485BPOS

As Filed with the U.S. Securities and Exchange Commission on December 14, 2017

1933 Act File No. 333-132114

1940 Act File No. 811-21861

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549
__________________
FORM N-1A
__________________
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	☒
Pre-Effective Amendment No.	☐
Post-Effective Amendment No. 23	☒
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	☒
Amendment No. 24	☒
(Check appropriate box or boxes.)
__________________
AMERICAN CENTURY GROWTH FUNDS, INC. (Exact Name of Registrant as Specified in Charter)
__________________
4500 MAIN STREET, KANSAS CITY, MISSOURI 64111 (Address of Principal Executive Offices)                   (Zip Code)
REGISTRANT’S TELEPHONE NUMBER, INCLUDING AREA CODE: (816) 531-5575
CHARLES A. ETHERINGTON 4500 MAIN STREET, KANSAS CITY, MISSOURI 64111 (Name and Address of Agent for Service)
It is proposed that this filing will become effective (check appropriate box)

☒	immediately upon filing pursuant to paragraph (b)
☐	on (date) at 8:30 AM (Central) 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 14th day of December, 2017.

American Century Growth Funds, Inc. 

(Registrant)

By:

*

___________________________________

Jonathan S. Thomas

President

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

SIGNATURES	TITLE	DATE
* _________________________________ Jonathan S. Thomas	President and Director	December 14, 2017
* _________________________________ C. Jean Wade	Vice President, Treasurer and Chief Financial Officer	December 14, 2017
* _________________________________ Thomas W. Bunn	Director	December 14, 2017
* _________________________________ Barry Fink	Director	December 14, 2017
* _________________________________ Andrea C. Hall, Ph.D.	Director	December 14, 2017
* _________________________________ Jan M. Lewis	Director	December 14, 2017
* _________________________________ James A. Olson	Chairman of the Board and Director	December 14, 2017

* _________________________________ M. Jeannine Strandjord	Director	December 14, 2017
* _________________________________ John R. Whitten	Director	December 14, 2017
* _________________________________ Stephen E. Yates	Director	December 14, 2017

*By:/s/ Evan C. Johnson

Evan C. Johnson

Attorney in Fact (Pursuant to Power of Attorney effective December 1, 2017, and filed herewith)

Power of Attorney

I, the undersigned Director/Officer of the following investment companies (“the Funds”):

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.

hereby constitute and appoint, Ashley L. Bergus, Ryan L. Blaine, Brian L. Brogan, Evan C. Johnson, Kathleen Gunja Nelson, and Giles M. Walsh 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 1, 2017.

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 1^st day of December, 2017.

/s/ Thomas W. Bunn	/s/ Barry Fink
Thomas W. Bunn, 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/ M. Jeannine Strandjord
James A. Olson, Chairman and Director	M. Jeannine Strandjord, Director
/s/ John R. Whitten	/s/ Stephen E. Yates
John R. Whitten, Director	Stephen E. Yates, Director
/s/ Jonathan S. Thomas	/s/ C. Jean Wade
Jonathan S. Thomas, President and Director	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.

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 1, 2017, 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 Ashley L. Bergus, Ryan L. Blaine, Brian L. Brogan, Evan C. Johnson, Kathleen Gunja Nelson, and Giles M. Walsh 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 1^st day of December, 2017.

/s/ Ward D. Stauffer            

Ward D. Stauffer

Secretary

EXHIBIT INDEX

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

XML

American Century Growth Funds | ADAPTIVE ALL CAP FUND

Adaptive All Cap Fund

Investment Objective

The fund seeks long-term capital growth.

Fees and Expenses

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

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees - USD ($)	INVESTOR CLASS	I CLASS		ADVISOR CLASS	R CLASS	R5 CLASS	R6 CLASS
Maximum Account Fee | American Century Growth Funds | ADAPTIVE ALL CAP FUND	$ 25	none	[1]	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 - American Century Growth Funds - ADAPTIVE ALL CAP FUND	INVESTOR CLASS	I CLASS	ADVISOR CLASS	R CLASS	R5 CLASS	R6 CLASS
Management Fees (as a percentage of Assets)	1.15%	0.95%	1.15%	1.15%	0.95%	0.80%
Distribution and Service (12b-1) Fees	none	none	0.25%	0.50%	none	none
Other Expenses (as a percentage of Assets):	none	none	none	none	none	none
Expenses (as a percentage of Assets)	1.15%	0.95%	1.40%	1.65%	0.95%	0.80%

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. You may be required to pay brokerage commissions on your purchases of Investor or I Class shares of the fund, which are not reflected in the example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example - American Century Growth Funds - ADAPTIVE ALL CAP FUND - USD ($)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
INVESTOR CLASS	117	366	634	1,397
I CLASS	97	303	526	1,166
ADVISOR CLASS	143	444	767	1,679
R CLASS	168	521	898	1,953
R5 CLASS	97	303	526	1,166
R6 CLASS	82	256	445	990

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 105% of the average value of its portfolio.

Principal Investment Strategies

The fund uses an approach to common stock investing developed by the fund’s investment advisor. This approach relies heavily on quantitative tools to identify attractive investment opportunities, regardless of company size, industry type or geographic location, on a disciplined, consistent basis.

The portfolio managers use these quantitative tools to rank stocks from most attractive to least attractive in a model that uses factors that the advisor believes are predictive of a stock’s performance. These factors can be classified into two categories, one related to general market conditions and the other related to stock specific criteria. Factors related to general market conditions help determine the importance of the stock specific criteria, which may include those related to valuation, quality, growth and sentiment. The managers also use portfolio optimization to provide a balance between risk and expected return.

The fund may engage in active and frequent trading of portfolio securities to achieve its principal investment strategies. This may cause higher transaction costs and may affect the fund’s performance. It may also result in the realization and distribution of capital gains.

In addition to investing in U.S. companies, the fund may invest in securities of foreign companies, including companies located in emerging markets when these securities meet the portfolio managers’ standards of selection.

Principal Risks

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

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

• Growth Stocks - Investments in growth stocks may be more volatile than other stocks and the overall stock market. These stocks are typically priced higher than other stocks because of their growth potential, which may or may not be realized.

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

• High Turnover - The fund’s portfolio turnover may be high when compared to a “buy and hold” fund strategy. This could result in relatively high commission costs, which could hurt the fund’s performance, and create tax liabilities for the fund’s shareholders.

• Foreign Securities - The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries. Foreign investments may be significant at times.

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

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

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

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

Fund Performance

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

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

Calendar Year Total Returns

Highest Performance Quarter (3Q 2009): 16.39%Lowest Performance Quarter (3Q 2008): -28.14%

As of September 30, 2017, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 11.64%.

Average Annual Total Returns For the calendar year ended December 31, 2016

Average Annual Total Returns - American Century Growth Funds - ADAPTIVE ALL CAP FUND		Label	1 Year	5 Years	10 Years	Since Inception	Inception Date
Russell 3000 Value Index		Russell 3000® Index    (reflects no deduction for fees, expenses or taxes)	12.74%	14.65%	7.07%
INVESTOR CLASS		Investor Class Return Before Taxes	10.88%	13.43%	6.74%		May 31, 2006
INVESTOR CLASS | After Taxes on Distributions		Return After Taxes on Distributions	10.62%	13.21%	6.55%		May 31, 2006
INVESTOR CLASS | After Taxes on Distributions and Sales		Return After Taxes on Distributions and Sale of Fund Shares	6.37%	10.77%	5.42%		May 31, 2006
I CLASS		I Class Return Before Taxes	11.09%	13.66%	6.95%		May 31, 2006
ADVISOR CLASS		Advisor Class Return Before Taxes	10.64%	13.17%	6.47%		May 31, 2006
R CLASS		R Class Return Before Taxes	10.36%	12.88%	6.19%		May 31, 2006
R5 CLASS	[1]	R5 Class1 Return Before Taxes	11.09%	13.66%	6.95%		Apr. 10, 2017
R6 CLASS		R6 Class Return Before Taxes				2.37%	Dec. 01, 2016

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.

American Century Growth Funds | FOCUSED DYNAMIC GROWTH FUND

Focused Dynamic Growth Fund

Investment Objective 

The fund seeks long-term capital growth. 

Fees and Expenses

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

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees - USD ($)	INVESTOR CLASS	I CLASS		ADVISOR CLASS	R CLASS	R6 CLASS
Maximum Account Fee | American Century Growth Funds | FOCUSED DYNAMIC GROWTH FUND	$ 25	none	[1]	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 - American Century Growth Funds - FOCUSED DYNAMIC GROWTH FUND		INVESTOR CLASS	I CLASS	ADVISOR CLASS	R CLASS	R6 CLASS
Management Fees (as a percentage of Assets)		1.10%	0.90%	1.10%	1.10%	0.75%
Distribution and Service (12b-1) Fees		none	none	0.25%	0.50%	none
Other Expenses (as a percentage of Assets):		none	none	none	none	none
Expenses (as a percentage of Assets)		1.10%	0.90%	1.35%	1.60%	0.75%
Fee Waiver or Reimbursement	[1]	0.08%	0.08%	0.08%	0.08%	0.08%
Net Expenses (as a percentage of Assets)		1.02%	0.82%	1.27%	1.52%	0.67%

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 and that you earn a 5% return each year. You may be required to pay brokerage commissions on your purchases of Investor or I Class shares of the fund, which are not reflected in the example. The example also assumes that the fund’s operating expenses remain the same, except that it reflects the rate and duration of any fee waivers noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 

Expense Example - American Century Growth Funds - FOCUSED DYNAMIC GROWTH FUND - USD ($)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
INVESTOR CLASS	104	342	599	1,333
I CLASS	84	279	491	1,101
ADVISOR CLASS	130	420	732	1,616
R CLASS	155	498	864	1,892
R6 CLASS	69	232	410	923

Portfolio Turnover

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 21% of the average value of its portfolio.

Principal Investment Strategies

The portfolio managers look for stocks of early and rapid stage growth companies they believe will increase in value over time. The portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on broad economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. Under normal market conditions, the fund will invest in 30 to 45 securities.

The portfolio managers use a variety of analytical research tools and techniques to identify the stocks of companies that meet their investment criteria. Under normal market conditions, the portfolio managers seek securities of companies whose earnings or revenues are not only growing, but growing at an accelerated pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate relative to factors including recent trends, market expectations, peers and historical data. Among other variables, the portfolio managers will consider the fund’s growth and momentum profile relative to the benchmark. Other analytical techniques help identify additional signs of business improvement, such as increasing or the expectation of increasing cash flows, or other indications of financial health. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Although the portfolio managers intend to invest the fund’s assets primarily in U.S. securities, the fund may invest in securities of foreign companies when these securities meet the portfolio managers’ standards of selection.

The fund may engage in active and frequent trading of portfolio securities to achieve its principal investment strategies. This may cause higher transaction costs and may affect performance. It may also result in the realization and distribution of capital gains.

Principal Risks

• Growth Stocks - Investments in growth stocks may be more volatile than other stocks and the overall stock market. These stocks are typically priced higher than other stocks because of their growth potential, which may or may not be realized. These risks may even be greater for early and rapid stage growth companies.

• Issuer Focus Risk - Under normal market conditions, the fund will invest in 30 to 45 securities. As result, the fund’s performance may be more volatile than the performance of funds holding more securities.

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

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

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

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

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

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

Fund Performance

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

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

Calendar Year Total Returns

Highest Performance Quarter (3Q 2009): 18.48% Lowest Performance Quarter (3Q 2008): -22.37%

As of September 30, 2017, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 27.68%.

Average Annual Total Returns For the calendar year ended December 31, 2016

Average Annual Total Returns - American Century Growth Funds - FOCUSED DYNAMIC GROWTH FUND	Label	1 Year	5 Years	10 Years	Since Inception	Inception Date
Russell 1000 Growth Index	Russell 1000® Growth Index    (reflects no deduction for fees, expenses or taxes)	7.08%	14.48%	8.33%		May 31, 2006
INVESTOR CLASS	Investor Class Return Before Taxes	5.69%	10.87%	5.88%		May 31, 2006
INVESTOR CLASS | After Taxes on Distributions	Return After Taxes on Distributions	5.41%	10.53%	5.58%		May 31, 2006
INVESTOR CLASS | After Taxes on Distributions and Sales	Return After Taxes on Distributions and Sale of Fund Shares	3.46%	8.65%	4.72%		May 31, 2006
I CLASS	I Class Return Before Taxes	5.88%	11.10%	6.09%		May 31, 2006
ADVISOR CLASS	Advisor Class Return Before Taxes	5.39%	10.59%	5.61%		May 31, 2006
R CLASS	R Class Return Before Taxes	5.16%	10.32%	5.36%		May 31, 2006
R6 CLASS	R6 Class Return Before Taxes				0.73%	Dec. 01, 2016

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

[1] Prior to April 10, 2017, this class was referred to as the Institutional Class.

[1] Historical performance for the R5 Class prior to its inception is based on the performance of I Class shares, which have the same expenses as the R5 Class.

[1] Prior to April 10, 2017, this class was referred to as the Institutional Class.

[1] The advisor has agreed to waive 0.08 percentage points of the fund’s management fee. The advisor expects this waiver to continue until November 30, 2018, and cannot terminate it prior to such date without the approval of the Board of Directors.

XML

Label

Element

Value

Prospectus:

rr_ProspectusTable

Document Type

dei_DocumentType

485BPOS

Document Period End Date

dei_DocumentPeriodEndDate

Jul. 31, 2017

Entity Registrant Name

dei_EntityRegistrantName

AMERICAN CENTURY GROWTH FUNDS, INC.

Central Index Key

dei_EntityCentralIndexKey

0001353176

Amendment Flag

dei_AmendmentFlag

false

Document Creation Date

dei_DocumentCreationDate

Nov. 28, 2017

Document Effective Date

dei_DocumentEffectiveDate

Dec. 01, 2017

Prospectus Date

rr_ProspectusDate

Dec. 01, 2017

American Century Growth Funds | ADAPTIVE ALL CAP FUND

Prospectus:

rr_ProspectusTable

Risk/Return [Heading]

rr_RiskReturnHeading

Adaptive All Cap Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks long-term capital growth.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

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

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 105% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

105.00%

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. You may be required to pay brokerage commissions on your purchases of Investor or I Class shares of the fund, which are not reflected in the example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The fund uses an approach to common stock investing developed by the fund’s investment advisor. This approach relies heavily on quantitative tools to identify attractive investment opportunities, regardless of company size, industry type or geographic location, on a disciplined, consistent basis.

The portfolio managers use these quantitative tools to rank stocks from most attractive to least attractive in a model that uses factors that the advisor believes are predictive of a stock’s performance. These factors can be classified into two categories, one related to general market conditions and the other related to stock specific criteria. Factors related to general market conditions help determine the importance of the stock specific criteria, which may include those related to valuation, quality, growth and sentiment. The managers also use portfolio optimization to provide a balance between risk and expected return.

The fund may engage in active and frequent trading of portfolio securities to achieve its principal investment strategies. This may cause higher transaction costs and may affect the fund’s performance. It may also result in the realization and distribution of capital gains.

In addition to investing in U.S. companies, the fund may invest in securities of foreign companies, including companies located in emerging markets when these securities meet the portfolio managers’ standards of selection.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

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

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

• Growth Stocks - Investments in growth stocks may be more volatile than other stocks and the overall stock market. These stocks are typically priced higher than other stocks because of their growth potential, which may or may not be realized.

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

• High Turnover - The fund’s portfolio turnover may be high when compared to a “buy and hold” fund strategy. This could result in relatively high commission costs, which could hurt the fund’s performance, and create tax liabilities for the fund’s shareholders.

• Foreign Securities - The fund may invest in foreign securities, which can be riskier than investing in U.S. securities. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries. Foreign investments may be significant at times.

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

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

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

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

Risk Lose Money [Text]

rr_RiskLoseMoney

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

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Fund Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

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

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (3Q 2009): 16.39%Lowest Performance Quarter (3Q 2008): -28.14%

As of September 30, 2017, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 11.64%.

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2016

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.

American Century Growth Funds | ADAPTIVE ALL CAP FUND | Russell 3000 Value Index

Prospectus:

rr_ProspectusTable

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses or taxes)

Label

rr_AverageAnnualReturnLabel

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

1 Year

rr_AverageAnnualReturnYear01

12.74%

5 Years

rr_AverageAnnualReturnYear05

14.65%

10 Years

rr_AverageAnnualReturnYear10

7.07%

American Century Growth Funds | ADAPTIVE ALL CAP FUND | INVESTOR CLASS

Prospectus:

rr_ProspectusTable

Trading Symbol

dei_TradingSymbol

ACMNX

Maximum Account Fee

rr_MaximumAccountFee

$ 25

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

1.15%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

none

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

1.15%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 117

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

366

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

634

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,397

Annual Return 2007

rr_AnnualReturn2007

27.25%

Annual Return 2008

rr_AnnualReturn2008

(46.00%)

Annual Return 2009

rr_AnnualReturn2009

21.09%

Annual Return 2010

rr_AnnualReturn2010

17.18%

Annual Return 2011

rr_AnnualReturn2011

4.89%

Annual Return 2012

rr_AnnualReturn2012

12.83%

Annual Return 2013

rr_AnnualReturn2013

34.08%

Annual Return 2014

rr_AnnualReturn2014

11.95%

Annual Return 2015

rr_AnnualReturn2015

0.07%

Annual Return 2016

rr_AnnualReturn2016

10.88%

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

11.64%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

16.39%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(28.14%)

Label

rr_AverageAnnualReturnLabel

Investor Class Return Before Taxes

1 Year

rr_AverageAnnualReturnYear01

10.88%

5 Years

rr_AverageAnnualReturnYear05

13.43%

10 Years

rr_AverageAnnualReturnYear10

6.74%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | ADAPTIVE ALL CAP FUND | INVESTOR CLASS | After Taxes on Distributions

Prospectus:

rr_ProspectusTable

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

1 Year

rr_AverageAnnualReturnYear01

10.62%

5 Years

rr_AverageAnnualReturnYear05

13.21%

10 Years

rr_AverageAnnualReturnYear10

6.55%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | ADAPTIVE ALL CAP FUND | INVESTOR CLASS | After Taxes on Distributions and Sales

Prospectus:

rr_ProspectusTable

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

1 Year

rr_AverageAnnualReturnYear01

6.37%

5 Years

rr_AverageAnnualReturnYear05

10.77%

10 Years

rr_AverageAnnualReturnYear10

5.42%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | ADAPTIVE ALL CAP FUND | I CLASS

Prospectus:

rr_ProspectusTable

Trading Symbol

dei_TradingSymbol

ACMHX

Maximum Account Fee

rr_MaximumAccountFee

none

^[1]

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.95%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

none

Expenses (as a percentage of Assets)

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

Label

rr_AverageAnnualReturnLabel

I Class Return Before Taxes

1 Year

rr_AverageAnnualReturnYear01

11.09%

5 Years

rr_AverageAnnualReturnYear05

13.66%

10 Years

rr_AverageAnnualReturnYear10

6.95%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | ADAPTIVE ALL CAP FUND | ADVISOR CLASS

Prospectus:

rr_ProspectusTable

Trading Symbol

dei_TradingSymbol

ACMFX

Maximum Account Fee

rr_MaximumAccountFee

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

1.15%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

none

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

1.40%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 143

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

444

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

767

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,679

Label

rr_AverageAnnualReturnLabel

Advisor Class Return Before Taxes

1 Year

rr_AverageAnnualReturnYear01

10.64%

5 Years

rr_AverageAnnualReturnYear05

13.17%

10 Years

rr_AverageAnnualReturnYear10

6.47%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | ADAPTIVE ALL CAP FUND | R CLASS

Prospectus:

rr_ProspectusTable

Trading Symbol

dei_TradingSymbol

ACMEX

Maximum Account Fee

rr_MaximumAccountFee

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

1.15%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

none

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

1.65%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 168

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

521

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

898

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,953

Label

rr_AverageAnnualReturnLabel

R Class Return Before Taxes

1 Year

rr_AverageAnnualReturnYear01

10.36%

5 Years

rr_AverageAnnualReturnYear05

12.88%

10 Years

rr_AverageAnnualReturnYear10

6.19%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | ADAPTIVE ALL CAP FUND | R5 CLASS

Prospectus:

rr_ProspectusTable

Trading Symbol

dei_TradingSymbol

ACMUX

Maximum Account Fee

rr_MaximumAccountFee

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.95%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

none

Expenses (as a percentage of Assets)

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

Label

rr_AverageAnnualReturnLabel

R5 Class1 Return Before Taxes

^[2]

1 Year

rr_AverageAnnualReturnYear01

11.09%

^[2]

5 Years

rr_AverageAnnualReturnYear05

13.66%

^[2]

10 Years

rr_AverageAnnualReturnYear10

6.95%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 10, 2017

^[2]

American Century Growth Funds | ADAPTIVE ALL CAP FUND | R6 CLASS

Prospectus:

rr_ProspectusTable

Trading Symbol

dei_TradingSymbol

ACMMX

Maximum Account Fee

rr_MaximumAccountFee

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

none

Expenses (as a percentage of Assets)

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

Label

rr_AverageAnnualReturnLabel

R6 Class Return Before Taxes

Since Inception

rr_AverageAnnualReturnSinceInception

2.37%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 2016

American Century Growth Funds | FOCUSED DYNAMIC GROWTH FUND

Prospectus:

rr_ProspectusTable

Risk/Return [Heading]

rr_RiskReturnHeading

Focused Dynamic Growth Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective 

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks long-term capital growth. 

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

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

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

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

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

November 30, 2018

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 21% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

21.00%

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 and that you earn a 5% return each year. You may be required to pay brokerage commissions on your purchases of Investor or I Class shares of the fund, which are not reflected in the example. The example also assumes that the fund’s operating expenses remain the same, except that it reflects the rate and duration of any fee waivers noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The portfolio managers look for stocks of early and rapid stage growth companies they believe will increase in value over time. The portfolio managers make their investment decisions based primarily on their analysis of individual companies, rather than on broad economic forecasts. Management of the fund is based on the belief that, over the long term, stock price movements follow growth in earnings, revenues and/or cash flow. Under normal market conditions, the fund will invest in 30 to 45 securities.

The portfolio managers use a variety of analytical research tools and techniques to identify the stocks of companies that meet their investment criteria. Under normal market conditions, the portfolio managers seek securities of companies whose earnings or revenues are not only growing, but growing at an accelerated pace. This includes companies whose growth rates, although still negative, are less negative than prior periods, and companies whose growth rates are expected to accelerate relative to factors including recent trends, market expectations, peers and historical data. Among other variables, the portfolio managers will consider the fund’s growth and momentum profile relative to the benchmark. Other analytical techniques help identify additional signs of business improvement, such as increasing or the expectation of increasing cash flows, or other indications of financial health. These techniques help the portfolio managers buy or hold the stocks of companies they believe have favorable growth prospects and sell the stocks of companies whose characteristics no longer meet their criteria.

Although the portfolio managers intend to invest the fund’s assets primarily in U.S. securities, the fund may invest in securities of foreign companies when these securities meet the portfolio managers’ standards of selection.

The fund may engage in active and frequent trading of portfolio securities to achieve its principal investment strategies. This may cause higher transaction costs and may affect performance. It may also result in the realization and distribution of capital gains.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Growth Stocks - Investments in growth stocks may be more volatile than other stocks and the overall stock market. These stocks are typically priced higher than other stocks because of their growth potential, which may or may not be realized. These risks may even be greater for early and rapid stage growth companies.

• Issuer Focus Risk - Under normal market conditions, the fund will invest in 30 to 45 securities. As result, the fund’s performance may be more volatile than the performance of funds holding more securities.

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

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

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

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

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

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

Risk Lose Money [Text]

rr_RiskLoseMoney

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

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Fund Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

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

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

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

americancentury.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Performance Quarter (3Q 2009): 18.48% Lowest Performance Quarter (3Q 2008): -22.37%

As of September 30, 2017, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 27.68%.

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the calendar year ended December 31, 2016

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. 

American Century Growth Funds | FOCUSED DYNAMIC GROWTH FUND | Russell 1000 Growth Index

Prospectus:

rr_ProspectusTable

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses or taxes)

Label

rr_AverageAnnualReturnLabel

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

1 Year

rr_AverageAnnualReturnYear01

7.08%

5 Years

rr_AverageAnnualReturnYear05

14.48%

10 Years

rr_AverageAnnualReturnYear10

8.33%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | FOCUSED DYNAMIC GROWTH FUND | INVESTOR CLASS

Prospectus:

rr_ProspectusTable

Trading Symbol

dei_TradingSymbol

ACFOX

Maximum Account Fee

rr_MaximumAccountFee

$ 25

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

1.10%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

none

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

1.10%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[3]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

1.02%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 104

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

342

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

599

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,333

Annual Return 2007

rr_AnnualReturn2007

46.81%

Annual Return 2008

rr_AnnualReturn2008

(46.88%)

Annual Return 2009

rr_AnnualReturn2009

19.16%

Annual Return 2010

rr_AnnualReturn2010

7.62%

Annual Return 2011

rr_AnnualReturn2011

5.68%

Annual Return 2012

rr_AnnualReturn2012

7.50%

Annual Return 2013

rr_AnnualReturn2013

36.77%

Annual Return 2014

rr_AnnualReturn2014

11.86%

Annual Return 2015

rr_AnnualReturn2015

(3.57%)

Annual Return 2016

rr_AnnualReturn2016

5.69%

Year to Date Return, Label

rr_YearToDateReturnLabel

Investor Class year-to-date

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

27.68%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Performance Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.48%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Performance Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.37%)

Label

rr_AverageAnnualReturnLabel

Investor Class Return Before Taxes

1 Year

rr_AverageAnnualReturnYear01

5.69%

5 Years

rr_AverageAnnualReturnYear05

10.87%

10 Years

rr_AverageAnnualReturnYear10

5.88%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | FOCUSED DYNAMIC GROWTH FUND | INVESTOR CLASS | After Taxes on Distributions

Prospectus:

rr_ProspectusTable

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

1 Year

rr_AverageAnnualReturnYear01

5.41%

5 Years

rr_AverageAnnualReturnYear05

10.53%

10 Years

rr_AverageAnnualReturnYear10

5.58%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | FOCUSED DYNAMIC GROWTH FUND | INVESTOR CLASS | After Taxes on Distributions and Sales

Prospectus:

rr_ProspectusTable

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

1 Year

rr_AverageAnnualReturnYear01

3.46%

5 Years

rr_AverageAnnualReturnYear05

8.65%

10 Years

rr_AverageAnnualReturnYear10

4.72%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | FOCUSED DYNAMIC GROWTH FUND | I CLASS

Prospectus:

rr_ProspectusTable

Trading Symbol

dei_TradingSymbol

ACFSX

Maximum Account Fee

rr_MaximumAccountFee

none

^[4]

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.90%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

none

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.90%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[3]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

0.82%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 84

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

279

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

491

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,101

Label

rr_AverageAnnualReturnLabel

I Class Return Before Taxes

1 Year

rr_AverageAnnualReturnYear01

5.88%

5 Years

rr_AverageAnnualReturnYear05

11.10%

10 Years

rr_AverageAnnualReturnYear10

6.09%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | FOCUSED DYNAMIC GROWTH FUND | ADVISOR CLASS

Prospectus:

rr_ProspectusTable

Trading Symbol

dei_TradingSymbol

ACFDX

Maximum Account Fee

rr_MaximumAccountFee

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

1.10%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

none

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

1.35%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[3]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

1.27%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 130

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

420

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

732

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,616

Label

rr_AverageAnnualReturnLabel

Advisor Class Return Before Taxes

1 Year

rr_AverageAnnualReturnYear01

5.39%

5 Years

rr_AverageAnnualReturnYear05

10.59%

10 Years

rr_AverageAnnualReturnYear10

5.61%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | FOCUSED DYNAMIC GROWTH FUND | R CLASS

Prospectus:

rr_ProspectusTable

Trading Symbol

dei_TradingSymbol

ACFCX

Maximum Account Fee

rr_MaximumAccountFee

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

1.10%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

none

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

1.60%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[3]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

1.52%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 155

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

498

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

864

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,892

Label

rr_AverageAnnualReturnLabel

R Class Return Before Taxes

1 Year

rr_AverageAnnualReturnYear01

5.16%

5 Years

rr_AverageAnnualReturnYear05

10.32%

10 Years

rr_AverageAnnualReturnYear10

5.36%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 31, 2006

American Century Growth Funds | FOCUSED DYNAMIC GROWTH FUND | R6 CLASS

Prospectus:

rr_ProspectusTable

Trading Symbol

dei_TradingSymbol

ACFNX

Maximum Account Fee

rr_MaximumAccountFee

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

none

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.75%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[3]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

0.67%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 69

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

232

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

410

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 923

Label

rr_AverageAnnualReturnLabel

R6 Class Return Before Taxes

Since Inception

rr_AverageAnnualReturnSinceInception

0.73%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 01, 2016

[1] Prior to April 10, 2017, this class was referred to as the Institutional Class.

[2] Historical performance for the R5 Class prior to its inception is based on the performance of I Class shares, which have the same expenses as the R5 Class.

[3] The advisor has agreed to waive 0.08 percentage points of the fund’s management fee. The advisor expects this waiver to continue until November 30, 2018, and cannot terminate it prior to such date without the approval of the Board of Directors.

[4] Prior to April 10, 2017, this class was referred to as the Institutional Class.