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Prospectus Summary | NYLI WMC Value Fund  
Risk/Return: oef_RiskReturnAbstract  
Risk/Return [Heading] oef_RiskReturnHeading NYLI WMC Value Fund
Objective [Heading] oef_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock

The Fund seeks long-term appreciation of capital.
Expense Heading [Optional Text] oef_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] oef_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of 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 example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. In addition, different financial intermediary firms and financial professionals may impose different sales loads and waivers. More information about these and other discounts or waivers is available from your financial professional, in the "Information on Sales Charges" section starting on page 142 of the Prospectus and Appendix A – Intermediary-Specific Sales Charge Waivers and Discounts, and in the "Alternative Sales Arrangements" section on page 150 of the Statement of Additional Information.

Shareholder Fees Caption [Optional Text] oef_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] oef_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] oef_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] oef_PortfolioTurnoverTextBlock

The Fund 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 Fund shares are held in a taxable account. These costs, which are

not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 43% of the average value of its portfolio.

Portfolio Turnover, Rate oef_PortfolioTurnoverRate 43.00%
Expense Breakpoint Discounts [Text] oef_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] oef_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] oef_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] oef_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated whether or not you redeem all of your shares at the end of those periods (except as indicated with respect to Class C shares). The Example reflects Class C shares converting into Investor Class shares in years 9-10; expenses could be lower if you are eligible to convert to Class A shares instead. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects the contractual fee waiver and/or expense reimbursement arrangement, if applicable, for the current duration of the arrangement only. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] oef_ExpenseExampleByYearCaption Assuming redemption at end of period
Expense Example, No Redemption, By Year, Caption [Text] oef_ExpenseExampleNoRedemptionByYearCaption Assuming no redemption
Strategy [Heading] oef_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock

The Fund invests in equity securities issued by companies of any size or market capitalization range. While the Fund does not limit its investments to issuers within a particular capitalization range, it generally invests in large capitalization companies (as represented by the market capitalization range of the Russell 1000® Index, which ranged from $1 billion to $4.5 trillion as of December 31, 2025). The Fund may invest in securities of foreign issuers, including securities of emerging market country issuers. An issuer of a security is considered to be a U.S. or foreign issuer based on the issuer's "country of risk" (or similar designation) as determined by a third-party such as Bloomberg. Wellington Management Company LLP, the Fund’s Subadvisor (the “Subadvisor”), defines emerging market countries as those countries that are included in the MSCI Emerging Markets Index. The Fund may also invest in American Depositary Receipts.

Investment Process: The Subadvisor, seeks to identify companies that are financially sound but temporarily out-of-favor, and that provide above-average potential total returns at below average valuations. The Subadvisor employs a “bottom-up” approach to investment research and seeks to capitalize on investor behavioral biases by investing in companies with an attractive combination of valuation, quality, and capital return, and by taking a long-term view. Quality can be assessed across metrics including free cash flow margin, return on invested capital and net debt to EBITDA (earnings before interest, taxes, depreciation and amortization). The Subadvisor may sell stocks when the Subadvisor’s target price is achieved, the Subadvisor’s fundamental outlook with respect to the stock has changed, or in the event the Subadvisor believes more attractive investment alternatives exist. To better assess strategic business issues that impact the performance of a company, the Subadvisor may also give consideration to financially material environmental, social and/or governance (“ESG”) factors. The Subadvisor has discretion to determine the materiality of, as well as the level at which, financially relevant ESG factors are imbedded into its overall fundamental analysis when making an investment decision.
Bar Chart and Performance Table [Heading] oef_BarChartAndPerformanceTableHeading Past Performance
Performance Narrative [Text Block] oef_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns compare with those of a broad measure of market performance and an additional index over time. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The Fund has selected the Russell 3000® Index to represent a broad measure of market performance. The table also includes the average annual returns of the Russell 1000® Value Index, which is generally representative of the market sectors or types of investments in which the Fund invests.

Index returns reflect no deductions for fees, expenses or taxes, except for foreign withholding taxes where applicable.

Performance data for the classes varies based on differences in their fee and expense structures. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Please visit nylim.com/funds for more recent performance information.

One of the Fund's subadvisors changed effective January 9, 2017, and the Fund's principal investment strategies changed effective February 28, 2017 and March 13, 2017.

Effective April 26, 2021, the Fund replaced both of its subadvisors and modified its principal investment strategies. The past performance in the bar chart and table prior to that date reflects the Fund’s prior subadvisors and principal investment strategies.
Performance One Year or Less [Text] oef_PerformanceOneYearOrLess Performance data is not shown for classes with less than one calendar year of performance.
Performance Availability Website Address [Text] oef_PerformanceAvailabilityWebSiteAddress nylim.com/funds
Performance Past Does Not Indicate Future [Text] oef_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] oef_BarChartHeading Annual Returns, Class I Shares(by calendar year 2016-2025)
Bar Chart Does Not Reflect Sales Loads [Text] oef_BarChartDoesNotReflectSalesLoads Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown.
Bar Chart Closing [Text Block] oef_BarChartClosingTextBlock
   

Best Quarter

 

2020, Q2

22.20

%

Worst Quarter

 

2020, Q1

-25.79

%
Performance Table Heading oef_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Uses Highest Federal Rate oef_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred oef_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] oef_PerformanceTableOneClassOfAfterTaxShown After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary.
Performance Table Explanation after Tax Higher oef_PerformanceTableExplanationAfterTaxHigher In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period.
Performance Table Narrative oef_PerformanceTableNarrativeTextBlock After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary.
Prospectus Summary | NYLI WMC Value Fund | Principal Risks  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock
Principal Risks

You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The investments selected by the Subadvisor may underperform the market in which the Fund invests or other investments. The Fund may receive large purchase or redemption orders which may have adverse effects on performance if the Fund were required to sell securities, invest cash or hold a relatively large amount of cash at times when it would not otherwise do so.

The principal risks of investing in the Fund are summarized below. The relative significance of each principal risk summarized below may change over time.
Prospectus Summary | NYLI WMC Value Fund | Risk Lose Money [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock You can lose money by investing in the Fund.
Prospectus Summary | NYLI WMC Value Fund | Risk Not Insured Depository Institution [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.
Prospectus Summary | NYLI WMC Value Fund | Market Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Market Risk: Changes in markets may cause the value of investments to fluctuate, which could cause the Fund to underperform other funds with similar investment objectives and strategies. Such changes may be rapid and unpredictable. From time to time, markets may experience periods of stress as a result of various market, economic, social and geopolitical factors (including responses to government actions or interventions), such as the imposition (or the threatened imposition) of tariffs for potentially prolonged periods that may result in: (i) increased market volatility; (ii) reduced market liquidity; and (iii) increased redemptions of shares. Certain securities may be difficult to value under such conditions, and such conditions may add significantly to the risk of volatility in the net asset value of the Fund's shares and adversely affect the Fund and its investments.

Prospectus Summary | NYLI WMC Value Fund | Portfolio Management Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Portfolio Management Risk: The investment strategies, practices and risk analyses used by the Subadvisors may not produce the desired results or expected returns. The Subadvisor may give consideration to certain ESG criteria when evaluating an investment opportunity. The application of ESG criteria may result in the Fund (i) having exposure to certain securities or industry sectors that are different than the composition of the Fund's benchmark; and (ii) performing differently than other funds and strategies in its peer group that do not take into account ESG criteria or the Fund's benchmark.

Prospectus Summary | NYLI WMC Value Fund | Equity Securities Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Equity Securities Risk: Investments in common stocks and other equity securities are particularly subject to the risk of changing economic, stock market, industry and company conditions and the risks inherent in the ability to anticipate such changes that can adversely affect the value of portfolio holdings.
Prospectus Summary | NYLI WMC Value Fund | Value Stock Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Value Stock Risk: Value stocks may never reach what the Subadvisors believe is their full value or they may go down in value. In addition, different types of stocks tend to shift in and out of favor depending on market and economic conditions, and therefore the Fund's performance may be lower or higher than that of funds that invest in other types of equity securities.
Prospectus Summary | NYLI WMC Value Fund | Market Capitalization Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Market Capitalization Risk: Investments in securities issued by small-, mid-, or large-cap companies will be subject to the risks associated with securities issued by companies of the applicable market capitalization.  Securities of small-cap and mid-cap companies may be subject to greater price volatility, significantly lower trading volumes, cyclical, static or moderate growth prospects and greater spreads between their bid and ask prices than securities of larger companies. Smaller capitalization companies frequently rely on narrower product lines and niche markets and may be more vulnerable to adverse business or market developments.  Securities issued by larger companies may have less growth potential and may not be able to attain the high growth rates of successful smaller companies, especially during strong economic periods.  In addition, larger companies may be less capable of responding quickly to competitive challenges and industry changes, including those resulting from

improvements in technology, and may suffer sharper price declines as a result of earnings disappointments.  There is a risk that the securities issued by companies of a certain market capitalization may underperform the broader market at any given time.
Prospectus Summary | NYLI WMC Value Fund | Foreign Securities Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Foreign Securities Risk: An issuer of a security is considered to be a U.S. or foreign issuer based on the issuer’s “country of risk” (or similar designation) as determined by a third party such as Bloomberg (or another similar third party). The issuer’s “country of risk” is determined based on a number of criteria, which may change from time to time and currently include, but are not limited to, its country of domicile, the primary stock exchange on which it trades, the location from which the majority of its revenue comes, and its reporting currency.

Investments in foreign (non-U.S.) securities may be riskier than investments in U.S. securities. Foreign regulatory regimes and securities markets can have less stringent investor protections and disclosure standards and less liquid trading markets than U.S. regulatory regimes and securities markets, and can experience political, social and economic developments (such as government expropriation, excessive taxation, political or social instability, trade restrictions (including tariffs) or economic sanctions) that may affect the value of investments in foreign securities. There can also be difficulty obtaining and enforcing judgments against issuers in foreign countries. Foreign securities may also subject the Fund's investments to changes in currency rates. Changes in the value of foreign currencies may make the return on an investment increase or decrease, unrelated to the quality or performance of the investment itself. Economic sanctions may be, and have been, imposed against certain countries, organizations, companies, entities and/or individuals. Economic sanctions and other similar governmental actions or developments could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell certain foreign securities or groups of foreign securities, and thus may make the Fund’s investments in such securities less liquid or more difficult to value. Such sanctions may also cause a decline in the value of securities issued by the sanctioned country or companies located in or economically tied to the sanctioned country. In addition, as a result of economic sanctions and other similar governmental actions or developments, the Fund may be forced to sell or otherwise dispose of foreign investments at inopportune times or prices. The Fund may seek to hedge against its exposure to changes in the value of foreign currency, but there is no guarantee that such hedging techniques will be successful in reducing any related foreign currency valuation risk. These risks may be greater with respect to securities of companies that conduct their business activities in emerging markets or whose securities are traded principally in emerging markets.
Prospectus Summary | NYLI WMC Value Fund | Depositary Receipts Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Depositary Receipts Risk: Investments in depositary receipts may entail the special risks of investing in foreign securities, including currency exchange fluctuations, government regulations, and the potential for political and economic instability.
Prospectus Summary | NYLI WMC Value Fund | Emerging Markets Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Emerging Markets Risk: The risks related to investing in foreign securities are generally greater with respect to securities of companies that conduct their business activities in emerging markets or whose securities are traded principally in emerging markets. The risks of investing in emerging markets are elevated under adverse market conditions and include: (i) smaller trading volumes for such securities and limited access to investments in the event of market closures (including due to local holidays), which result in a lack of liquidity and in greater price volatility; (ii) less government regulation, which could lead to market manipulation, and less extensive, transparent and frequent accounting, auditing, recordkeeping, financial reporting, corporate governance and other requirements, which limit the quality and availability of financial information; (iii) the absence of developed legal systems, including structures governing private or foreign investment or allowing for judicial redress (such as limits on rights and remedies available) for investment losses and injury to private property; (iv) loss resulting from problems in share registration and custody; (v) sensitivity to adverse political or social events affecting the region where an emerging market is located; (vi) particular sensitivity to economic and political disruptions, including adverse effects stemming from actual or threatened wars, military conflicts, sanctions, trade restrictions, recessions, depressions or other economic crises, or reliance on international or other forms of aid, including trade, taxation and development policies; and (vii) the nationalization of foreign deposits or assets.
Prospectus Summary | NYLI WMC Value Fund | Russell 3000® Index1  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Russell 3000® Index1 [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 17.15%
Average Annual Return, Percent oef_AvgAnnlRtrPct 13.15%
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.29%
Prospectus Summary | NYLI WMC Value Fund | Russell 1000® Value Index2  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Russell 1000® Value Index2 [2]
Average Annual Return, Percent oef_AvgAnnlRtrPct 15.91%
Average Annual Return, Percent oef_AvgAnnlRtrPct 11.33%
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.53%
Prospectus Summary | NYLI WMC Value Fund | Class A  
Risk/Return: oef_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) oef_MaximumDeferredSalesChargeOverOther 0.00% [3]
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.66% [4]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.11%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.02%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets 0.00% [5]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.02% [5]
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2027
Expenses Deferred Charges [Text Block] oef_ExpensesDeferredChargesTextBlock No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases referenced within “Information on Sales Charges” in the Shareholder Guide). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. For more information on contingent deferred sales charges, see “Sales Charges” in the Shareholder Guide.
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 648
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 857
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 1,082
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,729
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.05%
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.35%
Average Annual Return, Percent oef_AvgAnnlRtrPct 11.09%
Performance Inception Date oef_PerfInceptionDate Jun. 09, 1999
Prospectus Summary | NYLI WMC Value Fund | INVESTOR CLASS  
Risk/Return: oef_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.00%
Maximum Deferred Sales Charge (as a percentage) oef_MaximumDeferredSalesChargeOverOther 0.00% [3]
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.66% [4]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.23%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets 0.00% [5]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.23% [5]
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2027
Expenses Deferred Charges [Text Block] oef_ExpensesDeferredChargesTextBlock No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases referenced within “Information on Sales Charges” in the Shareholder Guide). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. For more information on contingent deferred sales charges, see “Sales Charges” in the Shareholder Guide.
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 619
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 871
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 1,142
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,914
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.44%
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.20%
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.83%
Performance Inception Date oef_PerfInceptionDate Feb. 28, 2008
Prospectus Summary | NYLI WMC Value Fund | Class C  
Risk/Return: oef_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage) oef_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.66% [4]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.98%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets 0.00% [5]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.98% [5]
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2027
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 301
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 621
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 1,068
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 2,113
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 201
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 621
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 1,068
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 2,113
Average Annual Return, Percent oef_AvgAnnlRtrPct 12.26%
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.49%
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.62%
Performance Inception Date oef_PerfInceptionDate Jun. 09, 1999
Prospectus Summary | NYLI WMC Value Fund | Class I  
Risk/Return: oef_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage) oef_MaximumDeferredSalesChargeOverOther 0.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.66% [4]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.11%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.77%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.07%) [5]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.70% [5]
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2027
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 72
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 239
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 421
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 948
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 22.20%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn (25.79%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.73%
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.94%
Average Annual Return, Percent oef_AvgAnnlRtrPct 12.04%
Annual Return [Percent] oef_AnnlRtrPct 8.51%
Annual Return [Percent] oef_AnnlRtrPct 22.77%
Annual Return [Percent] oef_AnnlRtrPct (7.00%)
Annual Return [Percent] oef_AnnlRtrPct 31.78%
Annual Return [Percent] oef_AnnlRtrPct 13.59%
Annual Return [Percent] oef_AnnlRtrPct 26.37%
Annual Return [Percent] oef_AnnlRtrPct (4.52%)
Annual Return [Percent] oef_AnnlRtrPct 9.38%
Annual Return [Percent] oef_AnnlRtrPct 11.00%
Annual Return [Percent] oef_AnnlRtrPct 14.73%
Performance Inception Date oef_PerfInceptionDate Jan. 21, 1971
Prospectus Summary | NYLI WMC Value Fund | Class I | After Taxes on Distributions  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Percent oef_AvgAnnlRtrPct 12.68%
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.14%
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.20%
Prospectus Summary | NYLI WMC Value Fund | Class I | After Taxes on Distributions and Sales  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.89%
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.88%
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.20%
Prospectus Summary | NYLI WMC Value Fund | Class R6  
Risk/Return: oef_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage) oef_MaximumDeferredSalesChargeOverOther 0.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.66% [4]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.04%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.70%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets 0.00% [5]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.70% [5]
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2027
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 72
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 224
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 390
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 871
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.72%
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.47%
Performance Inception Date oef_PerfInceptionDate Apr. 26, 2021
[1] The Russell 3000® Index measures the performance of the largest 3,000 U.S. companies representing approximately 98% of the investable U.S. equity market.
[2] The Russell 1000® Value Index measures the performance of the large-cap value segment of the U.S. equity universe. It includes those Russell 1000® Index companies with lower price-to-book ratios and lower expected growth values.
[3] No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases referenced within “Information on Sales Charges” in the Shareholder Guide). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. For more information on contingent deferred sales charges, see “Sales Charges” in the Shareholder Guide.
[4] The management fee is as follows: 0.66% on assets up to $1 billion; 0.64% on assets from $1 billion to $3 billion; and 0.62% on assets over $3 billion.
[5] New York Life Investment Management LLC ("New York Life Investment Management") has contractually agreed to waive fees and/or reimburse expenses so that Total Annual Fund Operating Expenses (excluding taxes, interest, litigation, extraordinary expenses, Trustee expenses, brokerage and other transaction expenses relating to the purchase or sale of portfolio investments, and acquired (underlying) fund fees and expenses) for Class I shares do not exceed 0.70% of its average daily net assets. In addition, New York Life Investment Management will waive fees and/or reimburse expenses so that Total Annual Fund Operating Expenses (excluding taxes, interest, litigation, extraordinary expenses, brokerage and other transaction expenses relating to the purchase or sale of portfolio investments, and acquired (underlying) fund fees and expenses) for Class R6 do not exceed those of Class I. This agreement will remain in effect until February 28, 2027, and thereafter shall renew automatically for one-year terms unless New York Life Investment Management provides written notice of termination prior to the start of the next term or, at any time, upon approval of the Board of Trustees of the Fund.