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Lazard US Systematic Small Cap Equity Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Lazard US Systematic Small Cap Equity Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Portfolio seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
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 Portfolio, a series of The Lazard Funds, Inc. (the “Fund”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and the Example below.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Portfolio 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 May 1, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Portfolio 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 Portfolio shares are held in a taxable account. These costs, which are not reflected in annual portfolio

operating expenses or in the Example, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 110% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 110.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated and then hold or redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Portfolio’s operating expenses remain the same, giving effect to the expense limitation agreement described 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 invests primarily in equity securities, principally common stocks, of small capitalization US companies. The Investment Manager considers “small cap companies” to be those companies that, at the time of initial purchase by the Portfolio, have market capitalizations within the range of companies included in the Russell 2000 Index (ranging from approximately $16.6 million to $59.1 billion as of March 31, 2024). The Portfolio typically invests in 300 to 500 companies.

Under normal circumstances, the Portfolio invests at least 80% of its assets in equity securities of small cap US companies. Equity securities also may include depositary receipts, including American Depositary Receipts (“ADRs”), Global Depositary Receipts and European Depositary Receipts. The Portfolio may invest up to 20% of its assets in other securities which need not be equity securities of small cap US companies, including investments in larger US companies and in non-US companies, including securities of emerging markets companies traded on a US exchange.

The Investment Manager will manage the Portfolio using its proprietary investment strategy that creates and applies what the Investment Manager refers to as “Insights” and employs its “Insight-driven” process to identify investments with fundamental traits the Investment Manager believes are undervalued by the market. The Investment Manager’s strategy combines fundamental and quantitative techniques into a fully systematic process—that is, the Investment Manager converts subjective criteria used to evaluate potential investments into quantitative formulas based on, among other things, market observations and testing of resulting hypotheses. The Investment Manager considers an “Insight” to be a fundamental opportunity that the Investment Manager believes can be quantified, validated and implemented systematically by the Investment Manager:

· a fundamental opportunity is a recurring market inefficiency where the Investment Manager believes that investors are not fully incorporating the impact of a company’s changing operating fundamentals and/or attractive valuations;

· the Investment Manager converts its market observation into quantified conditions utilizing proprietary process knowledge and techniques;

· a potential Insight is validated through extensive proprietary testing that includes historical data, minimum targeted return objectives and persistence hurdles;

· through each Insight, a number of securities are identified; and

· the securities selection process is implemented systematically into automated daily operations.

The Investment Manager selects investments for the Portfolio by applying its securities selection process to an investable universe of all publicly-traded equity securities, with a focus on small cap companies. However, Insights, which may change over time, may be related to the broad market or specific to a particular sector or industry. In addition, the selection process described above is not sequential, and certain criteria may be given more importance than others. Target position sizes are determined at the time of investment based on one or more Insights and subsequently monitored on an ongoing basis. To improve tax efficiency, the Portfolio may limit investments that have undesirable tax characteristics and may employ other tax-management techniques, such as adjusting the timing of trades, by relying in part on fundamental research and analytical judgements of the Investment Manager.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Bar Chart and Table
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The accompanying bar chart and table provide some indication of the risks of investing in Lazard US Systematic Small Cap Equity Portfolio by showing the Portfolio’s year-by-year performance and its average annual performance compared to that of a broad measure of market performance. The bar chart shows how the performance of the Portfolio’s Institutional Shares has varied from year to year. Updated performance information is available at www.lazardassetmanagement.com or by calling (800) 823-6300. The Portfolio’s past performance (before and after taxes) is not necessarily an indication of how the Portfolio will perform in the future.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The accompanying bar chart and table provide some indication of the risks of investing in Lazard US Systematic Small Cap Equity Portfolio by showing the Portfolio’s year-by-year performance and its average annual performance compared to that of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 823-6300
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.lazardassetmanagement.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance (before and after taxes) is not necessarily an indication of how the Portfolio will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Total Returns for Institutional Shares As of 12/31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  

Best Quarter:

2023, Q4

11.79%

 

 

Worst Quarter:

2022, Q2

-13.86%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2023)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their 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 only for Institutional Shares. After-tax returns of the Portfolio’s other share classes will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

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

Effective as of May 1, 2024, the Russell 3000 Index replaced the Russell 2000 Index as the Portfolio’s broad-based securities market index. The Russell 3000 Index was selected in connection with certain regulatory requirements to provide a broad measure of market performance.
Lazard US Systematic Small Cap Equity Portfolio | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

The value of your investment in the Portfolio will fluctuate, which means you could lose money.
Lazard US Systematic Small Cap Equity Portfolio | Market Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Market Risk: The Portfolio may incur losses due to declines in one or more markets in which it invests. These declines may be the result of, among other things, political, regulatory, market, economic or social developments affecting the relevant market(s). To the extent that such developments impact specific industries, market sectors, countries or geographic regions, the Portfolio’s investments in such industries, market sectors, countries and/or geographic regions can be expected to be particularly affected, especially if such investments are a significant

portion of its investment portfolio. In addition, turbulence in financial markets and reduced liquidity in equity, credit and/or fixed income markets may negatively affect many issuers, which could adversely affect the Portfolio. Global economies and financial markets are increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers worldwide. As a result, local, regional or global events such as war or military conflict, acts of terrorism, the spread of infectious illness or other public health issues, social unrest, supply chain disruptions, government defaults, government shutdowns, the imposition of sanctions and other similar measures, recessions or other events could have a significant negative impact on global economic and market conditions. For example, a public health or other emergency and aggressive responses taken by many governments or voluntarily imposed by private parties, including closing borders, restricting travel and imposing prolonged quarantines or similar restrictions, as well as the closure of, or operational changes to, many retail and other businesses, may have severe negative impacts on markets worldwide. Additionally, general market conditions may affect the value of a Portfolio’s securities, including changes in interest rates, currency rates or monetary policies.
Lazard US Systematic Small Cap Equity Portfolio | Issuer Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Issuer Risk: The value of a security may decline for a number of reasons which directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets or factors unrelated to the issuer’s value, such as investor perception.
Lazard US Systematic Small Cap Equity Portfolio | Small Cap Companies Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Small Cap Companies Risk: Small cap companies carry additional risks because their earnings tend to be less predictable, their share prices more volatile and their securities less liquid than larger, more established companies. The shares of small cap companies tend to trade less frequently than those of larger companies, which can have an adverse effect on the pricing of these securities and on the ability to sell these securities when the Investment Manager deems it appropriate.
Lazard US Systematic Small Cap Equity Portfolio | Quantitative Model Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Quantitative Model Risk: The success of the Portfolio’s investment strategy depends largely upon the effectiveness of the Investment Manager’s quantitative model. A quantitative model, such as the risk and other models used by the Investment Manager requires adherence to a systematic, disciplined process. The Investment Manager’s ability to monitor and, if necessary, adjust its quantitative model could be adversely affected by various factors including incorrect or outdated market and other data inputs. Factors that affect a security’s value can change over time, and these changes may not be reflected in the quantitative model. In addition, factors used in quantitative analysis and the weight placed on those factors may not be predictive of a security’s value.
Lazard US Systematic Small Cap Equity Portfolio | Depositary Receipts Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Depositary Receipts Risk: ADRs and similar depositary receipts typically will be subject to certain of the risks associated with direct investments in the securities of non-US companies, because their values depend on the performance of the underlying non-US securities. However, currency fluctuations will impact investments in depositary receipts differently than direct investments in non-US dollar-denominated non-US securities, because a depositary receipt will not appreciate in value solely as a result of appreciation in the currency in which the underlying non-US dollar security is denominated.
Lazard US Systematic Small Cap Equity Portfolio | Non-US Securities Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Non-US Securities Risk: The Portfolio’s performance will be influenced by political, social and economic factors affecting the non-US countries and companies in which the Portfolio invests. Non-US securities carry special risks, such as less developed or less efficient trading markets, political instability, a lack of company information, differing auditing and legal standards, and, potentially, less liquidity. Non-US securities may be subject to economic sanctions or other similar governmental actions or developments, which could, among other things, effectively restrict or eliminate the Portfolio’s ability to purchase or sell certain foreign securities. To the extent the Portfolio holds securities subject to such actions, the securities may become difficult to value and/or less liquid (or illiquid). In some cases, the securities may become worthless. In addition, investments denominated in currencies other than US dollars may experience a decline in value, in US dollar terms, due solely to fluctuations in currency exchange rates. Emerging market countries can generally have economic structures that are less diverse and mature, and political systems that are less stable, than those of developed countries.
Lazard US Systematic Small Cap Equity Portfolio | Securities Selection Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Securities Selection Risk: Securities and other investments selected by the Investment Manager for the Portfolio may not perform to expectations. This could result in the Portfolio’s underperformance compared to other funds with similar investment objectives or strategies.
Lazard US Systematic Small Cap Equity Portfolio | High Portfolio Turnover Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

High Portfolio Turnover Risk: The Portfolio’s investment strategy may involve high portfolio turnover (such as 100% or more). A portfolio turnover rate of 100%, for example, is equivalent to the Portfolio buying and selling all of its securities once during the course of the year. A high portfolio turnover rate could result in high transaction costs and an increase in taxable capital gains distributions to the Portfolio’s shareholders, which will reduce returns to shareholders.
Lazard US Systematic Small Cap Equity Portfolio | Russell 3000 Index  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index
1 Year rr_AverageAnnualReturnYear01 25.96%
Lazard US Systematic Small Cap Equity Portfolio | Russell 2000 Index  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel Russell 2000 Index
1 Year rr_AverageAnnualReturnYear01 16.93%
Lazard US Systematic Small Cap Equity Portfolio | Institutional  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.70%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.67%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.07%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.44%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.47% [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.97% [2]
1 Year rr_ExpenseExampleYear01 $ 99
3 Years rr_ExpenseExampleYear03 409
5 Years rr_ExpenseExampleYear05 742
10 Years rr_ExpenseExampleYear10 $ 1,684
Annual Return 2022 rr_AnnualReturn2022 (16.33%)
Annual Return 2023 rr_AnnualReturn2023 19.80%
Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.79%
Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.86%)
1 Year rr_AverageAnnualReturnYear01 19.80%
Since Inception rr_AverageAnnualReturnSinceInception 1.40%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 29, 2021
Lazard US Systematic Small Cap Equity Portfolio | Institutional | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 19.70%
Since Inception rr_AverageAnnualReturnSinceInception 1.23%
Lazard US Systematic Small Cap Equity Portfolio | Institutional | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 11.79%
Since Inception rr_AverageAnnualReturnSinceInception 1.04%
Lazard US Systematic Small Cap Equity Portfolio | Institutional | Russell 3000 Index  
Risk/Return: rr_RiskReturnAbstract  
Since Inception rr_AverageAnnualReturnSinceInception 1.90%
Lazard US Systematic Small Cap Equity Portfolio | Institutional | Russell 2000 Index  
Risk/Return: rr_RiskReturnAbstract  
Since Inception rr_AverageAnnualReturnSinceInception (4.19%)
Lazard US Systematic Small Cap Equity Portfolio | Open  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.70%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 3.64%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.07%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 4.66%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 3.44% [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.22% [2]
1 Year rr_ExpenseExampleYear01 $ 124
3 Years rr_ExpenseExampleYear03 1,095
5 Years rr_ExpenseExampleYear05 2,072
10 Years rr_ExpenseExampleYear10 $ 4,544
1 Year rr_AverageAnnualReturnYear01 19.58%
Since Inception rr_AverageAnnualReturnSinceInception 1.20%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 29, 2021
Lazard US Systematic Small Cap Equity Portfolio | Open | Russell 3000 Index  
Risk/Return: rr_RiskReturnAbstract  
Since Inception rr_AverageAnnualReturnSinceInception 1.90%
Lazard US Systematic Small Cap Equity Portfolio | Open | Russell 2000 Index  
Risk/Return: rr_RiskReturnAbstract  
Since Inception rr_AverageAnnualReturnSinceInception (4.19%)
Lazard US Systematic Small Cap Equity Portfolio | R6  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.70%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 6.39%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.07%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 7.16%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 6.24% [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.92% [2]
1 Year rr_ExpenseExampleYear01 $ 94
3 Years rr_ExpenseExampleYear03 1,552
5 Years rr_ExpenseExampleYear05 2,948
10 Years rr_ExpenseExampleYear10 $ 6,183
Since Inception rr_AverageAnnualReturnSinceInception 11.48%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 22, 2023
Lazard US Systematic Small Cap Equity Portfolio | R6 | Russell 3000 Index  
Risk/Return: rr_RiskReturnAbstract  
Since Inception rr_AverageAnnualReturnSinceInception 20.09%
Lazard US Systematic Small Cap Equity Portfolio | R6 | Russell 2000 Index  
Risk/Return: rr_RiskReturnAbstract  
Since Inception rr_AverageAnnualReturnSinceInception 8.55%
[1] Reflects a contractual agreement by Lazard Asset Management LLC (the “Investment Manager”) to waive its fee and, if necessary, reimburse the Portfolio until May 1, 2025, to the extent Total Annual Portfolio Operating Expenses exceed .90%, 1.15% and .85% of the average daily net assets of the Portfolio’s Institutional Shares, Open Shares and R6 Shares, respectively, exclusive of taxes, brokerage, interest on borrowings, fees and expenses of “Acquired Funds,” fees and expenses related to filing foreign tax reclaims and extraordinary expenses. This expense limitation agreement can only be amended by agreement of the Fund, upon approval by the Fund’s Board of Directors, and the Investment Manager to lower the net amount shown and will terminate automatically in the event of termination of the Management Agreement between the Investment Manager and the Fund, on behalf of the Portfolio.
[2] Excluding Acquired Fund Fees and Expenses, the Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement are 90%, 1.15% and .85% of the Portfolio’s Institutional Shares, Open Shares and R6 Shares, respectively.