XML 29 R3.htm IDEA: XBRL DOCUMENT v3.24.0.1
Label Element Value
AB Discovery Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading AB Discovery Value 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, hold and sell shares of the Fund. 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. 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 67 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 136 of the Fund’s Statement of Additional Information (“SAI”).
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 February 28, 2025
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 52% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 52.00%
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 eight 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, that the Fund’s operating expenses
stay the same and that any fee waiver and/or expense limitation is in effect for only the first year. 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 Fund invests primarily in a diversified portfolio of equity securities of small- to mid-capitalization U.S. companies. Under normal circumstances, the Fund invests at least 80% of its net assets in securities of small- to mid-capitalization companies. For purposes of this policy, small- to mid-capitalization companies are those that, at the time of investment, fall within the capitalization range between the smallest company in the Russell 2500® Value Index and the greater of $5 billion or the market capitalization of the largest company in the Russell 2500® Value Index.
Because the Fund’s definition of small- to mid-capitalization companies is dynamic, the lower and upper limits on market capitalization will change with the markets. As of December 31, 2023, the capitalization ranges of companies in the Russell 2500® Value Index ranged from approximately $11.7 million to $22.3 billion.
The Fund invests in companies that are determined by the Adviser to be undervalued, using the Adviser’s fundamental value approach. In selecting securities for the Fund’s portfolio, the Adviser uses its fundamental and quantitative research to identify companies whose long-term earnings power is not reflected in the current market price of their securities.
In selecting securities for the Fund’s portfolio, the Adviser looks for companies with attractive valuation and compelling success factors (for example, momentum and return on equity). The Adviser then uses this information to calculate an expected return. Returns and rankings are updated on a daily basis. The rankings are used to determine prospective candidates for further fundamental research and, subsequently, possible addition to the portfolio. Typically, the Adviser’s fundamental research analysts focus their research on the most attractive 20% of the universe.
The Adviser typically projects a company’s financial performance over a full economic cycle, including a trough and a peak, within the context of forecasts for real economic growth, inflation and interest rate changes. The Adviser focuses on the valuation implied by the current price, relative to the earnings the company will be generating five years from now, or “normalized” earnings, assuming average mid-economic cycle growth for the fifth year.
The Fund’s management team and other senior investment professionals work in close collaboration to weigh each investment opportunity identified by the research staff relative to the entire portfolio and determine the timing and position size for purchases and sales. Analysts remain responsible for monitoring new developments that would affect the securities they cover. The team will generally sell a security when it no longer meets appropriate valuation criteria, although sales may be delayed when positive return trends are favorable. Typically, growth in the size of a company’s market capitalization relative to other domestically traded companies will not cause the Fund to dispose of the security.
The Adviser seeks to manage overall portfolio volatility relative to the universe of companies that comprise the lowest 20% of the total U.S. market capitalization by favoring promising securities that offer the best balance between return and targeted risk. At times, the Fund may favor or disfavor a particular sector compared to that universe of companies. The Fund may invest significantly in companies involved in certain sectors that constitute a material portion of the universe of small- and mid-capitalization companies, such as financial services and consumer services.
The Fund may enter into derivatives transactions, such as options, futures contracts, forwards, and swaps. The Fund may use options strategies involving the purchase and/or writing of various combinations of call and/or put options, including on individual securities and stock indices, futures contracts (including futures contracts on individual securities and stock indices) or shares of exchange-traded funds (“ETFs”). These transactions may be used, for example, in an effort to earn extra income, to adjust exposure to individual securities or markets, or to protect all or a portion of the Fund’s portfolio from a decline in value, sometimes within certain ranges.
The Fund may invest in securities issued by non-U.S. companies.
The Fund may, at times, invest in shares of ETFs in lieu of making direct investments in equity securities. ETFs may provide more efficient and economical exposure to the type of companies and geographic locations in which the Fund seeks to invest than direct investments.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
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 Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The information for the Russell 2500™ Index is presented to show how the Fund’s performance compares with the returns of an index of securities similar to those in which the Fund invests.
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 Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Calendar Year End (%) During the period shown in the bar chart, the Fund’s: Best Quarter was up 29.04%, 4th quarter, 2020; and Worst Quarter was down -36.61%, 1st quarter, 2020.
Performance Table Heading rr_PerformanceTableHeading Performance Table Average Annual Total Returns (For the periods ended December 31, 2023)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns: – Are estimates 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 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.
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 Discovery Value Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock As with all investments, you may lose money by investing in the Fund.
AB Discovery Value Fund | Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
Market Risk: The value of the Fund’s assets will fluctuate as the market or markets in which the Fund invests 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) and regional and global conflicts, that affect large portions of the market. It includes the risk that a particular style of investing may be underperforming the market generally.
AB Discovery Value Fund | Capitalization Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
Capitalization Risk: Investments in small- and mid-capitalization companies may be more volatile than investments in large-capitalization companies. Investments in small-capitalization companies may have additional risks because these companies have limited product lines, markets or financial resources.
AB Discovery Value Fund | Foreign Non U S Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
Foreign (Non-U.S.) Risk: Investments in securities of non-U.S. issuers may involve more risk than those of U.S. issuers. These securities may fluctuate more widely in price and may be more difficult to trade due to adverse market, economic, political, regulatory or other factors.
AB Discovery Value Fund | Currency Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
Currency Risk: Fluctuations in currency exchange rates may negatively affect the value of the Fund’s investments or reduce its returns.
AB Discovery Value Fund | Derivatives Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
Derivatives Risk: Derivatives may be difficult to price or unwind and leveraged so that small changes may produce disproportionate losses for the Fund. A short position in a derivative instrument involves the risk of a theoretically unlimited increase in the value of the underlying asset, reference rate or index, which could cause the Fund to suffer a potentially unlimited loss. Derivatives, especially over-the-counter derivatives, are also subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Fund.
AB Discovery Value Fund | Management Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
•  
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, 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.
AB Discovery Value 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 rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.07%
Other Expenses rr_Component2OtherExpensesOverAssets 0.03% [2]
Total Other Expenses rr_OtherExpensesOverAssets 0.10%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.10%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3],[4]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.10%
After 1 Year rr_ExpenseExampleYear01 $ 532
After 3 Years rr_ExpenseExampleYear03 760
After 5 Years rr_ExpenseExampleYear05 1,005
After 10 Years rr_ExpenseExampleYear10 $ 1,708
2014 rr_AnnualReturn2014 8.61%
2015 rr_AnnualReturn2015 (5.89%)
2016 rr_AnnualReturn2016 24.38%
2017 rr_AnnualReturn2017 12.71%
2018 rr_AnnualReturn2018 (15.22%)
2019 rr_AnnualReturn2019 19.74%
2020 rr_AnnualReturn2020 3.11%
2021 rr_AnnualReturn2021 35.44%
2022 rr_AnnualReturn2022 (16.35%)
2023 rr_AnnualReturn2023 16.69%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 29.04%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (36.61%)
1 Year rr_AverageAnnualReturnYear01 11.75% [5]
5 Years rr_AverageAnnualReturnYear05 9.34% [5]
10 Years rr_AverageAnnualReturnYear10 6.62% [5]
AB Discovery Value 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% [6]
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.07%
Other Expenses rr_Component2OtherExpensesOverAssets 0.03% [2]
Total Other Expenses rr_OtherExpensesOverAssets 0.10%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.85%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3],[4]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.85%
After 1 Year rr_ExpenseExampleYear01 $ 288 [7]
After 3 Years rr_ExpenseExampleYear03 582
After 5 Years rr_ExpenseExampleYear05 1,001
After 10 Years rr_ExpenseExampleYear10 $ 1,973
1 Year rr_AverageAnnualReturnYear01 14.83%
5 Years rr_AverageAnnualReturnYear05 9.47%
10 Years rr_AverageAnnualReturnYear10 6.29%
AB Discovery Value 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 rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.07%
Other Expenses rr_Component2OtherExpensesOverAssets 0.03% [2]
Total Other Expenses rr_OtherExpensesOverAssets 0.10%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.85%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3],[4]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.85%
After 1 Year rr_ExpenseExampleYear01 $ 87
After 3 Years rr_ExpenseExampleYear03 271
After 5 Years rr_ExpenseExampleYear05 471
After 10 Years rr_ExpenseExampleYear10 $ 1,049
1 Year rr_AverageAnnualReturnYear01 16.98%
5 Years rr_AverageAnnualReturnYear05 10.57%
10 Years rr_AverageAnnualReturnYear10 7.36%
AB Discovery Value Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [8]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none [8]
Exchange Fee rr_ExchangeFeeOverRedemption none [8]
Management Fees rr_ManagementFeesOverAssets 0.75% [8]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50% [8]
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.29% [8]
Other Expenses rr_Component2OtherExpensesOverAssets 0.03% [2],[8]
Total Other Expenses rr_OtherExpensesOverAssets 0.32% [8]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.57% [8]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [4],[8]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.56% [8]
After 1 Year rr_ExpenseExampleYear01 $ 159
After 3 Years rr_ExpenseExampleYear03 495
After 5 Years rr_ExpenseExampleYear05 854
After 10 Years rr_ExpenseExampleYear10 $ 1,867
1 Year rr_AverageAnnualReturnYear01 16.12%
5 Years rr_AverageAnnualReturnYear05 9.82%
10 Years rr_AverageAnnualReturnYear10 6.66%
AB Discovery Value Fund | Class K  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [8]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none [8]
Exchange Fee rr_ExchangeFeeOverRedemption none [8]
Management Fees rr_ManagementFeesOverAssets 0.75% [8]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25% [8]
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.39% [8]
Other Expenses rr_Component2OtherExpensesOverAssets 0.03% [2],[8]
Total Other Expenses rr_OtherExpensesOverAssets 0.42% [8]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.42% [8]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3],[4],[8]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.42% [8]
After 1 Year rr_ExpenseExampleYear01 $ 145
After 3 Years rr_ExpenseExampleYear03 449
After 5 Years rr_ExpenseExampleYear05 776
After 10 Years rr_ExpenseExampleYear10 $ 1,702
1 Year rr_AverageAnnualReturnYear01 16.52%
5 Years rr_AverageAnnualReturnYear05 10.17%
10 Years rr_AverageAnnualReturnYear10 6.99%
AB Discovery Value Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [8]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none [8]
Exchange Fee rr_ExchangeFeeOverRedemption none [8]
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses rr_Component2OtherExpensesOverAssets 0.03% [2]
Total Other Expenses rr_OtherExpensesOverAssets 0.13%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.88%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3],[4]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.88%
After 1 Year rr_ExpenseExampleYear01 $ 90
After 3 Years rr_ExpenseExampleYear03 281
After 5 Years rr_ExpenseExampleYear05 488
After 10 Years rr_ExpenseExampleYear10 $ 1,084
1 Year rr_AverageAnnualReturnYear01 16.95%
5 Years rr_AverageAnnualReturnYear05 10.56%
10 Years rr_AverageAnnualReturnYear10 7.36%
AB Discovery Value Fund | Class Z  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [8]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none [8]
Exchange Fee rr_ExchangeFeeOverRedemption none [8]
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.02%
Other Expenses rr_Component2OtherExpensesOverAssets 0.03% [2]
Total Other Expenses rr_OtherExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.80%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3],[4]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.80%
After 1 Year rr_ExpenseExampleYear01 $ 82
After 3 Years rr_ExpenseExampleYear03 255
After 5 Years rr_ExpenseExampleYear05 444
After 10 Years rr_ExpenseExampleYear10 $ 990
1 Year rr_AverageAnnualReturnYear01 17.08%
5 Years rr_AverageAnnualReturnYear05 10.64%
10 Years rr_AverageAnnualReturnYear10 7.44%
AB Discovery Value Fund | Return After Taxes on Distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.08% [5]
5 Years rr_AverageAnnualReturnYear05 7.76% [5]
10 Years rr_AverageAnnualReturnYear10 4.85% [5]
AB Discovery Value Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.99% [5]
5 Years rr_AverageAnnualReturnYear05 7.07% [5]
10 Years rr_AverageAnnualReturnYear10 4.86% [5]
AB Discovery Value Fund | Russell 2500® Value Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.98%
5 Years rr_AverageAnnualReturnYear05 10.79%
10 Years rr_AverageAnnualReturnYear10 7.42%
AB Discovery Value Fund | Russell 2500™ Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 17.42% [9]
5 Years rr_AverageAnnualReturnYear05 11.67% [9]
10 Years rr_AverageAnnualReturnYear10 8.36% [9]
[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]
“Other Expenses” includes acquired fund fees and expenses totaling less than .01%.
[3]
Amount is less than .005%.
[4]
In connection with the Fund’s investments in AB Government Money Market Portfolio (the “Money Market Portfolio”) (except for the investment of any cash collateral from securities lending), the Adviser has contractually agreed to waive its management fee from the Fund and/or reimburse other expenses of the Fund in an amount equal to the Fund’s pro rata share of the Money Market Portfolio’s effective management fee. The agreement will remain in effect until February 28, 2025 and may only be terminated or changed with the consent of the Fund’s Board of Trustees. In addition, the agreement will be automatically extended for one-year terms unless the Adviser provides notice of termination to the Fund at least 60 days prior to the end of the period.
[5] 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 estimates 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.
[6]
For Class C shares, the CDSC is 0% after the first year. Class C shares automatically convert to Class A shares after eight years.
[7]
If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100.
[8]
Class R shares and Class K shares are no longer offered to new investors. Outstanding Class R shares and Class K shares will be liquidated on or about May 21, 2024.
[9]
The information for the Russell 2500™ Index is presented to show how the Fund’s performance compares with the returns of an index of securities similar to those in which the Fund invests.