485BPOS

As Filed with the U.S. Securities and Exchange Commission on December 19, 2012

1933 Act File No. 333-116351

1940 Act File No. 811-21591

	UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C.  20549
	__________________
	FORM N-1A
	__________________
	REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933		T
	Pre-Effective Amendment No.		£
	Post-Effective Amendment No. 22		T
	and/or
	REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940		T
	Amendment No. 23		T
	(Check appropriate box or boxes.)
	__________________
	AMERICAN CENTURY ASSET ALLOCATION 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)
þ		immediately upon filing pursuant to paragraph (b)
¨		on (date) pursuant to paragraph (b)
£		60 days after filing pursuant to paragraph (a)(1)
£		on (date) pursuant to paragraph (a)(1)
£		75 days after filing pursuant to paragraph (a)(2)
¨		on (date) pursuant to paragraph (a)(2) of rule 485.
If appropriate, check the following box:
£		this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement amendment pursuant to Rule 485(b) promulgated under the Securities Act of 1933, as amended, and has duly caused this amendment to be signed on its behalf by the undersigned, duly authorized, in the City of Kansas City, State of Missouri on the 19th day of December, 2012.

American Century Asset Allocation 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	December 19, 2012
* _________________________________ C. Jean Wade	Vice President, Treasurer and Chief Financial Officer	December 19, 2012
* _________________________________ Thomas A. Brown	Director	December 19, 2012
* _________________________________ Barry Fink	Director	December 19, 2012
* _________________________________ Andrea C. Hall, Ph.D.	Director	December 19, 2012
* _________________________________ Jan M. Lewis	Director	December 19, 2012
* _________________________________ James A. Olson	Director	December 19, 2012
* _________________________________ Donald H. Pratt	Chairman of the Board and Director	December 19, 2012

* _________________________________ M. Jeannine Strandjord	Director	December 19, 2012
* _________________________________ John R. Whitten	Director	December 19, 2012
* _________________________________ Stephen E. Yates	Director	December 19, 2012

*By:       /s/ Kathleen Gunja Nelson                       

Kathleen Gunja Nelson

Attorney in Fact

(pursuant to Power of Attorney

effective December 4, 2012 and filed herewith)

POWER OF ATTORNEY

I, the undersigned Director/Officer of the following investment companies:

AMERICAN CENTURY MUTUAL FUNDS, INC.

AMERICAN CENTURY WORLD MUTUAL FUNDS, INC.

AMERICAN CENTURY CAPITAL PORTFOLIOS, INC.

AMERICAN CENTURY STRATEGIC ASSET ALLOCATIONS, INC.

AMERICAN CENTURY ASSET ALLOCATION PORTFOLIOS, INC.

AMERICAN CENTURY VARIABLE PORTFOLIOS, INC.

AMERICAN CENTURY GROWTH FUNDS, INC.

(“the Funds”)

hereby constitute and appoint, Ryan L. Blaine, Brian L. Brogan, Danielle D. Cook, Christine J. Crossley, Kathleen Gunja Nelson, Elizabeth L. Richards, and Daniel K. Richardson, each of them singly, my true and lawful attorneys-in-fact, with full power of substitution, and with full power to each of them, (a) to sign for me and in my name in the appropriate capacities, all Registration Statements of the Funds on Form N-1A, or any successor thereto, any and all subsequent Amendments, Pre-Effective Amendments, or Post-Effective Amendments to said Registration Statements on Form N-1A or any successor thereto,  and any supplements or other instruments in connection therewith; (b) to make, file, execute, amend and withdraw documents of every kind, and to take other action of whatever kind they may elect, for the purpose of complying with all laws relating to the sale of securities of the Fund; and (c) generally to do all such things in my name and behalf in connection therewith as said attorneys-in-fact deem necessary or appropriate, to comply with the provisions of the Securities Act of 1933 and the Investment Company Act of 1940, and all related requirements of the Securities and Exchange Commission. I hereby ratify and confirm all that said attorneys-in-fact or their substitutes may do or cause to be done by virtue hereof. This power of attorney is effective for all documents filed on or after December 4, 2012.

This power of attorney may be executed in counterparts, each of which shall be deemed an original, but all of which shall constitute one and the same instrument.

WITNESS my hand on this 4th day of December, 2012.

Signature

/s/ Thomas A. Brown _________________________________	/s/ Barry Fink _________________________________
Thomas A. Brown, Director	Barry Fink, Director
/s/ Andrea C. Hall _________________________________	/s/ Jan M. Lewis _________________________________
Andrea C. Hall, Director	Jan M. Lewis, Director
/s/ James A. Olson _________________________________	/s/ Donald H. Pratt _________________________________
James A. Olson, Director	Donald H. Pratt, Chairman and Director
/s/ M. Jeannine Strandjord _________________________________	/s/ Jonathan Thomas _________________________________
M. Jeannine Strandjord, Director	Jonathan Thomas, President and Director
/s/ John R. Whitten _________________________________	/s/ Stephen E. Yates _________________________________
John R. Whitten, Director	Stephen E. Yates, Director
/s/ C. Jean Wade _________________________________
C. Jean Wade, Vice President, Treasurer and Chief Financial Officer

AMERICAN CENTURY MUTUAL FUNDS, INC.

AMERICAN CENTURY WORLD MUTUAL FUNDS, INC.

AMERICAN CENTURY CAPITAL PORTFOLIOS, INC.

AMERICAN CENTURY STRATEGIC ASSET ALLOCATIONS, INC.

AMERICAN CENTURY ASSET ALLOCATION PORTFOLIOS, INC.

AMERICAN CENTURY VARIABLE PORTFOLIOS, INC.

AMERICAN CENTURY GROWTH FUNDS, INC.

(“the Funds”)

I, Ward D. Stauffer, Secretary of the above-referenced corporations, do hereby certify that the following is a true copy of certain resolutions adopted by the Board of Directors of the above-referenced corporations on December 4, 2012, and that such resolutions have not been rescinded or modified and are not inconsistent with the Certificate of Incorporation, Declaration of Trust or Bylaws of the corporations.

WHEREAS:

·   Pursuant to a duly-executed Power of Attorney, the Directors and officers of American Century Mutual Funds, Inc., American Century World Mutual Funds, Inc., American Century Capital Portfolios, Inc., American Century Strategic Asset Allocations, Inc., American Century Asset Allocation Portfolios, Inc., American Century Variable Portfolios, Inc., and American Century Growth Funds, Inc. (collectively, the “Funds”) have appointed Ryan L. Blaine, Brian L. Brogan, Danielle D. Cook, Christine J. Crossley, Kathleen Gunja Nelson, Elizabeth L. Richards, and Daniel K. Richardson, each of them singly, their true and lawful attorneys-in-fact, with full power of substitution, and with full power to each, for the purpose of signing on their behalf registration statements and other related documents of the Funds for the purpose of complying with all laws relating to the sale of securities of the Funds and to do all such things in their names and behalf in connection therewith.

·   Such attorneys-in-fact may, from time to time, sign documents, including registration statements, amendments or supplements thereto and instruments in connection therewith, on behalf of directors and officers who have appointed them.

RESOLVED, that the Directors hereby authorize such attorneys-in-fact to sign the documents of the Funds, including registration statements, amendments or supplements thereto and instruments in connection therewith, pursuant to the Power of Attorney so executed by the Directors and certain officers of the Funds.

IN WITNESS WHEREOF, I have hereunto set my hand this 4th day of December, 2012.

/s/ Ward D. Stauffer

Ward D. Stauffer

Secretary

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

Risk/Return:

rr_RiskReturnAbstract

Document Type

dei_DocumentType

485BPOS

Document Period End Date

dei_DocumentPeriodEndDate

Jul. 31, 2012

Registrant Name

dei_EntityRegistrantName

AMERICAN CENTURY ASSET ALLOCATION PORTFOLIOS, INC.

Central Index Key

dei_EntityCentralIndexKey

0001293210

Amendment Flag

dei_AmendmentFlag

false

Document Creation Date

dei_DocumentCreationDate

Nov. 28, 2012

Document Effective Date

dei_DocumentEffectiveDate

Dec. 01, 2012

Prospectus Date

rr_ProspectusDate

Dec. 01, 2012

LIVESTRONG INCOME PORTFOLIO

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

LIVESTRONG INCOME PORTFOLIO

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 58 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

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 28% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

28.00%

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 58 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

LIVESTRONG Income Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	45.00%	Fixed-Income Securities (Bond Funds)	45.00%
NT Core Equity Plus Fund	3.00%	High-Yield Fund	3.80%
NT Equity Growth Fund	10.00%	Inflation-Adjusted Bond Fund	7.60%
NT Growth Fund	6.50%	International Bond Fund	7.00%
NT International Growth Fund	5.00%	NT Diversified Bond Fund	26.60%
NT Large Company Value Fund	11.00%
NT Mid Cap Value Fund	4.00%	Cash Equivalents (Money Market Funds)	10.00%
NT Small Company Fund	2.00%	Premium Money Market Fund	10.00%
NT Vista Fund	2.50%
Real Estate Fund	1.00%

The target asset mix of LIVESTRONG Income Portfolio is expected to remain fixed over time. The fund is generally intended for investors near to, at, or in retirement and who likely are no longer making new investments in the fund. The fund is designed for investors who plan to gradually withdraw the value of their account after retirement. The fund assumes a retirement age of 65 and may not be appropriate for an investor retiring at an age well before or after age 65.

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds, we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities.  Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (3Q 2009): 9.30%

Lowest Performance Quarter (4Q 2008): -9.20%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 9.35%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

9.35%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

9.30%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(9.20%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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.

LIVESTRONG INCOME PORTFOLIO | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

5 Years

rr_AverageAnnualReturnYear05

(0.01%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.41%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG INCOME PORTFOLIO | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

5 Years

rr_AverageAnnualReturnYear05

6.50%

Since Inception

rr_AverageAnnualReturnSinceInception

5.51%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG INCOME PORTFOLIO | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.57%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.77%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

79

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

246

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

428

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

955

Annual Return 2005

rr_AnnualReturn2005

2.63%

Annual Return 2006

rr_AnnualReturn2006

9.26%

Annual Return 2007

rr_AnnualReturn2007

7.18%

Annual Return 2008

rr_AnnualReturn2008

(16.57%)

Annual Return 2009

rr_AnnualReturn2009

16.42%

Annual Return 2010

rr_AnnualReturn2010

10.07%

Annual Return 2011

rr_AnnualReturn2011

3.58%

1 Year

rr_AverageAnnualReturnYear01

3.58%

5 Years

rr_AverageAnnualReturnYear05

3.48%

Since Inception

rr_AverageAnnualReturnSinceInception

4.82%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG INCOME PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.83%

5 Years

rr_AverageAnnualReturnYear05

2.55%

Since Inception

rr_AverageAnnualReturnSinceInception

3.75%

LIVESTRONG INCOME PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.45%

5 Years

rr_AverageAnnualReturnYear05

2.48%

Since Inception

rr_AverageAnnualReturnSinceInception

3.57%

LIVESTRONG INCOME PORTFOLIO | INSTITUTIONAL CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

none

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.57%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.57%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

58

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

183

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

319

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

714

1 Year

rr_AverageAnnualReturnYear01

3.78%

5 Years

rr_AverageAnnualReturnYear05

3.69%

Since Inception

rr_AverageAnnualReturnSinceInception

5.03%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG INCOME PORTFOLIO | A CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.57%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.02%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

673

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

882

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,106

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,751

1 Year

rr_AverageAnnualReturnYear01

(2.60%)

^[1]

5 Years

rr_AverageAnnualReturnYear05

2.00%

^[1]

Since Inception

rr_AverageAnnualReturnSinceInception

3.72%

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

^[1]

LIVESTRONG INCOME PORTFOLIO | C Class

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.57%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.77%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

180

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

558

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

960

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,082

1 Year

rr_AverageAnnualReturnYear01

2.46%

^[2]

5 Years

rr_AverageAnnualReturnYear05

2.43%

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

3.76%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

^[2]

LIVESTRONG INCOME PORTFOLIO | R CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.57%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.27%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

130

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

403

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

698

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,533

1 Year

rr_AverageAnnualReturnYear01

2.97%

5 Years

rr_AverageAnnualReturnYear05

2.96%

Since Inception

rr_AverageAnnualReturnSinceInception

4.28%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2015 PORTFOLIO

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

LIVESTRONG 2015 PORTFOLIO

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

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 58 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

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 19% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

19.00%

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 58 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

LIVESTRONG 2015 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	46.85%	Fixed-Income Securities (Bond Funds)	44.15%
NT Core Equity Plus Fund	3.00%	High-Yield Fund	3.75%
NT Emerging Markets Fund	0.50%	Inflation-Adjusted Bond Fund	7.50%
NT Equity Growth Fund	9.75%	International Bond Fund	6.65%
NT Growth Fund	7.00%	NT Diversified Bond Fund	26.25%
NT International Growth Fund	5.25%
NT Large Company Value Fund	11.00%	Cash Equivalents (Money Market Funds)	9.00%
NT Mid Cap Value Fund	4.25%	Premium Money Market Fund	9.00%
NT Small Company Fund	2.00%
NT Vista Fund	3.00%
Real Estate Fund	1.10%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund.  The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (3Q 2009): 10.20%

Lowest Performance Quarter (4Q 2008): -11.00%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 9.75%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

9.75%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

10.20%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(11.00%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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.

LIVESTRONG 2015 PORTFOLIO | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

5 Years

rr_AverageAnnualReturnYear05

(0.01%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.41%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2015 PORTFOLIO | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

5 Years

rr_AverageAnnualReturnYear05

6.50%

Since Inception

rr_AverageAnnualReturnSinceInception

5.51%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2015 PORTFOLIO | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.59%

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

Annual Return 2005

rr_AnnualReturn2005

4.70%

Annual Return 2006

rr_AnnualReturn2006

10.53%

Annual Return 2007

rr_AnnualReturn2007

8.50%

Annual Return 2008

rr_AnnualReturn2008

(20.10%)

Annual Return 2009

rr_AnnualReturn2009

18.26%

Annual Return 2010

rr_AnnualReturn2010

10.84%

Annual Return 2011

rr_AnnualReturn2011

3.16%

1 Year

rr_AverageAnnualReturnYear01

3.16%

5 Years

rr_AverageAnnualReturnYear05

3.23%

Since Inception

rr_AverageAnnualReturnSinceInception

5.37%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2015 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.46%

5 Years

rr_AverageAnnualReturnYear05

2.33%

Since Inception

rr_AverageAnnualReturnSinceInception

4.38%

LIVESTRONG 2015 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.18%

5 Years

rr_AverageAnnualReturnYear05

2.28%

Since Inception

rr_AverageAnnualReturnSinceInception

4.13%

LIVESTRONG 2015 PORTFOLIO | INSTITUTIONAL CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

none

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.59%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.60%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

61

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

193

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

335

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

751

1 Year

rr_AverageAnnualReturnYear01

3.36%

5 Years

rr_AverageAnnualReturnYear05

3.45%

Since Inception

rr_AverageAnnualReturnSinceInception

5.59%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2015 PORTFOLIO | A CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.59%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.05%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

676

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

890

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,122

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,784

1 Year

rr_AverageAnnualReturnYear01

(3.05%)

^[1]

5 Years

rr_AverageAnnualReturnYear05

1.75%

^[1]

Since Inception

rr_AverageAnnualReturnSinceInception

4.27%

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

^[1]

LIVESTRONG 2015 PORTFOLIO | C Class

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.59%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.80%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

183

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

567

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

976

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,114

1 Year

rr_AverageAnnualReturnYear01

2.13%

^[2]

5 Years

rr_AverageAnnualReturnYear05

2.20%

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

4.32%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

^[2]

LIVESTRONG 2015 PORTFOLIO | R CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.59%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.30%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

133

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

413

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

714

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,567

1 Year

rr_AverageAnnualReturnYear01

2.65%

5 Years

rr_AverageAnnualReturnYear05

2.71%

Since Inception

rr_AverageAnnualReturnSinceInception

4.85%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2020 PORTFOLIO

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

LIVESTRONG 2020 PORTFOLIO

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

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 58 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

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 28% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

28.00%

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 58 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

LIVESTRONG 2020 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	52.10%	Fixed-Income Securities (Bond Funds)	41.40%
NT Core Equity Plus Fund	3.00%	High-Yield Fund	3.60%
NT Emerging Markets Fund	1.75%	Inflation-Adjusted Bond Fund	7.20%
NT Equity Growth Fund	9.50%	International Bond Fund	5.60%
NT Growth Fund	8.00%	NT Diversified Bond Fund	25.00%
NT International Growth Fund	6.25%
NT Large Company Value Fund	11.25%	Cash Equivalents (Money Market Funds)	6.50%
NT Mid Cap Value Fund	5.00%	Premium Money Market Fund	6.50%
NT Small Company Fund	2.00%
NT Vista Fund	4.00%
Real Estate Fund	1.35%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (3Q 2009): 11.07%

Lowest Performance Quarter (3Q 2011): -8.06%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 10.36%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

10.36%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

11.07%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(8.06%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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.

LIVESTRONG 2020 PORTFOLIO | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

Since Inception

rr_AverageAnnualReturnSinceInception

(0.55%)

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2020 PORTFOLIO | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

Since Inception

rr_AverageAnnualReturnSinceInception

6.79%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2020 PORTFOLIO | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.83%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

85

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

265

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

461

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,026

Annual Return 2009

rr_AnnualReturn2009

20.11%

Annual Return 2010

rr_AnnualReturn2010

11.70%

Annual Return 2011

rr_AnnualReturn2011

2.50%

1 Year

rr_AverageAnnualReturnYear01

2.50%

Since Inception

rr_AverageAnnualReturnSinceInception

2.00%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2020 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.78%

Since Inception

rr_AverageAnnualReturnSinceInception

1.38%

LIVESTRONG 2020 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.81%

Since Inception

rr_AverageAnnualReturnSinceInception

1.39%

LIVESTRONG 2020 PORTFOLIO | INSTITUTIONAL CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

none

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.63%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

65

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

202

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

352

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

787

1 Year

rr_AverageAnnualReturnYear01

2.71%

Since Inception

rr_AverageAnnualReturnSinceInception

2.21%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2020 PORTFOLIO | A CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.08%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

679

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

899

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,137

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,816

1 Year

rr_AverageAnnualReturnYear01

(3.66%)

^[1]

Since Inception

rr_AverageAnnualReturnSinceInception

0.08%

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

^[1]

LIVESTRONG 2020 PORTFOLIO | C Class

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.83%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

186

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

576

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

991

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,145

1 Year

rr_AverageAnnualReturnYear01

1.58%

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

1.01%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

^[2]

LIVESTRONG 2020 PORTFOLIO | R CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.33%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

136

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

422

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

730

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,601

1 Year

rr_AverageAnnualReturnYear01

1.99%

Since Inception

rr_AverageAnnualReturnSinceInception

1.49%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2025 PORTFOLIO

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

LIVESTRONG 2025 PORTFOLIO

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

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 58 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

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 21% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

21.00%

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 58 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

LIVESTRONG 2025 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	57.35%	Fixed-Income Securities (Bond Funds)	37.65%
NT Core Equity Plus Fund	3.00%	High-Yield Fund	3.40%
NT Emerging Markets Fund	2.50%	Inflation-Adjusted Bond Fund	6.75%
NT Equity Growth Fund	9.25%	International Bond Fund	4.00%
NT Growth Fund	9.50%	NT Diversified Bond Fund	23.50%
NT International Growth Fund	7.25%
NT Large Company Value Fund	11.50%	Cash Equivalents (Money Market Funds)	5.00%
NT Mid Cap Value Fund	5.50%	Premium Money Market Fund	5.00%
NT Small Company Fund	2.60%
NT Vista Fund	4.65%
Real Estate Fund	1.60%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (3Q 2009): 11.70%

Lowest Performance Quarter (4Q 2008): -13.92%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 10.95%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

10.95%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

11.70%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(13.92%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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.

LIVESTRONG 2025 PORTFOLIO | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

5 Years

rr_AverageAnnualReturnYear05

(0.01%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.41%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2025 PORTFOLIO | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

5 Years

rr_AverageAnnualReturnYear05

6.50%

Since Inception

rr_AverageAnnualReturnSinceInception

5.51%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2025 PORTFOLIO | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.65%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.86%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

88

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

275

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

477

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,061

Annual Return 2005

rr_AnnualReturn2005

6.42%

Annual Return 2006

rr_AnnualReturn2006

11.80%

Annual Return 2007

rr_AnnualReturn2007

9.29%

Annual Return 2008

rr_AnnualReturn2008

(25.02%)

Annual Return 2009

rr_AnnualReturn2009

21.24%

Annual Return 2010

rr_AnnualReturn2010

12.57%

Annual Return 2011

rr_AnnualReturn2011

1.77%

1 Year

rr_AverageAnnualReturnYear01

1.77%

5 Years

rr_AverageAnnualReturnYear05

2.62%

Since Inception

rr_AverageAnnualReturnSinceInception

5.55%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2025 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.14%

5 Years

rr_AverageAnnualReturnYear05

1.82%

Since Inception

rr_AverageAnnualReturnSinceInception

4.61%

LIVESTRONG 2025 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.29%

5 Years

rr_AverageAnnualReturnYear05

1.83%

Since Inception

rr_AverageAnnualReturnSinceInception

4.34%

LIVESTRONG 2025 PORTFOLIO | INSTITUTIONAL CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

none

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.65%

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

1 Year

rr_AverageAnnualReturnYear01

1.97%

5 Years

rr_AverageAnnualReturnYear05

2.81%

Since Inception

rr_AverageAnnualReturnSinceInception

5.75%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2025 PORTFOLIO | A CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.65%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.11%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

682

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

908

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,152

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,849

1 Year

rr_AverageAnnualReturnYear01

(4.31%)

^[1]

5 Years

rr_AverageAnnualReturnYear05

1.14%

^[1]

Since Inception

rr_AverageAnnualReturnSinceInception

4.43%

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

^[1]

LIVESTRONG 2025 PORTFOLIO | C Class

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.65%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.86%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

189

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

586

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,007

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,177

1 Year

rr_AverageAnnualReturnYear01

0.84%

^[2]

5 Years

rr_AverageAnnualReturnYear05

1.61%

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

4.50%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

^[2]

LIVESTRONG 2025 PORTFOLIO | R CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.65%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.36%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

139

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

431

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

745

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,634

1 Year

rr_AverageAnnualReturnYear01

1.26%

5 Years

rr_AverageAnnualReturnYear05

2.11%

Since Inception

rr_AverageAnnualReturnSinceInception

5.02%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2030 PORTFOLIO

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

LIVESTRONG 2030 PORTFOLIO

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

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 58 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

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 28% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

28.00%

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 58 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

LIVESTRONG 2030 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	63.35%	Fixed-Income Securities (Bond Funds)	31.65%
NT Core Equity Plus Fund	3.25%	High-Yield Fund	3.05%
NT Emerging Markets Fund	3.00%	Inflation-Adjusted Bond Fund	6.10%
NT Equity Growth Fund	9.25%	International Bond Fund	1.50%
NT Growth Fund	11.25%	NT Diversified Bond Fund	21.00%
NT International Growth Fund	8.75%
NT Large Company Value Fund	12.25%	Cash Equivalents (Money Market Funds)	5.00%
NT Mid Cap Value Fund	5.25%	Premium Money Market Fund	5.00%
NT Small Company Fund	3.50%
NT Vista Fund	5.00%
Real Estate Fund	1.85%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (3Q 2009): 12.53%

Lowest Performance Quarter (3Q 2011): -10.33%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 11.48%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

11.48%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

12.53%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(10.33%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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.

LIVESTRONG 2030 PORTFOLIO | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

Since Inception

rr_AverageAnnualReturnSinceInception

(0.55%)

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2030 PORTFOLIO | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

Since Inception

rr_AverageAnnualReturnSinceInception

6.79%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2030 PORTFOLIO | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.67%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.88%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

90

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

281

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

488

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,085

Annual Return 2009

rr_AnnualReturn2009

22.88%

Annual Return 2010

rr_AnnualReturn2010

13.39%

Annual Return 2011

rr_AnnualReturn2011

1.04%

1 Year

rr_AverageAnnualReturnYear01

1.04%

Since Inception

rr_AverageAnnualReturnSinceInception

0.85%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2030 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

0.46%

Since Inception

rr_AverageAnnualReturnSinceInception

0.37%

LIVESTRONG 2030 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

0.86%

Since Inception

rr_AverageAnnualReturnSinceInception

0.50%

LIVESTRONG 2030 PORTFOLIO | INSTITUTIONAL CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

none

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.67%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.68%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

70

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

218

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

379

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

847

1 Year

rr_AverageAnnualReturnYear01

1.24%

Since Inception

rr_AverageAnnualReturnSinceInception

1.02%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2030 PORTFOLIO | A CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.67%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.13%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

684

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

914

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,162

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,870

1 Year

rr_AverageAnnualReturnYear01

(5.04%)

^[1]

Since Inception

rr_AverageAnnualReturnSinceInception

(1.08%)

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

^[1]

LIVESTRONG 2030 PORTFOLIO | C Class

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.67%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.88%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

191

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

592

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,017

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,198

1 Year

rr_AverageAnnualReturnYear01

0.04%

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

(0.16%)

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

^[2]

LIVESTRONG 2030 PORTFOLIO | R CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.67%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.38%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

141

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

438

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

756

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,656

1 Year

rr_AverageAnnualReturnYear01

0.44%

Since Inception

rr_AverageAnnualReturnSinceInception

0.32%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2035 PORTFOLIO

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

LIVESTRONG 2035 PORTFOLIO

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

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 58 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

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 16% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

16.00%

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 58 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

LIVESTRONG 2035 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	70.25%	Fixed-Income Securities (Bond Funds)	25.75%
NT Core Equity Plus Fund	3.25%	High-Yield Fund	2.55%
NT Emerging Markets Fund	3.50%	Inflation-Adjusted Bond Fund	5.20%
NT Equity Growth Fund	9.75%	NT Diversified Bond Fund	18.00%
NT Growth Fund	13.00%
NT International Growth Fund	10.00%	Cash Equivalents (Money Market Funds)	4.00%
NT Large Company Value Fund	13.00%	Premium Money Market Fund	4.00%
NT Mid Cap Value Fund	5.75%
NT Small Company Fund	4.15%
NT Vista Fund	5.75%
Real Estate Fund	2.10%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds.  The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (3Q 2009): 13.46%

Lowest Performance Quarter (4Q 2008): -17.42%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 12.14%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

12.14%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

13.46%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(17.42%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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.

LIVESTRONG 2035 PORTFOLIO | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

5 Years

rr_AverageAnnualReturnYear05

(0.01%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.41%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2035 PORTFOLIO | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

5 Years

rr_AverageAnnualReturnYear05

6.50%

Since Inception

rr_AverageAnnualReturnSinceInception

5.51%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2035 PORTFOLIO | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.71%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.91%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

93

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

291

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

504

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,120

Annual Return 2005

rr_AnnualReturn2005

7.44%

Annual Return 2006

rr_AnnualReturn2006

13.60%

Annual Return 2007

rr_AnnualReturn2007

10.36%

Annual Return 2008

rr_AnnualReturn2008

(30.58%)

Annual Return 2009

rr_AnnualReturn2009

24.31%

Annual Return 2010

rr_AnnualReturn2010

14.28%

Annual Return 2011

rr_AnnualReturn2011

0.37%

1 Year

rr_AverageAnnualReturnYear01

0.37%

5 Years

rr_AverageAnnualReturnYear05

1.78%

Since Inception

rr_AverageAnnualReturnSinceInception

5.53%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2035 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(0.13%)

5 Years

rr_AverageAnnualReturnYear05

1.11%

Since Inception

rr_AverageAnnualReturnSinceInception

4.72%

LIVESTRONG 2035 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

0.40%

5 Years

rr_AverageAnnualReturnYear05

1.20%

Since Inception

rr_AverageAnnualReturnSinceInception

4.42%

LIVESTRONG 2035 PORTFOLIO | INSTITUTIONAL CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

none

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.71%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.71%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

73

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

227

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

396

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

883

1 Year

rr_AverageAnnualReturnYear01

0.57%

5 Years

rr_AverageAnnualReturnYear05

1.98%

Since Inception

rr_AverageAnnualReturnSinceInception

5.75%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2035 PORTFOLIO | A CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.71%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.16%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

687

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

923

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,177

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,903

1 Year

rr_AverageAnnualReturnYear01

(5.60%)

^[1]

5 Years

rr_AverageAnnualReturnYear05

0.32%

^[1]

Since Inception

rr_AverageAnnualReturnSinceInception

4.43%

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

^[1]

LIVESTRONG 2035 PORTFOLIO | C Class

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.71%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.91%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

194

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

601

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,032

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,230

1 Year

rr_AverageAnnualReturnYear01

(0.62%)

^[2]

5 Years

rr_AverageAnnualReturnYear05

0.77%

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

4.48%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

^[2]

LIVESTRONG 2035 PORTFOLIO | R CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.71%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.41%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

144

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

447

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

772

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,690

1 Year

rr_AverageAnnualReturnYear01

(0.21%)

5 Years

rr_AverageAnnualReturnYear05

1.26%

Since Inception

rr_AverageAnnualReturnSinceInception

5.01%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2040 PORTFOLIO

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

LIVESTRONG 2040 PORTFOLIO

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

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 58 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

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 20% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

20.00%

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 58 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

LIVESTRONG 2040 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	76.35%	Fixed-Income Securities (Bond Funds)	22.15%
NT Core Equity Plus Fund	3.75%	High-Yield Fund	2.20%
NT Emerging Markets Fund	4.50%	Inflation-Adjusted Bond Fund	4.40%
NT Equity Growth Fund	10.25%	NT Diversified Bond Fund	15.55%
NT Growth Fund	14.00%
NT International Growth Fund	10.00%	Cash Equivalents (Money Market Funds)	1.50%
NT Large Company Value Fund	14.00%	Premium Money Market Fund	1.50%
NT Mid Cap Value Fund	6.75%
NT Small Company Fund	4.00%
NT Vista Fund	6.75%
Real Estate Fund	2.35%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

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• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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]

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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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

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Highest Performance Quarter (2Q 2009): 14.38%

Lowest Performance Quarter (3Q 2011): -12.68%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 12.93%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

12.93%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

14.38%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(12.68%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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]

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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.

LIVESTRONG 2040 PORTFOLIO | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

Since Inception

rr_AverageAnnualReturnSinceInception

(0.55%)

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2040 PORTFOLIO | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

Since Inception

rr_AverageAnnualReturnSinceInception

6.79%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2040 PORTFOLIO | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.74%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.95%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

97

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

303

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

526

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,166

1 Year

rr_AverageAnnualReturnYear01

(0.27%)

Since Inception

rr_AverageAnnualReturnSinceInception

0.21%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2040 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(0.76%)

Since Inception

rr_AverageAnnualReturnSinceInception

(0.17%)

LIVESTRONG 2040 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

0.03%

Since Inception

rr_AverageAnnualReturnSinceInception

0.02%

LIVESTRONG 2040 PORTFOLIO | INSTITUTIONAL CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

none

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.74%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.75%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

77

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

240

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

417

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

931

Annual Return 2009

rr_AnnualReturn2009

25.95%

Annual Return 2010

rr_AnnualReturn2010

14.99%

Annual Return 2011

rr_AnnualReturn2011

(0.27%)

1 Year

rr_AverageAnnualReturnYear01

(0.07%)

Since Inception

rr_AverageAnnualReturnSinceInception

0.41%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2040 PORTFOLIO | A CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.74%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.20%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

690

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

935

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,197

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,946

1 Year

rr_AverageAnnualReturnYear01

(6.21%)

^[1]

Since Inception

rr_AverageAnnualReturnSinceInception

(1.67%)

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

^[1]

LIVESTRONG 2040 PORTFOLIO | C Class

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.74%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.95%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

198

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

613

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,053

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,272

1 Year

rr_AverageAnnualReturnYear01

(1.26%)

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

(0.81%)

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

^[2]

LIVESTRONG 2040 PORTFOLIO | R CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.74%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.45%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

148

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

459

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

793

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,734

1 Year

rr_AverageAnnualReturnYear01

(0.77%)

Since Inception

rr_AverageAnnualReturnSinceInception

(0.28%)

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2045 PORTFOLIO

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

LIVESTRONG 2045 PORTFOLIO

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

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 58 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

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 14% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

14.00%

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 58 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

LIVESTRONG 2045 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	80.85%	Fixed-Income Securities (Bond Funds)	19.15%
NT Core Equity Plus Fund	4.50%	High-Yield Fund	1.90%
NT Emerging Markets Fund	5.25%	Inflation-Adjusted Bond Fund	3.80%
NT Equity Growth Fund	10.25%	NT Diversified Bond Fund	13.45%
NT Growth Fund	14.75%
NT International Growth Fund	10.00%	Cash Equivalents (Money Market Funds)	0.00%
NT Large Company Value Fund	14.75%
NT Mid Cap Value Fund	7.25%
NT Small Company Fund	4.25%
NT Vista Fund	7.25%
Real Estate Fund	2.60%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (2Q 2009): 14.89%

Lowest Performance Quarter (4Q 2008): -19.49%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 13.28%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

13.28%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

14.89%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.49%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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.

LIVESTRONG 2045 PORTFOLIO | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

5 Years

rr_AverageAnnualReturnYear05

(0.01%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.41%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2045 PORTFOLIO | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

5 Years

rr_AverageAnnualReturnYear05

6.50%

Since Inception

rr_AverageAnnualReturnSinceInception

5.51%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2045 PORTFOLIO | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.78%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.98%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

100

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

313

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

542

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,201

Annual Return 2005

rr_AnnualReturn2005

7.85%

Annual Return 2006

rr_AnnualReturn2006

14.53%

Annual Return 2007

rr_AnnualReturn2007

10.74%

Annual Return 2008

rr_AnnualReturn2008

(33.64%)

Annual Return 2009

rr_AnnualReturn2009

26.36%

Annual Return 2010

rr_AnnualReturn2010

15.50%

Annual Return 2011

rr_AnnualReturn2011

(0.78%)

1 Year

rr_AverageAnnualReturnYear01

(0.78%)

5 Years

rr_AverageAnnualReturnYear05

1.25%

Since Inception

rr_AverageAnnualReturnSinceInception

5.44%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2045 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(1.20%)

5 Years

rr_AverageAnnualReturnYear05

0.64%

Since Inception

rr_AverageAnnualReturnSinceInception

4.68%

LIVESTRONG 2045 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(0.33%)

5 Years

rr_AverageAnnualReturnYear05

0.79%

Since Inception

rr_AverageAnnualReturnSinceInception

4.38%

LIVESTRONG 2045 PORTFOLIO | INSTITUTIONAL CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

none

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.78%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.78%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

80

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

250

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

434

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

966

1 Year

rr_AverageAnnualReturnYear01

(0.58%)

5 Years

rr_AverageAnnualReturnYear05

1.43%

Since Inception

rr_AverageAnnualReturnSinceInception

5.64%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2045 PORTFOLIO | A CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.78%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.23%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

693

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

943

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,212

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,978

1 Year

rr_AverageAnnualReturnYear01

(6.65%)

^[1]

5 Years

rr_AverageAnnualReturnYear05

(0.19%)

^[1]

Since Inception

rr_AverageAnnualReturnSinceInception

4.33%

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

^[1]

LIVESTRONG 2045 PORTFOLIO | C Class

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.78%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.98%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

201

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

622

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,068

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,303

1 Year

rr_AverageAnnualReturnYear01

(1.68%)

^[2]

5 Years

rr_AverageAnnualReturnYear05

0.24%

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

4.38%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

^[2]

LIVESTRONG 2045 PORTFOLIO | R CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.78%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.48%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

151

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

469

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

809

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,767

1 Year

rr_AverageAnnualReturnYear01

(1.27%)

5 Years

rr_AverageAnnualReturnYear05

0.75%

Since Inception

rr_AverageAnnualReturnSinceInception

4.91%

Inception Date

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2004

LIVESTRONG 2050 PORTFOLIO

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

LIVESTRONG 2050 PORTFOLIO

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

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 58 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

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 12% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

12.00%

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 58 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

LIVESTRONG 2050 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	83.35%	Fixed-Income Securities (Bond Funds)	16.65%
NT Core Equity Plus Fund	4.50%	High-Yield Fund	1.65%
NT Emerging Markets Fund	6.25%	Inflation-Adjusted Bond Fund	3.30%
NT Equity Growth Fund	10.50%	NT Diversified Bond Fund	11.70%
NT Growth Fund	15.00%
NT International Growth Fund	9.75%	Cash Equivalents (Money Market Funds)	0.00%
NT Large Company Value Fund	15.25%
NT Mid Cap Value Fund	7.25%
NT Small Company Fund	4.75%
NT Vista Fund	7.25%
Real Estate Fund	2.85%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (2Q 2009): 15.07%

Lowest Performance Quarter (3Q 2011): -14.04%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 13.61%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

13.61%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.07%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(14.04%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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.

LIVESTRONG 2050 PORTFOLIO | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

Since Inception

rr_AverageAnnualReturnSinceInception

(0.55%)

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2050 PORTFOLIO | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

Since Inception

rr_AverageAnnualReturnSinceInception

6.79%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2050 PORTFOLIO | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.79%

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 2009

rr_AnnualReturn2009

26.66%

Annual Return 2010

rr_AnnualReturn2010

15.70%

Annual Return 2011

rr_AnnualReturn2011

(0.96%)

1 Year

rr_AverageAnnualReturnYear01

(0.96%)

Since Inception

rr_AverageAnnualReturnSinceInception

(0.77%)

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2050 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(1.36%)

Since Inception

rr_AverageAnnualReturnSinceInception

(1.08%)

LIVESTRONG 2050 PORTFOLIO | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(0.43%)

Since Inception

rr_AverageAnnualReturnSinceInception

(0.78%)

LIVESTRONG 2050 PORTFOLIO | INSTITUTIONAL CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

none

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.79%

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

(0.77%)

Since Inception

rr_AverageAnnualReturnSinceInception

(0.54%)

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2050 PORTFOLIO | A CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.79%

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

(6.89%)

^[1]

Since Inception

rr_AverageAnnualReturnSinceInception

(2.63%)

^[1]

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

^[1]

LIVESTRONG 2050 PORTFOLIO | C Class

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.79%

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

(1.94%)

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

(1.75%)

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2010

^[2]

LIVESTRONG 2050 PORTFOLIO | R CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

0.01%

Other Expenses

rr_OtherExpensesOverAssets

0.21%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.79%

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

(1.45%)

Since Inception

rr_AverageAnnualReturnSinceInception

(1.23%)

Inception Date

rr_AverageAnnualReturnInceptionDate

May 30, 2008

LIVESTRONG 2055 PORTFOLIO

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

LIVESTRONG 2055 PORTFOLIO

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

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 58 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

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 44% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

44.00%

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 58 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

LIVESTRONG 2055 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	85.00%	Fixed-Income Securities (Bond Funds)	15.00%
NT Core Equity Plus Fund	4.50%	High-Yield Fund	1.50%
NT Emerging Markets Fund	6.50%	Inflation-Adjusted Bond Fund	3.00%
NT Equity Growth Fund	10.75%	NT Diversified Bond Fund	10.50%
NT Growth Fund	15.25%
NT International Growth Fund	9.50%	Cash Equivalents (Money Market Funds)	0.00%
NT Large Company Value Fund	15.50%
NT Mid Cap Value Fund	7.50%
NT Small Company Fund	5.00%
NT Vista Fund	7.50%
Real Estate Fund	3.00%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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 fund’s performance history is not available as of the date of this prospectus. When the fund has investment results for a full calendar year, this section will feature charts that show annual total returns, highest and lowest quarterly returns and average annual total returns for the fund. This information indicates the volatility of the fund’s historical returns from year to year.

Performance information is designed to help you see how fund returns can vary. Keep in mind that past performance (before and after taxes) does not predict how the fund will perform in the future.

For current performance information, please visit americancentury.com.

Performance One Year or Less [Text]

rr_PerformanceOneYearOrLess

The fund's performance history is not available as of the date of this prospectus. When the fund has investment results for a full calendar year, this section will feature charts that show annual total returns, highest and lowest quarterly returns and average annual total returns for the fund.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Keep in mind that past performance (before and after taxes) does not predict how the fund will perform in the future.

LIVESTRONG 2055 PORTFOLIO | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.81%

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

LIVESTRONG 2055 PORTFOLIO | INSTITUTIONAL CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Administrative Fee

rr_Component1OtherExpensesOverAssets

none

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.81%

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

LIVESTRONG 2055 PORTFOLIO | A CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.81%

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

LIVESTRONG 2055 PORTFOLIO | C CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.81%

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

LIVESTRONG 2055 PORTFOLIO | R CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

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

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Administrative Fee

rr_Component1OtherExpensesOverAssets

0.20%

Other

rr_Component2OtherExpensesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.81%

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

ONE CHOICE PORTFOLIO: VERY CONSERVATIVE

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

ONE CHOICE PORTFOLIO: VERY CONSERVATIVE

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

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

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance.  During the most recent fiscal year, the fund’s portfolio turnover rate was 13% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

13.00%

Expense 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

One Choice Portfolio: Very Conservative is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century Investments mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The fund’s asset allocation is intended to diversify investments among stocks, bonds and cash equivalents.

The following table indicates the fund’s neutral mix; that is, how the fund’s investments generally will be allocated among the major asset classes over the long term.

Equity Securities (Stock Funds)	25.00%	Fixed-Income Securities (Bond Funds)	52.00%
Core Equity Plus Fund	1.00%	Diversified Bond Fund	32.00%
Equity Growth Fund	4.00%	Inflation-Adjusted Bond Fund	10.00%
Growth Fund	2.50%	International Bond Fund	10.00%
Large Company Value Fund	8.00%
Mid Cap Value Fund	5.00%	Cash Equivalents (Money Market Funds)	23.00%
Real Estate Fund	2.00%	Prime Money Market Fund	23.00%
Small Company Fund	1.00%
Vista Fund	1.50%

The managers regularly review the fund and may make changes to the fund’s asset class allocations that deviate from the neutral mix to emphasize investments that they believe will provide the most favorable outlook for achieving the fund’s objective. The fund also may deviate from the neutral mix due to differences in asset class performance or prevailing market conditions. The following table shows the operating ranges within which the fund’s asset class allocations generally will vary over short-term periods.

	Equity Securities (Stock Funds)	Fixed-Income Securities (Bond Funds)	Cash Equivalents (Money Market Funds)
Operating Ranges	20-30%	45-55%	15-35%

However, in light of the current extreme low interest rate environment for cash equivalent (money market) securities, the managers intend to reallocate a portion of the fund’s assets from money market funds to short-term bond funds effective January 4, 2013.  This shift will cause the fund to temporarily deviate from the neutral mix and operating ranges listed above.  During this period, the fund’s investments generally will be allocated as indicated in the following table, subject to any further adjustments deemed appropriate by the managers in light of changing market conditions.

Equity Securities (Stock Funds)	25.00%	Fixed-Income Securities (Bond Funds)	67.00%
Core Equity Plus Fund	1.00%	Diversified Bond Fund	32.00%
Equity Growth Fund	4.00%	Inflation-Adjusted Bond Fund	10.00%
Growth Fund	2.50%	International Bond Fund	10.00%
Large Company Value Fund	8.00%	Short Duration Fund	7.00%
Mid Cap Value Fund	5.00%	Short Duration Inflation Protection Bond Fund	8.00%
Real Estate Fund	2.00%
Small Company Fund	1.00%	Cash Equivalents (Money Market Funds)	8.00%
Vista Fund	1.50%	Prime Money Market Fund	8.00%

Over the long term, the managers expect to reallocate the fund’s assets back toward the neutral mix.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Allocation Risk – The fund’s ability to achieve its investment objective depends in part on the managers’ skill in determining the funds’ asset class allocations and in selecting and weighting the underlying funds. The managers’ evaluations and assumptions regarding asset classes and underlying funds may differ from actual market conditions.

• Market Risk – The value of the fund’s shares will go up and down based on the performance of the underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own and other factors generally affecting the securities market.

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by the inability or perceived inability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price.

• 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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (3Q 2009) 6.20%

Lowest Performance Quarter (4Q 2008) -3.97%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 6.44%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

6.44%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

6.20%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.97%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

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.

ONE CHOICE PORTFOLIO: VERY CONSERVATIVE | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

5 Years

rr_AverageAnnualReturnYear05

(0.01%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.24%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: VERY CONSERVATIVE | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

5 Years

rr_AverageAnnualReturnYear05

6.50%

Since Inception

rr_AverageAnnualReturnSinceInception

5.54%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: VERY CONSERVATIVE | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.62%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

63

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

199

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

346

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

775

Annual Return 2005

rr_AnnualReturn2005

2.40%

Annual Return 2006

rr_AnnualReturn2006

7.50%

Annual Return 2007

rr_AnnualReturn2007

5.77%

Annual Return 2008

rr_AnnualReturn2008

(6.66%)

Annual Return 2009

rr_AnnualReturn2009

10.59%

Annual Return 2010

rr_AnnualReturn2010

6.84%

Annual Return 2011

rr_AnnualReturn2011

4.88%

1 Year

rr_AverageAnnualReturnYear01

4.88%

5 Years

rr_AverageAnnualReturnYear05

4.12%

Since Inception

rr_AverageAnnualReturnSinceInception

4.74%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: VERY CONSERVATIVE | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.10%

5 Years

rr_AverageAnnualReturnYear05

3.09%

Since Inception

rr_AverageAnnualReturnSinceInception

3.60%

ONE CHOICE PORTFOLIO: VERY CONSERVATIVE | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.24%

5 Years

rr_AverageAnnualReturnYear05

2.95%

Since Inception

rr_AverageAnnualReturnSinceInception

3.43%

ONE CHOICE PORTFOLIO: CONSERVATIVE

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

ONE CHOICE PORTFOLIO: CONSERVATIVE

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

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

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 12% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

12.00%

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

One Choice Portfolio: Conservative is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century Investments mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The fund’s asset allocation is intended to diversify investments among stocks, bonds and cash equivalents.

The following table indicates the fund’s neutral mix; that is, how the fund’s investments generally will be allocated among the major asset classes over the long term. The table also shows the neutral weightings of each underlying fund currently being used within the various asset classes. This information is as of the date of this prospectus.

Equity Securities (Stock Funds)	45.00%	Fixed-Income Securities (Bond Funds)	47.00%
Core Equity Plus Fund	2.00%	Diversified Bond Fund	30.00%
Equity Growth Fund	7.00%	Inflation-Adjusted Bond Fund	9.00%
Growth Fund	4.75%	International Bond Fund	8.00%
International Growth Fund	6.00%
Large Company Value Fund	11.00%	Cash Equivalents (Money Market Funds)	8.00%
Mid Cap Value Fund	6.75%	Prime Money Market Fund	8.00%
Real Estate Fund	2.00%
Small Company Fund	1.50%
Vista Fund	4.00%

The managers regularly review the fund and may make changes to the fund’s asset class allocations that deviate from the neutral mix to emphasize investments that they believe will provide the most favorable outlook for achieving the fund’s objective. The fund also may deviate from the neutral mix due to differences in asset class performance or prevailing market conditions. The following table shows the operating ranges within which the fund’s asset class allocations generally will vary over short-term periods.

	Equity Securities (Stock Funds)	Fixed-Income Securities (Bond Funds)	Cash Equivalents (Money Market Funds)
Operating Ranges	39-51%	38-52%	5-20%

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Allocation Risk – The fund’s ability to achieve its investment objective depends in part on the managers’ skill in determining the funds’ asset class allocations and in selecting and weighting the underlying funds. The managers’ evaluations and assumptions regarding asset classes and underlying funds may differ from actual market conditions.

• Market Risk – The value of the fund’s shares will go up and down based on the performance of the underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own and other factors generally affecting the securities market.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by the inability or perceived inability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price.

• 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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (3Q 2009) 9.27%

Lowest Performance Quarter (4Q 2008) -8.82%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 9.11%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

9.11%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

9.27%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(8.82%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

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.

ONE CHOICE PORTFOLIO: CONSERVATIVE | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

5 Years

rr_AverageAnnualReturnYear05

(0.01%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.24%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: CONSERVATIVE | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

5 Years

rr_AverageAnnualReturnYear05

6.50%

Since Inception

rr_AverageAnnualReturnSinceInception

5.54%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: CONSERVATIVE | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.76%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.76%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

78

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

243

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

423

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

943

Annual Return 2005

rr_AnnualReturn2005

3.79%

Annual Return 2006

rr_AnnualReturn2006

10.05%

Annual Return 2007

rr_AnnualReturn2007

7.05%

Annual Return 2008

rr_AnnualReturn2008

(16.03%)

Annual Return 2009

rr_AnnualReturn2009

15.81%

Annual Return 2010

rr_AnnualReturn2010

9.86%

Annual Return 2011

rr_AnnualReturn2011

3.76%

1 Year

rr_AverageAnnualReturnYear01

3.76%

5 Years

rr_AverageAnnualReturnYear05

3.48%

Since Inception

rr_AverageAnnualReturnSinceInception

5.10%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: CONSERVATIVE | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.03%

5 Years

rr_AverageAnnualReturnYear05

2.50%

Since Inception

rr_AverageAnnualReturnSinceInception

4.05%

ONE CHOICE PORTFOLIO: CONSERVATIVE | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.55%

5 Years

rr_AverageAnnualReturnYear05

2.47%

Since Inception

rr_AverageAnnualReturnSinceInception

3.84%

ONE CHOICE PORTFOLIO: MODERATE

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

ONE CHOICE PORTFOLIO: MODERATE

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

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

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 16% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

16.00%

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

One Choice Portfolio: Moderate is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century Investments mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The fund’s asset allocation is intended to diversify investments among stocks, bonds and cash equivalents.

The following table indicates the fund’s neutral mix; that is, how the fund’s investments generally will be allocated among the major asset classes over the long term. The table also shows the neutral weightings of each underlying fund currently being used within the various asset classes. This information is as of the date of this prospectus.

Equity Securities (Stock Funds)	64.00%	Fixed-Income Securities (Bond Funds)	31.00%
Core Equity Plus Fund	4.00%	Diversified Bond Fund	19.00%
Emerging Markets Fund	4.00%	High-Yield Fund	3.00%
Equity Growth Fund	12.00%	Inflation-Adjusted Bond Fund	6.00%
Growth Fund	8.00%	International Bond Fund	3.00%
International Growth Fund	10.00%
Large Company Value Fund	9.50%	Cash Equivalents (Money Market Funds)	5.00%
Mid Cap Value Fund	5.50%	Prime Money Market Fund	5.00%
Real Estate Fund	2.00%
Small Company Fund	2.00%
Vista Fund	7.00%

The managers regularly review the fund and may make changes to the fund’s asset class allocations that deviate from the neutral mix to emphasize investments that they believe will provide the most favorable outlook for achieving the fund’s objective. The fund also may deviate from the neutral mix due to differences in asset class performance or prevailing market conditions. The following table shows the operating ranges within which the fund’s asset class allocations generally will vary over short-term periods.

	Equity Securities (Stock Funds)	Fixed-Income Securities (Bond Funds)	Cash Equivalents (Money Market Funds)
Operating Ranges	53-73%	21-41%	0-15%

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Allocation Risk – The fund’s ability to achieve its investment objective depends in part on the managers’ skill in determining the funds’ asset class allocations and in selecting and weighting the underlying funds. The managers’ evaluations and assumptions regarding asset classes and underlying funds may differ from actual market conditions.

• Market Risk – The value of the fund’s shares will go up and down based on the performance of the underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own and other factors generally affecting the securities market.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by the inability or perceived inability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• 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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter(3Q 2009) 11.86%

Lowest Performance Quarter (4Q 2008) -14.20%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 11.65%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

11.65%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

11.86%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(14.20%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

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.

ONE CHOICE PORTFOLIO: MODERATE | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

5 Years

rr_AverageAnnualReturnYear05

(0.01%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.24%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: MODERATE | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

5 Years

rr_AverageAnnualReturnYear05

6.50%

Since Inception

rr_AverageAnnualReturnSinceInception

5.54%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: MODERATE | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.89%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.90%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

92

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

287

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

499

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,108

Annual Return 2005

rr_AnnualReturn2005

6.59%

Annual Return 2006

rr_AnnualReturn2006

12.90%

Annual Return 2007

rr_AnnualReturn2007

9.82%

Annual Return 2008

rr_AnnualReturn2008

(25.92%)

Annual Return 2009

rr_AnnualReturn2009

21.76%

Annual Return 2010

rr_AnnualReturn2010

12.74%

Annual Return 2011

rr_AnnualReturn2011

0.88%

1 Year

rr_AverageAnnualReturnYear01

0.88%

5 Years

rr_AverageAnnualReturnYear05

2.41%

Since Inception

rr_AverageAnnualReturnSinceInception

5.39%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: MODERATE | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

0.31%

5 Years

rr_AverageAnnualReturnYear05

1.55%

Since Inception

rr_AverageAnnualReturnSinceInception

4.47%

ONE CHOICE PORTFOLIO: MODERATE | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

0.70%

5 Years

rr_AverageAnnualReturnYear05

1.66%

Since Inception

rr_AverageAnnualReturnSinceInception

4.21%

ONE CHOICE PORTFOLIO: AGGRESSIVE

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

ONE CHOICE PORTFOLIO: AGGRESSIVE

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

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

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 14% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

14.00%

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

One Choice Portfolio: Aggressive is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century Investments mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The fund’s asset allocation is intended to diversify investments among stocks, bonds and cash equivalents.

The following table indicates the fund’s neutral mix; that is, how the fund’s investments generally will be allocated among the major asset classes over the long term. The table also shows the neutral weightings of each underlying fund currently being used within the various asset classes. This information is as of the date of this prospectus.

Equity Securities (Stock Funds)	79.00%	Fixed-Income Securities (Bond Funds)	20.00%
Core Equity Plus Fund	4.50%	Diversified Bond Fund	11.00%
Emerging Markets Fund	6.50%	High-Yield Fund	5.00%
Equity Growth Fund	10.00%	Inflation-Adjusted Bond Fund	4.00%
Growth Fund	14.50%
International Growth Fund	12.50%	Cash Equivalents (Money Market Funds)	1.00%
Large Company Value Fund	8.50%	Prime Money Market Fund	1.00%
Mid Cap Value Fund	4.75%
Real Estate Fund	2.00%
Small Company Fund	2.25%
Vista Fund	13.50%

The managers regularly review the fund and may make changes to the fund’s asset class allocations that deviate from the neutral mix to emphasize investments that they believe will provide the most favorable outlook for achieving the fund’s objective. The fund also may deviate from the neutral mix due to differences in asset class performance or prevailing market conditions. The following table shows the operating ranges within which the fund’s asset class allocations generally will vary over short-term periods.

	Equity Securities (Stock Funds)	Fixed-Income Securities (Bond Funds)	Cash Equivalents (Money Market Funds)
Operating Ranges	60-90%	10-30%	0-15%

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Allocation Risk – The fund’s ability to achieve its investment objective depends in part on the managers’ skill in determining the funds’ asset class allocations and in selecting and weighting the underlying funds. The managers’ evaluations and assumptions regarding asset classes and underlying funds may differ from actual market conditions.

• Market Risk – The value of the fund’s shares will go up and down based on the performance of the underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own and other factors generally affecting the securities market.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by the inability or perceived inability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• 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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (3Q 2009) 13.90%

Lowest Performance Quarter (4Q 2008) -18.80%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 13.46%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

13.46%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

13.90%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(18.80%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historcal highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historcal 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.

ONE CHOICE PORTFOLIO: AGGRESSIVE | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

5 Years

rr_AverageAnnualReturnYear05

(0.01%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.24%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: AGGRESSIVE | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

5 Years

rr_AverageAnnualReturnYear05

6.50%

Since Inception

rr_AverageAnnualReturnSinceInception

5.54%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: AGGRESSIVE | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.01%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

1.00%

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

8.54%

Annual Return 2006

rr_AnnualReturn2006

14.41%

Annual Return 2007

rr_AnnualReturn2007

13.65%

Annual Return 2008

rr_AnnualReturn2008

(33.87%)

Annual Return 2009

rr_AnnualReturn2009

26.68%

Annual Return 2010

rr_AnnualReturn2010

15.59%

Annual Return 2011

rr_AnnualReturn2011

(1.68%)

1 Year

rr_AverageAnnualReturnYear01

(1.68%)

5 Years

rr_AverageAnnualReturnYear05

1.59%

Since Inception

rr_AverageAnnualReturnSinceInception

5.41%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: AGGRESSIVE | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(2.13%)

5 Years

rr_AverageAnnualReturnYear05

0.82%

Since Inception

rr_AverageAnnualReturnSinceInception

4.60%

ONE CHOICE PORTFOLIO: AGGRESSIVE | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(0.97%)

5 Years

rr_AverageAnnualReturnYear05

1.03%

Since Inception

rr_AverageAnnualReturnSinceInception

4.32%

ONE CHOICE PORTFOLIO: VERY AGGRESSIVE

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

ONE CHOICE PORTFOLIO: VERY AGGRESSIVE

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return consistent with its asset mix.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

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

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance.  During the most recent fiscal year, the fund’s portfolio turnover rate was 13% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

13.00%

Expense 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

One Choice Portfolio: Very Aggressive is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century Investments mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The fund’s asset allocation is intended to diversify investments among stocks, bonds and cash equivalents.

The following table indicates the fund’s neutral mix; that is, how the fund’s investments generally will be allocated among the major asset classes over the long term. The table also shows the neutral weightings of each underlying fund currently being used within the various asset classes. This information is as of the date of this prospectus.

Equity Securities (Stock Funds)	96.00%	Fixed-Income Securities (Bond Funds)	3.00%
Core Equity Plus Fund	4.75%	Diversified Bond Fund	3.00%
Emerging Markets Fund	7.50%
Equity Growth Fund	13.00%
Growth Fund	17.75%	Cash Equivalents (Money Market Funds)	1.00%
International Growth Fund	15.50%	Prime Money Market Fund	1.00%
Large Company Value Fund	10.50%
Mid Cap Value Fund	6.00%
Real Estate Fund	2.00%
Small Company Fund	2.50%
Vista Fund	16.50%

The managers regularly review the fund and may make changes to the fund’s asset class allocations that deviate from the neutral mix to emphasize investments that they believe will provide the most favorable outlook for achieving the fund’s objective. The fund also may deviate from the neutral mix due to differences in asset class performance or prevailing market conditions. The following table shows the operating ranges within which the fund’s asset class allocations generally will vary over short-term periods.

	Equity Securities (Stock Funds)	Fixed-Income Securities (Bond Funds)	Cash Equivalents (Money Market Funds)
Operating Ranges	75-100%	0-10%	0-15%

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Allocation Risk – The fund’s ability to achieve its investment objective depends in part on the managers’ skill in determining the funds’ asset class allocations and in selecting and weighting the underlying funds. The managers’ evaluations and assumptions regarding asset classes and underlying funds may differ from actual market conditions.

• Market Risk – The value of the fund’s shares will go up and down based on the performance of the underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own and other factors generally affecting the securities market.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Foreign Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• 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, including yields, please visit americancentury.com.

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (3Q 2009) 15.67%

Lowest Performance Quarter (4Q 2008) -22.24%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 14.71%.

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

14.71%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.67%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.24%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

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

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

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.

ONE CHOICE PORTFOLIO: VERY AGGRESSIVE | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.03%

5 Years

rr_AverageAnnualReturnYear05

(0.01%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.24%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: VERY AGGRESSIVE | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

5 Years

rr_AverageAnnualReturnYear05

6.50%

Since Inception

rr_AverageAnnualReturnSinceInception

5.54%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: VERY AGGRESSIVE | INVESTOR CLASS

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumAccountFee

25

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

1.07%

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

Annual Return 2005

rr_AnnualReturn2005

9.58%

Annual Return 2006

rr_AnnualReturn2006

16.40%

Annual Return 2007

rr_AnnualReturn2007

15.08%

Annual Return 2008

rr_AnnualReturn2008

(39.69%)

Annual Return 2009

rr_AnnualReturn2009

28.59%

Annual Return 2010

rr_AnnualReturn2010

16.70%

Annual Return 2011

rr_AnnualReturn2011

(3.78%)

1 Year

rr_AverageAnnualReturnYear01

(3.78%)

5 Years

rr_AverageAnnualReturnYear05

0.04%

Since Inception

rr_AverageAnnualReturnSinceInception

4.91%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 30, 2004

ONE CHOICE PORTFOLIO: VERY AGGRESSIVE | INVESTOR CLASS | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(3.97%)

5 Years

rr_AverageAnnualReturnYear05

(0.49%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.31%

ONE CHOICE PORTFOLIO: VERY AGGRESSIVE | INVESTOR CLASS | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(2.30%)

5 Years

rr_AverageAnnualReturnYear05

(0.12%)

Since Inception

rr_AverageAnnualReturnSinceInception

4.04%

[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.

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LIVESTRONG INCOME PORTFOLIO

LIVESTRONG INCOME PORTFOLIO

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 58 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 LIVESTRONG INCOME PORTFOLIO (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 LIVESTRONG INCOME PORTFOLIO	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C Class	R CLASS
Management Fee	none	none	none	none	none
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Administrative Fee	0.20%	none	0.20%	0.20%	0.20%
Other	none	none	none	none	none
Other Expenses	0.20%	none	0.20%	0.20%	0.20%
Acquired Fund Fees and Expenses	0.57%	0.57%	0.57%	0.57%	0.57%
Total Annual Fund Operating Expenses	0.77%	0.57%	1.02%	1.77%	1.27%

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 LIVESTRONG INCOME PORTFOLIO (USD $)	1 year	3 years	5 years	10 years
INVESTOR CLASS	79	246	428	955
INSTITUTIONAL CLASS	58	183	319	714
A CLASS	673	882	1,106	1,751
C Class	180	558	960	2,082
R CLASS	130	403	698	1,533

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 28% of the average value of its portfolio.

Principal Investment Strategies

LIVESTRONG Income Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	45.00%	Fixed-Income Securities (Bond Funds)	45.00%
NT Core Equity Plus Fund	3.00%	High-Yield Fund	3.80%
NT Equity Growth Fund	10.00%	Inflation-Adjusted Bond Fund	7.60%
NT Growth Fund	6.50%	International Bond Fund	7.00%
NT International Growth Fund	5.00%	NT Diversified Bond Fund	26.60%
NT Large Company Value Fund	11.00%
NT Mid Cap Value Fund	4.00%	Cash Equivalents (Money Market Funds)	10.00%
NT Small Company Fund	2.00%	Premium Money Market Fund	10.00%
NT Vista Fund	2.50%
Real Estate Fund	1.00%

The target asset mix of LIVESTRONG Income Portfolio is expected to remain fixed over time. The fund is generally intended for investors near to, at, or in retirement and who likely are no longer making new investments in the fund. The fund is designed for investors who plan to gradually withdraw the value of their account after retirement. The fund assumes a retirement age of 65 and may not be appropriate for an investor retiring at an age well before or after age 65.

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds, we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Principal Risks

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities.  Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, 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): 9.30%

Lowest Performance Quarter (4Q 2008): -9.20%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 9.35%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns LIVESTRONG INCOME PORTFOLIO		1 Year	5 Years	Since Inception	Inception Date
INVESTOR CLASS		3.58%	3.48%	4.82%	Aug. 31, 2004
INVESTOR CLASS After Taxes on Distributions		2.83%	2.55%	3.75%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		2.45%	2.48%	3.57%
INSTITUTIONAL CLASS		3.78%	3.69%	5.03%	Aug. 31, 2004
A CLASS	[1]	(2.60%)	2.00%	3.72%	Aug. 31, 2004
C Class	[2]	2.46%	2.43%	3.76%	Mar. 01, 2010
R CLASS		2.97%	2.96%	4.28%	Aug. 31, 2004
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)		1.03%	(0.01%)	4.41%	Aug. 31, 2004
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)		7.84%	6.50%	5.51%	Aug. 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.

LIVESTRONG 2015 PORTFOLIO

LIVESTRONG 2015 PORTFOLIO

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

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 58 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 LIVESTRONG 2015 PORTFOLIO (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 LIVESTRONG 2015 PORTFOLIO	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C Class	R CLASS
Management Fee	none	none	none	none	none
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Administrative Fee	0.20%	none	0.20%	0.20%	0.20%
Other	0.01%	0.01%	0.01%	0.01%	0.01%
Other Expenses	0.21%	0.01%	0.21%	0.21%	0.21%
Acquired Fund Fees and Expenses	0.59%	0.59%	0.59%	0.59%	0.59%
Total Annual Fund Operating Expenses	0.80%	0.60%	1.05%	1.80%	1.30%

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 LIVESTRONG 2015 PORTFOLIO (USD $)	1 year	3 years	5 years	10 years
INVESTOR CLASS	82	256	445	990
INSTITUTIONAL CLASS	61	193	335	751
A CLASS	676	890	1,122	1,784
C Class	183	567	976	2,114
R CLASS	133	413	714	1,567

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 19% of the average value of its portfolio.

Principal Investment Strategies

LIVESTRONG 2015 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	46.85%	Fixed-Income Securities (Bond Funds)	44.15%
NT Core Equity Plus Fund	3.00%	High-Yield Fund	3.75%
NT Emerging Markets Fund	0.50%	Inflation-Adjusted Bond Fund	7.50%
NT Equity Growth Fund	9.75%	International Bond Fund	6.65%
NT Growth Fund	7.00%	NT Diversified Bond Fund	26.25%
NT International Growth Fund	5.25%
NT Large Company Value Fund	11.00%	Cash Equivalents (Money Market Funds)	9.00%
NT Mid Cap Value Fund	4.25%	Premium Money Market Fund	9.00%
NT Small Company Fund	2.00%
NT Vista Fund	3.00%
Real Estate Fund	1.10%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund.  The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Principal Risks

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, 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): 10.20%

Lowest Performance Quarter (4Q 2008): -11.00%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 9.75%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns LIVESTRONG 2015 PORTFOLIO		1 Year	5 Years	Since Inception	Inception Date
INVESTOR CLASS		3.16%	3.23%	5.37%	Aug. 31, 2004
INVESTOR CLASS After Taxes on Distributions		2.46%	2.33%	4.38%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		2.18%	2.28%	4.13%
INSTITUTIONAL CLASS		3.36%	3.45%	5.59%	Aug. 31, 2004
A CLASS	[1]	(3.05%)	1.75%	4.27%	Aug. 31, 2004
C Class	[2]	2.13%	2.20%	4.32%	Mar. 01, 2010
R CLASS		2.65%	2.71%	4.85%	Aug. 31, 2004
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)		1.03%	(0.01%)	4.41%	Aug. 31, 2004
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)		7.84%	6.50%	5.51%	Aug. 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.

LIVESTRONG 2020 PORTFOLIO

LIVESTRONG 2020 PORTFOLIO

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

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 58 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 LIVESTRONG 2020 PORTFOLIO (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 LIVESTRONG 2020 PORTFOLIO	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C Class	R CLASS
Management Fee	none	none	none	none	none
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Administrative Fee	0.20%	none	0.20%	0.20%	0.20%
Other	0.01%	0.01%	0.01%	0.01%	0.01%
Other Expenses	0.21%	0.01%	0.21%	0.21%	0.21%
Acquired Fund Fees and Expenses	0.62%	0.62%	0.62%	0.62%	0.62%
Total Annual Fund Operating Expenses	0.83%	0.63%	1.08%	1.83%	1.33%

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 LIVESTRONG 2020 PORTFOLIO (USD $)	1 year	3 years	5 years	10 years
INVESTOR CLASS	85	265	461	1,026
INSTITUTIONAL CLASS	65	202	352	787
A CLASS	679	899	1,137	1,816
C Class	186	576	991	2,145
R CLASS	136	422	730	1,601

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 28% of the average value of its portfolio.

Principal Investment Strategies

LIVESTRONG 2020 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	52.10%	Fixed-Income Securities (Bond Funds)	41.40%
NT Core Equity Plus Fund	3.00%	High-Yield Fund	3.60%
NT Emerging Markets Fund	1.75%	Inflation-Adjusted Bond Fund	7.20%
NT Equity Growth Fund	9.50%	International Bond Fund	5.60%
NT Growth Fund	8.00%	NT Diversified Bond Fund	25.00%
NT International Growth Fund	6.25%
NT Large Company Value Fund	11.25%	Cash Equivalents (Money Market Funds)	6.50%
NT Mid Cap Value Fund	5.00%	Premium Money Market Fund	6.50%
NT Small Company Fund	2.00%
NT Vista Fund	4.00%
Real Estate Fund	1.35%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Principal Risks

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, 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): 11.07%

Lowest Performance Quarter (3Q 2011): -8.06%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 10.36%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns LIVESTRONG 2020 PORTFOLIO		1 Year	Since Inception	Inception Date
INVESTOR CLASS		2.50%	2.00%	May 30, 2008
INVESTOR CLASS After Taxes on Distributions		1.78%	1.38%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		1.81%	1.39%
INSTITUTIONAL CLASS		2.71%	2.21%	May 30, 2008
A CLASS	[1]	(3.66%)	0.08%	May 30, 2008
C Class	[2]	1.58%	1.01%	Mar. 01, 2010
R CLASS		1.99%	1.49%	May 30, 2008
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)		1.03%	(0.55%)	May 30, 2008
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)		7.84%	6.79%	May 30, 2008

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.

LIVESTRONG 2025 PORTFOLIO

LIVESTRONG 2025 PORTFOLIO

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

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 58 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 LIVESTRONG 2025 PORTFOLIO (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 LIVESTRONG 2025 PORTFOLIO	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C Class	R CLASS
Management Fee	none	none	none	none	none
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Administrative Fee	0.20%	none	0.20%	0.20%	0.20%
Other	0.01%	0.01%	0.01%	0.01%	0.01%
Other Expenses	0.21%	0.01%	0.21%	0.21%	0.21%
Acquired Fund Fees and Expenses	0.65%	0.65%	0.65%	0.65%	0.65%
Total Annual Fund Operating Expenses	0.86%	0.66%	1.11%	1.86%	1.36%

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 LIVESTRONG 2025 PORTFOLIO (USD $)	1 year	3 years	5 years	10 years
INVESTOR CLASS	88	275	477	1,061
INSTITUTIONAL CLASS	68	212	368	823
A CLASS	682	908	1,152	1,849
C Class	189	586	1,007	2,177
R CLASS	139	431	745	1,634

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 21% of the average value of its portfolio.

Principal Investment Strategies

LIVESTRONG 2025 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	57.35%	Fixed-Income Securities (Bond Funds)	37.65%
NT Core Equity Plus Fund	3.00%	High-Yield Fund	3.40%
NT Emerging Markets Fund	2.50%	Inflation-Adjusted Bond Fund	6.75%
NT Equity Growth Fund	9.25%	International Bond Fund	4.00%
NT Growth Fund	9.50%	NT Diversified Bond Fund	23.50%
NT International Growth Fund	7.25%
NT Large Company Value Fund	11.50%	Cash Equivalents (Money Market Funds)	5.00%
NT Mid Cap Value Fund	5.50%	Premium Money Market Fund	5.00%
NT Small Company Fund	2.60%
NT Vista Fund	4.65%
Real Estate Fund	1.60%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Principal Risks

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, 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): 11.70%

Lowest Performance Quarter (4Q 2008): -13.92%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 10.95%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns LIVESTRONG 2025 PORTFOLIO		1 Year	5 Years	Since Inception	Inception Date
INVESTOR CLASS		1.77%	2.62%	5.55%	Aug. 31, 2004
INVESTOR CLASS After Taxes on Distributions		1.14%	1.82%	4.61%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		1.29%	1.83%	4.34%
INSTITUTIONAL CLASS		1.97%	2.81%	5.75%	Aug. 31, 2004
A CLASS	[1]	(4.31%)	1.14%	4.43%	Aug. 31, 2004
C Class	[2]	0.84%	1.61%	4.50%	Mar. 01, 2010
R CLASS		1.26%	2.11%	5.02%	Aug. 31, 2004
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)		1.03%	(0.01%)	4.41%	Aug. 31, 2004
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)		7.84%	6.50%	5.51%	Aug. 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.

LIVESTRONG 2030 PORTFOLIO

LIVESTRONG 2030 PORTFOLIO

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

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 58 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 LIVESTRONG 2030 PORTFOLIO (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 LIVESTRONG 2030 PORTFOLIO	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C Class	R CLASS
Management Fee	none	none	none	none	none
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Administrative Fee	0.20%	none	0.20%	0.20%	0.20%
Other	0.01%	0.01%	0.01%	0.01%	0.01%
Other Expenses	0.21%	0.01%	0.21%	0.21%	0.21%
Acquired Fund Fees and Expenses	0.67%	0.67%	0.67%	0.67%	0.67%
Total Annual Fund Operating Expenses	0.88%	0.68%	1.13%	1.88%	1.38%

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 LIVESTRONG 2030 PORTFOLIO (USD $)	1 year	3 years	5 years	10 years
INVESTOR CLASS	90	281	488	1,085
INSTITUTIONAL CLASS	70	218	379	847
A CLASS	684	914	1,162	1,870
C Class	191	592	1,017	2,198
R CLASS	141	438	756	1,656

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 28% of the average value of its portfolio.

Principal Investment Strategies

LIVESTRONG 2030 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	63.35%	Fixed-Income Securities (Bond Funds)	31.65%
NT Core Equity Plus Fund	3.25%	High-Yield Fund	3.05%
NT Emerging Markets Fund	3.00%	Inflation-Adjusted Bond Fund	6.10%
NT Equity Growth Fund	9.25%	International Bond Fund	1.50%
NT Growth Fund	11.25%	NT Diversified Bond Fund	21.00%
NT International Growth Fund	8.75%
NT Large Company Value Fund	12.25%	Cash Equivalents (Money Market Funds)	5.00%
NT Mid Cap Value Fund	5.25%	Premium Money Market Fund	5.00%
NT Small Company Fund	3.50%
NT Vista Fund	5.00%
Real Estate Fund	1.85%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Principal Risks

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, 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): 12.53%

Lowest Performance Quarter (3Q 2011): -10.33%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 11.48%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns LIVESTRONG 2030 PORTFOLIO		1 Year	Since Inception	Inception Date
INVESTOR CLASS		1.04%	0.85%	May 30, 2008
INVESTOR CLASS After Taxes on Distributions		0.46%	0.37%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		0.86%	0.50%
INSTITUTIONAL CLASS		1.24%	1.02%	May 30, 2008
A CLASS	[1]	(5.04%)	(1.08%)	May 30, 2008
C Class	[2]	0.04%	(0.16%)	Mar. 01, 2010
R CLASS		0.44%	0.32%	May 30, 2008
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)		1.03%	(0.55%)	May 30, 2008
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)		7.84%	6.79%	May 30, 2008

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.

LIVESTRONG 2035 PORTFOLIO

LIVESTRONG 2035 PORTFOLIO

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

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 58 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 LIVESTRONG 2035 PORTFOLIO (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 LIVESTRONG 2035 PORTFOLIO	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C Class	R CLASS
Management Fee	none	none	none	none	none
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Administrative Fee	0.20%	none	0.20%	0.20%	0.20%
Other	none	none	none	none	none
Other Expenses	0.20%	none	0.20%	0.20%	0.20%
Acquired Fund Fees and Expenses	0.71%	0.71%	0.71%	0.71%	0.71%
Total Annual Fund Operating Expenses	0.91%	0.71%	1.16%	1.91%	1.41%

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 LIVESTRONG 2035 PORTFOLIO (USD $)	1 year	3 years	5 years	10 years
INVESTOR CLASS	93	291	504	1,120
INSTITUTIONAL CLASS	73	227	396	883
A CLASS	687	923	1,177	1,903
C Class	194	601	1,032	2,230
R CLASS	144	447	772	1,690

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 16% of the average value of its portfolio.

Principal Investment Strategies

LIVESTRONG 2035 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	70.25%	Fixed-Income Securities (Bond Funds)	25.75%
NT Core Equity Plus Fund	3.25%	High-Yield Fund	2.55%
NT Emerging Markets Fund	3.50%	Inflation-Adjusted Bond Fund	5.20%
NT Equity Growth Fund	9.75%	NT Diversified Bond Fund	18.00%
NT Growth Fund	13.00%
NT International Growth Fund	10.00%	Cash Equivalents (Money Market Funds)	4.00%
NT Large Company Value Fund	13.00%	Premium Money Market Fund	4.00%
NT Mid Cap Value Fund	5.75%
NT Small Company Fund	4.15%
NT Vista Fund	5.75%
Real Estate Fund	2.10%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds.  The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Principal Risks

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, 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): 13.46%

Lowest Performance Quarter (4Q 2008): -17.42%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 12.14%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns LIVESTRONG 2035 PORTFOLIO		1 Year	5 Years	Since Inception	Inception Date
INVESTOR CLASS		0.37%	1.78%	5.53%	Aug. 31, 2004
INVESTOR CLASS After Taxes on Distributions		(0.13%)	1.11%	4.72%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		0.40%	1.20%	4.42%
INSTITUTIONAL CLASS		0.57%	1.98%	5.75%	Aug. 31, 2004
A CLASS	[1]	(5.60%)	0.32%	4.43%	Aug. 31, 2004
C Class	[2]	(0.62%)	0.77%	4.48%	Mar. 01, 2010
R CLASS		(0.21%)	1.26%	5.01%	Aug. 31, 2004
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)		1.03%	(0.01%)	4.41%	Aug. 31, 2004
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)		7.84%	6.50%	5.51%	Aug. 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.

LIVESTRONG 2040 PORTFOLIO

LIVESTRONG 2040 PORTFOLIO

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

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 58 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 LIVESTRONG 2040 PORTFOLIO (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 LIVESTRONG 2040 PORTFOLIO	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C Class	R CLASS
Management Fee	none	none	none	none	none
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Administrative Fee	0.20%	none	0.20%	0.20%	0.20%
Other	0.01%	0.01%	0.01%	0.01%	0.01%
Other Expenses	0.21%	0.01%	0.21%	0.21%	0.21%
Acquired Fund Fees and Expenses	0.74%	0.74%	0.74%	0.74%	0.74%
Total Annual Fund Operating Expenses	0.95%	0.75%	1.20%	1.95%	1.45%

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 LIVESTRONG 2040 PORTFOLIO (USD $)	1 year	3 years	5 years	10 years
INVESTOR CLASS	97	303	526	1,166
INSTITUTIONAL CLASS	77	240	417	931
A CLASS	690	935	1,197	1,946
C Class	198	613	1,053	2,272
R CLASS	148	459	793	1,734

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 20% of the average value of its portfolio.

Principal Investment Strategies

LIVESTRONG 2040 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	76.35%	Fixed-Income Securities (Bond Funds)	22.15%
NT Core Equity Plus Fund	3.75%	High-Yield Fund	2.20%
NT Emerging Markets Fund	4.50%	Inflation-Adjusted Bond Fund	4.40%
NT Equity Growth Fund	10.25%	NT Diversified Bond Fund	15.55%
NT Growth Fund	14.00%
NT International Growth Fund	10.00%	Cash Equivalents (Money Market Funds)	1.50%
NT Large Company Value Fund	14.00%	Premium Money Market Fund	1.50%
NT Mid Cap Value Fund	6.75%
NT Small Company Fund	4.00%
NT Vista Fund	6.75%
Real Estate Fund	2.35%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Principal Risks

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, 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): 14.38%

Lowest Performance Quarter (3Q 2011): -12.68%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 12.93%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns LIVESTRONG 2040 PORTFOLIO		1 Year	Since Inception	Inception Date
INVESTOR CLASS		(0.27%)	0.21%	May 30, 2008
INVESTOR CLASS After Taxes on Distributions		(0.76%)	(0.17%)
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		0.03%	0.02%
INSTITUTIONAL CLASS		(0.07%)	0.41%	May 30, 2008
A CLASS	[1]	(6.21%)	(1.67%)	May 30, 2008
C Class	[2]	(1.26%)	(0.81%)	Mar. 01, 2010
R CLASS		(0.77%)	(0.28%)	May 30, 2008
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)		1.03%	(0.55%)	May 30, 2008
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)		7.84%	6.79%	May 30, 2008

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.

LIVESTRONG 2045 PORTFOLIO

LIVESTRONG 2045 PORTFOLIO

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

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 58 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 LIVESTRONG 2045 PORTFOLIO (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 LIVESTRONG 2045 PORTFOLIO	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C Class	R CLASS
Management Fee	none	none	none	none	none
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Administrative Fee	0.20%	none	0.20%	0.20%	0.20%
Other	none	none	none	none	none
Other Expenses	0.20%	none	0.20%	0.20%	0.20%
Acquired Fund Fees and Expenses	0.78%	0.78%	0.78%	0.78%	0.78%
Total Annual Fund Operating Expenses	0.98%	0.78%	1.23%	1.98%	1.48%

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 LIVESTRONG 2045 PORTFOLIO (USD $)	1 year	3 years	5 years	10 years
INVESTOR CLASS	100	313	542	1,201
INSTITUTIONAL CLASS	80	250	434	966
A CLASS	693	943	1,212	1,978
C Class	201	622	1,068	2,303
R CLASS	151	469	809	1,767

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 14% of the average value of its portfolio.

Principal Investment Strategies

LIVESTRONG 2045 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	80.85%	Fixed-Income Securities (Bond Funds)	19.15%
NT Core Equity Plus Fund	4.50%	High-Yield Fund	1.90%
NT Emerging Markets Fund	5.25%	Inflation-Adjusted Bond Fund	3.80%
NT Equity Growth Fund	10.25%	NT Diversified Bond Fund	13.45%
NT Growth Fund	14.75%
NT International Growth Fund	10.00%	Cash Equivalents (Money Market Funds)	0.00%
NT Large Company Value Fund	14.75%
NT Mid Cap Value Fund	7.25%
NT Small Company Fund	4.25%
NT Vista Fund	7.25%
Real Estate Fund	2.60%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Principal Risks

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, 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): 14.89%

Lowest Performance Quarter (4Q 2008): -19.49%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 13.28%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns LIVESTRONG 2045 PORTFOLIO		1 Year	5 Years	Since Inception	Inception Date
INVESTOR CLASS		(0.78%)	1.25%	5.44%	Aug. 31, 2004
INVESTOR CLASS After Taxes on Distributions		(1.20%)	0.64%	4.68%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		(0.33%)	0.79%	4.38%
INSTITUTIONAL CLASS		(0.58%)	1.43%	5.64%	Aug. 31, 2004
A CLASS	[1]	(6.65%)	(0.19%)	4.33%	Aug. 31, 2004
C Class	[2]	(1.68%)	0.24%	4.38%	Mar. 01, 2010
R CLASS		(1.27%)	0.75%	4.91%	Aug. 31, 2004
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)		1.03%	(0.01%)	4.41%	Aug. 31, 2004
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)		7.84%	6.50%	5.51%	Aug. 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.

LIVESTRONG 2050 PORTFOLIO

LIVESTRONG 2050 PORTFOLIO

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

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 58 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 LIVESTRONG 2050 PORTFOLIO (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 LIVESTRONG 2050 PORTFOLIO	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C Class	R CLASS
Management Fee	none	none	none	none	none
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Administrative Fee	0.20%	none	0.20%	0.20%	0.20%
Other	0.01%	0.01%	0.01%	0.01%	0.01%
Other Expenses	0.21%	0.01%	0.21%	0.21%	0.21%
Acquired Fund Fees and Expenses	0.79%	0.79%	0.79%	0.79%	0.79%
Total Annual Fund Operating Expenses	1.00%	0.80%	1.25%	2.00%	1.50%

Example

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

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

Expense Example LIVESTRONG 2050 PORTFOLIO (USD $)	1 year	3 years	5 years	10 years
INVESTOR CLASS	102	319	553	1,225
INSTITUTIONAL CLASS	82	256	445	990
A CLASS	695	949	1,223	1,999
C Class	203	628	1,079	2,324
R CLASS	153	475	819	1,789

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 12% of the average value of its portfolio.

Principal Investment Strategies

LIVESTRONG 2050 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	83.35%	Fixed-Income Securities (Bond Funds)	16.65%
NT Core Equity Plus Fund	4.50%	High-Yield Fund	1.65%
NT Emerging Markets Fund	6.25%	Inflation-Adjusted Bond Fund	3.30%
NT Equity Growth Fund	10.50%	NT Diversified Bond Fund	11.70%
NT Growth Fund	15.00%
NT International Growth Fund	9.75%	Cash Equivalents (Money Market Funds)	0.00%
NT Large Company Value Fund	15.25%
NT Mid Cap Value Fund	7.25%
NT Small Company Fund	4.75%
NT Vista Fund	7.25%
Real Estate Fund	2.85%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Principal Risks

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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, including yields, 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): 15.07%

Lowest Performance Quarter (3Q 2011): -14.04%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 13.61%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns LIVESTRONG 2050 PORTFOLIO		1 Year	Since Inception	Inception Date
INVESTOR CLASS		(0.96%)	(0.77%)	May 30, 2008
INVESTOR CLASS After Taxes on Distributions		(1.36%)	(1.08%)
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares		(0.43%)	(0.78%)
INSTITUTIONAL CLASS		(0.77%)	(0.54%)	May 30, 2008
A CLASS	[1]	(6.89%)	(2.63%)	May 30, 2008
C Class	[2]	(1.94%)	(1.75%)	Mar. 01, 2010
R CLASS		(1.45%)	(1.23%)	May 30, 2008
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)		1.03%	(0.55%)	May 30, 2008
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)		7.84%	6.79%	May 30, 2008

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.

LIVESTRONG 2055 PORTFOLIO

LIVESTRONG 2055 PORTFOLIO

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

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 58 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 LIVESTRONG 2055 PORTFOLIO (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 LIVESTRONG 2055 PORTFOLIO	INVESTOR CLASS	INSTITUTIONAL CLASS	A CLASS	C CLASS	R CLASS
Management Fee	none	none	none	none	none
Distribution and Service (12b-1) Fees	none	none	0.25%	1.00%	0.50%
Administrative Fee	0.20%	none	0.20%	0.20%	0.20%
Other	none	none	none	none	none
Other Expenses	0.20%	none	0.20%	0.20%	0.20%
Acquired Fund Fees and Expenses	0.81%	0.81%	0.81%	0.81%	0.81%
Total Annual Fund Operating Expenses	1.01%	0.81%	1.26%	2.01%	1.51%

Example

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

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

Expense Example LIVESTRONG 2055 PORTFOLIO (USD $)	1 year	3 years	5 years	10 years
INVESTOR CLASS	103	322	559	1,236
INSTITUTIONAL CLASS	83	259	450	1,002
A CLASS	696	952	1,228	2,010
C CLASS	204	632	1,084	2,334
R CLASS	154	478	824	1,800

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 44% of the average value of its portfolio.

Principal Investment Strategies

LIVESTRONG 2055 Portfolio is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The following table shows the fund’s target allocation for the various asset classes and underlying funds as of the date of the prospectus:

Equity Securities (Stock Funds)	85.00%	Fixed-Income Securities (Bond Funds)	15.00%
NT Core Equity Plus Fund	4.50%	High-Yield Fund	1.50%
NT Emerging Markets Fund	6.50%	Inflation-Adjusted Bond Fund	3.00%
NT Equity Growth Fund	10.75%	NT Diversified Bond Fund	10.50%
NT Growth Fund	15.25%
NT International Growth Fund	9.50%	Cash Equivalents (Money Market Funds)	0.00%
NT Large Company Value Fund	15.50%
NT Mid Cap Value Fund	7.50%
NT Small Company Fund	5.00%
NT Vista Fund	7.50%
Real Estate Fund	3.00%

The target date in the fund name refers to the approximate year an investor plans to retire and likely would stop making new investments in the fund. The fund assumes a retirement age of 65 and may not be appropriate for an investor who plans to retire at or near the target date, but at an age well before or after 65. As the target year approaches, the fund’s asset mix will become more conservative by decreasing the allocation to stocks and increasing the allocation to bonds and cash. By the time the fund reaches its target year, the asset mix will become fixed and match that of LIVESTRONG Income Portfolio, which is currently 45% stock funds, 45% bond funds and 10% money market funds. The fund is designed for investors who plan to withdraw the value of their account gradually after retirement. The following chart shows how the asset mix is expected to change over time according to a predetermined glide path.

Years to Retirement	45	44	43	42	41	40	39	38	37	36	35	34	33
Stocks	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	84.70%	83.90%	83.35%	82.80%	82.25%	81.70%	81.40%
Bonds	15.00%	15.00%	15.00%	15.00%	15.00%	15.00%	15.30%	16.10%	16.65%	17.20%	17.75%	18.30%	18.60%
Cash	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15
80.85%	80.40%	80.00%	78.45%	77.15%	76.35%	74.95%	73.40%	72.10%	70.80%	70.25%	68.55%	67.00%	65.85%	64.50%	63.35%	62.30%	61.00%
19.15%	19.60%	20.00%	21.05%	21.85%	22.15%	23.05%	24.10%	24.90%	25.70%	25.75%	26.95%	28.00%	29.15%	30.50%	31.65%	32.70%	34.00%
0.00%	0.00%	0.00%	0.50%	1.00%	1.50%	2.00%	2.50%	3.00%	3.50%	4.00%	4.50%	5.00%	5.00%	5.00%	5.00%	5.00%	5.00%

14	13	12	11	10	9	8	7	6	5	4	3	2	1	RETIREMENT
59.70%	58.60%	57.35%	56.30%	55.00%	54.20%	52.90%	52.10%	51.05%	50.00%	48.95%	47.90%	46.85%	46.05%	45.00%
35.30%	36.40%	37.65%	38.70%	40.00%	40.30%	41.10%	41.40%	41.95%	42.50%	43.05%	43.60%	44.15%	44.45%	45.00%
5.00%	5.00%	5.00%	5.00%	5.00%	5.50%	6.00%	6.50%	7.00%	7.50%	8.00%	8.50%	9.00%	9.50%	10.00%

Years After Retirement	1	2	3	4	5	6	7	8	9	10	11	12	13
Stocks	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Bonds	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
Cash	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%	45.00%
10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%

The portfolio managers regularly review the fund’s allocations to determine whether rebalancing is appropriate. Although we do not intend to make frequent tactical adjustments to the target asset mix or trade actively among the underlying funds (other than the glide path adjustments described above), we reserve the right to modify the target allocations and underlying funds from time to time should circumstances warrant a change.

Principal Risks

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by any erosion in the ability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Securities Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• Tobacco Exclusion – The underlying funds do not invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry. This exclusion may cause an underlying fund 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 underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own 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, including losses near to, at, or after retirement. There is no guarantee that the fund will provide adequate income at or through your retirement.

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 fund’s performance history is not available as of the date of this prospectus. When the fund has investment results for a full calendar year, this section will feature charts that show annual total returns, highest and lowest quarterly returns and average annual total returns for the fund. This information indicates the volatility of the fund’s historical returns from year to year.

Performance information is designed to help you see how fund returns can vary. Keep in mind that past performance (before and after taxes) does not predict how the fund will perform in the future.

For current performance information, please visit americancentury.com.

ONE CHOICE PORTFOLIO: VERY CONSERVATIVE

ONE CHOICE PORTFOLIO: VERY CONSERVATIVE

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

Fees and Expenses

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

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees (USD $)	ONE CHOICE PORTFOLIO: VERY CONSERVATIVE INVESTOR CLASS
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25

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

Annual Fund Operating Expenses	ONE CHOICE PORTFOLIO: VERY CONSERVATIVE INVESTOR CLASS
Management Fee	none
Distribution and Service (12b-1) Fees	none
Other Expenses	none
Acquired Fund Fees and Expenses	0.62%
Total Annual Fund Operating Expenses	0.62%

Example

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

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

Expense Example (USD $)	1 year	3 years	5 years	10 years
ONE CHOICE PORTFOLIO: VERY CONSERVATIVE INVESTOR CLASS	63	199	346	775

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance.  During the most recent fiscal year, the fund’s portfolio turnover rate was 13% of the average value of its portfolio.

Principal Investment Strategies

One Choice Portfolio: Very Conservative is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century Investments mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The fund’s asset allocation is intended to diversify investments among stocks, bonds and cash equivalents.

The following table indicates the fund’s neutral mix; that is, how the fund’s investments generally will be allocated among the major asset classes over the long term.

Equity Securities (Stock Funds)	25.00%	Fixed-Income Securities (Bond Funds)	52.00%
Core Equity Plus Fund	1.00%	Diversified Bond Fund	32.00%
Equity Growth Fund	4.00%	Inflation-Adjusted Bond Fund	10.00%
Growth Fund	2.50%	International Bond Fund	10.00%
Large Company Value Fund	8.00%
Mid Cap Value Fund	5.00%	Cash Equivalents (Money Market Funds)	23.00%
Real Estate Fund	2.00%	Prime Money Market Fund	23.00%
Small Company Fund	1.00%
Vista Fund	1.50%

The managers regularly review the fund and may make changes to the fund’s asset class allocations that deviate from the neutral mix to emphasize investments that they believe will provide the most favorable outlook for achieving the fund’s objective. The fund also may deviate from the neutral mix due to differences in asset class performance or prevailing market conditions. The following table shows the operating ranges within which the fund’s asset class allocations generally will vary over short-term periods.

	Equity Securities (Stock Funds)	Fixed-Income Securities (Bond Funds)	Cash Equivalents (Money Market Funds)
Operating Ranges	20-30%	45-55%	15-35%

However, in light of the current extreme low interest rate environment for cash equivalent (money market) securities, the managers intend to reallocate a portion of the fund’s assets from money market funds to short-term bond funds effective January 4, 2013.  This shift will cause the fund to temporarily deviate from the neutral mix and operating ranges listed above.  During this period, the fund’s investments generally will be allocated as indicated in the following table, subject to any further adjustments deemed appropriate by the managers in light of changing market conditions.

Equity Securities (Stock Funds)	25.00%	Fixed-Income Securities (Bond Funds)	67.00%
Core Equity Plus Fund	1.00%	Diversified Bond Fund	32.00%
Equity Growth Fund	4.00%	Inflation-Adjusted Bond Fund	10.00%
Growth Fund	2.50%	International Bond Fund	10.00%
Large Company Value Fund	8.00%	Short Duration Fund	7.00%
Mid Cap Value Fund	5.00%	Short Duration Inflation Protection Bond Fund	8.00%
Real Estate Fund	2.00%
Small Company Fund	1.00%	Cash Equivalents (Money Market Funds)	8.00%
Vista Fund	1.50%	Prime Money Market Fund	8.00%

Over the long term, the managers expect to reallocate the fund’s assets back toward the neutral mix.

Principal Risks

• Allocation Risk – The fund’s ability to achieve its investment objective depends in part on the managers’ skill in determining the funds’ asset class allocations and in selecting and weighting the underlying funds. The managers’ evaluations and assumptions regarding asset classes and underlying funds may differ from actual market conditions.

• Market Risk – The value of the fund’s shares will go up and down based on the performance of the underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own and other factors generally affecting the securities market.

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by the inability or perceived inability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price.

• 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, including yields, 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) 6.20%

Lowest Performance Quarter (4Q 2008) -3.97%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 6.44%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns ONE CHOICE PORTFOLIO: VERY CONSERVATIVE	1 Year	5 Years	Since Inception	Inception Date
INVESTOR CLASS	4.88%	4.12%	4.74%	Sep. 30, 2004
INVESTOR CLASS After Taxes on Distributions	4.10%	3.09%	3.60%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares	3.24%	2.95%	3.43%
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)	1.03%	(0.01%)	4.24%	Sep. 30, 2004
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)	7.84%	6.50%	5.54%	Sep. 30, 2004

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.

ONE CHOICE PORTFOLIO: CONSERVATIVE

ONE CHOICE PORTFOLIO: CONSERVATIVE

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

Fees and Expenses

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

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees (USD $)	ONE CHOICE PORTFOLIO: CONSERVATIVE INVESTOR CLASS
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25

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

Annual Fund Operating Expenses	ONE CHOICE PORTFOLIO: CONSERVATIVE INVESTOR CLASS
Management Fee	none
Distribution and Service (12b-1) Fees	none
Other Expenses	none
Acquired Fund Fees and Expenses	0.76%
Total Annual Fund Operating Expenses	0.76%

Example

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

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

Expense Example (USD $)	1 year	3 years	5 years	10 years
ONE CHOICE PORTFOLIO: CONSERVATIVE INVESTOR CLASS	78	243	423	943

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 12% of the average value of its portfolio.

Principal Investment Strategies

One Choice Portfolio: Conservative is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century Investments mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The fund’s asset allocation is intended to diversify investments among stocks, bonds and cash equivalents.

The following table indicates the fund’s neutral mix; that is, how the fund’s investments generally will be allocated among the major asset classes over the long term. The table also shows the neutral weightings of each underlying fund currently being used within the various asset classes. This information is as of the date of this prospectus.

Equity Securities (Stock Funds)	45.00%	Fixed-Income Securities (Bond Funds)	47.00%
Core Equity Plus Fund	2.00%	Diversified Bond Fund	30.00%
Equity Growth Fund	7.00%	Inflation-Adjusted Bond Fund	9.00%
Growth Fund	4.75%	International Bond Fund	8.00%
International Growth Fund	6.00%
Large Company Value Fund	11.00%	Cash Equivalents (Money Market Funds)	8.00%
Mid Cap Value Fund	6.75%	Prime Money Market Fund	8.00%
Real Estate Fund	2.00%
Small Company Fund	1.50%
Vista Fund	4.00%

The managers regularly review the fund and may make changes to the fund’s asset class allocations that deviate from the neutral mix to emphasize investments that they believe will provide the most favorable outlook for achieving the fund’s objective. The fund also may deviate from the neutral mix due to differences in asset class performance or prevailing market conditions. The following table shows the operating ranges within which the fund’s asset class allocations generally will vary over short-term periods.

	Equity Securities (Stock Funds)	Fixed-Income Securities (Bond Funds)	Cash Equivalents (Money Market Funds)
Operating Ranges	39-51%	38-52%	5-20%

Principal Risks

• Allocation Risk – The fund’s ability to achieve its investment objective depends in part on the managers’ skill in determining the funds’ asset class allocations and in selecting and weighting the underlying funds. The managers’ evaluations and assumptions regarding asset classes and underlying funds may differ from actual market conditions.

• Market Risk – The value of the fund’s shares will go up and down based on the performance of the underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own and other factors generally affecting the securities market.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by the inability or perceived inability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price.

• 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, including yields, 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) 9.27%

Lowest Performance Quarter (4Q 2008) -8.82%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 9.11%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns ONE CHOICE PORTFOLIO: CONSERVATIVE	1 Year	5 Years	Since Inception	Inception Date
INVESTOR CLASS	3.76%	3.48%	5.10%	Sep. 30, 2004
INVESTOR CLASS After Taxes on Distributions	3.03%	2.50%	4.05%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares	2.55%	2.47%	3.84%
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)	1.03%	(0.01%)	4.24%	Sep. 30, 2004
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)	7.84%	6.50%	5.54%	Sep. 30, 2004

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.

ONE CHOICE PORTFOLIO: MODERATE

ONE CHOICE PORTFOLIO: MODERATE

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

Fees and Expenses

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

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees (USD $)	ONE CHOICE PORTFOLIO: MODERATE INVESTOR CLASS
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25

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

Annual Fund Operating Expenses	ONE CHOICE PORTFOLIO: MODERATE INVESTOR CLASS
Management Fee	none
Distribution and Service (12b-1) Fees	none
Other Expenses	0.01%
Acquired Fund Fees and Expenses	0.89%
Total Annual Fund Operating Expenses	0.90%

Example

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

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

Expense Example (USD $)	1 year	3 years	5 years	10 years
ONE CHOICE PORTFOLIO: MODERATE INVESTOR CLASS	92	287	499	1,108

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 16% of the average value of its portfolio.

Principal Investment Strategies

One Choice Portfolio: Moderate is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century Investments mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The fund’s asset allocation is intended to diversify investments among stocks, bonds and cash equivalents.

The following table indicates the fund’s neutral mix; that is, how the fund’s investments generally will be allocated among the major asset classes over the long term. The table also shows the neutral weightings of each underlying fund currently being used within the various asset classes. This information is as of the date of this prospectus.

Equity Securities (Stock Funds)	64.00%	Fixed-Income Securities (Bond Funds)	31.00%
Core Equity Plus Fund	4.00%	Diversified Bond Fund	19.00%
Emerging Markets Fund	4.00%	High-Yield Fund	3.00%
Equity Growth Fund	12.00%	Inflation-Adjusted Bond Fund	6.00%
Growth Fund	8.00%	International Bond Fund	3.00%
International Growth Fund	10.00%
Large Company Value Fund	9.50%	Cash Equivalents (Money Market Funds)	5.00%
Mid Cap Value Fund	5.50%	Prime Money Market Fund	5.00%
Real Estate Fund	2.00%
Small Company Fund	2.00%
Vista Fund	7.00%

The managers regularly review the fund and may make changes to the fund’s asset class allocations that deviate from the neutral mix to emphasize investments that they believe will provide the most favorable outlook for achieving the fund’s objective. The fund also may deviate from the neutral mix due to differences in asset class performance or prevailing market conditions. The following table shows the operating ranges within which the fund’s asset class allocations generally will vary over short-term periods.

	Equity Securities (Stock Funds)	Fixed-Income Securities (Bond Funds)	Cash Equivalents (Money Market Funds)
Operating Ranges	53-73%	21-41%	0-15%

Principal Risks

• Allocation Risk – The fund’s ability to achieve its investment objective depends in part on the managers’ skill in determining the funds’ asset class allocations and in selecting and weighting the underlying funds. The managers’ evaluations and assumptions regarding asset classes and underlying funds may differ from actual market conditions.

• Market Risk – The value of the fund’s shares will go up and down based on the performance of the underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own and other factors generally affecting the securities market.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by the inability or perceived inability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• 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, including yields, 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) 11.86%

Lowest Performance Quarter (4Q 2008) -14.20%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 11.65%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns ONE CHOICE PORTFOLIO: MODERATE	1 Year	5 Years	Since Inception	Inception Date
INVESTOR CLASS	0.88%	2.41%	5.39%	Sep. 30, 2004
INVESTOR CLASS After Taxes on Distributions	0.31%	1.55%	4.47%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares	0.70%	1.66%	4.21%
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)	1.03%	(0.01%)	4.24%	Sep. 30, 2004
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)	7.84%	6.50%	5.54%	Sep. 30, 2004

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.

ONE CHOICE PORTFOLIO: AGGRESSIVE

ONE CHOICE PORTFOLIO: AGGRESSIVE

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

Fees and Expenses

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

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees (USD $)	ONE CHOICE PORTFOLIO: AGGRESSIVE INVESTOR CLASS
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25

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

Annual Fund Operating Expenses	ONE CHOICE PORTFOLIO: AGGRESSIVE INVESTOR CLASS
Management Fee	none
Distribution and Service (12b-1) Fees	none
Other Expenses	0.01%
Acquired Fund Fees and Expenses	1.00%
Total Annual Fund Operating Expenses	1.01%

Example

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

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

Expense Example (USD $)	1 year	3 years	5 years	10 years
ONE CHOICE PORTFOLIO: AGGRESSIVE INVESTOR CLASS	103	322	559	1,236

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). 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 14% of the average value of its portfolio.

Principal Investment Strategies

One Choice Portfolio: Aggressive is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century Investments mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The fund’s asset allocation is intended to diversify investments among stocks, bonds and cash equivalents.

The following table indicates the fund’s neutral mix; that is, how the fund’s investments generally will be allocated among the major asset classes over the long term. The table also shows the neutral weightings of each underlying fund currently being used within the various asset classes. This information is as of the date of this prospectus.

Equity Securities (Stock Funds)	79.00%	Fixed-Income Securities (Bond Funds)	20.00%
Core Equity Plus Fund	4.50%	Diversified Bond Fund	11.00%
Emerging Markets Fund	6.50%	High-Yield Fund	5.00%
Equity Growth Fund	10.00%	Inflation-Adjusted Bond Fund	4.00%
Growth Fund	14.50%
International Growth Fund	12.50%	Cash Equivalents (Money Market Funds)	1.00%
Large Company Value Fund	8.50%	Prime Money Market Fund	1.00%
Mid Cap Value Fund	4.75%
Real Estate Fund	2.00%
Small Company Fund	2.25%
Vista Fund	13.50%

The managers regularly review the fund and may make changes to the fund’s asset class allocations that deviate from the neutral mix to emphasize investments that they believe will provide the most favorable outlook for achieving the fund’s objective. The fund also may deviate from the neutral mix due to differences in asset class performance or prevailing market conditions. The following table shows the operating ranges within which the fund’s asset class allocations generally will vary over short-term periods.

	Equity Securities (Stock Funds)	Fixed-Income Securities (Bond Funds)	Cash Equivalents (Money Market Funds)
Operating Ranges	60-90%	10-30%	0-15%

Principal Risks

• Allocation Risk – The fund’s ability to achieve its investment objective depends in part on the managers’ skill in determining the funds’ asset class allocations and in selecting and weighting the underlying funds. The managers’ evaluations and assumptions regarding asset classes and underlying funds may differ from actual market conditions.

• Market Risk – The value of the fund’s shares will go up and down based on the performance of the underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own and other factors generally affecting the securities market.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Interest Rate Risk – Generally, when interest rates rise, the value of an underlying fund’s fixed-income securities will decline. The opposite is true when interest rates decline. Underlying funds with longer weighted average maturities are more sensitive to interest rate changes.

• Credit Risk – The value of an underlying fund’s fixed-income securities will be affected adversely by the inability or perceived inability of the issuers of these securities to make interest and principal payments as they become due. Changes in the credit rating of a fixed-income security held by an underlying fund could have a similar effect.

• Foreign Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• 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, including yields, 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) 13.90%

Lowest Performance Quarter (4Q 2008) -18.80%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 13.46%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns ONE CHOICE PORTFOLIO: AGGRESSIVE	1 Year	5 Years	Since Inception	Inception Date
INVESTOR CLASS	(1.68%)	1.59%	5.41%	Sep. 30, 2004
INVESTOR CLASS After Taxes on Distributions	(2.13%)	0.82%	4.60%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares	(0.97%)	1.03%	4.32%
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)	1.03%	(0.01%)	4.24%	Sep. 30, 2004
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)	7.84%	6.50%	5.54%	Sep. 30, 2004

After-tax returns are calculated using the historcal 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.

ONE CHOICE PORTFOLIO: VERY AGGRESSIVE

ONE CHOICE PORTFOLIO: VERY AGGRESSIVE

Investment Objective

The fund seeks the highest total return consistent with its asset mix.

Fees and Expenses

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

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees (USD $)	ONE CHOICE PORTFOLIO: VERY AGGRESSIVE INVESTOR CLASS
Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000)	25

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

Annual Fund Operating Expenses	ONE CHOICE PORTFOLIO: VERY AGGRESSIVE INVESTOR CLASS
Management Fee	none
Distribution and Service (12b-1) Fees	none
Other Expenses	none
Acquired Fund Fees and Expenses	1.07%
Total Annual Fund Operating Expenses	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 (USD $)	1 year	3 years	5 years	10 years
ONE CHOICE PORTFOLIO: VERY AGGRESSIVE INVESTOR CLASS	109	341	591	1,306

Portfolio Turnover

Because the fund buys and sells shares of other American Century mutual funds (the underlying funds) directly from the issuers, the fund is not expected to incur transaction costs directly.  However, as a shareholder in the underlying funds, the fund indirectly pays transaction costs, such as commissions, when the underlying funds buy and sell securities (or “turn over” their portfolios). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance.  During the most recent fiscal year, the fund’s portfolio turnover rate was 13% of the average value of its portfolio.

Principal Investment Strategies

One Choice Portfolio: Very Aggressive is a “fund of funds,” meaning that it seeks to achieve its objective by investing in other American Century Investments mutual funds (the underlying funds) that represent a variety of asset classes and investment styles. The fund’s asset allocation is intended to diversify investments among stocks, bonds and cash equivalents.

The following table indicates the fund’s neutral mix; that is, how the fund’s investments generally will be allocated among the major asset classes over the long term. The table also shows the neutral weightings of each underlying fund currently being used within the various asset classes. This information is as of the date of this prospectus.

Equity Securities (Stock Funds)	96.00%	Fixed-Income Securities (Bond Funds)	3.00%
Core Equity Plus Fund	4.75%	Diversified Bond Fund	3.00%
Emerging Markets Fund	7.50%
Equity Growth Fund	13.00%
Growth Fund	17.75%	Cash Equivalents (Money Market Funds)	1.00%
International Growth Fund	15.50%	Prime Money Market Fund	1.00%
Large Company Value Fund	10.50%
Mid Cap Value Fund	6.00%
Real Estate Fund	2.00%
Small Company Fund	2.50%
Vista Fund	16.50%

The managers regularly review the fund and may make changes to the fund’s asset class allocations that deviate from the neutral mix to emphasize investments that they believe will provide the most favorable outlook for achieving the fund’s objective. The fund also may deviate from the neutral mix due to differences in asset class performance or prevailing market conditions. The following table shows the operating ranges within which the fund’s asset class allocations generally will vary over short-term periods.

	Equity Securities (Stock Funds)	Fixed-Income Securities (Bond Funds)	Cash Equivalents (Money Market Funds)
Operating Ranges	75-100%	0-10%	0-15%

Principal Risks

• Allocation Risk – The fund’s ability to achieve its investment objective depends in part on the managers’ skill in determining the funds’ asset class allocations and in selecting and weighting the underlying funds. The managers’ evaluations and assumptions regarding asset classes and underlying funds may differ from actual market conditions.

• Market Risk – The value of the fund’s shares will go up and down based on the performance of the underlying funds in which it invests. The value of the underlying funds’ shares will, in turn, fluctuate based on the performance of the securities they own and other factors generally affecting the securities market.

• Small- and Mid-Cap Stock Risks – Stocks of smaller companies may be more volatile than larger-company stocks. 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. To the extent an underlying fund invests in these companies, it may take on more risk.

• “Growth” and “Value” Style Risks – The underlying funds represent a mix of investment styles, each of which has risks associated with it. Growth stocks can be volatile and may lack dividends that can cushion share prices during market declines. Value stocks may continue to be undervalued by the market for long periods of time.

• Foreign Risk – Some of the underlying funds invest in foreign securities, which are generally riskier than U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Fluctuations in currency exchange rates also may affect an underlying fund’s share price. Investing in securities of companies located in emerging market countries is generally riskier than investing in securities of companies located in developed foreign countries.

• 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, including yields, please visit americancentury.com.

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

Calendar Year Total Returns

Highest Performance Quarter (3Q 2009) 15.67%

Lowest Performance Quarter (4Q 2008) -22.24%

As of September 30, 2012, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 14.71%.

Average Annual Total Returns For the calendar year ended December 31, 2011

Average Annual Total Returns ONE CHOICE PORTFOLIO: VERY AGGRESSIVE	1 Year	5 Years	Since Inception	Inception Date
INVESTOR CLASS	(3.78%)	0.04%	4.91%	Sep. 30, 2004
INVESTOR CLASS After Taxes on Distributions	(3.97%)	(0.49%)	4.31%
INVESTOR CLASS After Taxes on Distributions and Sale of Fund Shares	(2.30%)	(0.12%)	4.04%
Russell 3000® Index (reflects no deduction for fees, expenses or taxes)	1.03%	(0.01%)	4.24%	Sep. 30, 2004
Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)	7.84%	6.50%	5.54%	Sep. 30, 2004

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 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 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 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 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 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 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 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 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 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.