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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Lazard Global Strategic 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 and hold shares of the Portfolio.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
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 2016-08-29
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. For the period from August 29, 2014 (commencement of operations) through December 31, 2014, the Portfolio’s portfolio turnover rate was 24% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 24.00%rr_PortfolioTurnoverRate
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates “Other Expenses” are based on estimated amounts for the current fiscal year.
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 fee waiver and expense reimbursement arrangement 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 companies that the Investment Manager believes are undervalued based on their earnings, cash flow or asset values. The Investment Manager seeks to realize the Portfolio’s investment objective primarily through stock selection, investing in companies believed to have sustainably high or improving returns and trading at attractive valuations. The Portfolio may invest in securities of companies whose principal business activities are located in emerging market countries, and the allocation of the Portfolio’s assets to emerging market countries may vary from time to time. The Portfolio may invest in securities of companies across the capitalization spectrum.


Under normal circumstances, the Portfolio invests at least 80% of its assets in equity securities. In addition, under normal market conditions, the Portfolio invests significantly (at least 40%—unless market conditions are not deemed favorable by the Investment Manager, in which case the Portfolio would invest at least 30%) in non-US companies. The Investment Manager allocates the Portfolio’s assets among various regions and countries, including the United States (but in no less than three different countries). The allocation of the Portfolio’s assets among geographic sectors may shift from time to time based on the Investment Manager’s judgment and its analysis of market conditions.


Although the Portfolio is classified as “diversified” under the 1940 Act, it may invest in a smaller number of issuers than other, more diversified investment portfolios.

Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

The value of your investment in the Portfolio will fluctuate, which means you could lose money.


Market Risk. Market risks, including political, regulatory, market and economic developments, and developments that impact specific economic sectors, industries or segments of the market, can affect the value of the Portfolio’s investments. 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.


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.


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.


Emerging Market Risk. 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. The economies of countries with emerging markets may be based predominantly on only a few industries, may be highly vulnerable to changes in local or global trade conditions, and may suffer from extreme debt burdens or volatile inflation rates. The securities markets of emerging market countries have historically been extremely volatile. These market conditions may continue or worsen. Significant devaluation of emerging market currencies against the US dollar may occur subsequent to acquisition of investments denominated in emerging market currencies.


Foreign Currency Risk. 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. The Portfolio’s investments could be adversely affected by delays in, or a refusal to grant, repatriation of funds or conversion of emerging market currencies. The Investment Manager does not intend to actively hedge the Portfolio’s foreign currency exposure.


Focused Investing Risk. The Portfolio’s NAV may be more vulnerable to changes in the market value of a single issuer or group of issuers and may be relatively more susceptible to adverse effects from any single corporate, industry, economic, market, political or regulatory occurrence than if the Portfolio’s investments consisted of securities issued by a larger number of issuers.


Value Investing Risk. The Portfolio generally invests in stocks believed by the Investment Manager to be undervalued, but that may not realize their perceived value for extended periods of time or may never realize their perceived value. The stocks in which the Portfolio invests may respond differently to market and other developments than other types of stocks.


Large Cap Companies Risk. Investments in large cap companies may underperform other segments of the market when such other segments are in favor or because such companies may be less responsive to competitive challenges and opportunities and may be unable to attain high growth rates during periods of economic expansion.


Small and Mid Cap Companies Risk. Small and mid 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 and mid 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.

Risk Lose Money [Text] rr_RiskLoseMoney The value of your investment in the Portfolio will fluctuate, which means you could lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Bar Chart and Table
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Because the Portfolio did not have a full calendar year of performance prior to the date of this Prospectus, no performance returns are presented. Annual performance returns provide some indication of the risks of investing in the Portfolio by showing changes in performance from year to year. Comparison of Portfolio performance to an appropriate index indicates how the Portfolio’s average annual returns compare with those of a broad measure of market performance. Updated performance information is available at www.LazardNet.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 Annual performance returns provide some indication of the risks of investing in the Portfolio by showing changes in performance from year to year.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Because the Portfolio did not have a full calendar year of performance prior to the date of this Prospectus, no performance returns are presented.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 823-6300
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.LazardNet.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.
Institutional Shares
 
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)rr_RedemptionFeeOverRedemption
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Management Fees rr_ManagementFeesOverAssets 0.85%rr_ManagementFeesOverAssets
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Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.29%rr_OtherExpensesOverAssets
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[1]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.14%rr_ExpensesOverAssets
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Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%)rr_FeeWaiverOrReimbursementOverAssets
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[2]
Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.10%rr_NetExpensesOverAssets
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[2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 112rr_ExpenseExampleYear01
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Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 357rr_ExpenseExampleYear03
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Open Shares
 
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)rr_RedemptionFeeOverRedemption
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Management Fees rr_ManagementFeesOverAssets 0.85%rr_ManagementFeesOverAssets
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Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
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Other Expenses rr_OtherExpensesOverAssets 0.34%rr_OtherExpensesOverAssets
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[1]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.44%rr_ExpensesOverAssets
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Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%)rr_FeeWaiverOrReimbursementOverAssets
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[2]
Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.40%rr_NetExpensesOverAssets
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[2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 143rr_ExpenseExampleYear01
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Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 451rr_ExpenseExampleYear03
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R6 Shares
 
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)rr_RedemptionFeeOverRedemption
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Management Fees rr_ManagementFeesOverAssets 0.85%rr_ManagementFeesOverAssets
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Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.29%rr_OtherExpensesOverAssets
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[1]
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.14%rr_ExpensesOverAssets
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Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%)rr_FeeWaiverOrReimbursementOverAssets
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[2]
Total Annual Portfolio Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.05%rr_NetExpensesOverAssets
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[2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 107rr_ExpenseExampleYear01
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Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 350rr_ExpenseExampleYear03
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[1] "Other Expenses" are based on estimated amounts for the current fiscal year.
[2] Reflects a contractual agreement by the Investment Manager to waive its fee and, if necessary, reimburse the Portfolio through August 29, 2016 to the extent Total Annual Portfolio Operating Expenses exceed 1.10%, 1.40% and 1.05% 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" and extraordinary expenses, and excluding shareholder redemption fees or other transaction fees. This agreement can only be amended by agreement of the Fund, upon approval by the Board, and the Investment Manager to lower the net amount shown and will terminate automatically in the event of termination of the Investment Management Agreement between the Investment Manager and the Fund, on behalf of the Portfolio.