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Label Element Value
Prospectus: rr_ProspectusTable  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Jul. 31, 2018
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, 2018
Document Effective Date dei_DocumentEffectiveDate Dec. 01, 2018
Prospectus Date rr_ProspectusDate Dec. 01, 2018
American Century Growth Funds | ADAPTIVE SMALL CAP FUND  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading Adaptive Small 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 102% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 102.00%
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
Under normal market conditions, the fund will invest at least 80% of its net assets in small cap companies. The portfolio managers consider small cap companies to include those with a market capitalization that does not exceed that of the largest company in the Russell 2000® Index.
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 industry type or geographic location, on a disciplined, consistent basis.
The portfolio managers use these quantitative tools to rank stocks, primarily smaller companies, 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.
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.
•
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, 2018, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 3.99%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the calendar year ended December 31, 2017
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 SMALL CAP FUND | Russell 2000 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 2000® Index2   (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 14.65% [1]
5 Years rr_AverageAnnualReturnYear05 14.11% [1]
10 Years rr_AverageAnnualReturnYear10 8.70% [1]
Since Inception rr_AverageAnnualReturnSinceInception none [1]
American Century Growth Funds | ADAPTIVE SMALL CAP FUND | Russell 3000 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 21.13%
5 Years rr_AverageAnnualReturnYear05 15.57%
10 Years rr_AverageAnnualReturnYear10 8.59%
Since Inception rr_AverageAnnualReturnSinceInception none
American Century Growth Funds | ADAPTIVE SMALL 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 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.16%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 118
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 369
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 639
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,409
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%
Annual Return 2017 rr_AnnualReturn2017 17.71%
Year to Date Return, Label rr_YearToDateReturnLabel Investor Class year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 3.99%
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 17.71%
5 Years rr_AverageAnnualReturnYear05 14.40%
10 Years rr_AverageAnnualReturnYear10 5.92%
Since Inception rr_AverageAnnualReturnSinceInception none
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
American Century Growth Funds | ADAPTIVE SMALL CAP FUND | INVESTOR CLASS | After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 15.10%
5 Years rr_AverageAnnualReturnYear05 13.72%
10 Years rr_AverageAnnualReturnYear10 5.53%
Since Inception rr_AverageAnnualReturnSinceInception none
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
American Century Growth Funds | ADAPTIVE SMALL 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 11.37%
5 Years rr_AverageAnnualReturnYear05 11.47%
10 Years rr_AverageAnnualReturnYear10 4.68%
Since Inception rr_AverageAnnualReturnSinceInception none
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
American Century Growth Funds | ADAPTIVE SMALL CAP FUND | I CLASS  
Prospectus: rr_ProspectusTable  
Trading Symbol dei_TradingSymbol ACMHX
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 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 306
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 532
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,178
Label rr_AverageAnnualReturnLabel I Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.94%
5 Years rr_AverageAnnualReturnYear05 14.63%
10 Years rr_AverageAnnualReturnYear10 6.13%
Since Inception rr_AverageAnnualReturnSinceInception none
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
American Century Growth Funds | ADAPTIVE SMALL 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 0.01%
Expenses (as a percentage of Assets) 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
Label rr_AverageAnnualReturnLabel Advisor Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.41%
5 Years rr_AverageAnnualReturnYear05 14.11%
10 Years rr_AverageAnnualReturnYear10 5.65%
Since Inception rr_AverageAnnualReturnSinceInception none
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
American Century Growth Funds | ADAPTIVE SMALL 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 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.66%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 169
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 524
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 903
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,964
Label rr_AverageAnnualReturnLabel R Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.09%
5 Years rr_AverageAnnualReturnYear05 13.83%
10 Years rr_AverageAnnualReturnYear10 5.38%
Since Inception rr_AverageAnnualReturnSinceInception none
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2006
American Century Growth Funds | ADAPTIVE SMALL 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 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 306
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 532
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,178
Label rr_AverageAnnualReturnLabel R5 Class1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.98% [2]
5 Years rr_AverageAnnualReturnYear05 14.64% [2]
10 Years rr_AverageAnnualReturnYear10 6.13% [2]
Since Inception rr_AverageAnnualReturnSinceInception none [2]
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 10, 2017 [2]
American Century Growth Funds | ADAPTIVE SMALL 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 0.01%
Expenses (as a percentage of Assets) 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
Label rr_AverageAnnualReturnLabel R6 Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.14%
5 Years rr_AverageAnnualReturnYear05 none
10 Years rr_AverageAnnualReturnYear10 none
Since Inception rr_AverageAnnualReturnSinceInception 19.20%
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, 2019
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 29% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 29.00%
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 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: 
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, 2018, the most recent calendar quarter end, the fund’s Investor Class year-to-date return was 26.63%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns For the calendar year ended December 31, 2017
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 30.21%
5 Years rr_AverageAnnualReturnYear05 17.32%
10 Years rr_AverageAnnualReturnYear10 9.99%
Since Inception rr_AverageAnnualReturnSinceInception none
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 1.02% [3]
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 1.02%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.17%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.85%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 87
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 308
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 547
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,232
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%
Annual Return 2017 rr_AnnualReturn2017 34.55%
Year to Date Return, Label rr_YearToDateReturnLabel Investor Class year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 26.63%
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 34.55%
5 Years rr_AverageAnnualReturnYear05 15.96%
10 Years rr_AverageAnnualReturnYear10 4.96%
Since Inception rr_AverageAnnualReturnSinceInception none
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 34.55%
5 Years rr_AverageAnnualReturnYear05 15.70%
10 Years rr_AverageAnnualReturnYear10 4.76%
Since Inception rr_AverageAnnualReturnSinceInception none
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 19.56%
5 Years rr_AverageAnnualReturnYear05 12.85%
10 Years rr_AverageAnnualReturnYear10 3.92%
Since Inception rr_AverageAnnualReturnSinceInception none
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
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.82% [3]
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 0.82%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.17%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 67
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 245
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 439
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 998
Label rr_AverageAnnualReturnLabel I Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 34.83%
5 Years rr_AverageAnnualReturnYear05 16.21%
10 Years rr_AverageAnnualReturnYear10 5.17%
Since Inception rr_AverageAnnualReturnSinceInception none
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 1.02% [3]
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 1.27%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.17%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.10%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 387
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 681
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,518
Label rr_AverageAnnualReturnLabel Advisor Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 34.25%
5 Years rr_AverageAnnualReturnYear05 15.68%
10 Years rr_AverageAnnualReturnYear10 4.71%
Since Inception rr_AverageAnnualReturnSinceInception none
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 1.02% [3]
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 1.52%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.17%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.35%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 138
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 464
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 814
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,797
Label rr_AverageAnnualReturnLabel R Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 33.89%
5 Years rr_AverageAnnualReturnYear05 15.39%
10 Years rr_AverageAnnualReturnYear10 4.44%
Since Inception rr_AverageAnnualReturnSinceInception none
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 0.67% [3]
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 0.67%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.17%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 51
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 198
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 357
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 819
Label rr_AverageAnnualReturnLabel R6 Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 35.01%
5 Years rr_AverageAnnualReturnYear05 none
10 Years rr_AverageAnnualReturnYear10 none
Since Inception rr_AverageAnnualReturnSinceInception 32.85%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 01, 2016
[1] Effective May 7, 2018 the fund’s investment advisor has selected a different index for comparison purposes. The advisor believes the Russell 2000® Index is more reflective of the fund’s strategy.
[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 management fee has been restated to reflect the decrease in the management fee schedule effective August 1, 2018.
[4] The advisor has agreed to waive 0.17 percentage points of the fund’s management fee. The advisor expects this waiver to continue until November 30, 2019, and cannot terminate it prior to such date without the approval of the Board of Directors.