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AB SUSTAINABLE INTERNATIONAL THEMATIC FUND INC | AB SUSTAINABLE INTERNATIONAL THEMATIC FUND, INC.  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading AB Sustainable International Thematic 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 71 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 132 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)
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 28% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 28.00%
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
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent “Other Expenses” have been restated to reflect estimated current fiscal year expenses for Class Z shares, which are different than the expenses incurred in the initial year of operations for Class Z shares.
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 Fund invests primarily in a focused international portfolio of equity securities of companies whose business activities the Adviser believes position the company to benefit from certain sustainable investment themes that align with one or more of the United Nations Sustainable Development Goals (“SDGs”). These themes include the advancement of climate, health and empowerment. Under normal circumstances, the Fund invests at least 80% of its net assets in equity securities of issuers located outside of the United States that satisfy the Fund’s sustainability criteria. An issuer that derives at least 25% of its total revenues from activities consistent with the achievement of the SDGs meets such criteria, although many of the issuers in which the Fund invests will derive a much greater portion of their revenues from such activities.
The Adviser employs a combination of “top-down” and “bottom-up” investment processes with the goal of identifying, based on its internal research and analysis, securities of companies worldwide, that fit into sustainable investment themes. First, the Adviser identifies through its “top-down” process the sustainable investment themes. In addition to this “top-down” thematic approach, the Adviser then uses a “bottom-up” analysis of individual companies, focusing on prospective earnings growth, valuation, and quality of company management and on evaluating a company’s exposure to environmental, social and corporate governance (“ESG”) factors. ESG factors, which can vary across companies and industries, may include environmental impact, corporate governance, ethical business practices, diversity and employee practices, product safety, supply chain management and community impact. Eligible investments include securities of issuers that the Adviser believes will maximize total return while also contributing to positive societal impact aligned with one or more SDGs. While the Adviser emphasizes company-specific positive selection criteria over broad-based negative screens in assessing a company’s exposure to ESG factors, the Fund will not invest in companies that derive revenue from direct involvement in adult entertainment, alcohol, coal, controversial weapons, firearms, gambling, genetically modified organisms, military contracting, prisons, or tobacco.
The Adviser normally considers a large universe of mid- to large-capitalization companies worldwide for investment, but may invest in companies of any size. The Fund invests, under normal circumstances, in the equity securities of companies located in at least three countries (and normally substantially more) other than the United States. The Fund invests in securities of companies in both developed and emerging market countries, with the stock selection process determining the geographic distribution of the Fund’s investments. The Fund also invests in the equity securities of companies located in the United States with exposure to international markets. The Fund may sell securities that no longer meet the investment criteria described above.
Currencies can have a dramatic impact on equity returns, significantly adding to returns in some years and greatly diminishing them in others. Currency and equity positions are evaluated separately. The Adviser may seek to hedge the currency exposure resulting from securities positions when it finds the currency exposure unattractive. To hedge all or a portion of its currency risk, the Fund may, from time to time, invest in currency-related derivatives, including forward currency exchange contracts, futures contracts, options on futures contracts, swaps and options. The Adviser may also seek investment opportunities by taking long or short positions in currencies through the use of currency-related derivatives.
The Fund may enter into other 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.
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 stock or bond market fluctuates. The value of its 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 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 financial services 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. 
•  
ESG Risk: Applying ESG and sustainability criteria to the investment process may exclude securities of certain issuers for non-investment reasons and, therefore, the Fund may forgo some market opportunities available to funds that do not use ESG or sustainability criteria. Securities of companies with ESG practices may shift into and out of favor depending on market and economic conditions, and the Fund’s performance may at times be better or worse than the performance of funds that do not use ESG or sustainability criteria. Furthermore, ESG factors and “sustainability” criteria are not uniformly defined, and may differ from those used by other funds. In addition, in evaluating an investment, the investment adviser is dependent upon information and data that may be incomplete, inaccurate or unavailable, which could adversely affect the analysis of the ESG and sustainability factors relevant to a particular investment. 
•  
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. 
•  
Emerging Market Risk: Investments in emerging market countries may have more risk because the markets are less developed and less liquid as well as being subject to increased economic, political, regulatory or other uncertainties. 
•  
Currency Risk: Fluctuations in currency exchange rates may negatively affect the value of the Fund’s investments or reduce its returns. 
•  
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. 
•  
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 instrument, 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. 
•  
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.
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.
On January 8, 2018, the Fund implemented its current investment strategies (previously, the Fund’s investment strategies did not emphasize sustainable investment themes) and also changed its name from AB International Growth Fund to AB Sustainable International Thematic Fund. Accordingly, the performance shown below for periods prior to January 8, 2018 is based on the Fund’s prior investment strategies and may not be representative of the Fund’s performance under its current investment strategies. 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns how the Fund’s performance changed from year to year over ten years; andhow 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 Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. Through September 30, 2022, the year-to-date unannualized return for Class A shares was ‑35.26%.
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 22.99%, 2nd quarter, 2020; and Worst Quarter was down -18.42%, 1st quarter, 2020.
Performance Table Heading rr_PerformanceTableHeading Performance Table Average Annual Total Returns (For the periods ended December 31, 2021)
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 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 SUSTAINABLE INTERNATIONAL THEMATIC FUND INC | AB SUSTAINABLE INTERNATIONAL THEMATIC FUND, INC. | 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 0.65%
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
2012 rr_AnnualReturn2012 15.40%
2013 rr_AnnualReturn2013 13.30%
2014 rr_AnnualReturn2014 (1.41%)
2015 rr_AnnualReturn2015 (2.11%)
2016 rr_AnnualReturn2016 (7.10%)
2017 rr_AnnualReturn2017 34.46%
2018 rr_AnnualReturn2018 (17.34%)
2019 rr_AnnualReturn2019 26.87%
2020 rr_AnnualReturn2020 29.55%
2021 rr_AnnualReturn2021 8.06%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (35.26%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.99%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.42%)
1 Year rr_AverageAnnualReturnYear01 3.47% [2]
5 Years rr_AverageAnnualReturnYear05 13.59% [2]
10 Years rr_AverageAnnualReturnYear10 8.28% [2]
AB SUSTAINABLE INTERNATIONAL THEMATIC FUND INC | AB SUSTAINABLE INTERNATIONAL THEMATIC FUND, INC. | 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% [3]
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.06%
Other Expenses rr_Component2OtherExpensesOverAssets 0.08%
Total Other Expenses rr_OtherExpensesOverAssets 0.14%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.79%
After 1 Year rr_ExpenseExampleYear01 $ 282 [4]
After 3 Years rr_ExpenseExampleYear03 563
After 5 Years rr_ExpenseExampleYear05 970
After 10 Years rr_ExpenseExampleYear10 $ 1,905
1 Year rr_AverageAnnualReturnYear01 6.26%
5 Years rr_AverageAnnualReturnYear05 13.72%
10 Years rr_AverageAnnualReturnYear10 7.94%
AB SUSTAINABLE INTERNATIONAL THEMATIC FUND INC | AB SUSTAINABLE INTERNATIONAL THEMATIC FUND, INC. | 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 0.65%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.06%
Other Expenses rr_Component2OtherExpensesOverAssets 0.08%
Total Other Expenses rr_OtherExpensesOverAssets 0.14%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.79%
After 1 Year rr_ExpenseExampleYear01 $ 81
After 3 Years rr_ExpenseExampleYear03 252
After 5 Years rr_ExpenseExampleYear05 439
After 10 Years rr_ExpenseExampleYear10 $ 978
1 Year rr_AverageAnnualReturnYear01 8.39%
5 Years rr_AverageAnnualReturnYear05 14.87%
10 Years rr_AverageAnnualReturnYear10 9.04%
AB SUSTAINABLE INTERNATIONAL THEMATIC FUND INC | AB SUSTAINABLE INTERNATIONAL THEMATIC FUND, INC. | 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 rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.26%
Other Expenses rr_Component2OtherExpensesOverAssets 0.08%
Total Other Expenses rr_OtherExpensesOverAssets 0.34%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.49%
After 1 Year rr_ExpenseExampleYear01 $ 152
After 3 Years rr_ExpenseExampleYear03 471
After 5 Years rr_ExpenseExampleYear05 813
After 10 Years rr_ExpenseExampleYear10 $ 1,779
1 Year rr_AverageAnnualReturnYear01 7.61%
5 Years rr_AverageAnnualReturnYear05 14.16%
10 Years rr_AverageAnnualReturnYear10 8.42%
AB SUSTAINABLE INTERNATIONAL THEMATIC FUND INC | AB SUSTAINABLE INTERNATIONAL THEMATIC FUND, INC. | 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 rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.20%
Other Expenses rr_Component2OtherExpensesOverAssets 0.08%
Total Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.18%
After 1 Year rr_ExpenseExampleYear01 $ 120
After 3 Years rr_ExpenseExampleYear03 375
After 5 Years rr_ExpenseExampleYear05 649
After 10 Years rr_ExpenseExampleYear10 $ 1,432
1 Year rr_AverageAnnualReturnYear01 7.94%
5 Years rr_AverageAnnualReturnYear05 14.52%
10 Years rr_AverageAnnualReturnYear10 8.75%
AB SUSTAINABLE INTERNATIONAL THEMATIC FUND INC | AB SUSTAINABLE INTERNATIONAL THEMATIC FUND, INC. | 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 rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.11%
Other Expenses rr_Component2OtherExpensesOverAssets 0.08%
Total Other Expenses rr_OtherExpensesOverAssets 0.19%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.84%
After 1 Year rr_ExpenseExampleYear01 $ 86
After 3 Years rr_ExpenseExampleYear03 268
After 5 Years rr_ExpenseExampleYear05 466
After 10 Years rr_ExpenseExampleYear10 $ 1,037
1 Year rr_AverageAnnualReturnYear01 8.29%
5 Years rr_AverageAnnualReturnYear05 14.91%
10 Years rr_AverageAnnualReturnYear10 9.16%
AB SUSTAINABLE INTERNATIONAL THEMATIC FUND INC | AB SUSTAINABLE INTERNATIONAL THEMATIC FUND, INC. | 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 rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.65%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses: Transfer Agent rr_Component1OtherExpensesOverAssets 0.02%
Other Expenses rr_Component2OtherExpensesOverAssets 0.08% [5]
Total Other Expenses rr_OtherExpensesOverAssets 0.10%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.75% [5]
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 8.39% [6]
5 Years rr_AverageAnnualReturnYear05 14.93% [6]
10 Years rr_AverageAnnualReturnYear10 9.10% [6]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 26, 2021 [6]
AB SUSTAINABLE INTERNATIONAL THEMATIC FUND INC | AB SUSTAINABLE INTERNATIONAL THEMATIC FUND, INC. | Return After Taxes on Distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.04% [2]
5 Years rr_AverageAnnualReturnYear05 12.45% [2]
10 Years rr_AverageAnnualReturnYear10 7.70% [2]
AB SUSTAINABLE INTERNATIONAL THEMATIC FUND INC | AB SUSTAINABLE INTERNATIONAL THEMATIC FUND, INC. | Return After Taxes on Distributions and Sale of Fund Shares | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.00% [2]
5 Years rr_AverageAnnualReturnYear05 10.65% [2]
10 Years rr_AverageAnnualReturnYear10 6.65% [2]
AB SUSTAINABLE INTERNATIONAL THEMATIC FUND INC | AB SUSTAINABLE INTERNATIONAL THEMATIC FUND, INC. | MSCI ACWI Index (ex. U.S.) (Net) (reflects no deduction for fees, expenses, or taxes except the reinvestment of dividends of non-U.S. withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.82%
5 Years rr_AverageAnnualReturnYear05 9.61%
10 Years rr_AverageAnnualReturnYear10 7.28%
[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] 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.
[3]
For Class C shares, the CDSC is 0% after the first year. Class C shares automatically convert to Class A shares after eight years.
[4]
If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100.
[5] “Other Expenses” have been restated to reflect estimated current fiscal year expenses for Class Z shares, which are different than the expenses incurred in the initial year of operations for Class Z shares. Consequently, “Total Annual Fund Operating Expenses” for Class Z shares differ from the ratio of expenses to average net assets shown for Class Z shares in the Financial Highlights.
[6]
Inception date for Class Z shares: 7/26/21. Performance information for periods prior to the inception of Class Z shares is the performance of the Fund’s Class A shares adjusted to reflect the expenses of the Class Z shares.