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AB Concentrated Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading AB Concentrated Growth Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund’s investment objective is long-term growth of capital.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds.​​​​​​​ More information about these and other discounts is available from your financial intermediary and in Investing in the Funds—Sales Charge Reduction Programs for Class A Shares on page 65 of this Prospectus, in Appendix B—Financial Intermediary Waivers of this Prospectus and in Purchase of Shares—Sales Charge Reduction Programs for Class A Shares on page 127 of the Fund’s Statement of Additional Information (“SAI”).
You may be required to pay commissions and/or other forms of compensation to a broker for transactions in Advisor Class shares, which are not reflected in the tables or the examples below.
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 or 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 transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 23% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 23.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Purchases of Class A shares in amounts of $1,000,000 or more, or by certain group retirement plans, may be subject to a 1%,
1-year
contingent deferred sales charge, or CDSC, which may be subject to waiver in certain circumstances.For Class C shares, the CDSC is 0% after the first year. Class C shares automatically convert to Class A shares after ten years.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading Examples
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Examples assume 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. The Examples also assume that your investment has a 5% return each year and that the Fund’s operating expenses stay the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading PRINCIPAL STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Adviser seeks to achieve the Fund’s investment objective of long-term growth of capital by investing primarily in common stocks of listed U.S. companies. The Adviser employs an appraisal method that attempts to measure each prospective company’s quality and growth rate by numerous factors. Such factors include: a company’s record and projections of profit and earnings growth, accuracy and availability of information with respect to the company, success and experience of management, accessibility of management to the Fund’s Adviser, product lines and competitive position both in the United States and abroad, lack of cyclicality, large market capitalization and liquidity of the company’s securities. The Adviser compares these results to the general stock markets to determine the relative attractiveness of each company at a given time. The Adviser weighs economic, political and market factors in making investment decisions; this appraisal technique attempts to measure each investment candidate not only against other stocks of the same industry group, but also against a broad spectrum of investments. While the Fund primarily invests in companies that have market capitalizations of $5 billion or more, it may invest in companies that have market capitalizations of $3 billion to $5 billion.
The Fund invests in a relatively small number of individual stocks. The Fund is considered to be
“non-diversified”,
which means that the securities laws do not limit the percentage of its assets that it may invest in any one company (subject to certain limitations under the U.S. Internal Revenue Code of 1986, as amended (the “Code”)).
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
•
 
Market Risk:
The value of the Fund’s assets will fluctuate as the equity markets fluctuate. The value of the Fund’s investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events, including public health crises (including the occurrence of a contagious disease or illness), that affect large portions of the market. It includes the risk that a particular style of investing, such as growth, may underperform the market generally.
 
•
 
Focused Portfolio Risk:
Investments in a limited number of companies may have more risk because changes in the value of a single security may have a more significant effect, either negative or positive, on the Fund’s net asset value, or NAV.
 
•
 
Sector Risk:
The Fund may have more risk because it may invest to a significant extent in one or more particular market sectors, such as the information technology or health care sector. To the extent it does so, market or economic factors affecting the relevant sector(s) could have a major effect on the value of the Fund’s investments.
 
•
 
Capitalization Risk:
Investments in
mid-capitalization
companies may be more volatile and less liquid than investments in large-capitalization companies.
 
•
 
Non-diversification
Risk:
The Fund may have more risk because it is
“non-diversified”,
meaning that it can invest more of its assets in a smaller number of issuers. Accordingly, changes in the value of a single security may have a more significant effect, either negative or positive, on the Fund’s NAV.
 
•
 
Management Risk:
The Fund is subject to management risk because it is an actively-managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions for the Fund, but there is no guarantee that its techniques will produce the intended results. Some of these techniques may incorporate, or rely upon, quantitative models, but there is no guarantee that these models will generate accurate forecasts, reduce risk or otherwise perform as expected.
As with all investments, you may lose money by investing in the Fund.
Risk Lose Money [Text] rr_RiskLoseMoney As with all investments, you may lose money by investing in the Fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Non-diversification Risk: The Fund may have more risk because it is “non-diversified”, meaning that it can invest more of its assets in a smaller number of issuers. Accordingly, changes in the value of a single security may have a more significant effect, either negative or positive, on the Fund’s NAV.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading BAR CHART AND PERFORMANCE INFORMATION
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and performance information provide an indication of the historical risk of an investment in the Fund by showing:
 
•
 
how the Fund’s performance changed from year to year over ten years; and
 
•
 
how the Fund’s average annual returns for one, five and ten years compare to those of a broad-based securities market index.
You may obtain updated performance information on the Fund’s website at
www.abfunds.com
(click on “Investments—Mutual Funds”).
The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns •   how the Fund’s performance changed from year to year over ten years; and   •   how the Fund’s average annual returns for one, five and ten years compare to those of a broad-based securities market index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.abfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Bar Chart
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock The annual returns in the bar chart are for the Predecessor Fund’s shares for periods prior to its reorganization into Advisor Class shares of the Fund. Through September 30, 2020, the
year-to-date
unannualized return for Advisor Class shares was 7.85%.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the period shown in the bar chart, the Fund’s:
Best Quarter was up 18.74%, 1st quarter, 2019; and Worst Quarter was down
-12.73%,
2nd quarter, 2010.
Performance Table Heading rr_PerformanceTableHeading Performance Table Average Annual Total Returns (For the periods ended December 31, 2019)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns: –Are an estimate, which is based on the highest historical 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 After-tax returns: –Are not relevant to investors who hold fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns: –Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios;
AB Concentrated Growth Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.25%
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none [1]
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses rr_Component2OtherExpensesOverAssets 0.08%
Total Other Expenses rr_OtherExpensesOverAssets 0.13%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.03%
After 1 Year rr_ExpenseExampleYear01 $ 526
After 3 Years rr_ExpenseExampleYear03 739
After 5 Years rr_ExpenseExampleYear05 969
After 10 Years rr_ExpenseExampleYear10 $ 1,631
1 Year rr_AverageAnnualReturnYear01 33.37% [3],[4]
5 Years rr_AverageAnnualReturnYear05 11.97% [3],[4]
10 Years rr_AverageAnnualReturnYear10 13.45% [3],[4]
AB Concentrated Growth Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther 1.00% [5]
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses rr_Component2OtherExpensesOverAssets 0.08%
Total Other Expenses rr_OtherExpensesOverAssets 0.13%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.78%
After 1 Year rr_ExpenseExampleYear01 $ 281 [6]
After 3 Years rr_ExpenseExampleYear03 560
After 5 Years rr_ExpenseExampleYear05 964
After 10 Years rr_ExpenseExampleYear10 $ 2,095
1 Year rr_AverageAnnualReturnYear01 37.31% [4]
5 Years rr_AverageAnnualReturnYear05 12.11% [4]
10 Years rr_AverageAnnualReturnYear10 13.09% [4]
AB Concentrated Growth Fund | Advisor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.05%
Other Expenses rr_Component2OtherExpensesOverAssets 0.08%
Total Other Expenses rr_OtherExpensesOverAssets 0.13%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.78%
After 1 Year rr_ExpenseExampleYear01 $ 80
After 3 Years rr_ExpenseExampleYear03 249
After 5 Years rr_ExpenseExampleYear05 433
After 10 Years rr_ExpenseExampleYear10 $ 966
2010 rr_AnnualReturn2010 12.80%
2011 rr_AnnualReturn2011 0.81%
2012 rr_AnnualReturn2012 15.87%
2013 rr_AnnualReturn2013 36.44%
2014 rr_AnnualReturn2014 13.09%
2015 rr_AnnualReturn2015 1.32%
2016 rr_AnnualReturn2016 5.36%
2017 rr_AnnualReturn2017 23.01%
2018 rr_AnnualReturn2018 1.48%
2019 rr_AnnualReturn2019 39.67%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 7.85%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.74%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1273.00%)
1 Year rr_AverageAnnualReturnYear01 39.67%
5 Years rr_AverageAnnualReturnYear05 13.23%
10 Years rr_AverageAnnualReturnYear10 14.21%
AB Concentrated Growth Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.11%
Other Expenses rr_Component2OtherExpensesOverAssets 0.07%
Total Other Expenses rr_OtherExpensesOverAssets 0.18%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.33%
After 1 Year rr_ExpenseExampleYear01 $ 135
After 3 Years rr_ExpenseExampleYear03 421
After 5 Years rr_ExpenseExampleYear05 729
After 10 Years rr_ExpenseExampleYear10 $ 1,601
1 Year rr_AverageAnnualReturnYear01 38.99% [4]
5 Years rr_AverageAnnualReturnYear05 12.67% [4]
10 Years rr_AverageAnnualReturnYear10 13.65% [4]
AB Concentrated Growth Fund | Class K  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.09%
Other Expenses rr_Component2OtherExpensesOverAssets 0.07%
Total Other Expenses rr_OtherExpensesOverAssets 0.16%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.06%
After 1 Year rr_ExpenseExampleYear01 $ 108
After 3 Years rr_ExpenseExampleYear03 337
After 5 Years rr_ExpenseExampleYear05 585
After 10 Years rr_ExpenseExampleYear10 $ 1,294
1 Year rr_AverageAnnualReturnYear01 39.30% [4]
5 Years rr_AverageAnnualReturnYear05 12.95% [4]
10 Years rr_AverageAnnualReturnYear10 13.94% [4]
AB Concentrated Growth Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.04%
Other Expenses rr_Component2OtherExpensesOverAssets 0.07%
Total Other Expenses rr_OtherExpensesOverAssets 0.11%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.76%
After 1 Year rr_ExpenseExampleYear01 $ 78
After 3 Years rr_ExpenseExampleYear03 243
After 5 Years rr_ExpenseExampleYear05 422
After 10 Years rr_ExpenseExampleYear10 $ 942
1 Year rr_AverageAnnualReturnYear01 39.70% [4]
5 Years rr_AverageAnnualReturnYear05 13.25% [4]
10 Years rr_AverageAnnualReturnYear10 14.23% [4]
AB Concentrated Growth Fund | Class Z  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.02%
Other Expenses rr_Component2OtherExpensesOverAssets 0.08%
Total Other Expenses rr_OtherExpensesOverAssets 0.10%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.75%
After 1 Year rr_ExpenseExampleYear01 $ 77
After 3 Years rr_ExpenseExampleYear03 240
After 5 Years rr_ExpenseExampleYear05 417
After 10 Years rr_ExpenseExampleYear10 $ 930
1 Year rr_AverageAnnualReturnYear01 39.73% [4]
5 Years rr_AverageAnnualReturnYear05 13.26% [4]
10 Years rr_AverageAnnualReturnYear10 14.23% [4]
AB Concentrated Growth Fund | Return After Taxes on Distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 32.33% [3],[4]
5 Years rr_AverageAnnualReturnYear05 11.06% [3],[4]
10 Years rr_AverageAnnualReturnYear10 12.84% [3],[4]
AB Concentrated Growth Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 20.47% [3],[4]
5 Years rr_AverageAnnualReturnYear05 9.39% [3],[4]
10 Years rr_AverageAnnualReturnYear10 11.17% [3],[4]
AB Concentrated Growth Fund | S&P 500(R) Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 31.49%
5 Years rr_AverageAnnualReturnYear05 11.70%
10 Years rr_AverageAnnualReturnYear10 13.56%
[1] Purchases of Class A shares in amounts of $1,000,000 or more, or by certain group retirement plans, may be subject to a 1%, 1-year contingent deferred sales charge, or CDSC, which may be subject to waiver in certain circumstances.
[2] Management fees have been restated to reflect a contractual reduction in management fees effective May 7, 2020.
[3] After-tax returns: – Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios; – Are an estimate, which is based on the highest historical individual federal marginal income tax rates, and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and – Are not relevant to investors who hold fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
[4] Inception date for Class A, Class C, Class R, Class K, Class I and Class Z shares: 2/28/14. Performance information for periods prior to the inception of Class A, Class C, Class R, Class K, Class I and Class Z shares is the performance of the Fund’s Advisor Class shares adjusted to reflect the respective expense ratios of the Class A, Class C, Class R, Class K, Class I and Class Z shares.
[5] For Class C shares, the CDSC is 0% after the first year. Class C shares automatically convert to Class A shares after ten years.
[6] If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100.