1.39%)

Annual Return 2008

rr_AnnualReturn2008

(36.84%)

Annual Return 2009

rr_AnnualReturn2009

19.32%

Annual Return 2010

rr_AnnualReturn2010

10.59%

Annual Return 2011

rr_AnnualReturn2011

1.22%

Annual Return 2012

rr_AnnualReturn2012

16.38%

1 Year

rr_AverageAnnualReturnYear01

16.38%

5 Years

rr_AverageAnnualReturnYear05

(0.37%)

10 Years

rr_AverageAnnualReturnYear10

5.81%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 31, 1999

CAPITAL VALUE FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumAccountFee

none

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

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

16.61%

5 Years

rr_AverageAnnualReturnYear05

(0.17%)

10 Years

rr_AverageAnnualReturnYear10

6.02%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2002

CAPITAL VALUE FUND | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumAccountFee

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

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

9.54%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(1.77%)

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

4.59%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

May 14, 2003

^[2]

CAPITAL VALUE FUND | After Taxes on Distributions | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.08%

5 Years

rr_AverageAnnualReturnYear05

(0.68%)

10 Years

rr_AverageAnnualReturnYear10

5.44%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 31, 1999

CAPITAL VALUE FUND | After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

11.06%

5 Years

rr_AverageAnnualReturnYear05

(0.37%)

10 Years

rr_AverageAnnualReturnYear10

5.07%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 31, 1999

CAPITAL VALUE FUND | Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

17.51%

5 Years

rr_AverageAnnualReturnYear05

0.59%

10 Years

rr_AverageAnnualReturnYear10

7.38%

FOCUSED GROWTH FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 11 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 59% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

59.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you 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 11 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 portfolio managers look for stocks of companies they believe will increase in value over time. 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 larger-sized companies that meet their investment criteria. Under normal market conditions, the fund’s portfolio will primarily consist of securities of companies demonstrating business improvement. Analytical indicators helping to identify signs of business improvement could include accelerating earnings or revenue growth rates, increasing cash flows, or other indications of the relative strength of a company’s business. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• 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.

• Foreign Securities — The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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 (1Q 2012): 16.60%

Lowest Performance Quarter (4Q 2008): -21.00%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

16.60%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.00%)

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.

FOCUSED GROWTH FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

103

3 Years

rr_ExpenseExampleYear03

322

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

559

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,236

Annual Return 2006

rr_AnnualReturn2006

7.17%

Annual Return 2007

rr_AnnualReturn2007

13.04%

Annual Return 2008

rr_AnnualReturn2008

(36.06%)

Annual Return 2009

rr_AnnualReturn2009

33.43%

Annual Return 2010

rr_AnnualReturn2010

16.10%

Annual Return 2011

rr_AnnualReturn2011

(3.36%)

Annual Return 2012

rr_AnnualReturn2012

15.50%

1 Year

rr_AverageAnnualReturnYear01

15.50%

5 Years

rr_AverageAnnualReturnYear05

2.03%

Since Inception

rr_AverageAnnualReturnSinceInception

4.90%

Inception Date

rr_AverageAnnualReturnInceptionDate

Feb. 28, 2005

FOCUSED GROWTH FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.81%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

83

3 Years

rr_ExpenseExampleYear03

259

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

450

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,002

1 Year

rr_AverageAnnualReturnYear01

15.78%

5 Years

rr_AverageAnnualReturnYear05

2.24%

Since Inception

rr_AverageAnnualReturnSinceInception

2.43%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

FOCUSED GROWTH FUND | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.26%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

696

3 Years

rr_ExpenseExampleYear03

952

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,228

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,010

1 Year

rr_AverageAnnualReturnYear01

8.66%

5 Years

rr_AverageAnnualReturnYear05

0.60%

Since Inception

rr_AverageAnnualReturnSinceInception

0.85%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

FOCUSED GROWTH FUND | C CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

204

3 Years

rr_ExpenseExampleYear03

632

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,084

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,334

1 Year

rr_AverageAnnualReturnYear01

14.43%

5 Years

rr_AverageAnnualReturnYear05

1.03%

Since Inception

rr_AverageAnnualReturnSinceInception

1.22%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

FOCUSED GROWTH FUND | R CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.51%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

154

3 Years

rr_ExpenseExampleYear03

478

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

824

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,800

1 Year

rr_AverageAnnualReturnYear01

14.97%

5 Years

rr_AverageAnnualReturnYear05

1.51%

Since Inception

rr_AverageAnnualReturnSinceInception

1.72%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

FOCUSED GROWTH FUND | After Taxes on Distributions | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.38%

5 Years

rr_AverageAnnualReturnYear05

1.95%

Since Inception

rr_AverageAnnualReturnSinceInception

4.30%

Inception Date

rr_AverageAnnualReturnInceptionDate

Feb. 28, 2005

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

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.23%

5 Years

rr_AverageAnnualReturnYear05

1.72%

Since Inception

rr_AverageAnnualReturnSinceInception

3.96%

Inception Date

rr_AverageAnnualReturnInceptionDate

Feb. 28, 2005

FOCUSED GROWTH FUND | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.26%

5 Years

rr_AverageAnnualReturnYear05

3.12%

Since Inception

rr_AverageAnnualReturnSinceInception

5.60%

Inception Date

rr_AverageAnnualReturnInceptionDate

Feb. 28, 2005

FUNDAMENTAL EQUITY FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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.

Objective, Secondary [Text Block]

rr_ObjectiveSecondaryTextBlock

Income is a secondary objective.

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. The fund’s B Class shares are not available for purchase, except through exchanges and dividend reinvestments.

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 18% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

18.00%

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 page13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information. The fund's B Class shares are not available for purchase, except through exchanges and dividend reinvestments.

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 (unless otherwise indicated), 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 generally invest in larger-sized companies using a quantitative model that combines fundamental measures of a stock’s value and growth potential. To measure value, the managers may use ratios of stock price-to-earnings and stock price-to-cash flow, among others. To measure growth, the managers may use the rate of growth of a company’s earnings and cash flow and changes in its earnings estimates, as well as other factors. The model also considers price momentum. The portfolio managers attempt to build a portfolio of stocks that provides better returns than, and a dividend yield comparable to, the S&P 500® Index, without taking on significant additional risk.

Under normal market conditions, the fund will invest at least 80% of its assets in equity securities.

When determining whether to sell a security, the portfolio managers consider among other things, a security’s price, whether a security’s risk parameters outweigh its return opportunities, general market conditions and any other factor deemed relevant by the portfolio managers.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Style Risk –If at any time the market is not favoring the fund’s investment process, 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.

• Benchmark Correlation – The fund’s performance will be tied to the performance of its benchmark, the S&P 500® Index. If the fund’s benchmark goes down, it is likely that the fund’s performance will go down.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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.

• 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. 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 (3Q 2009): 15.47%

Lowest Performance Quarter (4Q 2008): -20.53%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.47%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(20.53%)

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.

FUNDAMENTAL EQUITY FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

103

3 Years

rr_ExpenseExampleYear03

322

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

559

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,236

1 Year

rr_AverageAnnualReturnYear01

15.24%

5 Years

rr_AverageAnnualReturnYear05

1.51%

Since Inception

rr_AverageAnnualReturnSinceInception

6.32%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 29, 2005

FUNDAMENTAL EQUITY FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.81%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

83

3 Years

rr_ExpenseExampleYear03

259

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

450

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,002

1 Year

rr_AverageAnnualReturnYear01

15.46%

5 Years

rr_AverageAnnualReturnYear05

1.72%

Since Inception

rr_AverageAnnualReturnSinceInception

6.53%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 29, 2005

FUNDAMENTAL EQUITY FUND | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.26%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

696

3 Years

rr_ExpenseExampleYear03

952

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,228

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,010

Annual Return 2005

rr_AnnualReturn2005

10.94%

Annual Return 2006

rr_AnnualReturn2006

20.64%

Annual Return 2007

rr_AnnualReturn2007

13.73%

Annual Return 2008

rr_AnnualReturn2008

(35.57%)

Annual Return 2009

rr_AnnualReturn2009

21.85%

Annual Return 2010

rr_AnnualReturn2010

13.51%

Annual Return 2011

rr_AnnualReturn2011

3.93%

Annual Return 2012

rr_AnnualReturn2012

15.01%

1 Year

rr_AverageAnnualReturnYear01

8.42%

5 Years

rr_AverageAnnualReturnYear05

0.08%

Since Inception

rr_AverageAnnualReturnSinceInception

5.88%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2004

FUNDAMENTAL EQUITY FUND | B CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

5.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

604

3 Years

rr_ExpenseExampleYear03

932

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,184

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,142

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

204

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

632

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,084

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,142

1 Year

rr_AverageAnnualReturnYear01

10.10%

5 Years

rr_AverageAnnualReturnYear05

0.31%

Since Inception

rr_AverageAnnualReturnSinceInception

5.85%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2004

FUNDAMENTAL EQUITY FUND | C CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

204

3 Years

rr_ExpenseExampleYear03

632

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,084

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,334

1 Year

rr_AverageAnnualReturnYear01

14.18%

5 Years

rr_AverageAnnualReturnYear05

0.50%

Since Inception

rr_AverageAnnualReturnSinceInception

5.86%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2004

FUNDAMENTAL EQUITY FUND | R CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.51%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

154

3 Years

rr_ExpenseExampleYear03

478

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

824

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,800

1 Year

rr_AverageAnnualReturnYear01

14.72%

5 Years

rr_AverageAnnualReturnYear05

1.00%

Since Inception

rr_AverageAnnualReturnSinceInception

5.78%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 29, 2005

FUNDAMENTAL EQUITY FUND | After Taxes on Distributions | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

8.22%

5 Years

rr_AverageAnnualReturnYear05

(0.08%)

Since Inception

rr_AverageAnnualReturnSinceInception

5.49%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2004

FUNDAMENTAL EQUITY FUND | After Taxes on Distributions and Sale of Fund Shares | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.74%

5 Years

rr_AverageAnnualReturnYear05

0.04%

Since Inception

rr_AverageAnnualReturnSinceInception

4.96%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2004

FUNDAMENTAL EQUITY FUND | S&P 500® Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.00%

5 Years

rr_AverageAnnualReturnYear05

1.66%

Since Inception

rr_AverageAnnualReturnSinceInception

4.61%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 30, 2004

GROWTH FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 12 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 74% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

74.00%

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 12 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 portfolio managers look for stocks of companies they believe will increase in value over time. 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 larger-sized companies that meet their investment criteria. Under normal market conditions, the fund’s portfolio will primarily consist of securities of companies demonstrating business improvement. Analytical indicators helping to identify signs of business improvement could include accelerating earnings or revenue growth rates, increasing cash flows, or other indications of the relative strength of a company’s business. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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 (1Q 2012): 15.91%

Lowest Performance Quarter (4Q 2008): -22.91%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.91%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.91%)

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.

GROWTH FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.97%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.97%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

99

3 Years

rr_ExpenseExampleYear03

310

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

537

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,190

Annual Return 2003

rr_AnnualReturn2003

24.41%

Annual Return 2004

rr_AnnualReturn2004

9.91%

Annual Return 2005

rr_AnnualReturn2005

4.84%

Annual Return 2006

rr_AnnualReturn2006

7.94%

Annual Return 2007

rr_AnnualReturn2007

18.98%

Annual Return 2008

rr_AnnualReturn2008

(37.84%)

Annual Return 2009

rr_AnnualReturn2009

35.48%

Annual Return 2010

rr_AnnualReturn2010

17.64%

Annual Return 2011

rr_AnnualReturn2011

(0.90%)

Annual Return 2012

rr_AnnualReturn2012

13.91%

1 Year

rr_AverageAnnualReturnYear01

13.91%

5 Years

rr_AverageAnnualReturnYear05

2.26%

10 Years

rr_AverageAnnualReturnYear10

7.48%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 1971

GROWTH FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.77%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.77%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

79

3 Years

rr_ExpenseExampleYear03

246

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

428

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

955

1 Year

rr_AverageAnnualReturnYear01

14.14%

5 Years

rr_AverageAnnualReturnYear05

2.46%

10 Years

rr_AverageAnnualReturnYear10

7.69%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 16, 1997

GROWTH FUND | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.97%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.22%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

692

3 Years

rr_ExpenseExampleYear03

941

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,207

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,967

1 Year

rr_AverageAnnualReturnYear01

7.08%

^[2]

5 Years

rr_AverageAnnualReturnYear05

0.80%

^[2]

10 Years

rr_AverageAnnualReturnYear10

6.59%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 04, 1997

^[2]

GROWTH FUND | C CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.97%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.97%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

200

3 Years

rr_ExpenseExampleYear03

619

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,063

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,293

1 Year

rr_AverageAnnualReturnYear01

12.79%

5 Years

rr_AverageAnnualReturnYear05

1.24%

^[3]

10 Years

rr_AverageAnnualReturnYear10

6.42%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

GROWTH FUND | R CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.97%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.47%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

150

3 Years

rr_ExpenseExampleYear03

466

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

803

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,756

1 Year

rr_AverageAnnualReturnYear01

13.33%

5 Years

rr_AverageAnnualReturnYear05

1.75%

Since Inception

rr_AverageAnnualReturnSinceInception

5.91%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 29, 2003

GROWTH FUND | After Taxes on Distributions | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.23%

5 Years

rr_AverageAnnualReturnYear05

1.98%

10 Years

rr_AverageAnnualReturnYear10

7.32%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 1971

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

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.96%

5 Years

rr_AverageAnnualReturnYear05

1.91%

10 Years

rr_AverageAnnualReturnYear10

6.61%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 1971

GROWTH FUND | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.26%

5 Years

rr_AverageAnnualReturnYear05

3.12%

10 Years

rr_AverageAnnualReturnYear10

7.52%

HERITAGE FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 purchase 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. The fund’s B Class shares are not available for purchase, except through exchanges and dividend reinvestments.

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 72% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

72.00%

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 purchase 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. The fund's B Class shares are not available for purchase, except through exchanges and dividend reinvestments.

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 (unless otherwise indicated), 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 portfolio managers look for stocks of medium-sized and smaller 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 and revenues. The portfolio managers’ principal analytical technique involves the identification of companies with earnings and revenues that are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. In addition to accelerating growth, the fund also considers companies demonstrating price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

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

• Mid Cap Stocks – The fund invests in mid-sized and smaller companies, which may be more volatile and subject to greater risk than larger companies. Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs.

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

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

• 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.

• 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. 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 (3Q 2010): 18.36%

Lowest Performance Quarter (4Q 2008): -26.63%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2010

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.36%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(26.63%)

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.

HERITAGE FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

103

3 Years

rr_ExpenseExampleYear03

322

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

559

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,236

Annual Return 2003

rr_AnnualReturn2003

21.65%

Annual Return 2004

rr_AnnualReturn2004

7.05%

Annual Return 2005

rr_AnnualReturn2005

22.23%

Annual Return 2006

rr_AnnualReturn2006

17.05%

Annual Return 2007

rr_AnnualReturn2007

45.77%

Annual Return 2008

rr_AnnualReturn2008

(46.17%)

Annual Return 2009

rr_AnnualReturn2009

36.85%

Annual Return 2010

rr_AnnualReturn2010

31.37%

Annual Return 2011

rr_AnnualReturn2011

(6.53%)

Annual Return 2012

rr_AnnualReturn2012

16.04%

1 Year

rr_AverageAnnualReturnYear01

16.04%

5 Years

rr_AverageAnnualReturnYear05

0.97%

10 Years

rr_AverageAnnualReturnYear10

11.03%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 10, 1987

HERITAGE FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.81%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

83

3 Years

rr_ExpenseExampleYear03

259

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

450

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,002

1 Year

rr_AverageAnnualReturnYear01

16.26%

5 Years

rr_AverageAnnualReturnYear05

1.18%

10 Years

rr_AverageAnnualReturnYear10

11.25%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 16, 1997

HERITAGE FUND | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.26%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

696

3 Years

rr_ExpenseExampleYear03

952

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,228

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,010

1 Year

rr_AverageAnnualReturnYear01

9.13%

^[4]

5 Years

rr_AverageAnnualReturnYear05

(0.46%)

^[4]

10 Years

rr_AverageAnnualReturnYear10

10.10%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 11, 1997

^[4]

HERITAGE FUND | B CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

5.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

604

3 Years

rr_ExpenseExampleYear03

932

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,184

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,142

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

204

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

632

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,084

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,142

1 Year

rr_AverageAnnualReturnYear01

10.94%

5 Years

rr_AverageAnnualReturnYear05

(0.23%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.03%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

HERITAGE FUND | C CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

204

3 Years

rr_ExpenseExampleYear03

632

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,084

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,334

1 Year

rr_AverageAnnualReturnYear01

14.88%

5 Years

rr_AverageAnnualReturnYear05

(0.03%)

10 Years

rr_AverageAnnualReturnYear10

9.94%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 26, 2001

HERITAGE FUND | R CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.51%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

154

3 Years

rr_ExpenseExampleYear03

478

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

824

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,800

1 Year

rr_AverageAnnualReturnYear01

15.47%

5 Years

rr_AverageAnnualReturnYear05

0.47%

Since Inception

rr_AverageAnnualReturnSinceInception

1.71%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

HERITAGE FUND | After Taxes on Distributions | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.68%

5 Years

rr_AverageAnnualReturnYear05

0.87%

10 Years

rr_AverageAnnualReturnYear10

10.78%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 10, 1987

HERITAGE FUND | After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.90%

5 Years

rr_AverageAnnualReturnYear05

0.81%

10 Years

rr_AverageAnnualReturnYear10

9.84%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 10, 1987

HERITAGE FUND | Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.81%

5 Years

rr_AverageAnnualReturnYear05

3.23%

10 Years

rr_AverageAnnualReturnYear10

10.32%

NEW OPPORTUNITIES FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 12 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 63% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

63.00%

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 12 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 portfolio managers look for stocks of small and mid-sized 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 and revenues. The portfolio managers’ principal analytical technique involves the identification of companies with earnings and revenues that are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. In addition to accelerating growth, the fund also may consider companies whose stocks demonstrate price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

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

• Small and Mid Cap Stocks – The smaller and medium-sized companies in which the fund invests may be more volatile and subject to greater risk than larger companies. Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs.

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• IPO Risk – The fund’s performance may be affected by investments in initial public offerings.

• 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. 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 (3Q 2009): 19.10%

Lowest Performance Quarter (4Q 2008): -25.16%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

19.10%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(25.16%)

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.

NEW OPPORTUNITIES FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

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

rr_RedemptionFeeOverRedemption

(2.00%)

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

1.50%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.03%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.53%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

156

3 Years

rr_ExpenseExampleYear03

484

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

835

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,822

Annual Return 2003

rr_AnnualReturn2003

28.75%

Annual Return 2004

rr_AnnualReturn2004

6.30%

Annual Return 2005

rr_AnnualReturn2005

6.82%

Annual Return 2006

rr_AnnualReturn2006

10.76%

Annual Return 2007

rr_AnnualReturn2007

23.07%

Annual Return 2008

rr_AnnualReturn2008

(42.42%)

Annual Return 2009

rr_AnnualReturn2009

26.34%

Annual Return 2010

rr_AnnualReturn2010

29.32%

Annual Return 2011

rr_AnnualReturn2011

(4.19%)

Annual Return 2012

rr_AnnualReturn2012

14.50%

1 Year

rr_AverageAnnualReturnYear01

14.50%

5 Years

rr_AverageAnnualReturnYear05

0.63%

10 Years

rr_AverageAnnualReturnYear10

7.47%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 26, 1996

NEW OPPORTUNITIES FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

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

rr_RedemptionFeeOverRedemption

(2.00%)

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.30%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.03%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.33%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

136

3 Years

rr_ExpenseExampleYear03

422

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

730

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,601

1 Year

rr_AverageAnnualReturnYear01

14.73%

Since Inception

rr_AverageAnnualReturnSinceInception

12.17%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

NEW OPPORTUNITIES FUND | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

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

rr_RedemptionFeeOverRedemption

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.50%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.03%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.78%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

746

3 Years

rr_ExpenseExampleYear03

1,104

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,485

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,547

1 Year

rr_AverageAnnualReturnYear01

7.78%

5 Years

rr_AverageAnnualReturnYear05

(0.80%)

^[5]

10 Years

rr_AverageAnnualReturnYear10

6.58%

^[5]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

NEW OPPORTUNITIES FUND | C CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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%

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

rr_RedemptionFeeOverRedemption

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.50%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.03%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.53%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

257

3 Years

rr_ExpenseExampleYear03

789

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,346

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,860

1 Year

rr_AverageAnnualReturnYear01

13.39%

5 Years

rr_AverageAnnualReturnYear05

(0.39%)

^[5]

10 Years

rr_AverageAnnualReturnYear10

6.40%

^[5]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

NEW OPPORTUNITIES FUND | R CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

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

rr_RedemptionFeeOverRedemption

(2.00%)

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.50%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.03%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.03%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

207

3 Years

rr_ExpenseExampleYear03

638

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,094

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,355

1 Year

rr_AverageAnnualReturnYear01

13.95%

5 Years

rr_AverageAnnualReturnYear05

0.12%

^[5]

10 Years

rr_AverageAnnualReturnYear10

6.93%

^[5]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

NEW OPPORTUNITIES FUND | After Taxes on Distributions | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

14.50%

5 Years

rr_AverageAnnualReturnYear05

0.63%

10 Years

rr_AverageAnnualReturnYear10

7.47%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 26, 1996

NEW OPPORTUNITIES FUND | After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.43%

5 Years

rr_AverageAnnualReturnYear05

0.54%

10 Years

rr_AverageAnnualReturnYear10

6.61%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 26, 1996

NEW OPPORTUNITIES FUND | Russell 2500® Growth Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.13%

5 Years

rr_AverageAnnualReturnYear05

4.07%

10 Years

rr_AverageAnnualReturnYear10

10.55%

NT GROWTH FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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.

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 87% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

87.00%

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 portfolio managers look for stocks of companies they believe will increase in value over time. 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 larger-sized companies that meet their investment criteria. Under normal market conditions, the fund’s portfolio will primarily consist of securities of companies demonstrating business improvement. Analytical indicators helping to identify signs of business improvement could include accelerating earnings or revenue growth rates, increasing cash flows, or other indications of the relative strength of a company’s business. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

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

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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): 15.77%

Lowest Performance Quarter (4Q 2008): -22.96%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.77%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.96%)

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

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 Closing [Text Block]

rr_PerformanceTableClosingTextBlock

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 GROWTH FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

Management Fee

rr_ManagementFeesOverAssets

0.77%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.77%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

79

3 Years

rr_ExpenseExampleYear03

246

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

428

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

955

Annual Return 2007

rr_AnnualReturn2007

19.08%

Annual Return 2008

rr_AnnualReturn2008

(37.68%)

Annual Return 2009

rr_AnnualReturn2009

36.21%

Annual Return 2010

rr_AnnualReturn2010

17.94%

Annual Return 2011

rr_AnnualReturn2011

(0.79%)

Annual Return 2012

rr_AnnualReturn2012

13.84%

1 Year

rr_AverageAnnualReturnYear01

13.84%

5 Years

rr_AverageAnnualReturnYear05

2.48%

Since Inception

rr_AverageAnnualReturnSinceInception

5.64%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT GROWTH FUND | After Taxes on Distributions | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.19%

5 Years

rr_AverageAnnualReturnYear05

2.21%

Since Inception

rr_AverageAnnualReturnSinceInception

5.25%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

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

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.89%

5 Years

rr_AverageAnnualReturnYear05

2.10%

Since Inception

rr_AverageAnnualReturnSinceInception

4.80%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT GROWTH FUND | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.26%

5 Years

rr_AverageAnnualReturnYear05

3.12%

Since Inception

rr_AverageAnnualReturnSinceInception

4.97%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 30, 2006

NT VISTA FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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.

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 92% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

92.00%

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 portfolio managers primarily look for stocks of medium-sized and smaller 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 and revenues. The portfolio managers’ principal analytical technique involves the identification of companies with earnings and revenues that are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. In addition to accelerating growth, the fund also considers companies demonstrating price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

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

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

• Mid Cap Stocks –  The fund invests in mid-sized and smaller companies, which may be more volatile and subject to greater risk than larger companies. Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs.

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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 (1Q 2012): 16.67%

Lowest Performance Quarter (4Q 2008): -25.63%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

16.67%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(25.63%)

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 Closing [Text Block]

rr_PerformanceTableClosingTextBlock

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 VISTA FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

Management Fee

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.81%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

83

3 Years

rr_ExpenseExampleYear03

259

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

450

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,002

Annual Return 2007

rr_AnnualReturn2007

38.04%

Annual Return 2008

rr_AnnualReturn2008

(48.05%)

Annual Return 2009

rr_AnnualReturn2009

22.69%

Annual Return 2010

rr_AnnualReturn2010

24.25%

Annual Return 2011

rr_AnnualReturn2011

(7.43%)

Annual Return 2012

rr_AnnualReturn2012

15.58%

1 Year

rr_AverageAnnualReturnYear01

15.58%

5 Years

rr_AverageAnnualReturnYear05

(3.25%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.58%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT VISTA FUND | After Taxes on Distributions | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.56%

5 Years

rr_AverageAnnualReturnYear05

(3.31%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.54%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT VISTA FUND | After Taxes on Distributions and Sale of Fund Shares | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.17%

5 Years

rr_AverageAnnualReturnYear05

(2.74%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.35%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT VISTA FUND | Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.81%

5 Years

rr_AverageAnnualReturnYear05

3.23%

Since Inception

rr_AverageAnnualReturnSinceInception

4.46%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 30, 2006

SELECT FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 12 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 17% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

17.00%

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 12 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 portfolio managers look for stocks of companies they believe will increase in value over time. 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 larger-sized 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. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. Among other variables, the portfolio managers will consider a company’s valuation and profitability. Other analytical techniques include evaluating stock price momentum, as well as identifying additional signs of business improvement, such as increasing cash flows, or other indications of the relative strength of a company’s business. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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 (1Q 2012): 17.25%

Lowest Performance Quarter (4Q 2008): -21.82%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jan. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

17.25%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.82%)

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.

SELECT FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.00%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

102

3 Years

rr_ExpenseExampleYear03

319

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

553

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,225

Annual Return 2003

rr_AnnualReturn2003

24.74%

Annual Return 2004

rr_AnnualReturn2004

7.35%

Annual Return 2005

rr_AnnualReturn2005

0.86%

Annual Return 2006

rr_AnnualReturn2006

(1.79%)

Annual Return 2007

rr_AnnualReturn2007

21.67%

Annual Return 2008

rr_AnnualReturn2008

(39.67%)

Annual Return 2009

rr_AnnualReturn2009

34.79%

Annual Return 2010

rr_AnnualReturn2010

14.58%

Annual Return 2011

rr_AnnualReturn2011

1.42%

Annual Return 2012

rr_AnnualReturn2012

14.74%

1 Year

rr_AverageAnnualReturnYear01

14.74%

5 Years

rr_AverageAnnualReturnYear05

1.63%

10 Years

rr_AverageAnnualReturnYear10

5.75%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 1971

SELECT FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

82

3 Years

rr_ExpenseExampleYear03

256

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

445

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

990

1 Year

rr_AverageAnnualReturnYear01

14.97%

5 Years

rr_AverageAnnualReturnYear05

1.84%

10 Years

rr_AverageAnnualReturnYear10

5.96%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 13, 1997

SELECT FUND | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.25%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

695

3 Years

rr_ExpenseExampleYear03

949

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,223

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,999

1 Year

rr_AverageAnnualReturnYear01

7.89%

^[6]

5 Years

rr_AverageAnnualReturnYear05

0.19%

^[6]

10 Years

rr_AverageAnnualReturnYear10

4.87%

^[6]

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 08, 1997

^[6]

SELECT FUND | C CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.00%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

203

3 Years

rr_ExpenseExampleYear03

628

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,079

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,324

1 Year

rr_AverageAnnualReturnYear01

13.62%

5 Years

rr_AverageAnnualReturnYear05

0.62%

Since Inception

rr_AverageAnnualReturnSinceInception

5.04%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jan. 31, 2003

SELECT FUND | R CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.50%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

153

3 Years

rr_ExpenseExampleYear03

475

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

819

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,789

1 Year

rr_AverageAnnualReturnYear01

14.20%

5 Years

rr_AverageAnnualReturnYear05

1.13%

Since Inception

rr_AverageAnnualReturnSinceInception

3.06%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 29, 2005

SELECT FUND | After Taxes on Distributions | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

14.63%

5 Years

rr_AverageAnnualReturnYear05

1.55%

10 Years

rr_AverageAnnualReturnYear10

5.50%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 1971

SELECT FUND | After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.75%

5 Years

rr_AverageAnnualReturnYear05

1.38%

10 Years

rr_AverageAnnualReturnYear10

4.98%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 30, 1971

SELECT FUND | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.26%

5 Years

rr_AverageAnnualReturnYear05

3.12%

10 Years

rr_AverageAnnualReturnYear10

7.52%

SMALL CAP GROWTH FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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. The fund’s B Class shares are not available for purchase, except through exchanges and dividend reinvestments.

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 62% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

62.00%

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. The fund's B Class shares are not available for purchase, except through exchanges and dividend reinvestments.

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 (unless otherwise indicated), 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

Under normal market conditions, the fund will invest at least 80% of its assets in small cap companies. The portfolio managers consider small cap companies to include those with a market capitalization that does not exceed that of the largest company in the Russell 2000 Growth Index.

The portfolio managers look for stocks of smaller-sized 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 and revenues. The portfolio managers’ principal analytical technique involves the identification of companies with earnings and revenues that are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. In addition to accelerating growth, the fund also may consider companies whose stocks demonstrate price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

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

• Small Cap Stocks – The smaller companies in which the fund invests may be more volatile and subject to greater risk than larger companies.  Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs.

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• IPO Risk – The fund’s performance may be affected by investments in initial public offerings.

• 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. 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 (4Q 2003): 21.51%

Lowest Performance Quarter (3Q 2011): -25.36%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

21.51%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(25.36%)

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.

SMALL CAP GROWTH FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

none

Exchange Fee (as a percentage of Amount Redeemed)

rr_ExchangeFeeOverRedemption

2.00%

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

1.42%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.04%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.46%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

149

3 Years

rr_ExpenseExampleYear03

462

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

798

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,745

Annual Return 2003

rr_AnnualReturn2003

47.88%

Annual Return 2004

rr_AnnualReturn2004

11.14%

Annual Return 2005

rr_AnnualReturn2005

5.06%

Annual Return 2006

rr_AnnualReturn2006

13.64%

Annual Return 2007

rr_AnnualReturn2007

23.81%

Annual Return 2008

rr_AnnualReturn2008

(42.00%)

Annual Return 2009

rr_AnnualReturn2009

24.85%

Annual Return 2010

rr_AnnualReturn2010

30.09%

Annual Return 2011

rr_AnnualReturn2011

(5.18%)

Annual Return 2012

rr_AnnualReturn2012

14.59%

1 Year

rr_AverageAnnualReturnYear01

14.59%

5 Years

rr_AverageAnnualReturnYear05

0.47%

10 Years

rr_AverageAnnualReturnYear10

9.53%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 01, 2001

SMALL CAP GROWTH FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

none

Exchange Fee (as a percentage of Amount Redeemed)

rr_ExchangeFeeOverRedemption

2.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.22%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.04%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.26%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

129

3 Years

rr_ExpenseExampleYear03

400

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

692

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,522

1 Year

rr_AverageAnnualReturnYear01

14.64%

5 Years

rr_AverageAnnualReturnYear05

0.63%

Since Inception

rr_AverageAnnualReturnSinceInception

1.90%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 18, 2007

SMALL CAP GROWTH FUND | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

none

Exchange Fee (as a percentage of Amount Redeemed)

rr_ExchangeFeeOverRedemption

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.42%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.04%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.71%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

739

3 Years

rr_ExpenseExampleYear03

1,084

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,451

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,476

1 Year

rr_AverageAnnualReturnYear01

7.69%

5 Years

rr_AverageAnnualReturnYear05

(0.96%)

Since Inception

rr_AverageAnnualReturnSinceInception

8.93%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jan. 31, 2003

SMALL CAP GROWTH FUND | B CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Exchange Fee (as a percentage of Amount Redeemed)

rr_ExchangeFeeOverRedemption

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.42%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.04%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.46%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

650

3 Years

rr_ExpenseExampleYear03

1,068

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,411

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,607

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

250

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

768

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,311

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,607

1 Year

rr_AverageAnnualReturnYear01

9.50%

5 Years

rr_AverageAnnualReturnYear05

(0.74%)

Since Inception

rr_AverageAnnualReturnSinceInception

8.77%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jan. 31, 2003

SMALL CAP GROWTH FUND | C CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Exchange Fee (as a percentage of Amount Redeemed)

rr_ExchangeFeeOverRedemption

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.42%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.04%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.46%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

250

3 Years

rr_ExpenseExampleYear03

768

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,311

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,791

1 Year

rr_AverageAnnualReturnYear01

13.44%

5 Years

rr_AverageAnnualReturnYear05

(0.56%)

Since Inception

rr_AverageAnnualReturnSinceInception

8.80%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jan. 31, 2003

SMALL CAP GROWTH FUND | R CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)

rr_MaximumDeferredSalesChargeOverOther

none

Exchange Fee (as a percentage of Amount Redeemed)

rr_ExchangeFeeOverRedemption

2.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.42%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.04%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.96%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

199

3 Years

rr_ExpenseExampleYear03

616

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,058

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,282

1 Year

rr_AverageAnnualReturnYear01

13.83%

5 Years

rr_AverageAnnualReturnYear05

(0.05%)

Since Inception

rr_AverageAnnualReturnSinceInception

(0.35%)

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

SMALL CAP GROWTH FUND | After Taxes on Distributions | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

14.56%

5 Years

rr_AverageAnnualReturnYear05

0.46%

10 Years

rr_AverageAnnualReturnYear10

9.19%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 01, 2001

SMALL CAP GROWTH FUND | After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.53%

5 Years

rr_AverageAnnualReturnYear05

0.40%

10 Years

rr_AverageAnnualReturnYear10

8.36%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 01, 2001

SMALL CAP GROWTH FUND | Russell 2000® Growth Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

14.59%

5 Years

rr_AverageAnnualReturnYear05

3.49%

10 Years

rr_AverageAnnualReturnYear10

9.80%

ULTRA FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 12 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 13% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

13.00%

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 12 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 portfolio managers look for stocks of companies they believe will increase in value over time. 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 larger-sized 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. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. Among other variables, the portfolio managers will consider the fund’s growth and momentum profile relative to the benchmark. Other analytical techniques help identify additional signs of business improvement, such as increasing cash flows, or other indications of the relative strength of a company’s business. In addition to accelerating growth and other signs of business improvement, the fund also considers companies demonstrating price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• 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.

• Foreign Securities — The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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 (1Q 2012): 15.53%

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

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.53%

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 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.

ULTRA FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.99%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.99%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

101

3 Years

rr_ExpenseExampleYear03

316

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

548

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,213

Annual Return 2003

rr_AnnualReturn2003

25.83%

Annual Return 2004

rr_AnnualReturn2004

10.69%

Annual Return 2005

rr_AnnualReturn2005

2.12%

Annual Return 2006

rr_AnnualReturn2006

(3.28%)

Annual Return 2007

rr_AnnualReturn2007

21.83%

Annual Return 2008

rr_AnnualReturn2008

(41.74%)

Annual Return 2009

rr_AnnualReturn2009

35.36%

Annual Return 2010

rr_AnnualReturn2010

16.56%

Annual Return 2011

rr_AnnualReturn2011

1.19%

Annual Return 2012

rr_AnnualReturn2012

14.18%

1 Year

rr_AverageAnnualReturnYear01

14.18%

5 Years

rr_AverageAnnualReturnYear05

1.21%

10 Years

rr_AverageAnnualReturnYear10

5.93%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 02, 1981

ULTRA FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.79%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.79%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

81

3 Years

rr_ExpenseExampleYear03

253

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

439

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

978

1 Year

rr_AverageAnnualReturnYear01

14.39%

5 Years

rr_AverageAnnualReturnYear05

1.42%

10 Years

rr_AverageAnnualReturnYear10

6.14%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 14, 1996

ULTRA FUND | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.99%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.24%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

694

3 Years

rr_ExpenseExampleYear03

946

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,218

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,988

1 Year

rr_AverageAnnualReturnYear01

7.33%

^[7]

5 Years

rr_AverageAnnualReturnYear05

(0.23%)

^[7]

10 Years

rr_AverageAnnualReturnYear10

5.05%

^[7]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 02, 1996

^[7]

ULTRA FUND | C CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.99%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.99%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

202

3 Years

rr_ExpenseExampleYear03

625

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,073

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,314

1 Year

rr_AverageAnnualReturnYear01

13.04%

5 Years

rr_AverageAnnualReturnYear05

0.21%

10 Years

rr_AverageAnnualReturnYear10

4.89%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 29, 2001

ULTRA FUND | R CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.99%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.49%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

152

3 Years

rr_ExpenseExampleYear03

472

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

814

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,778

1 Year

rr_AverageAnnualReturnYear01

13.59%

5 Years

rr_AverageAnnualReturnYear05

0.70%

Since Inception

rr_AverageAnnualReturnSinceInception

4.03%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 29, 2003

ULTRA FUND | After Taxes on Distributions | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

14.10%

5 Years

rr_AverageAnnualReturnYear05

1.16%

10 Years

rr_AverageAnnualReturnYear10

5.40%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 02, 1981

ULTRA FUND | After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.33%

5 Years

rr_AverageAnnualReturnYear05

1.02%

10 Years

rr_AverageAnnualReturnYear10

5.16%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 02, 1981

ULTRA FUND | S&P 500® Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.00%

5 Years

rr_AverageAnnualReturnYear05

1.66%

10 Years

rr_AverageAnnualReturnYear10

7.10%

ULTRA FUND | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.26%

5 Years

rr_AverageAnnualReturnYear05

3.12%

10 Years

rr_AverageAnnualReturnYear10

7.52%

VEEDOT FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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.

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 257% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

257.00%

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 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 an approach to common stock investing that relies heavily on quantitative tools to identify companies, regardless of size, industry type or geographic location, whose share price patterns suggest their stocks are likely to increase in value. This technical analysis is particularly oriented to identifying attractive price patterns for companies whose earnings and revenues are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. These companies would be candidates for purchase. Conversely, companies whose share price patterns suggest a likely decline in price would be candidates for sale, if owned by the fund. On occasion, the process may look favorably on a company whose share price pattern appears attractive even though the company looks less attractive based on the growth screen.

The process driving the fund is specifically designed to respond quickly to changing stock market conditions. As a result, the fund’s portfolio turnover, perhaps as much as 200-400% per year or more, may be significantly higher than that of many other funds.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

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

• Investment Process – There is also risk associated with reliance on the fund’s computer-based investment process. If the investment style embedded in this process falls out of favor with the market, the fund’s performance may suffer.

• Nondiversification – The fund is classified as nondiversified. This gives the portfolio managers the flexibility to hold large positions in a small number of securities. If so, a price change in any one of those securities may have a greater impact on the fund’s share prices than would be the case in a diversified fund.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.  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.

• 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 Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

Nondiversification - The fund is classified as nondiversified. This gives the portfolio managers the flexibility to hold large positions in a small number of securities. If so, a price change in any one of those securities may have a greater impact on the fund's share prices than would be the case in a diversified 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. 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): 20.74%

Lowest Performance Quarter (3Q 2008): -25.25%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

20.74%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(25.25%)

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.

VEEDOT FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

Exchange Fee (as a percentage of Amount Redeemed)

rr_ExchangeFeeOverRedemption

2.00%

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

1.25%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.26%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

129

3 Years

rr_ExpenseExampleYear03

400

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

692

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,522

Annual Return 2003

rr_AnnualReturn2003

42.42%

Annual Return 2004

rr_AnnualReturn2004

7.16%

Annual Return 2005

rr_AnnualReturn2005

5.42%

Annual Return 2006

rr_AnnualReturn2006

10.10%

Annual Return 2007

rr_AnnualReturn2007

32.04%

Annual Return 2008

rr_AnnualReturn2008

(41.70%)

Annual Return 2009

rr_AnnualReturn2009

8.55%

Annual Return 2010

rr_AnnualReturn2010

13.35%

Annual Return 2011

rr_AnnualReturn2011

4.98%

Annual Return 2012

rr_AnnualReturn2012

11.31%

1 Year

rr_AverageAnnualReturnYear01

11.31%

5 Years

rr_AverageAnnualReturnYear05

(3.46%)

10 Years

rr_AverageAnnualReturnYear10

6.96%

VEEDOT FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

Exchange Fee (as a percentage of Amount Redeemed)

rr_ExchangeFeeOverRedemption

2.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.05%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.06%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

108

3 Years

rr_ExpenseExampleYear03

338

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

585

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,294

1 Year

rr_AverageAnnualReturnYear01

11.49%

5 Years

rr_AverageAnnualReturnYear05

(3.28%)

10 Years

rr_AverageAnnualReturnYear10

7.16%

VEEDOT FUND | After Taxes on Distributions | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

11.00%

5 Years

rr_AverageAnnualReturnYear05

(3.58%)

10 Years

rr_AverageAnnualReturnYear10

6.89%

VEEDOT FUND | After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.77%

5 Years

rr_AverageAnnualReturnYear05

(2.93%)

10 Years

rr_AverageAnnualReturnYear10

6.14%

VEEDOT FUND | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.42%

5 Years

rr_AverageAnnualReturnYear05

2.04%

10 Years

rr_AverageAnnualReturnYear10

7.68%

VISTA FUND

[RiskReturnAbstract]

rr_RiskReturnAbstract

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 71% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

71.00%

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 portfolio managers primarily look for stocks of medium-sized and smaller 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 and revenues. The portfolio managers’ principal analytical technique involves the identification of companies with earnings and revenues that are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. In addition to accelerating growth, the fund also considers companies demonstrating price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

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

• Mid Cap Stocks – The fund invests in mid-sized and smaller companies, which may be more volatile and subject to greater risk than larger companies. Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs.

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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): 18.32%

Lowest Performance Quarter (4Q 2008): -26.05%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.32%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(26.05%)

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.

VISTA FUND | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

103

3 Years

rr_ExpenseExampleYear03

322

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

559

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,236

Annual Return 2003

rr_AnnualReturn2003

42.82%

Annual Return 2004

rr_AnnualReturn2004

15.79%

Annual Return 2005

rr_AnnualReturn2005

8.88%

Annual Return 2006

rr_AnnualReturn2006

9.05%

Annual Return 2007

rr_AnnualReturn2007

38.70%

Annual Return 2008

rr_AnnualReturn2008

(48.68%)

Annual Return 2009

rr_AnnualReturn2009

21.86%

Annual Return 2010

rr_AnnualReturn2010

23.87%

Annual Return 2011

rr_AnnualReturn2011

(8.02%)

Annual Return 2012

rr_AnnualReturn2012

15.48%

1 Year

rr_AverageAnnualReturnYear01

15.48%

5 Years

rr_AverageAnnualReturnYear05

(3.82%)

10 Years

rr_AverageAnnualReturnYear10

8.40%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 25, 1983

VISTA FUND | INSTITUTIONAL CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.81%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

83

3 Years

rr_ExpenseExampleYear03

259

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

450

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,002

1 Year

rr_AverageAnnualReturnYear01

15.72%

5 Years

rr_AverageAnnualReturnYear05

(3.62%)

10 Years

rr_AverageAnnualReturnYear10

8.61%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 14, 1996

VISTA FUND | A CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.26%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

696

3 Years

rr_ExpenseExampleYear03

952

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,228

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,010

1 Year

rr_AverageAnnualReturnYear01

8.57%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(5.17%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

7.49%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 02, 1996

^[2]

VISTA FUND | C CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

204

3 Years

rr_ExpenseExampleYear03

632

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,084

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,334

1 Year

rr_AverageAnnualReturnYear01

14.30%

5 Years

rr_AverageAnnualReturnYear05

(4.77%)

^[3]

10 Years

rr_AverageAnnualReturnYear10

7.33%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

VISTA FUND | R CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

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

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.51%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

154

3 Years

rr_ExpenseExampleYear03

478

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

824

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,800

1 Year

rr_AverageAnnualReturnYear01

14.85%

5 Years

rr_AverageAnnualReturnYear05

(4.30%)

Since Inception

rr_AverageAnnualReturnSinceInception

2.92%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 29, 2005

VISTA FUND | After Taxes on Distributions | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.48%

5 Years

rr_AverageAnnualReturnYear05

(3.82%)

10 Years

rr_AverageAnnualReturnYear10

8.18%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 25, 1983

VISTA FUND | After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.07%

5 Years

rr_AverageAnnualReturnYear05

(3.21%)

10 Years

rr_AverageAnnualReturnYear10

7.43%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 25, 1983

VISTA FUND | Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes)

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.81%

5 Years

rr_AverageAnnualReturnYear05

3.23%

10 Years

rr_AverageAnnualReturnYear10

10.32%

[1] Historical performance for A, C and R Classes prior to their inception is based on the performance of Investor Class shares. A, C and R Class performance has been adjusted to reflect differences in sales charges, if applicable, and expenses between classes.

[2] Prior to March 1, 2010, the A 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] Historical performance for C Class prior to its inception is based on the performance of Investor Class shares. C Class performance has been adjusted to reflect differences in sales charges, if applicable, and expenses between classes.

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

[5] Historical performance for A, C and R Classes prior to their inception is based on the performance of Investor Class shares. A, C and R Class performance has been adjusted to reflect differences in sales charges, if applicable, and expenses between classes.

[6] 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.

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

XML

ALL CAP GROWTH 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 12 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 ALL CAP GROWTH FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	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
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none

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

Annual Fund Operating Expenses ALL CAP GROWTH FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Management Fee	1.00%	0.80%	1.00%	1.00%	1.00%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Other Expenses	none	none	none	none	none
Total Annual Fund Operating Expenses	1.00%	0.80%	1.25%	2.00%	1.50%

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 ALL CAP GROWTH FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	102	319	553	1,225
INSTITUTIONAL CLASS	82	256	445	990
A CLASS	695	949	1,223	1,999
C CLASS	203	628	1,079	2,324
R CLASS	153	475	819	1,789

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 55% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers look for stocks of companies of all sizes 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 and revenues. The portfolio managers’ principal analytical technique involves the identification of companies with earnings and revenues that are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. In addition to accelerating growth, the fund also considers companies demonstrating price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Principal Risks

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

• Small and Mid Cap Stocks — The fund invests in mid-sized and smaller companies, which may be more volatile and subject to greater risk than larger companies. Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs.

• 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.

• Foreign Securities — The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

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

• 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.

• 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. 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 (1Q 2012): 18.71%

Lowest Performance Quarter (4Q 2008): -26.56%

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

Average Annual Total Returns ALL CAP GROWTH FUND	1 Year	5 Years		10 Years		Since Inception	Inception Date
INVESTOR CLASS	15.71%	(0.12%)		10.31%			Nov. 25, 1983
INVESTOR CLASS After Taxes on Distributions	14.51%	(0.42%)		10.15%			Nov. 25, 1983
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares	11.84%	(0.11%)		9.22%			Nov. 25, 1983
INSTITUTIONAL CLASS	15.96%					19.25%	Sep. 30, 2011
A CLASS	8.80%	(1.54%)	[1]	9.39%	[1]		Sep. 30, 2011
C CLASS	14.60%	(1.12%)	[1]	9.21%	[1]		Sep. 30, 2011
R CLASS	15.16%	(0.62%)	[1]	9.76%	[1]		Sep. 30, 2011
Russell 3000® Growth Index (reflects no deduction for fees, expenses or taxes)	15.21%	3.15%		7.69%

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.

BALANCED FUND

RISK/RETURN

Investment Objective

The fund seeks long-term capital growth and current income by investing approximately 60% of its assets in equity securities and the remainder in bonds and other fixed-income securities.

Fees and Expenses

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

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees BALANCED FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none

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

Annual Fund Operating Expenses BALANCED FUND	INVESTOR CLASS	INSTITUTIONAL CLASS
Management Fee	0.90%	0.70%
Distribution and Service (12b-1) Fees	none	none
Other Expenses	0.01%	0.01%
Total Annual Fund Operating Expenses	0.91%	0.71%

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 BALANCED FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	93	291	504	1,120
INSTITUTIONAL CLASS	73	227	396	883

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 82% of the average value of its portfolio.

Principal Investment Strategies

For the equity portion of Balanced, the portfolio managers select stocks using quantitative management techniques in a two-step process. First, the managers rank stocks, primarily those of large (those with a market cap greater than $2 billion), publicly-traded U.S. companies from most attractive to least attractive based on each stock’s value as well as its growth potential. Second, the portfolio managers use a quantitative model to build a portfolio of stocks from the ranking described above that they believe will provide the optimal balance between risk and expected return. 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.

For the fixed-income portion of the fund, the portfolio managers invest in a diversified portfolio of high- and medium-grade non-money market debt securities. These securities, which may be payable in U.S. or foreign currencies, may include corporate bonds and notes, government securities and securities backed by mortgages or other assets. Shorter-term debt securities round out the portfolio.

Principal Risks

• Style Risk — If at any time the market is not favoring the quantitative investment style used to manage the fund’s equity portion, that portion’s gains may not be as big as, or its losses may be bigger than, those of other equity funds using different investment styles.

• Investment Process 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 models will result in effective investment decisions for the fund. Additionally, the commonality of portfolio holdings across quantitative investment managers may amplify losses.

• Benchmark Correlation — The performance of the fund's equity portion will be tied to the performance of the S&P 500 Index. If the S&P 500 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.

• Interest Rate Risk — Investments in debt securities are sensitive to interest rate changes. Generally, the value of debt securities and the funds that hold them decline as interest rates rise. The fund’s fixed-income investments are designed to reduce this risk. Interest rate risk, however, is generally higher for the fixed-income portion of Balanced than for funds that have shorter-weighted maturities, such as money market funds and short-term bond funds.

• Credit Risk — Debt securities, even investment-grade debt securities, are subject to credit risk. Credit risk is the risk that the inability or perceived inability of the issuer to make interest and principal payments will cause the value of the securities to decrease. As a result the fund’s share price could also decrease. Changes in the credit rating of a debt security held by the fund could have a similar effect.

• Prepayment Risk — The fund may invest in debt securities backed by mortgages or other assets. If these underlying assets are prepaid, the fund may benefit less from declining interest rates than funds of similar maturity that invest less heavily in mortgage- and asset-backed securities.

• Foreign Securities Risk — Foreign securities have certain unique risks, such as currency risk, social, political and economic risk, and foreign market and trading risk. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• Derivative Risk — The use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional instruments. Derivatives are subject to a number of risks, including liquidity, interest rate, market, credit and correlation risk.

• Liquidity Risk — The fund may also be subject to liquidity risk. During periods of market turbulence or unusually low trading activity, in order to meet redemptions it may be necessary for the fund to sell securities at prices that could have an adverse effect on the fund’s share price.

• 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. 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.

The blended index is considered the benchmark for Balanced. It combines two widely known indices in proportion to the asset mix of the fund. Accordingly, 60% of the index is represented by the S&P 500 Index, which reflects the approximately 60% of the fund’s assets invested in stocks. The blended index’s remaining 40% is represented by the Barclays U.S. Aggregate Bond Index, which reflects the roughly 40% of the fund’s assets invested in fixed-income securities.

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): 10.48%

Lowest Performance Quarter (4Q 2008): -12.18%

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

Average Annual Total Returns BALANCED FUND	1 Year	5 Years	10 Years
INVESTOR CLASS	11.59%	4.00%	6.76%
INVESTOR CLASS After Taxes on Distributions	10.72%	3.42%	5.92%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares	8.44%	3.21%	5.61%
INSTITUTIONAL CLASS	11.94%	4.22%	6.98%
S&P 500® Index (reflects no deduction for fees, expenses or taxes)	16.00%	1.66%	7.10%
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)	4.21%	5.95%	5.18%
Blended Index (reflects no deduction for fees, expenses or taxes)	11.31%	3.81%	6.62%

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.

CAPITAL 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 12 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 CAPITAL VALUE FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none

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

Annual Fund Operating Expenses CAPITAL VALUE FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS
Management Fee	1.10%	0.90%	1.10%
Distribution and Service (12b-1) Fees	none	none	0.25%
Other Expenses	none	none	none
Total Annual Fund Operating Expenses	1.10%	0.90%	1.35%

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 CAPITAL VALUE 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

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 32% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers use a value investment strategy that invests primarily in stocks of medium to large companies that the portfolio managers believe are undervalued at the time of purchase. In selecting stocks, the portfolio managers look for companies that are temporarily out of favor in, or whose value is not yet recognized by, the market. To identify these companies, the portfolio managers look for companies with earnings, cash flows and/or assets that may not be reflected accurately in the companies’ stock prices.

The portfolio managers also attempt to minimize taxable distributions to fund shareholders.  The fund’s tax-sensitive techniques may, from time to time, be inconsistent with the fund’s objective of long-term capital growth. Since the fund focuses on after-tax returns, it may not provide as high a pre-tax return relative to other funds.

The portfolio managers may elect to sell a security, even if the sale results in a taxable gain, if they determine that the tax impact of the sale is outweighed by other factors. Such factors include the investment risk of holding the security or the availability of a replacement security that has a better potential return.

Principal Risks

• Value Investing – If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund’s shares may decline, even if stock prices generally are rising.

• Tax Risk – While the fund seeks to minimize taxable distributions to shareholders, it nonetheless may realize capital gains on the sale of investment securities and earn dividend income.  Federal tax laws require the fund to make distributions of such gains and income to its shareholders.  Distributions may be taxable as ordinary income, capital gains, or a combination of the two.

• 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. 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): 17.67%

Lowest Performance Quarter (4Q 2008): -20.69%

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

Average Annual Total Returns CAPITAL VALUE FUND		1 Year	5 Years	10 Years	Since Inception	Inception Date
INVESTOR CLASS		16.38%	(0.37%)	5.81%		Mar. 31, 1999
INVESTOR CLASS After Taxes on Distributions		16.08%	(0.68%)	5.44%		Mar. 31, 1999
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		11.06%	(0.37%)	5.07%		Mar. 31, 1999
INSTITUTIONAL CLASS		16.61%	(0.17%)	6.02%		Mar. 01, 2002
A CLASS	[1]	9.54%	(1.77%)		4.59%	May 14, 2003
Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes)		17.51%	0.59%	7.38%

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.

FOCUSED GROWTH 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 11 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 FOCUSED GROWTH FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	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
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none

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

Annual Fund Operating Expenses FOCUSED GROWTH FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Management Fee	1.00%	0.80%	1.00%	1.00%	1.00%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Other Expenses	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	1.01%	0.81%	1.26%	2.01%	1.51%

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 FOCUSED GROWTH FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	103	322	559	1,236
INSTITUTIONAL CLASS	83	259	450	1,002
A CLASS	696	952	1,228	2,010
C CLASS	204	632	1,084	2,334
R CLASS	154	478	824	1,800

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 59% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers look for stocks of companies they believe will increase in value over time. 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 larger-sized companies that meet their investment criteria. Under normal market conditions, the fund’s portfolio will primarily consist of securities of companies demonstrating business improvement. Analytical indicators helping to identify signs of business improvement could include accelerating earnings or revenue growth rates, increasing cash flows, or other indications of the relative strength of a company’s business. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Principal Risks

• 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.

• Foreign Securities — The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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 (1Q 2012): 16.60%

Lowest Performance Quarter (4Q 2008): -21.00%

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

Average Annual Total Returns FOCUSED GROWTH FUND	1 Year	5 Years	Since Inception	Inception Date
INVESTOR CLASS	15.50%	2.03%	4.90%	Feb. 28, 2005
INVESTOR CLASS After Taxes on Distributions	15.38%	1.95%	4.30%	Feb. 28, 2005
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares	10.23%	1.72%	3.96%	Feb. 28, 2005
INSTITUTIONAL CLASS	15.78%	2.24%	2.43%	Sep. 28, 2007
A CLASS	8.66%	0.60%	0.85%	Sep. 28, 2007
C CLASS	14.43%	1.03%	1.22%	Sep. 28, 2007
R CLASS	14.97%	1.51%	1.72%	Sep. 28, 2007
Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)	15.26%	3.12%	5.60%	Feb. 28, 2005

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.

FUNDAMENTAL EQUITY FUND

RISK/RETURN

Investment Objective

The fund seeks long-term capital growth.

Income is a secondary objective.

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. The fund’s B Class shares are not available for purchase, except through exchanges and dividend reinvestments.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees FUNDAMENTAL EQUITY FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	B CLASS	C CLASS	R 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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)	none	none	none	5.00%	1.00%	none
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none	none

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

Annual Fund Operating Expenses FUNDAMENTAL EQUITY FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	B CLASS	C CLASS	R CLASS
Management Fee	1.00%	0.80%	1.00%	1.00%	1.00%	1.00%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	1.00%	0.50%
Other Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	1.01%	0.81%	1.26%	2.01%	2.01%	1.51%

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 (unless otherwise indicated), 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 FUNDAMENTAL EQUITY FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	103	322	559	1,236
INSTITUTIONAL CLASS	83	259	450	1,002
A CLASS	696	952	1,228	2,010
B CLASS	604	932	1,184	2,142
C CLASS	204	632	1,084	2,334
R CLASS	154	478	824	1,800

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
FUNDAMENTAL EQUITY FUND B CLASS	204	632	1,084	2,142

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 18% of the average value of its portfolio.

Principal Investment Strategies

The fund will generally invest in larger-sized companies using a quantitative model that combines fundamental measures of a stock’s value and growth potential. To measure value, the managers may use ratios of stock price-to-earnings and stock price-to-cash flow, among others. To measure growth, the managers may use the rate of growth of a company’s earnings and cash flow and changes in its earnings estimates, as well as other factors. The model also considers price momentum. The portfolio managers attempt to build a portfolio of stocks that provides better returns than, and a dividend yield comparable to, the S&P 500® Index, without taking on significant additional risk.

Under normal market conditions, the fund will invest at least 80% of its assets in equity securities.

When determining whether to sell a security, the portfolio managers consider among other things, a security’s price, whether a security’s risk parameters outweigh its return opportunities, general market conditions and any other factor deemed relevant by the portfolio managers.

Principal Risks

• Style Risk –If at any time the market is not favoring the fund’s investment process, 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.

• Benchmark Correlation – The fund’s performance will be tied to the performance of its benchmark, the S&P 500® Index. If the fund’s benchmark goes down, it is likely that the fund’s performance will go down.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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.

• 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. 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 (3Q 2009): 15.47%

Lowest Performance Quarter (4Q 2008): -20.53%

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

Average Annual Total Returns FUNDAMENTAL EQUITY FUND	1 Year	5 Years	Since Inception	Inception Date
INVESTOR CLASS	15.24%	1.51%	6.32%	Jul. 29, 2005
INSTITUTIONAL CLASS	15.46%	1.72%	6.53%	Jul. 29, 2005
A CLASS	8.42%	0.08%	5.88%	Nov. 30, 2004
A CLASS After Taxes on Distributions	8.22%	(0.08%)	5.49%	Nov. 30, 2004
A CLASS After Taxes on Distributions and Sale of Fund Shares	5.74%	0.04%	4.96%	Nov. 30, 2004
B CLASS	10.10%	0.31%	5.85%	Nov. 30, 2004
C CLASS	14.18%	0.50%	5.86%	Nov. 30, 2004
R CLASS	14.72%	1.00%	5.78%	Jul. 29, 2005
S&P 500® Index (reflects no deduction for fees, expenses or taxes)	16.00%	1.66%	4.61%	Nov. 30, 2004

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.

GROWTH 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 12 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 GROWTH FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	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
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none

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

Annual Fund Operating Expenses GROWTH FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Management Fee	0.97%	0.77%	0.97%	0.97%	0.97%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Other Expenses	none	none	none	none	none
Total Annual Fund Operating Expenses	0.97%	0.77%	1.22%	1.97%	1.47%

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 GROWTH FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	99	310	537	1,190
INSTITUTIONAL CLASS	79	246	428	955
A CLASS	692	941	1,207	1,967
C CLASS	200	619	1,063	2,293
R CLASS	150	466	803	1,756

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 74% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers look for stocks of companies they believe will increase in value over time. 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 larger-sized companies that meet their investment criteria. Under normal market conditions, the fund’s portfolio will primarily consist of securities of companies demonstrating business improvement. Analytical indicators helping to identify signs of business improvement could include accelerating earnings or revenue growth rates, increasing cash flows, or other indications of the relative strength of a company’s business. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Principal Risks

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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 (1Q 2012): 15.91%

Lowest Performance Quarter (4Q 2008): -22.91%

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

Average Annual Total Returns GROWTH FUND		1 Year	5 Years		10 Years		Since Inception	Inception Date
INVESTOR CLASS		13.91%	2.26%		7.48%			Jun. 30, 1971
INVESTOR CLASS After Taxes on Distributions		13.23%	1.98%		7.32%			Jun. 30, 1971
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		9.96%	1.91%		6.61%			Jun. 30, 1971
INSTITUTIONAL CLASS		14.14%	2.46%		7.69%			Jun. 16, 1997
A CLASS	[1]	7.08%	0.80%		6.59%			Jun. 04, 1997
C CLASS		12.79%	1.24%	[2]	6.42%	[2]		Mar. 01, 2010
R CLASS		13.33%	1.75%				5.91%	Aug. 29, 2003
Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)		15.26%	3.12%		7.52%

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.

HERITAGE 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 purchase 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. The fund’s B Class shares are not available for purchase, except through exchanges and dividend reinvestments.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees HERITAGE FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	B CLASS	C CLASS	R 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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)	none	none	none	5.00%	1.00%	none
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none	none

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

Annual Fund Operating Expenses HERITAGE FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	B CLASS	C CLASS	R CLASS
Management Fee	1.00%	0.80%	1.00%	1.00%	1.00%	1.00%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	1.00%	0.50%
Other Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	1.01%	0.81%	1.26%	2.01%	2.01%	1.51%

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 (unless otherwise indicated), 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 HERITAGE FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	103	322	559	1,236
INSTITUTIONAL CLASS	83	259	450	1,002
A CLASS	696	952	1,228	2,010
B CLASS	604	932	1,184	2,142
C CLASS	204	632	1,084	2,334
R CLASS	154	478	824	1,800

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
HERITAGE FUND B CLASS	204	632	1,084	2,142

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 72% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers look for stocks of medium-sized and smaller 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 and revenues. The portfolio managers’ principal analytical technique involves the identification of companies with earnings and revenues that are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. In addition to accelerating growth, the fund also considers companies demonstrating price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Principal Risks

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

• Mid Cap Stocks – The fund invests in mid-sized and smaller companies, which may be more volatile and subject to greater risk than larger companies. Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs.

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

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

• 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.

• 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. 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 (3Q 2010): 18.36%

Lowest Performance Quarter (4Q 2008): -26.63%

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

Average Annual Total Returns HERITAGE FUND		1 Year	5 Years	10 Years	Since Inception	Inception Date
INVESTOR CLASS		16.04%	0.97%	11.03%		Nov. 10, 1987
INVESTOR CLASS After Taxes on Distributions		15.68%	0.87%	10.78%		Nov. 10, 1987
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		10.90%	0.81%	9.84%		Nov. 10, 1987
INSTITUTIONAL CLASS		16.26%	1.18%	11.25%		Jun. 16, 1997
A CLASS	[1]	9.13%	(0.46%)	10.10%		Jul. 11, 1997
B CLASS		10.94%	(0.23%)		1.03%	Sep. 28, 2007
C CLASS		14.88%	(0.03%)	9.94%		Jun. 26, 2001
R CLASS		15.47%	0.47%		1.71%	Sep. 28, 2007
Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes)		15.81%	3.23%	10.32%

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.

NEW OPPORTUNITIES 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 12 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 NEW OPPORTUNITIES FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	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
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%
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none

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

Annual Fund Operating Expenses NEW OPPORTUNITIES FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Management Fee	1.50%	1.30%	1.50%	1.50%	1.50%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Other Expenses	none	none	none	none	none
Acquired Fund Fees and Expenses	0.03%	0.03%	0.03%	0.03%	0.03%
Total Annual Fund Operating Expenses	1.53%	1.33%	1.78%	2.53%	2.03%

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 NEW OPPORTUNITIES FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	156	484	835	1,822
INSTITUTIONAL CLASS	136	422	730	1,601
A CLASS	746	1,104	1,485	2,547
C CLASS	257	789	1,346	2,860
R CLASS	207	638	1,094	2,355

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 63% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers look for stocks of small and mid-sized 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 and revenues. The portfolio managers’ principal analytical technique involves the identification of companies with earnings and revenues that are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. In addition to accelerating growth, the fund also may consider companies whose stocks demonstrate price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Principal Risks

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

• Small and Mid Cap Stocks – The smaller and medium-sized companies in which the fund invests may be more volatile and subject to greater risk than larger companies. Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs.

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• IPO Risk – The fund’s performance may be affected by investments in initial public offerings.

• 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. 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 (3Q 2009): 19.10%

Lowest Performance Quarter (4Q 2008): -25.16%

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

Average Annual Total Returns NEW OPPORTUNITIES FUND	1 Year	5 Years		10 Years		Since Inception	Inception Date
INVESTOR CLASS	14.50%	0.63%		7.47%			Dec. 26, 1996
INVESTOR CLASS After Taxes on Distributions	14.50%	0.63%		7.47%			Dec. 26, 1996
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares	9.43%	0.54%		6.61%			Dec. 26, 1996
INSTITUTIONAL CLASS	14.73%					12.17%	Mar. 01, 2010
A CLASS	7.78%	(0.80%)	[1]	6.58%	[1]		Mar. 01, 2010
C CLASS	13.39%	(0.39%)	[1]	6.40%	[1]		Mar. 01, 2010
R CLASS	13.95%	0.12%	[1]	6.93%	[1]		Mar. 01, 2010
Russell 2500® Growth Index (reflects no deduction for fees, expenses or taxes)	16.13%	4.07%		10.55%

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.

NT GROWTH 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.

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

Annual Fund Operating Expenses	NT GROWTH FUND INSTITUTIONAL CLASS
Management Fee	0.77%
Distribution and Service (12b-1) Fees	none
Other Expenses	none
Total Annual Fund Operating Expenses	0.77%

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 (USD $)	1 Year	3 Years	5 Years	10 Years
NT GROWTH FUND INSTITUTIONAL CLASS	79	246	428	955

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 87% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers look for stocks of companies they believe will increase in value over time. 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 larger-sized companies that meet their investment criteria. Under normal market conditions, the fund’s portfolio will primarily consist of securities of companies demonstrating business improvement. Analytical indicators helping to identify signs of business improvement could include accelerating earnings or revenue growth rates, increasing cash flows, or other indications of the relative strength of a company’s business. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

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

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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): 15.77%

Lowest Performance Quarter (4Q 2008): -22.96%

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

Average Annual Total Returns NT GROWTH FUND	1 Year	5 Years	Since Inception	Inception Date
INSTITUTIONAL CLASS	13.84%	2.48%	5.64%	May 12, 2006
INSTITUTIONAL CLASS After Taxes on Distributions	13.19%	2.21%	5.25%	May 12, 2006
INSTITUTIONAL CLASS After Taxes on Distributions and Sale of Fund Shares	9.89%	2.10%	4.80%	May 12, 2006
Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)	15.26%	3.12%	4.97%	Apr. 30, 2006

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 VISTA 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.

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

Annual Fund Operating Expenses	NT VISTA FUND INSTITUTIONAL CLASS
Management Fee	0.80%
Distribution and Service (12b-1) Fees	none
Other Expenses	0.01%
Total Annual Fund Operating Expenses	0.81%

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 (USD $)	1 Year	3 Years	5 Years	10 Years
NT VISTA FUND INSTITUTIONAL CLASS	83	259	450	1,002

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 92% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers primarily look for stocks of medium-sized and smaller 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 and revenues. The portfolio managers’ principal analytical technique involves the identification of companies with earnings and revenues that are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. In addition to accelerating growth, the fund also considers companies demonstrating price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

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

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

• Mid Cap Stocks –  The fund invests in mid-sized and smaller companies, which may be more volatile and subject to greater risk than larger companies. Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs.

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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 (1Q 2012): 16.67%

Lowest Performance Quarter (4Q 2008): -25.63%

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

Average Annual Total Returns NT VISTA FUND	1 Year	5 Years	Since Inception	Inception Date
INSTITUTIONAL CLASS	15.58%	(3.25%)	1.58%	May 12, 2006
INSTITUTIONAL CLASS After Taxes on Distributions	15.56%	(3.31%)	1.54%	May 12, 2006
INSTITUTIONAL CLASS After Taxes on Distributions and Sale of Fund Shares	10.17%	(2.74%)	1.35%	May 12, 2006
Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes)	15.81%	3.23%	4.46%	Apr. 30, 2006

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.

SELECT 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 12 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 SELECT FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	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
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none

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

Annual Fund Operating Expenses SELECT FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Management Fee	1.00%	0.80%	1.00%	1.00%	1.00%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Other Expenses	none	none	none	none	none
Total Annual Fund Operating Expenses	1.00%	0.80%	1.25%	2.00%	1.50%

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 SELECT FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	102	319	553	1,225
INSTITUTIONAL CLASS	82	256	445	990
A CLASS	695	949	1,223	1,999
C CLASS	203	628	1,079	2,324
R CLASS	153	475	819	1,789

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 17% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers look for stocks of companies they believe will increase in value over time. 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 larger-sized 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. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. Among other variables, the portfolio managers will consider a company’s valuation and profitability. Other analytical techniques include evaluating stock price momentum, as well as identifying additional signs of business improvement, such as increasing cash flows, or other indications of the relative strength of a company’s business. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Principal Risks

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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 (1Q 2012): 17.25%

Lowest Performance Quarter (4Q 2008): -21.82%

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

Average Annual Total Returns SELECT FUND		1 Year	5 Years	10 Years	Since Inception	Inception Date
INVESTOR CLASS		14.74%	1.63%	5.75%		Jun. 30, 1971
INVESTOR CLASS After Taxes on Distributions		14.63%	1.55%	5.50%		Jun. 30, 1971
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		9.75%	1.38%	4.98%		Jun. 30, 1971
INSTITUTIONAL CLASS		14.97%	1.84%	5.96%		Mar. 13, 1997
A CLASS	[1]	7.89%	0.19%	4.87%		Aug. 08, 1997
C CLASS		13.62%	0.62%		5.04%	Jan. 31, 2003
R CLASS		14.20%	1.13%		3.06%	Jul. 29, 2005
Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)		15.26%	3.12%	7.52%

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.

SMALL CAP GROWTH 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. The fund’s B Class shares are not available for purchase, except through exchanges and dividend reinvestments.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees SMALL CAP GROWTH FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	B CLASS	C CLASS	R 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 original offering price for B Class shares or the lower of the original offering price or redemption proceeds for C Class shares)	none	none	none	5.00%	1.00%	none
Exchange Fee (as a percentage of Amount Redeemed)	2.00%	2.00%	none	none	none	2.00%
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none	none

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

Annual Fund Operating Expenses SMALL CAP GROWTH FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	B CLASS	C CLASS	R CLASS
Management Fee	1.42%	1.22%	1.42%	1.42%	1.42%	1.42%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	1.00%	0.50%
Other Expenses	none	none	none	none	none	none
Acquired Fund Fees and Expenses	0.04%	0.04%	0.04%	0.04%	0.04%	0.04%
Total Annual Fund Operating Expenses	1.46%	1.26%	1.71%	2.46%	2.46%	1.96%

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 (unless otherwise indicated), 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 SMALL CAP GROWTH FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	149	462	798	1,745
INSTITUTIONAL CLASS	129	400	692	1,522
A CLASS	739	1,084	1,451	2,476
B CLASS	650	1,068	1,411	2,607
C CLASS	250	768	1,311	2,791
R CLASS	199	616	1,058	2,282

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
SMALL CAP GROWTH FUND B CLASS	250	768	1,311	2,607

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 62% of the average value of its portfolio.

Principal Investment Strategies

Under normal market conditions, the fund will invest at least 80% of its assets in small cap companies. The portfolio managers consider small cap companies to include those with a market capitalization that does not exceed that of the largest company in the Russell 2000 Growth Index.

The portfolio managers look for stocks of smaller-sized 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 and revenues. The portfolio managers’ principal analytical technique involves the identification of companies with earnings and revenues that are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. In addition to accelerating growth, the fund also may consider companies whose stocks demonstrate price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Principal Risks

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

• Small Cap Stocks – The smaller companies in which the fund invests may be more volatile and subject to greater risk than larger companies.  Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs.

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• IPO Risk – The fund’s performance may be affected by investments in initial public offerings.

• 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. 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 (4Q 2003): 21.51%

Lowest Performance Quarter (3Q 2011): -25.36%

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

Average Annual Total Returns SMALL CAP GROWTH FUND	1 Year	5 Years	10 Years	Since Inception	Inception Date
INVESTOR CLASS	14.59%	0.47%	9.53%		Jun. 01, 2001
INVESTOR CLASS After Taxes on Distributions	14.56%	0.46%	9.19%		Jun. 01, 2001
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares	9.53%	0.40%	8.36%		Jun. 01, 2001
INSTITUTIONAL CLASS	14.64%	0.63%		1.90%	May 18, 2007
A CLASS	7.69%	(0.96%)		8.93%	Jan. 31, 2003
B CLASS	9.50%	(0.74%)		8.77%	Jan. 31, 2003
C CLASS	13.44%	(0.56%)		8.80%	Jan. 31, 2003
R CLASS	13.83%	(0.05%)		(0.35%)	Sep. 28, 2007
Russell 2000® Growth Index (reflects no deduction for fees, expenses or taxes)	14.59%	3.49%	9.80%

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.

ULTRA 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 12 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 ULTRA FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	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
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none

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

Annual Fund Operating Expenses ULTRA FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Management Fee	0.99%	0.79%	0.99%	0.99%	0.99%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Other Expenses	none	none	none	none	none
Total Annual Fund Operating Expenses	0.99%	0.79%	1.24%	1.99%	1.49%

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 ULTRA FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	101	316	548	1,213
INSTITUTIONAL CLASS	81	253	439	978
A CLASS	694	946	1,218	1,988
C CLASS	202	625	1,073	2,314
R CLASS	152	472	814	1,778

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 13% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers look for stocks of companies they believe will increase in value over time. 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 larger-sized 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. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. Among other variables, the portfolio managers will consider the fund’s growth and momentum profile relative to the benchmark. Other analytical techniques help identify additional signs of business improvement, such as increasing cash flows, or other indications of the relative strength of a company’s business. In addition to accelerating growth and other signs of business improvement, the fund also considers companies demonstrating price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Principal Risks

• 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.

• Foreign Securities — The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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 (1Q 2012): 15.53%

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

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

Average Annual Total Returns ULTRA FUND		1 Year	5 Years	10 Years	Since Inception	Inception Date
INVESTOR CLASS		14.18%	1.21%	5.93%		Nov. 02, 1981
INVESTOR CLASS After Taxes on Distributions		14.10%	1.16%	5.40%		Nov. 02, 1981
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		9.33%	1.02%	5.16%		Nov. 02, 1981
INSTITUTIONAL CLASS		14.39%	1.42%	6.14%		Nov. 14, 1996
A CLASS	[1]	7.33%	(0.23%)	5.05%		Oct. 02, 1996
C CLASS		13.04%	0.21%	4.89%		Oct. 29, 2001
R CLASS		13.59%	0.70%		4.03%	Aug. 29, 2003
S&P 500® Index (reflects no deduction for fees, expenses or taxes)		16.00%	1.66%	7.10%
Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)		15.26%	3.12%	7.52%

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.

VEEDOT 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.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees VEEDOT FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS
Exchange Fee (as a percentage of Amount Redeemed)	2.00%	2.00%
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none

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

Annual Fund Operating Expenses VEEDOT FUND	INVESTOR CLASS	INSTITUTIONAL CLASS
Management Fee	1.25%	1.05%
Distribution and Service (12b-1) Fees	none	none
Other Expenses	0.01%	0.01%
Total Annual Fund Operating Expenses	1.26%	1.06%

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 VEEDOT FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	129	400	692	1,522
INSTITUTIONAL CLASS	108	338	585	1,294

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 257% of the average value of its portfolio.

Principal Investment Strategies

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 an approach to common stock investing that relies heavily on quantitative tools to identify companies, regardless of size, industry type or geographic location, whose share price patterns suggest their stocks are likely to increase in value. This technical analysis is particularly oriented to identifying attractive price patterns for companies whose earnings and revenues are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. These companies would be candidates for purchase. Conversely, companies whose share price patterns suggest a likely decline in price would be candidates for sale, if owned by the fund. On occasion, the process may look favorably on a company whose share price pattern appears attractive even though the company looks less attractive based on the growth screen.

The process driving the fund is specifically designed to respond quickly to changing stock market conditions. As a result, the fund’s portfolio turnover, perhaps as much as 200-400% per year or more, may be significantly higher than that of many other funds.

Principal Risks

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

• Investment Process – There is also risk associated with reliance on the fund’s computer-based investment process. If the investment style embedded in this process falls out of favor with the market, the fund’s performance may suffer.

• Nondiversification – The fund is classified as nondiversified. This gives the portfolio managers the flexibility to hold large positions in a small number of securities. If so, a price change in any one of those securities may have a greater impact on the fund’s share prices than would be the case in a diversified fund.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.  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.

• 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. 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): 20.74%

Lowest Performance Quarter (3Q 2008): -25.25%

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

Average Annual Total Returns VEEDOT FUND	1 Year	5 Years	10 Years
INVESTOR CLASS	11.31%	(3.46%)	6.96%
INVESTOR CLASS After Taxes on Distributions	11.00%	(3.58%)	6.89%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares	7.77%	(2.93%)	6.14%
INSTITUTIONAL CLASS	11.49%	(3.28%)	7.16%
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)	16.42%	2.04%	7.68%

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.

VISTA 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 VISTA FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	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
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none

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

Annual Fund Operating Expenses VISTA FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Management Fee	1.00%	0.80%	1.00%	1.00%	1.00%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Other Expenses	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	1.01%	0.81%	1.26%	2.01%	1.51%

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 VISTA FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	103	322	559	1,236
INSTITUTIONAL CLASS	83	259	450	1,002
A CLASS	696	952	1,228	2,010
C CLASS	204	632	1,084	2,334
R CLASS	154	478	824	1,800

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 71% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers primarily look for stocks of medium-sized and smaller 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 and revenues. The portfolio managers’ principal analytical technique involves the identification of companies with earnings and revenues that are not only growing, but growing at an accelerating pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate. In addition to accelerating growth, the fund also considers companies demonstrating price strength relative to their peers. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Principal Risks

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

• Mid Cap Stocks – The fund invests in mid-sized and smaller companies, which may be more volatile and subject to greater risk than larger companies. Smaller companies may have limited financial resources, product lines and markets, and their securities may trade less frequently and in more limited volumes than the securities of larger companies, which could lead to higher transaction costs.

• 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.

• Foreign Securities – The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities.

• 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. 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): 18.32%

Lowest Performance Quarter (4Q 2008): -26.05%

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

Average Annual Total Returns VISTA FUND		1 Year	5 Years		10 Years		Since Inception	Inception Date
INVESTOR CLASS		15.48%	(3.82%)		8.40%			Nov. 25, 1983
INVESTOR CLASS After Taxes on Distributions		15.48%	(3.82%)		8.18%			Nov. 25, 1983
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		10.07%	(3.21%)		7.43%			Nov. 25, 1983
INSTITUTIONAL CLASS		15.72%	(3.62%)		8.61%			Nov. 14, 1996
A CLASS	[1]	8.57%	(5.17%)		7.49%			Oct. 02, 1996
C CLASS		14.30%	(4.77%)	[2]	7.33%	[2]		Mar. 01, 2010
R CLASS		14.85%	(4.30%)				2.92%	Jul. 29, 2005
Russell Midcap® Growth Index (reflects no deduction for fees, expenses or taxes)		15.81%	3.23%		10.32%

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.

[1] Historical performance for A, C and R Classes prior to their inception is based on the performance of Investor Class shares. A, C and R Class performance has been adjusted to reflect differences in sales charges, if applicable, and expenses between classes.

[1] Prior to March 1, 2010, the A 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 March 1, 2010, the A 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.

[2] Historical performance for C Class prior to its inception is based on the performance of Investor Class shares. C Class performance has been adjusted to reflect differences in sales charges, if applicable, and expenses between classes.

[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 has been restated to reflect this change.

[1] Historical performance for A, C and R Classes prior to their inception is based on the performance of Investor Class shares. A, C and R Class performance has been adjusted to reflect differences in sales charges, if applicable, and expenses between classes.

[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 has been restated to reflect this charge.

[1] Prior to March 1, 2010, the A 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.

[2] Historical performance for C Class prior to its inception is based on the performance of Investor Class shares. C Class performance has been adjusted to reflect differences in sales charges, if applicable, and expenses between classes.