485BPOS

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

1933 Act File No. 33-64872

1940 Act File No. 811-7820

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549
__________________
FORM N-1A
__________________
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933		☒
Pre-Effective Amendment No.		☐
Post-Effective Amendment No. 60		☒
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940		☒
Amendment No. 60		☒
(Check appropriate box or boxes.)
__________________
American Century Capital Portfolios, Inc. (Exact Name of Registrant as Specified in Charter)
__________________
4500 MAIN STREET, KANSAS CITY, MISSOURI 64111 (Address of Principal Executive Offices)(Zip Code)
REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (816) 531-5575
CHARLES A. ETHERINGTON 4500 MAIN STREET, KANSAS CITY, MISSOURI 64111 (Name and Address of Agent for Service)
It is proposed that this filing will become effective (check appropriate box)
☑	immediately upon filing pursuant to paragraph (b)
☐	on (date) pursuant to paragraph (b)
☐	60 days after filing pursuant to paragraph (a)(1)
☐	on (date) pursuant to paragraph (a)(1)
☐	75 days after filing pursuant to paragraph (a)(2)
☐	on (date) pursuant to paragraph (a)(2) of rule 485.
If appropriate, check the following box:
☐	this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

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

American Century Capital Portfolios, Inc.  

(Registrant)

         *

By:   ____________________________________

         Jonathan S. Thomas

         President

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

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

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

*By:        /s/ Ryan Blaine

____________________________________

Ryan Blaine

Attorney in Fact

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

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

EXHIBIT INDEX

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

XML

Label

Element

Value

Prospectus [Line Items]

rr_ProspectusLineItems

Document Type

dei_DocumentType

485BPOS

Document Period End Date

dei_DocumentPeriodEndDate

Mar. 31, 2013

Registrant Name

dei_EntityRegistrantName

AMERICAN CENTURY CAPITAL PORTFOLIOS INC

Central Index Key

dei_EntityCentralIndexKey

0000908186

Amendment Flag

dei_AmendmentFlag

false

Trading Symbol

dei_TradingSymbol

ACCP

Document Creation Date

dei_DocumentCreationDate

Jul. 25, 2013

Document Effective Date

dei_DocumentEffectiveDate

Jul. 26, 2013

Prospectus Date

rr_ProspectusDate

Jul. 26, 2013

EQUITY INCOME FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

EQUITY INCOME FUND

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks current income.

Objective, Secondary [Text Block]

rr_ObjectiveSecondaryTextBlock

Capital appreciation 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 83% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

83.00%

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

The portfolio managers look for equity securities of companies with a favorable income-paying history that have prospects for income payments to continue or increase. The portfolio managers also look for equity securities of companies that they believe are undervalued and have the potential for an increase in price. To identify these undervalued companies, the portfolio managers look for companies with earnings, cash flows and/or assets that may not be reflected in the companies' stock prices or may be outside the companies' historical ranges.

The fund may invest a portion of its assets in foreign securities when these securities meet the portfolio managers' standards of selection.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Discontinuance of Dividend Payments - If the stocks purchased by the fund do not continue dividend payments, the value of the fund's shares may decline, even if stock prices generally are rising.

• Style Risk - If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may decline, even if stock prices generally are rising.

• Convertible Securities Risk - The fund invests in convertible securities, which may be affected by changes in interest rates, the credit of the issuer and the value of the underlying common stock. In addition, because these securities are convertible into common stock, they are subject to general stock market risk, though to a lesser degree.

• Foreign Securities - The fund may invest in foreign securities, which can be riskier than investing in 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 Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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): 13.63%

Lowest Performance Quarter (4Q 2008): -11.31%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 11.77%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

11.77%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

13.63%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(11.31%)

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.

EQUITY INCOME FUND | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

0.93%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.94%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

96

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

300

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

521

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,155

Annual Return 2003

rr_AnnualReturn2003

24.25%

Annual Return 2004

rr_AnnualReturn2004

12.53%

Annual Return 2005

rr_AnnualReturn2005

2.46%

Annual Return 2006

rr_AnnualReturn2006

19.45%

Annual Return 2007

rr_AnnualReturn2007

1.79%

Annual Return 2008

rr_AnnualReturn2008

(20.05%)

Annual Return 2009

rr_AnnualReturn2009

12.23%

Annual Return 2010

rr_AnnualReturn2010

13.29%

Annual Return 2011

rr_AnnualReturn2011

3.57%

Annual Return 2012

rr_AnnualReturn2012

11.51%

1 Year

rr_AverageAnnualReturnYear01

11.51%

5 Years

rr_AverageAnnualReturnYear05

3.26%

10 Years

rr_AverageAnnualReturnYear10

7.41%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 01, 1994

EQUITY INCOME FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.73%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.74%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

76

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

237

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

412

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

919

1 Year

rr_AverageAnnualReturnYear01

11.57%

5 Years

rr_AverageAnnualReturnYear05

3.46%

10 Years

rr_AverageAnnualReturnYear10

7.62%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 08, 1998

EQUITY INCOME FUND | A CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.93%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.19%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

690

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

932

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,192

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,935

1 Year

rr_AverageAnnualReturnYear01

4.89%

^[1]

5 Years

rr_AverageAnnualReturnYear05

1.78%

^[1]

10 Years

rr_AverageAnnualReturnYear10

6.51%

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 07, 1997

^[1]

EQUITY INCOME FUND | B CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

5.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.93%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.94%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

597

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

910

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,148

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,068

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

197

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

610

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,048

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,068

1 Year

rr_AverageAnnualReturnYear01

6.25%

5 Years

rr_AverageAnnualReturnYear05

2.07%

Since Inception

rr_AverageAnnualReturnSinceInception

1.07%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

EQUITY INCOME FUND | C CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.93%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.94%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

197

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

610

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,048

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,261

1 Year

rr_AverageAnnualReturnYear01

10.26%

5 Years

rr_AverageAnnualReturnYear05

2.23%

10 Years

rr_AverageAnnualReturnYear10

6.35%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 13, 2001

EQUITY INCOME FUND | R CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.93%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.44%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

147

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

456

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

788

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,723

1 Year

rr_AverageAnnualReturnYear01

10.84%

5 Years

rr_AverageAnnualReturnYear05

2.75%

Since Inception

rr_AverageAnnualReturnSinceInception

6.12%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 29, 2003

EQUITY INCOME FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.58%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.59%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

60

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

189

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

330

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

738

EQUITY INCOME FUND | Return After Taxes on Distributions | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

10.91%

5 Years

rr_AverageAnnualReturnYear05

2.73%

10 Years

rr_AverageAnnualReturnYear10

6.26%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 01, 1994

EQUITY INCOME FUND | Return After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

8.25%

5 Years

rr_AverageAnnualReturnYear05

2.68%

10 Years

rr_AverageAnnualReturnYear10

6.08%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 01, 1994

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

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

17.55%

5 Years

rr_AverageAnnualReturnYear05

0.83%

10 Years

rr_AverageAnnualReturnYear10

7.54%

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

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

16.00%

5 Years

rr_AverageAnnualReturnYear05

1.66%

10 Years

rr_AverageAnnualReturnYear10

7.10%

LARGE COMPANY VALUE FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

LARGE COMPANY VALUE FUND

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 12 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 33% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

33.00%

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. 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 invests primarily in larger companies. Under normal market conditions, the portfolio managers will invest at least 80% of the fund's assets in equity securities of companies comprising the Russell 1000^® Index.

In selecting stocks for the fund, the portfolio managers look for companies whose stock price may not adequately reflect the company's value. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation criteria.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Style Risk - If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may decline, even if stock prices generally are rising.

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

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

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

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

Risk Lose Money [Text]

rr_RiskLoseMoney

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

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Fund Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

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

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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): 17.47%

Lowest Performance Quarter (4Q 2008): -21.26%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 15.99%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

15.99%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

17.47%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.26%)

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.

LARGE COMPANY VALUE FUND | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

0.87%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.87%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

89

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

278

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

483

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,073

Annual Return 2003

rr_AnnualReturn2003

28.97%

Annual Return 2004

rr_AnnualReturn2004

14.28%

Annual Return 2005

rr_AnnualReturn2005

4.17%

Annual Return 2006

rr_AnnualReturn2006

19.81%

Annual Return 2007

rr_AnnualReturn2007

(0.95%)

Annual Return 2008

rr_AnnualReturn2008

(37.38%)

Annual Return 2009

rr_AnnualReturn2009

20.69%

Annual Return 2010

rr_AnnualReturn2010

10.93%

Annual Return 2011

rr_AnnualReturn2011

1.48%

Annual Return 2012

rr_AnnualReturn2012

16.41%

1 Year

rr_AverageAnnualReturnYear01

16.41%

5 Years

rr_AverageAnnualReturnYear05

(0.19%)

10 Years

rr_AverageAnnualReturnYear10

6.08%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 30, 1999

LARGE COMPANY VALUE FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.67%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.67%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

69

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

215

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

374

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

835

1 Year

rr_AverageAnnualReturnYear01

16.64%

5 Years

rr_AverageAnnualReturnYear05

0.01%

10 Years

rr_AverageAnnualReturnYear10

6.29%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 10, 2001

LARGE COMPANY VALUE FUND | A CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.87%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.12%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

683

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

911

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,157

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,860

1 Year

rr_AverageAnnualReturnYear01

9.74%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(1.62%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

5.18%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 26, 2000

^[2]

LARGE COMPANY VALUE FUND | B CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

5.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.87%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.87%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

590

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

889

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,112

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,993

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

190

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

589

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,012

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,993

1 Year

rr_AverageAnnualReturnYear01

11.42%

5 Years

rr_AverageAnnualReturnYear05

(1.39%)

Since Inception

rr_AverageAnnualReturnSinceInception

5.34%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jan. 31, 2003

LARGE COMPANY VALUE FUND | C CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.87%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.87%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

190

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

589

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,012

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,188

1 Year

rr_AverageAnnualReturnYear01

15.27%

5 Years

rr_AverageAnnualReturnYear05

(1.18%)

10 Years

rr_AverageAnnualReturnYear10

5.02%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 07, 2001

LARGE COMPANY VALUE FUND | R CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.87%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.37%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

140

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

435

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

751

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,645

1 Year

rr_AverageAnnualReturnYear01

15.84%

5 Years

rr_AverageAnnualReturnYear05

(0.69%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.47%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 29, 2003

LARGE COMPANY VALUE FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.52%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.52%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

53

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

167

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

291

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

653

LARGE COMPANY VALUE FUND | Return After Taxes on Distributions | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

16.07%

5 Years

rr_AverageAnnualReturnYear05

(0.55%)

10 Years

rr_AverageAnnualReturnYear10

5.64%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 30, 1999

LARGE COMPANY VALUE FUND | Return After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

11.09%

5 Years

rr_AverageAnnualReturnYear05

(0.23%)

10 Years

rr_AverageAnnualReturnYear10

5.27%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 30, 1999

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

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

17.51%

5 Years

rr_AverageAnnualReturnYear05

0.59%

10 Years

rr_AverageAnnualReturnYear10

7.38%

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

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

16.00%

5 Years

rr_AverageAnnualReturnYear05

1.66%

10 Years

rr_AverageAnnualReturnYear10

7.10%

MARKET NEUTRAL VALUE FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

MARKET NEUTRAL VALUE FUND

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks long-term capital growth, independent of equity market conditions.

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 14 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 588% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

588.00%

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 14 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 to construct the portfolio for the fund. The portfolio managers buy, or take long positions in, equity securities they have identified as undervalued. They take short positions in equity securities that they have identified as overvalued. A short position arises when the fund sells a security it does not own but has borrowed in anticipation that the market price of the security will decline. To close out the short sale, the fund buys the same stock in the market and returns it to the lender. If the market price in fact declines, the fund can replace the borrowed security at a lower price and capture the value represented by the difference between the higher sale price and the lower replacement price. The fund's investment process is designed to maintain approximately equal dollar amounts invested in long and short positions at all times. By employing this market neutral strategy, the fund seeks to limit market risk (the effects of general market movements on the fund's performance). A market neutral strategy seeks to limit the fund's volatility relative to the market. As a result of this strategy, the portfolio's price movements are not expected to correlate with the market's price movements.

In selecting stocks for the fund's long portfolio, the portfolio managers look for companies of all sizes whose stock prices may not reflect the companies' values. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company. The portfolio managers use the same fundamental investment strategy to identify stocks that they believe are overvalued, which will make up the fund's short positions. In addition, the fund may take long or short positions in exchange traded funds or other securities that provide exposure to market or sector indices, underlying commodities or commodity indices the portfolio managers have identified as undervalued (for the long portfolio) or overvalued (for the short portfolio). The portfolio managers may also engage in capital structure arbitrage investment strategies.

The fund may invest a portion of its assets in foreign securities when these securities meet the portfolio managers' standards of selection.

The portfolio managers may sell stocks from the fund's long portfolio if they believe a stock no longer meets their valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects. Similarly, the portfolio managers may close out a short sale when they feel that a stock has moved closer to its fair value, and the company is no longer sufficiently overvalued to create an attractive short position.

Under normal market conditions, the fund intends to keep its assets invested primarily in U.S. equity securities. However, the fund may invest a portion of its assets in foreign securities. In addition, there may be times when the fund holds a significant portion of its assets in cash or cash equivalents.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Multi-Cap Investing - The fund is a multi-capitalization fund that invests in companies of all sizes. The small and medium-sized companies in which the fund invests may be more volatile and subject to greater risk than larger companies.

• Style Risk - If the market does not consider the individual stocks purchased for the fund's long portfolio to be undervalued and the stocks comprising the fund's short portfolio to be overvalued, the value of the fund's shares may decline, even if stock prices generally are rising.

• Failure to Maintain Market Neutrality - Though the fund seeks to limit risks associated with investing in the general equity market, external conditions may impact the fund's performance. In addition, although the portfolio managers intend to construct a market neutral portfolio, there is a risk that the portfolio managers will not construct a portfolio that limits exposure to general market movements.

• Short Sales Risk - If the price of a security increases after the fund borrows the security, the fund may suffer a loss when it replaces the borrowed security at the higher price. Any loss will be increased by the amount of compensation, interest or dividends, and transaction costs the fund must pay to a lender of the security.

• Foreign Securities - The fund may invest in foreign securities, which may be riskier than investing in 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 in its long portfolio, or in which the fund has taken a short position as well as 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

www.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 2012): 2.24%

Lowest Performance Quarter (2Q 2012): -0.39%

As of June 30, 2013, the most recent calendar quarter end, the fund's Investor Class year-to-date return was 1.28%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

1.28%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

2.24%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Jun. 30, 2012

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(0.39%)

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.

MARKET NEUTRAL VALUE FUND | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

1.90%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Dividends on Short Sales

rr_Component1OtherExpensesOverAssets

2.85%

Interest Expense for Borrowings on Short Sales

rr_Component2OtherExpensesOverAssets

0.29%

Other

rr_Component3OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

3.14%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

5.06%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.30%)

^[3]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

4.76%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

478

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,494

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

2,505

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

5,017

Annual Return 2012

rr_AnnualReturn2012

4.03%

1 Year

rr_AverageAnnualReturnYear01

4.03%

Since Inception

rr_AverageAnnualReturnSinceInception

4.32%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2011

MARKET NEUTRAL VALUE FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Dividends on Short Sales

rr_Component1OtherExpensesOverAssets

2.85%

Interest Expense for Borrowings on Short Sales

rr_Component2OtherExpensesOverAssets

0.29%

Other

rr_Component3OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

3.14%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

4.86%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.30%)

^[3]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

4.56%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

459

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,438

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

2,417

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

4,866

1 Year

rr_AverageAnnualReturnYear01

4.23%

Since Inception

rr_AverageAnnualReturnSinceInception

4.49%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2011

MARKET NEUTRAL VALUE FUND | A CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.90%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Dividends on Short Sales

rr_Component1OtherExpensesOverAssets

2.85%

Interest Expense for Borrowings on Short Sales

rr_Component2OtherExpensesOverAssets

0.29%

Other

rr_Component3OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

3.14%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

5.31%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.30%)

^[3]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

5.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

1,049

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

2,048

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

3,039

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

5,477

1 Year

rr_AverageAnnualReturnYear01

(2.17%)

Since Inception

rr_AverageAnnualReturnSinceInception

(1.07%)

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2011

MARKET NEUTRAL VALUE FUND | C CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.90%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Dividends on Short Sales

rr_Component1OtherExpensesOverAssets

2.85%

Interest Expense for Borrowings on Short Sales

rr_Component2OtherExpensesOverAssets

0.29%

Other

rr_Component3OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

3.14%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

6.06%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.30%)

^[3]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

5.76%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

576

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,768

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

2,933

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

5,724

1 Year

rr_AverageAnnualReturnYear01

3.05%

Since Inception

rr_AverageAnnualReturnSinceInception

3.30%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2011

MARKET NEUTRAL VALUE FUND | R CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.90%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Dividends on Short Sales

rr_Component1OtherExpensesOverAssets

2.85%

Interest Expense for Borrowings on Short Sales

rr_Component2OtherExpensesOverAssets

0.29%

Other

rr_Component3OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

3.14%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

5.56%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.30%)

^[3]

Total Annual Fund Operating Expenses After Waiver

rr_NetExpensesOverAssets

5.26%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

527

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,632

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

2,722

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

5,380

1 Year

rr_AverageAnnualReturnYear01

3.54%

Since Inception

rr_AverageAnnualReturnSinceInception

3.81%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2011

MARKET NEUTRAL VALUE FUND | Return After Taxes on Distributions | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

3.25%

Since Inception

rr_AverageAnnualReturnSinceInception

3.65%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2011

MARKET NEUTRAL VALUE FUND | Return After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

3.01%

Since Inception

rr_AverageAnnualReturnSinceInception

3.43%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2011

MARKET NEUTRAL VALUE FUND | Barclays U.S. 1-3 Month Treasury Bill Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

0.08%

Since Inception

rr_AverageAnnualReturnSinceInception

0.07%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2011

MID CAP VALUE FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

MID CAP VALUE FUND

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.

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 61% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

61.00%

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

Under normal market conditions, the portfolio managers will invest at least 80% of the fund's assets in medium size companies. The portfolio managers consider medium size companies to include those whose market capitalization at the time of purchase is within the capitalization range of the Russell 3000^® Index, excluding the largest 100 such companies. The portfolio managers intend to manage the fund so that its weighted capitalization falls within the capitalization range of the members of the Russell Midcap^® Index.

In selecting stocks for the fund, the portfolio managers look for companies whose stock price may not reflect the company's value. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company.

The fund may invest a portion of its assets in foreign securities when these securities meet the portfolio managers' standards of selection.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Mid Cap Stocks - The mid-sized companies in which the fund invests may present greater opportunities for capital growth than larger companies, but also may be more volatile and present greater risks.

• Style Risk - If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may decline, even if stock prices generally are rising.

• Foreign Securities - The fund may invest in foreign securities, which can be riskier than investing in 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. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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): 17.59%

Lowest Performance Quarter (4Q 2008): -18.96%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 15.16%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

15.16%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

17.59%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(18.96%)

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

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.

MID CAP VALUE FUND | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

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

Expense Example, with Redemption, 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 2005

rr_AnnualReturn2005

9.94%

Annual Return 2006

rr_AnnualReturn2006

20.49%

Annual Return 2007

rr_AnnualReturn2007

(2.14%)

Annual Return 2008

rr_AnnualReturn2008

(24.49%)

Annual Return 2009

rr_AnnualReturn2009

30.29%

Annual Return 2010

rr_AnnualReturn2010

19.57%

Annual Return 2011

rr_AnnualReturn2011

(0.72%)

Annual Return 2012

rr_AnnualReturn2012

16.44%

1 Year

rr_AverageAnnualReturnYear01

16.44%

5 Years

rr_AverageAnnualReturnYear05

6.33%

Since Inception

rr_AverageAnnualReturnSinceInception

8.61%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 31, 2004

MID CAP VALUE FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

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

Expense Example, with Redemption, 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

16.66%

5 Years

rr_AverageAnnualReturnYear05

6.54%

Since Inception

rr_AverageAnnualReturnSinceInception

9.07%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 02, 2004

MID CAP VALUE FUND | A CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

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

Expense Example, with Redemption, 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

9.46%

^[4]

5 Years

rr_AverageAnnualReturnYear05

4.81%

^[4]

Since Inception

rr_AverageAnnualReturnSinceInception

6.75%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Jan. 13, 2005

^[4]

MID CAP VALUE FUND | C CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

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

Expense Example, with Redemption, 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

15.25%

5 Years

rr_AverageAnnualReturnYear05

5.27%

^[5]

Since Inception

rr_AverageAnnualReturnSinceInception

7.53%

^[5]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

MID CAP VALUE FUND | R CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

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

Expense Example, with Redemption, 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

15.89%

5 Years

rr_AverageAnnualReturnYear05

5.81%

Since Inception

rr_AverageAnnualReturnSinceInception

6.21%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 29, 2005

MID CAP VALUE FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.65%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.66%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

68

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

212

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

368

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

823

MID CAP VALUE FUND | Return After Taxes on Distributions | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

15.49%

5 Years

rr_AverageAnnualReturnYear05

5.74%

Since Inception

rr_AverageAnnualReturnSinceInception

7.27%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 31, 2004

MID CAP VALUE FUND | Return After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

11.45%

5 Years

rr_AverageAnnualReturnYear05

5.32%

Since Inception

rr_AverageAnnualReturnSinceInception

6.90%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 31, 2004

MID CAP VALUE FUND | Russell Midcap® Value Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

18.51%

5 Years

rr_AverageAnnualReturnYear05

3.79%

Since Inception

rr_AverageAnnualReturnSinceInception

7.53%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 31, 2004

NT LARGE COMPANY VALUE FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

NT LARGE COMPANY VALUE FUND

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.

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 37% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

37.00%

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

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

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods, that you earn a 5% return each year, and that the fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The fund invests primarily in larger companies. Under normal market conditions, the portfolio managers will invest at least 80% of the fund's assets in equity securities of companies comprising the Russell 1000^® Index.

In selecting stocks for the fund, the portfolio managers look for companies whose stock price may not adequately reflect the company's value. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation 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

• Style Risk - If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may decline, even if stock prices generally are rising.

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

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

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

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

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

Risk Lose Money [Text]

rr_RiskLoseMoney

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

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Fund Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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): 16.37%

Lowest Performance Quarter (4Q 2008): -21.23%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Institutional Class year-to-date return was 16.13%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Institutional Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

16.13%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

16.37%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.23%)

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 One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

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

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary. The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

NT LARGE COMPANY VALUE FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fee

rr_ManagementFeesOverAssets

0.67%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.67%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

69

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

215

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

374

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

835

Annual Return 2007

rr_AnnualReturn2007

(1.18%)

Annual Return 2008

rr_AnnualReturn2008

(37.30%)

Annual Return 2009

rr_AnnualReturn2009

20.69%

Annual Return 2010

rr_AnnualReturn2010

11.00%

Annual Return 2011

rr_AnnualReturn2011

1.33%

Annual Return 2012

rr_AnnualReturn2012

16.63%

1 Year

rr_AverageAnnualReturnYear01

16.63%

5 Years

rr_AverageAnnualReturnYear05

(0.15%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.61%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT LARGE COMPANY VALUE FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fee

rr_ManagementFeesOverAssets

0.52%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.52%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

53

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

167

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

291

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

653

NT LARGE COMPANY VALUE FUND | Return After Taxes on Distributions | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

16.08%

5 Years

rr_AverageAnnualReturnYear05

(0.49%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.24%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT LARGE COMPANY VALUE FUND | Return After Taxes on Distributions and Sale of Fund Shares | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

11.51%

5 Years

rr_AverageAnnualReturnYear05

(0.18%)

Since Inception

rr_AverageAnnualReturnSinceInception

1.33%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

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

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

17.51%

5 Years

rr_AverageAnnualReturnYear05

0.59%

Since Inception

rr_AverageAnnualReturnSinceInception

2.21%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 28, 2006

NT LARGE COMPANY VALUE FUND | S&P 500® Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

16.00%

5 Years

rr_AverageAnnualReturnYear05

1.66%

Since Inception

rr_AverageAnnualReturnSinceInception

3.48%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 28, 2006

NT MID CAP VALUE FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

NT MID CAP VALUE FUND

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.

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 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

Under normal market conditions, the portfolio managers will invest at least 80% of the fund's assets in medium size companies. The portfolio managers consider medium size companies to include those whose market capitalization at the time of purchase is within the capitalization range of the Russell 3000^® Index, excluding the largest 100 such companies. The portfolio managers intend to manage the fund so that its weighted capitalization falls within the capitalization range of the members of the Russell Midcap^® Index.

In selecting stocks for the fund, the portfolio managers look for companies whose stock price may not reflect the company's value. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company.

The fund may invest a portion of its assets in foreign securities when these securities meet the portfolio managers' standards of selection.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects.

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

• Mid Cap Stocks - The mid-sized companies in which the fund invests may present greater opportunities for capital growth than larger companies, but also may be more volatile and present greater risks.

• Style Risk - If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may decline, even if stock prices generally are rising.

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

• Foreign Securities - The fund may invest in foreign securities, which can be riskier than investing in 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 Institutional Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.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 (3Q 2009): 17.60%

Lowest Performance Quarter (4Q 2008): -18.76%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Institutional Class year-to-date return was 15.47%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Institutional Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

15.47%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

17.60%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(18.76%)

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 One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

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

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary. The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

NT MID CAP VALUE FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

Expense Example, with Redemption, 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

(2.02%)

Annual Return 2008

rr_AnnualReturn2008

(24.16%)

Annual Return 2009

rr_AnnualReturn2009

31.03%

Annual Return 2010

rr_AnnualReturn2010

20.01%

Annual Return 2011

rr_AnnualReturn2011

(0.21%)

Annual Return 2012

rr_AnnualReturn2012

16.55%

1 Year

rr_AverageAnnualReturnYear01

16.55%

5 Years

rr_AverageAnnualReturnYear05

6.75%

Since Inception

rr_AverageAnnualReturnSinceInception

6.49%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT MID CAP VALUE FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fee

rr_ManagementFeesOverAssets

0.65%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.66%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

68

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

212

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

368

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

823

NT MID CAP VALUE FUND | Return After Taxes on Distributions | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

15.40%

5 Years

rr_AverageAnnualReturnYear05

5.65%

Since Inception

rr_AverageAnnualReturnSinceInception

5.08%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT MID CAP VALUE FUND | Return After Taxes on Distributions and Sale of Fund Shares | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

11.62%

5 Years

rr_AverageAnnualReturnYear05

5.44%

Since Inception

rr_AverageAnnualReturnSinceInception

5.00%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 12, 2006

NT MID CAP VALUE FUND | Russell Midcap® Value Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

18.51%

5 Years

rr_AverageAnnualReturnYear05

3.79%

Since Inception

rr_AverageAnnualReturnSinceInception

4.18%

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 28, 2006

SMALL CAP VALUE FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

SMALL CAP VALUE FUND

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.

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 126% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

126.00%

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

Under normal market conditions, the portfolio managers will invest at least 80% of the fund's assets in small cap companies. The portfolio managers consider small cap companies to include those with a market capitalization no larger than that of the largest company in the S&P Small Cap 600^® Index or the Russell 2000^® Index.

In selecting stocks for the fund, the portfolio managers look for equity securities of smaller companies whose stock price may not reflect the company's value. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• 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 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.

• 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. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (2Q 2009): 22.79%
Lowest Performance Quarter (4Q 2008): -21.23%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 13.79%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

13.79%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

22.79%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.23%)

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 VALUE FUND | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

1.25%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.17%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.42%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

145

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

450

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

777

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,701

Annual Return 2003

rr_AnnualReturn2003

36.11%

Annual Return 2004

rr_AnnualReturn2004

21.81%

Annual Return 2005

rr_AnnualReturn2005

8.40%

Annual Return 2006

rr_AnnualReturn2006

15.52%

Annual Return 2007

rr_AnnualReturn2007

(2.72%)

Annual Return 2008

rr_AnnualReturn2008

(27.63%)

Annual Return 2009

rr_AnnualReturn2009

38.75%

Annual Return 2010

rr_AnnualReturn2010

24.15%

Annual Return 2011

rr_AnnualReturn2011

(6.73%)

Annual Return 2012

rr_AnnualReturn2012

16.70%

1 Year

rr_AverageAnnualReturnYear01

16.70%

5 Years

rr_AverageAnnualReturnYear05

6.29%

10 Years

rr_AverageAnnualReturnYear10

10.60%

SMALL CAP VALUE FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.05%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.17%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.22%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

125

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

388

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

671

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,477

1 Year

rr_AverageAnnualReturnYear01

16.84%

5 Years

rr_AverageAnnualReturnYear05

6.50%

10 Years

rr_AverageAnnualReturnYear10

10.81%

SMALL CAP VALUE FUND | A CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.25%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.17%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.67%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

735

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,072

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,431

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,436

1 Year

rr_AverageAnnualReturnYear01

9.66%

^[4]

5 Years

rr_AverageAnnualReturnYear05

4.79%

^[4]

10 Years

rr_AverageAnnualReturnYear10

9.69%

^[4]

SMALL CAP VALUE FUND | C CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.25%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.17%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.42%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

246

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

756

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,291

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,752

1 Year

rr_AverageAnnualReturnYear01

15.36%

5 Years

rr_AverageAnnualReturnYear05

5.20%

^[6]

10 Years

rr_AverageAnnualReturnYear10

9.49%

^[6]

SMALL CAP VALUE FUND | R CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

1.25%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.17%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.92%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

195

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

604

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,038

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,240

1 Year

rr_AverageAnnualReturnYear01

16.04%

5 Years

rr_AverageAnnualReturnYear05

5.75%

^[6]

10 Years

rr_AverageAnnualReturnYear10

10.04%

^[6]

SMALL CAP VALUE FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.90%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.17%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.07%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

109

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

341

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

591

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,306

SMALL CAP VALUE FUND | Return After Taxes on Distributions | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

15.30%

5 Years

rr_AverageAnnualReturnYear05

5.63%

10 Years

rr_AverageAnnualReturnYear10

8.86%

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

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

11.77%

5 Years

rr_AverageAnnualReturnYear05

5.28%

10 Years

rr_AverageAnnualReturnYear10

8.67%

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

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

18.05%

5 Years

rr_AverageAnnualReturnYear05

3.55%

10 Years

rr_AverageAnnualReturnYear10

9.50%

VALUE FUND

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

VALUE FUND

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 48% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

48.00%

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

In selecting stocks for the fund, the portfolio managers look for companies of all sizes whose stock price may not reflect the company's value. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company.

The fund may invest a portion of its assets in foreign securities when these securities meet the portfolio managers' standards of selection.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Multi-Cap Investing - The fund is a multi-capitalization fund that invests in companies of all sizes. The small and medium-sized companies in which the fund invests may be more volatile and subject to greater risk than larger companies.

• Style Risk - If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may decline, even if stock prices generally are rising.

• Foreign Securities - The fund may invest in foreign securities, which can be riskier than investing in 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]

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

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

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www.americancentury.com

Performance Past Does Not Indicate Future [Text]

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The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

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Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

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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]

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Highest Performance Quarter (2Q 2003): 15.72%

Lowest Performance Quarter (4Q 2008): -16.86%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 16.34%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2013

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

16.34%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.72%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(16.86%)

Performance Table Heading

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

Performance Table Uses Highest Federal Rate

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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

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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]

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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]

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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.

VALUE FUND | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

0.99%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.00%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

102

Expense Example, with Redemption, 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

29.06%

Annual Return 2004

rr_AnnualReturn2004

14.36%

Annual Return 2005

rr_AnnualReturn2005

5.03%

Annual Return 2006

rr_AnnualReturn2006

18.51%

Annual Return 2007

rr_AnnualReturn2007

(5.20%)

Annual Return 2008

rr_AnnualReturn2008

(26.70%)

Annual Return 2009

rr_AnnualReturn2009

19.43%

Annual Return 2010

rr_AnnualReturn2010

13.41%

Annual Return 2011

rr_AnnualReturn2011

0.59%

Annual Return 2012

rr_AnnualReturn2012

14.55%

1 Year

rr_AverageAnnualReturnYear01

14.55%

5 Years

rr_AverageAnnualReturnYear05

2.72%

10 Years

rr_AverageAnnualReturnYear10

7.13%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 01, 1993

VALUE FUND | INSTITUTIONAL CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.79%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

82

Expense Example, with Redemption, 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

14.75%

5 Years

rr_AverageAnnualReturnYear05

2.92%

10 Years

rr_AverageAnnualReturnYear10

7.33%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 1997

VALUE FUND | A CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.99%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.25%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

695

Expense Example, with Redemption, 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

7.79%

^[1]

5 Years

rr_AverageAnnualReturnYear05

1.25%

^[1]

10 Years

rr_AverageAnnualReturnYear10

6.24%

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 02, 1996

^[1]

VALUE FUND | B CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

5.00%

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

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.00%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

603

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

928

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,179

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,132

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

203

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

628

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,079

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,132

1 Year

rr_AverageAnnualReturnYear01

9.43%

5 Years

rr_AverageAnnualReturnYear05

1.51%

Since Inception

rr_AverageAnnualReturnSinceInception

6.49%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jan. 31, 2003

VALUE FUND | C CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.99%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.00%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

203

Expense Example, with Redemption, 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

13.34%

5 Years

rr_AverageAnnualReturnYear05

1.71%

10 Years

rr_AverageAnnualReturnYear10

6.07%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 04, 2001

VALUE FUND | R CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.99%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.50%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

153

Expense Example, with Redemption, 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

14.03%

5 Years

rr_AverageAnnualReturnYear05

2.22%

Since Inception

rr_AverageAnnualReturnSinceInception

3.14%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 29, 2005

VALUE FUND | R6 CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.64%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.65%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

67

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

208

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

363

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 811

VALUE FUND | Return After Taxes on Distributions | INVESTOR CLASS

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

14.28%

5 Years

rr_AverageAnnualReturnYear05

2.40%

10 Years

rr_AverageAnnualReturnYear10

5.78%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 01, 1993

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

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

9.80%

5 Years

rr_AverageAnnualReturnYear05

2.27%

10 Years

rr_AverageAnnualReturnYear10

5.73%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 01, 1993

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

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

17.55%

5 Years

rr_AverageAnnualReturnYear05

0.83%

10 Years

rr_AverageAnnualReturnYear10

7.54%

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

Prospectus [Line Items]

rr_ProspectusLineItems

1 Year

rr_AverageAnnualReturnYear01

16.00%

5 Years

rr_AverageAnnualReturnYear05

1.66%

10 Years

rr_AverageAnnualReturnYear10

7.10%

[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.

[2] Prior to December 3, 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.

[3] The advisor has agreed to waive 0.30 percentage points of the fund's management fee. The advisor expects this waiver to continue until July 31, 2014 and cannot terminate it prior to such date without the approval of the Board of Directors.

[4] 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.

[5] 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.

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

XML

EQUITY INCOME FUND

EQUITY INCOME FUND

Investment Objective

The fund seeks current income.

Capital appreciation 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 B Shares EQUITY INCOME FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	B CLASS	C CLASS	R CLASS	R6 CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	none	none	none	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	none
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	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 EQUITY INCOME FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	B CLASS	C CLASS	R CLASS	R6 CLASS
Management Fee	0.93%	0.73%	0.93%	0.93%	0.93%	0.93%	0.58%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	1.00%	0.50%	none
Other Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	0.94%	0.74%	1.19%	1.94%	1.94%	1.44%	0.59%

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 EQUITY INCOME FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	96	300	521	1,155
INSTITUTIONAL CLASS	76	237	412	919
A CLASS	690	932	1,192	1,935
B CLASS	597	910	1,148	2,068
C CLASS	197	610	1,048	2,261
R CLASS	147	456	788	1,723
R6 CLASS	60	189	330	738

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
EQUITY INCOME FUND B CLASS	197	610	1,048	2,068

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 83% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers look for equity securities of companies with a favorable income-paying history that have prospects for income payments to continue or increase. The portfolio managers also look for equity securities of companies that they believe are undervalued and have the potential for an increase in price. To identify these undervalued companies, the portfolio managers look for companies with earnings, cash flows and/or assets that may not be reflected in the companies' stock prices or may be outside the companies' historical ranges.

The fund may invest a portion of its assets in foreign securities when these securities meet the portfolio managers' standards of selection.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects.

Principal Risks

• Discontinuance of Dividend Payments - If the stocks purchased by the fund do not continue dividend payments, the value of the fund's shares may decline, even if stock prices generally are rising.

• Style Risk - If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may decline, even if stock prices generally are rising.

• Convertible Securities Risk - The fund invests in convertible securities, which may be affected by changes in interest rates, the credit of the issuer and the value of the underlying common stock. In addition, because these securities are convertible into common stock, they are subject to general stock market risk, though to a lesser degree.

• Foreign Securities - The fund may invest in foreign securities, which can be riskier than investing in 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 Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

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

 Calendar Year Total Returns

Highest Performance Quarter (2Q 2003): 13.63%

Lowest Performance Quarter (4Q 2008): -11.31%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 11.77%.

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

Average Annual Total Returns EQUITY INCOME FUND		1 Year	5 Years	10 Years	Since Inception	Inception Date
INVESTOR CLASS		11.51%	3.26%	7.41%		Aug. 01, 1994
INVESTOR CLASS Return After Taxes on Distributions		10.91%	2.73%	6.26%		Aug. 01, 1994
INVESTOR CLASS Return After Taxes on Distributions and Sale of Fund Shares		8.25%	2.68%	6.08%		Aug. 01, 1994
INSTITUTIONAL CLASS		11.57%	3.46%	7.62%		Jul. 08, 1998
A CLASS	[1]	4.89%	1.78%	6.51%		Mar. 07, 1997
B CLASS		6.25%	2.07%		1.07%	Sep. 28, 2007
C CLASS		10.26%	2.23%	6.35%		Jul. 13, 2001
R CLASS		10.84%	2.75%		6.12%	Aug. 29, 2003
Russell 3000® Value Index (reflects no deduction for fees, expenses or taxes)		17.55%	0.83%	7.54%
S&P 500® Index (reflects no deduction for fees, expenses or taxes)		16.00%	1.66%	7.10%

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.

LARGE COMPANY VALUE FUND

LARGE COMPANY VALUE FUND

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 12 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 B Shares LARGE COMPANY VALUE FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	B CLASS	C CLASS	R CLASS	R6 CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	none	none	none	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	none
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	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 LARGE COMPANY VALUE FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	B CLASS	C CLASS	R CLASS	R6 CLASS
Management Fee	0.87%	0.67%	0.87%	0.87%	0.87%	0.87%	0.52%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	1.00%	0.50%	none
Other Expenses	none	none	none	none	none	none	none
Total Annual Fund Operating Expenses	0.87%	0.67%	1.12%	1.87%	1.87%	1.37%	0.52%

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 LARGE COMPANY VALUE FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	89	278	483	1,073
INSTITUTIONAL CLASS	69	215	374	835
A CLASS	683	911	1,157	1,860
B CLASS	590	889	1,112	1,993
C CLASS	190	589	1,012	2,188
R CLASS	140	435	751	1,645
R6 CLASS	53	167	291	653

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
LARGE COMPANY VALUE FUND B CLASS	190	589	1,012	1,993

 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 33% of the average value of its portfolio.

Principal Investment Strategies

The fund invests primarily in larger companies. Under normal market conditions, the portfolio managers will invest at least 80% of the fund's assets in equity securities of companies comprising the Russell 1000^® Index.

In selecting stocks for the fund, the portfolio managers look for companies whose stock price may not adequately reflect the company's value. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation criteria.

Principal Risks

• Style Risk - If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may decline, even if stock prices generally are rising.

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

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

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

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

Fund Performance

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

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

Calendar Year Total Returns

Highest Performance Quarter (2Q 2003): 17.47%

Lowest Performance Quarter (4Q 2008): -21.26%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 15.99%.

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

Average Annual Total Returns LARGE COMPANY VALUE FUND		1 Year	5 Years	10 Years	Since Inception	Inception Date
INVESTOR CLASS		16.41%	(0.19%)	6.08%		Jul. 30, 1999
INVESTOR CLASS Return After Taxes on Distributions		16.07%	(0.55%)	5.64%		Jul. 30, 1999
INVESTOR CLASS Return After Taxes on Distributions and Sale of Fund Shares		11.09%	(0.23%)	5.27%		Jul. 30, 1999
INSTITUTIONAL CLASS		16.64%	0.01%	6.29%		Aug. 10, 2001
A CLASS	[1]	9.74%	(1.62%)	5.18%		Oct. 26, 2000
B CLASS		11.42%	(1.39%)		5.34%	Jan. 31, 2003
C CLASS		15.27%	(1.18%)	5.02%		Nov. 07, 2001
R CLASS		15.84%	(0.69%)		4.47%	Aug. 29, 2003
Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes)		17.51%	0.59%	7.38%
S&P 500® Index (reflects no deduction for fees, expenses or taxes)		16.00%	1.66%	7.10%

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.

MARKET NEUTRAL VALUE FUND

MARKET NEUTRAL VALUE FUND

Investment Objective

The fund seeks long-term capital growth, independent of equity market conditions.

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 14 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 MARKET NEUTRAL VALUE 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 MARKET NEUTRAL VALUE FUND		INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Management Fee		1.90%	1.70%	1.90%	1.90%	1.90%
Distribution and Service (12b-1) Fees		none	none	0.25%	1.00%	0.50%
Dividends on Short Sales		2.85%	2.85%	2.85%	2.85%	2.85%
Interest Expense for Borrowings on Short Sales		0.29%	0.29%	0.29%	0.29%	0.29%
Other		none	none	none	none	none
Other Expenses		3.14%	3.14%	3.14%	3.14%	3.14%
Acquired Fund Fees and Expenses		0.02%	0.02%	0.02%	0.02%	0.02%
Total Annual Fund Operating Expenses		5.06%	4.86%	5.31%	6.06%	5.56%
Fee Waiver	[1]	0.30%	0.30%	0.30%	0.30%	0.30%
Total Annual Fund Operating Expenses After Waiver		4.76%	4.56%	5.01%	5.76%	5.26%

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 MARKET NEUTRAL VALUE FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	478	1,494	2,505	5,017
INSTITUTIONAL CLASS	459	1,438	2,417	4,866
A CLASS	1,049	2,048	3,039	5,477
C CLASS	576	1,768	2,933	5,724
R CLASS	527	1,632	2,722	5,380

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 588% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers use a value investment strategy to construct the portfolio for the fund. The portfolio managers buy, or take long positions in, equity securities they have identified as undervalued. They take short positions in equity securities that they have identified as overvalued. A short position arises when the fund sells a security it does not own but has borrowed in anticipation that the market price of the security will decline. To close out the short sale, the fund buys the same stock in the market and returns it to the lender. If the market price in fact declines, the fund can replace the borrowed security at a lower price and capture the value represented by the difference between the higher sale price and the lower replacement price. The fund's investment process is designed to maintain approximately equal dollar amounts invested in long and short positions at all times. By employing this market neutral strategy, the fund seeks to limit market risk (the effects of general market movements on the fund's performance). A market neutral strategy seeks to limit the fund's volatility relative to the market. As a result of this strategy, the portfolio's price movements are not expected to correlate with the market's price movements.

In selecting stocks for the fund's long portfolio, the portfolio managers look for companies of all sizes whose stock prices may not reflect the companies' values. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company. The portfolio managers use the same fundamental investment strategy to identify stocks that they believe are overvalued, which will make up the fund's short positions. In addition, the fund may take long or short positions in exchange traded funds or other securities that provide exposure to market or sector indices, underlying commodities or commodity indices the portfolio managers have identified as undervalued (for the long portfolio) or overvalued (for the short portfolio). The portfolio managers may also engage in capital structure arbitrage investment strategies.

The fund may invest a portion of its assets in foreign securities when these securities meet the portfolio managers' standards of selection.

The portfolio managers may sell stocks from the fund's long portfolio if they believe a stock no longer meets their valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects. Similarly, the portfolio managers may close out a short sale when they feel that a stock has moved closer to its fair value, and the company is no longer sufficiently overvalued to create an attractive short position.

Under normal market conditions, the fund intends to keep its assets invested primarily in U.S. equity securities. However, the fund may invest a portion of its assets in foreign securities. In addition, there may be times when the fund holds a significant portion of its assets in cash or cash equivalents.

Principal Risks

• Multi-Cap Investing - The fund is a multi-capitalization fund that invests in companies of all sizes. The small and medium-sized companies in which the fund invests may be more volatile and subject to greater risk than larger companies.

• Style Risk - If the market does not consider the individual stocks purchased for the fund's long portfolio to be undervalued and the stocks comprising the fund's short portfolio to be overvalued, the value of the fund's shares may decline, even if stock prices generally are rising.

• Failure to Maintain Market Neutrality - Though the fund seeks to limit risks associated with investing in the general equity market, external conditions may impact the fund's performance. In addition, although the portfolio managers intend to construct a market neutral portfolio, there is a risk that the portfolio managers will not construct a portfolio that limits exposure to general market movements.

• Short Sales Risk - If the price of a security increases after the fund borrows the security, the fund may suffer a loss when it replaces the borrowed security at the higher price. Any loss will be increased by the amount of compensation, interest or dividends, and transaction costs the fund must pay to a lender of the security.

• Foreign Securities - The fund may invest in foreign securities, which may be riskier than investing in 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 in its long portfolio, or in which the fund has taken a short position as well as 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 2012): 2.24%

Lowest Performance Quarter (2Q 2012): -0.39%

As of June 30, 2013, the most recent calendar quarter end, the fund's Investor Class year-to-date return was 1.28%.

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

Average Annual Total Returns MARKET NEUTRAL VALUE FUND	1 Year	Since Inception	Inception Date
INVESTOR CLASS	4.03%	4.32%	Oct. 31, 2011
INVESTOR CLASS Return After Taxes on Distributions	3.25%	3.65%	Oct. 31, 2011
INVESTOR CLASS Return After Taxes on Distributions and Sale of Fund Shares	3.01%	3.43%	Oct. 31, 2011
INSTITUTIONAL CLASS	4.23%	4.49%	Oct. 31, 2011
A CLASS	(2.17%)	(1.07%)	Oct. 31, 2011
C CLASS	3.05%	3.30%	Oct. 31, 2011
R CLASS	3.54%	3.81%	Oct. 31, 2011
Barclays U.S. 1-3 Month Treasury Bill Index (reflects no deduction for fees, expenses or taxes)	0.08%	0.07%	Oct. 31, 2011

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.

MID CAP VALUE FUND

MID CAP VALUE FUND

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.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees MID CAP VALUE FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS	R6 CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)	none	none	none	1.00%	none	none
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none	none

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

Annual Fund Operating Expenses MID CAP VALUE FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS	R6 CLASS
Management Fee	1.00%	0.80%	1.00%	1.00%	1.00%	0.65%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%	none
Other Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	1.01%	0.81%	1.26%	2.01%	1.51%	0.66%

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 MID CAP VALUE 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
R6 CLASS	68	212	368	823

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 61% of the average value of its portfolio.

Principal Investment Strategies

Under normal market conditions, the portfolio managers will invest at least 80% of the fund's assets in medium size companies. The portfolio managers consider medium size companies to include those whose market capitalization at the time of purchase is within the capitalization range of the Russell 3000^® Index, excluding the largest 100 such companies. The portfolio managers intend to manage the fund so that its weighted capitalization falls within the capitalization range of the members of the Russell Midcap^® Index.

In selecting stocks for the fund, the portfolio managers look for companies whose stock price may not reflect the company's value. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company.

The fund may invest a portion of its assets in foreign securities when these securities meet the portfolio managers' standards of selection.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects.

Principal Risks

• Mid Cap Stocks - The mid-sized companies in which the fund invests may present greater opportunities for capital growth than larger companies, but also may be more volatile and present greater risks.

• Style Risk - If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may decline, even if stock prices generally are rising.

• Foreign Securities - The fund may invest in foreign securities, which can be riskier than investing in 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. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

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

Calendar Year Total Returns

Highest Performance Quarter (3Q 2009): 17.59%

Lowest Performance Quarter (4Q 2008): -18.96%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 15.16%.

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

Average Annual Total Returns MID CAP VALUE FUND		1 Year	5 Years		Since Inception		Inception Date
INVESTOR CLASS		16.44%	6.33%		8.61%		Mar. 31, 2004
INVESTOR CLASS Return After Taxes on Distributions		15.49%	5.74%		7.27%		Mar. 31, 2004
INVESTOR CLASS Return After Taxes on Distributions and Sale of Fund Shares		11.45%	5.32%		6.90%		Mar. 31, 2004
INSTITUTIONAL CLASS		16.66%	6.54%		9.07%		Aug. 02, 2004
A CLASS	[1]	9.46%	4.81%		6.75%		Jan. 13, 2005
C CLASS		15.25%	5.27%	[2]	7.53%	[2]	Mar. 01, 2010
R CLASS		15.89%	5.81%		6.21%		Jul. 29, 2005
Russell Midcap® Value Index (reflects no deduction for fees, expenses or taxes)		18.51%	3.79%		7.53%		Mar. 31, 2004

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 LARGE COMPANY VALUE FUND

NT LARGE COMPANY VALUE FUND

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.

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

Annual Fund Operating Expenses NT LARGE COMPANY VALUE FUND	INSTITUTIONAL CLASS	R6 CLASS
Management Fee	0.67%	0.52%
Distribution and Service (12b-1) Fees	none	none
Other Expenses	none	none
Total Annual Fund Operating Expenses	0.67%	0.52%

Example

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

The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods, that you earn a 5% return each year, and that the fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example NT LARGE COMPANY VALUE FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INSTITUTIONAL CLASS	69	215	374	835
R6 CLASS	53	167	291	653

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 37% of the average value of its portfolio.

Principal Investment Strategies

The fund invests primarily in larger companies. Under normal market conditions, the portfolio managers will invest at least 80% of the fund's assets in equity securities of companies comprising the Russell 1000^® Index.

In selecting stocks for the fund, the portfolio managers look for companies whose stock price may not adequately reflect the company's value. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation 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

• Style Risk - If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may decline, even if stock prices generally are rising.

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

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

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

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

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

Fund Performance

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

Calendar Year Total Returns

Highest Performance Quarter (2Q 2009): 16.37%

Lowest Performance Quarter (4Q 2008): -21.23%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Institutional Class year-to-date return was 16.13%.

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

Average Annual Total Returns NT LARGE COMPANY VALUE FUND	1 Year	5 Years	Since Inception	Inception Date
INSTITUTIONAL CLASS	16.63%	(0.15%)	1.61%	May 12, 2006
INSTITUTIONAL CLASS Return After Taxes on Distributions	16.08%	(0.49%)	1.24%	May 12, 2006
INSTITUTIONAL CLASS Return After Taxes on Distributions and Sale of Fund Shares	11.51%	(0.18%)	1.33%	May 12, 2006
Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes)	17.51%	0.59%	2.21%	Apr. 28, 2006
S&P 500® Index (reflects no deduction for fees, expenses or taxes)	16.00%	1.66%	3.48%	Apr. 28, 2006

The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary. The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

NT MID CAP VALUE FUND

NT MID CAP VALUE FUND

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.

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

Annual Fund Operating Expenses NT MID CAP VALUE FUND	INSTITUTIONAL CLASS	R6 CLASS
Management Fee	0.80%	0.65%
Distribution and Service (12b-1) Fees	none	none
Other Expenses	0.01%	0.01%
Total Annual Fund Operating Expenses	0.81%	0.66%

Example

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

The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods, that you earn a 5% return each year, and that the fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example NT MID CAP VALUE FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INSTITUTIONAL CLASS	83	259	450	1,002
R6 CLASS	68	212	368	823

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

Under normal market conditions, the portfolio managers will invest at least 80% of the fund's assets in medium size companies. The portfolio managers consider medium size companies to include those whose market capitalization at the time of purchase is within the capitalization range of the Russell 3000^® Index, excluding the largest 100 such companies. The portfolio managers intend to manage the fund so that its weighted capitalization falls within the capitalization range of the members of the Russell Midcap^® Index.

In selecting stocks for the fund, the portfolio managers look for companies whose stock price may not reflect the company's value. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company.

The fund may invest a portion of its assets in foreign securities when these securities meet the portfolio managers' standards of selection.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects.

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

• Mid Cap Stocks - The mid-sized companies in which the fund invests may present greater opportunities for capital growth than larger companies, but also may be more volatile and present greater risks.

• Style Risk - If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may decline, even if stock prices generally are rising.

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

• Foreign Securities - The fund may invest in foreign securities, which can be riskier than investing in 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 Institutional Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

Calendar Year Total Returns

Highest Performance Quarter (3Q 2009): 17.60%

Lowest Performance Quarter (4Q 2008): -18.76%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Institutional Class year-to-date return was 15.47%.

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

Average Annual Total Returns NT MID CAP VALUE FUND	1 Year	5 Years	Since Inception	Inception Date
INSTITUTIONAL CLASS	16.55%	6.75%	6.49%	May 12, 2006
INSTITUTIONAL CLASS Return After Taxes on Distributions	15.40%	5.65%	5.08%	May 12, 2006
INSTITUTIONAL CLASS Return After Taxes on Distributions and Sale of Fund Shares	11.62%	5.44%	5.00%	May 12, 2006
Russell Midcap® Value Index (reflects no deduction for fees, expenses or taxes)	18.51%	3.79%	4.18%	Apr. 28, 2006

The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary. The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs.

SMALL CAP VALUE FUND

SMALL CAP VALUE FUND

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.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees SMALL CAP VALUE FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS	R6 CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase)	none	none	none	1.00%	none	none
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	none	none	none	none

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 VALUE FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS	R6 CLASS
Management Fee	1.25%	1.05%	1.25%	1.25%	1.25%	0.90%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%	none
Other Expenses	none	none	none	none	none	none
Acquired Fund Fees and Expenses	0.17%	0.17%	0.17%	0.17%	0.17%	0.17%
Total Annual Fund Operating Expenses	1.42%	1.22%	1.67%	2.42%	1.92%	1.07%

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 SMALL CAP VALUE FUND (USD $)	1 Year	3 Years	5 Years	10 Years
INVESTOR CLASS	145	450	777	1,701
INSTITUTIONAL CLASS	125	388	671	1,477
A CLASS	735	1,072	1,431	2,436
C CLASS	246	756	1,291	2,752
R CLASS	195	604	1,038	2,240
R6 CLASS	109	341	591	1,306

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 126% of the average value of its portfolio.

Principal Investment Strategies

Under normal market conditions, the portfolio managers will invest at least 80% of the fund's assets in small cap companies. The portfolio managers consider small cap companies to include those with a market capitalization no larger than that of the largest company in the S&P Small Cap 600^® Index or the Russell 2000^® Index.

In selecting stocks for the fund, the portfolio managers look for equity securities of smaller companies whose stock price may not reflect the company's value. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects.

Principal Risks

• 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 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.

• 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. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

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

Calendar Year Total Returns

Highest Performance Quarter (2Q 2009): 22.79%
Lowest Performance Quarter (4Q 2008): -21.23%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 13.79%.

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

Average Annual Total Returns SMALL CAP VALUE FUND		1 Year	5 Years		10 Years
INVESTOR CLASS		16.70%	6.29%		10.60%
INVESTOR CLASS Return After Taxes on Distributions		15.30%	5.63%		8.86%
INVESTOR CLASS Return After Taxes on Distributions and Sale of Fund Shares		11.77%	5.28%		8.67%
INSTITUTIONAL CLASS		16.84%	6.50%		10.81%
A CLASS	[1]	9.66%	4.79%		9.69%
C CLASS		15.36%	5.20%	[2]	9.49%	[2]
R CLASS		16.04%	5.75%	[2]	10.04%	[2]
Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes)		18.05%	3.55%		9.50%

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.

VALUE FUND

VALUE FUND

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 B Shares VALUE FUND (USD $)	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	B CLASS	C CLASS	R CLASS	R6 CLASS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none	5.75%	none	none	none	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	none
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25	none	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 VALUE FUND	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	B CLASS	C CLASS	R CLASS	R6 CLASS
Management Fee	0.99%	0.79%	0.99%	0.99%	0.99%	0.99%	0.64%
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	1.00%	0.50%	none
Other Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	1.00%	0.80%	1.25%	2.00%	2.00%	1.50%	0.65%

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 VALUE 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
B CLASS	603	928	1,179	2,132
C CLASS	203	628	1,079	2,324
R CLASS	153	475	819	1,789
R6 CLASS	67	208	363	811

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
VALUE FUND B CLASS	203	628	1,079	2,132

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 48% of the average value of its portfolio.

Principal Investment Strategies

In selecting stocks for the fund, the portfolio managers look for companies of all sizes whose stock price may not reflect the company's value. The managers attempt to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the managers believe more accurately reflects the fair value of the company.

The fund may invest a portion of its assets in foreign securities when these securities meet the portfolio managers' standards of selection.

The portfolio managers may sell stocks from the fund's portfolio if they believe a stock no longer meets their valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects.

Principal Risks

• Multi-Cap Investing - The fund is a multi-capitalization fund that invests in companies of all sizes. The small and medium-sized companies in which the fund invests may be more volatile and subject to greater risk than larger companies.

• Style Risk - If the market does not consider the individual stocks purchased by the fund to be undervalued, the value of the fund's shares may decline, even if stock prices generally are rising.

• Foreign Securities - The fund may invest in foreign securities, which can be riskier than investing in 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. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, please visit americancentury.com.

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

Calendar Year Total Returns

Highest Performance Quarter (2Q 2003): 15.72%

Lowest Performance Quarter (4Q 2008): -16.86%

As of June 30, 2013, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 16.34%.

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

Average Annual Total Returns VALUE FUND		1 Year	5 Years	10 Years	Since Inception	Inception Date
INVESTOR CLASS		14.55%	2.72%	7.13%		Sep. 01, 1993
INVESTOR CLASS Return After Taxes on Distributions		14.28%	2.40%	5.78%		Sep. 01, 1993
INVESTOR CLASS Return After Taxes on Distributions and Sale of Fund Shares		9.80%	2.27%	5.73%		Sep. 01, 1993
INSTITUTIONAL CLASS		14.75%	2.92%	7.33%		Jul. 31, 1997
A CLASS	[1]	7.79%	1.25%	6.24%		Oct. 02, 1996
B CLASS		9.43%	1.51%		6.49%	Jan. 31, 2003
C CLASS		13.34%	1.71%	6.07%		Jun. 04, 2001
R CLASS		14.03%	2.22%		3.14%	Jul. 29, 2005
Russell 3000® Value Index (reflects no deduction for fees, expenses or taxes)		17.55%	0.83%	7.54%
S&P 500® Index (reflects no deduction for fees, expenses or taxes)		16.00%	1.66%	7.10%

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] 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 December 3, 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] The advisor has agreed to waive 0.30 percentage points of the fund's management fee. The advisor expects this waiver to continue until July 31, 2014 and cannot terminate it prior to such date without the approval of the Board of Directors.

[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 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 and R Classes prior to their inception is based on the performance of Investor Class shares. 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 has been restated to reflect this charge.