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Class A Shares (NFAAX), Class C Shares (NFACX), Institutional Class Shares (NFALX) | Neuberger Berman Focus Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary
Objective [Heading] rr_ObjectiveHeading GOAL
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
These tables describe the fees and expenses that you may pay if you buy, hold or sell shares of the Fund. Under the Fund’s policies, you may qualify for initial sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Neuberger Berman funds. Certain financial intermediaries have sales charges and/or policies and procedures regarding sales charge waivers applicable to their customers that differ from those described below. More information about these and other discounts is available from your financial intermediary, in “Sales Charge Reductions and Waivers” on page 232 in the Fund’s prospectus, and in Appendix A to the Fund’s prospectus. Although the Fund does not impose any sales charge on Institutional Class shares, you may pay a commission to your broker on your purchases and sales of those shares, which is not reflected in this table.
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 % of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Aug. 31, 2023
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_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 operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 20% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 20.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock For Class A shares, a contingent deferred sales charge (“CDSC”) of 1.00% applies on certain redemptions made within 18 months following purchases of $1 million or more made without an initial sales charge. For Class C shares, the CDSC is eliminated one year after purchase.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts Under the Fund’s policies, you may qualify for initial sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Neuberger Berman funds. Certain financial intermediaries have sales charges and/or policies and procedures regarding sales charge waivers applicable to their customers that differ from those described below. More information about these and other discounts is available from your financial intermediary, in “Sales Charge Reductions and Waivers” on page 232 in the Fund’s prospectus, and in Appendix A to the Fund’s prospectus.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The expense example can help you compare costs among mutual funds. The example assumes that you invested $10,000 for the periods shown, that you redeemed all of your shares at the end of those periods, that the Fund earned a hypothetical 5% total return each year, and that the Fund’s expenses were those in the table. For Class A and Institutional Class shares, your costs would be the same whether you sold your shares or continued to hold them at the end of each period. Actual performance and expenses may be higher or lower.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption (assuming redemption)
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption (assuming no redemption)
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
To pursue its goal, the Fund invests in a concentrated portfolio, consisting mainly of common stocks of companies of any size that are selected using a fundamental, research driven approach.

Under normal market conditions, the Fund typically holds a limited number of stocks. Because of this, the Fund may at times be substantially over- and under-weighted in certain economic sectors.

The Portfolio Managers, with the assistance of Neuberger Berman research analysts, look for what they believe to be undervalued companies. Factors in identifying these firms may include depressed valuations, a history of above-average returns, an established market niche, and a belief that the company has sound future business prospects. This approach is designed to let the Fund benefit from potential increases in stock prices, while endeavoring to limit the risks typically associated with investing in a smaller number of stocks.

Although the Fund invests primarily in domestic stocks, it may also invest in stocks of foreign companies.

The Fund may invest in restricted securities, including private placements, which are securities that are subject to legal restrictions on their sale and may not be sold to the public unless registered under the applicable securities law or pursuant to an applicable exemption.

The Fund may also use options, including, but not limited to, buying and selling (writing) put and call options on individual stocks, to attempt to enhance returns. The Fund will only sell (write) call options on individual stocks if it simultaneously holds an equivalent position in the stock underlying the option (“covered call option”).

The Portfolio Managers follow a disciplined selling strategy and may sell a stock when it reaches a target valuation, if a company’s business fails to perform as expected, or when other opportunities appear more attractive.
Risk [Heading] rr_RiskHeading PRINCIPAL INVESTMENT RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Most of the Fund’s performance depends on what happens in the stock market, the Portfolio Managers' evaluation of those developments, and the success of the Portfolio Managers in implementing the Fund's investment strategies. The market's behavior can be difficult to predict, particularly in the short term. There can be no guarantee that the Fund will achieve its goal. The Fund may take temporary defensive and cash management positions; to the extent it does, it will not be pursuing its principal investment strategies.

The actual risk exposure taken by the Fund in its investment program will vary over time, depending on various factors including the Portfolio Managers' evaluation of issuer, political, regulatory, market, or economic developments. There can be no guarantee that the Portfolio Managers will be successful in their attempts to manage the risk exposure of the Fund or will appropriately evaluate or weigh the multiple factors involved in investment decisions, including issuer, market and/or instrument-specific analysis and valuation.

The Fund is a mutual fund, not a bank deposit, and is not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency. The value of your investment may fall, sometimes sharply, and you could lose money by investing in the Fund.

Each of the following risks, which are described in alphabetical order and not in order of importance, can significantly affect the Fund’s performance. The relative importance of, or potential exposure as a result of, each of these risks will vary based on market and other investment-specific considerations.

Depositary Receipts Risk. Depositary receipts are subject to the risk of fluctuation in the currency exchange rate if, as is often the case, the underlying foreign securities are denominated in foreign currency, and there may be an imperfect correlation between the market value of depositary receipts and the underlying foreign securities. In addition, depositary receipts involve many of the same risks of investing directly in the underlying foreign securities.

Foreign Risk. Foreign securities involve risks in addition to those associated with comparable U.S. securities. Additional risks include exposure to less developed or less efficient trading markets; social, political, diplomatic, or economic instability; trade barriers and other protectionist trade policies (including those of the U.S.); fluctuations in foreign currencies or currency redenomination; potential for default on sovereign debt; nationalization or expropriation of assets; settlement, custodial or other operational risks; higher transaction costs; confiscatory withholding or other taxes; and less stringent auditing, corporate disclosure, governance, and legal standards. As a result, foreign securities may fluctuate more widely in price, and may also be less liquid, than comparable U.S. securities. World markets, or those in a particular region, may all react in similar fashion to important economic or political developments. In addition, foreign markets may perform differently than the U.S. market. The effect of economic instability on specific foreign markets or issuers may be difficult to predict or evaluate. Regardless of where a company is organized or its stock is traded, its performance may be affected significantly by events in regions from which it derives its profits or in which it conducts significant operations.

Securities of issuers traded on foreign exchanges may be suspended, either by the issuers themselves, by an exchange or by governmental authorities. Trading suspensions may be applied from time to time to the securities of individual issuers for reasons specific to that issuer, or may be applied broadly by exchanges or governmental authorities in response to market events. In the event that the Fund holds material positions in such suspended securities, the Fund’s ability to liquidate its positions or provide liquidity to investors may be compromised and the Fund could incur significant losses.

High Portfolio Turnover. The Fund may engage in active and frequent trading and may have a high portfolio turnover rate, which may increase the Fund’s transaction costs, may adversely affect the Fund’s performance and may generate a greater amount of capital gain distributions to shareholders than if the Fund had a low portfolio turnover rate.

Issuer-Specific Risk. An individual security may be more volatile, and may perform differently, than the market as a whole.

The Fund's portfolio may contain fewer securities than the portfolios of other mutual funds, which increases the risk that the value of the Fund could go down because of the poor performance of one or a few investments.

Market Capitalization Risk. To the extent the Fund invests in securities of small-, mid-, or large-cap companies, it takes on the associated risks. At times, any one of these market capitalizations may be out of favor with investors. Compared to small- and mid-cap companies, large-cap companies may be unable to respond as quickly to changes and opportunities. Compared to large-cap companies, small- and mid-cap companies may depend on a more limited management group, may have a shorter history of operations, and may have limited product lines, markets or financial resources. The securities of small- and mid-cap companies are often more volatile and less liquid than the securities of larger companies and may be more affected than other types of securities by the underperformance of a sector or during market downturns.

Market Volatility Risk. Markets may be volatile and values of individual securities and other investments, including those of a particular type, may decline significantly in response to adverse issuer, political, regulatory, market, economic or other developments that may cause broad changes in market value, public perceptions concerning these developments, and adverse investor sentiment or publicity. Geopolitical risks may add to instability in world economies and markets generally. Changes in value may be temporary or may last for extended periods. If the Fund sells a portfolio position before it reaches its market peak, it may miss out on opportunities for better performance.

Options Risk. The use of options involves investment strategies and risks different from those associated with ordinary portfolio securities transactions. If a strategy is applied at an inappropriate time or market conditions or trends are judged incorrectly, the use of options may lower the Fund’s return. There can be no guarantee that the use of options will increase the Fund’s return or income. In addition, there may be an imperfect correlation between the movement in prices of options and the securities underlying them and there may at times not be a liquid secondary market for various options. An abrupt change in the price of an underlying security could render an option worthless. The prices of options are volatile and are influenced by, among other things, actual and anticipated changes in the value of the underlying instrument, or in interest or currency exchange rates, including the anticipated volatility of the underlying instrument (known as implied volatility), which in turn are affected by fiscal and monetary policies and by national and international political and economic events, as will the performance of the issuer of the underlying instrument. As such, prior to the exercise or expiration of the option, the Fund is exposed to implied volatility risk, meaning the value, as based on implied volatility, of an option may increase due to market and economic conditions or views based on the sector or industry in which issuers of the underlying instrument participate, including company-specific factors.

By writing put options, the Fund takes on the risk of declines in the value of the underlying instrument, including the possibility of a loss up to the entire strike price of each option it sells, but without the corresponding opportunity to benefit from potential increases in the value of the underlying instrument. When the Fund writes a put option, it assumes the risk that it must purchase the underlying instrument at a strike price that may be higher than the market price of the instrument. If there is a broad market decline and the Fund is not able to close out its written put options, it may result in substantial losses to the Fund. By writing a call option, the Fund may be obligated to deliver instruments underlying an option at less than the market price. When the Fund writes a covered call option, it gives up the opportunity to profit from a price increase in the underlying instrument above the strike price. If a covered call option that the Fund has written is exercised, the Fund will experience a gain or loss from the sale of the underlying instrument, depending on the price at which the Fund purchased the instrument and the strike price of the option. The Fund will receive a premium from writing options, but the premium received may not be sufficient to offset any losses sustained from exercised options. In the case of a covered call, the premium received may be offset by a decline in the market value of the underlying instrument during the option period. If an option that the Fund has purchased is never exercised or closed out, the Fund will lose the amount of the premium it paid and the use of those funds.

Private Placements and Other Restricted Securities Risk. Private placements and other restricted securities are securities that are subject to legal and/or contractual restrictions on their sales. These securities may not be sold to the public unless certain conditions are met, which may include registration under the applicable securities laws. As a result of the absence of a public trading market, the prices of these securities may be more difficult to determine than publicly traded securities and these securities may involve heightened risk as compared to investments in securities of publicly traded companies. Private placements and other restricted securities may be illiquid, and it frequently can be difficult to sell them at a time when it may otherwise be desirable to do so or the Fund may be able to sell them only at prices that are less than what the Fund regards as their fair market value. Transaction costs may be higher for these securities. In addition, the Fund may get only limited information about the issuer of a private placement or other restricted security.

Recent Market Conditions. Some countries, including the U.S., are adopting more protectionist trade policies and moving away from the tighter financial industry regulations that followed the 2008 financial crisis. The U.S. is also said to be considering significant new investments in infrastructure and national defense which, coupled with lower federal tax rates, could lead to sharply increased government borrowing and higher interest rates. The exact shape of these policies is still being worked out through the political process, but the equity and debt markets may react strongly to expectations, which could increase volatility, especially if the market’s expectations for changes in government policies are not borne out. Higher interest rates may further strengthen the already strong U.S. dollar, which may also harm U.S. companies that rely significantly on exports.

Although prices of many U.S. equity securities have increased substantially over several years, some market prognosticators reportedly believe market indicators point toward a period of decline. The economies of many other nations are weaker than that of the U.S., and economic weakness in U.S. trading partners may harm long-term growth in the U.S. The recent decisions by the Fed to lower a key interest rate may reflect concerns about the strength of the U.S. economy. Changes in U.S. law over the past decade may leave the federal government with fewer tools to address severe market dislocations in the future.

High public debt in the U.S. and other countries creates ongoing systemic and market risks and policymaking uncertainty. Interest rates have been unusually low in recent years in the U.S. and abroad. Because there is little precedent for this situation, it is difficult to predict the impact on various markets of a significant rate increase or other significant policy changes. There is a greater risk of rising interest rates than has historically been the case due to the current period of relatively low rates and the effect of government fiscal policy initiatives and potential market reaction to those initiatives.

National economies are increasingly interconnected, as are global financial markets, which increases the possibilities that conditions in one country or region might adversely impact issuers in a different country or region. The rise in protectionist trade policies, changes to some major international trade agreements and the potential for changes to others, could affect the economies of many nations in ways that cannot necessarily be foreseen at the present time. Equity markets in the U.S. and China seem very sensitive to the outlook for resolving the current U.S.-China “trade war.”

The impact of the United Kingdom’s vote to leave the European Union (the “EU”), commonly referred to as “Brexit,” is impossible to know for sure until it is implemented. The effect on the economies of the United Kingdom and the EU will likely depend on the nature of trade relations between the UK and the EU and other major economies following Brexit, which are subject to negotiation and the political processes of the nations involved. There is a tentative agreement between the UK and the EU setting out the terms of separation which, if approved by the UK Parliament, would likely mitigate many of the adverse effects of separation. If the UK separates from the EU without a formal agreement, it could be highly disruptive to the economies of both regions.

Redemption Risk. The Fund may experience periods of heavy redemptions that could cause the Fund to sell assets at inopportune times or at a loss or depressed value. Redemption risk is greater to the extent that one or more investors or intermediaries control a large percentage of investments in the Fund. In addition, redemption risk is heightened during periods of declining or illiquid markets. Heavy redemptions could hurt the Fund’s performance.

Sector Risk. From time to time, based on market or economic conditions, the Fund may have significant positions in one or more sectors of the market. To the extent the Fund invests more heavily in particular sectors, its performance will be especially sensitive to developments that significantly affect those sectors. Individual sectors may be more volatile, and may perform differently, than the broader market. The industries that constitute a sector may all react in the same way to economic, political or regulatory events.

Value Stock Risk. Value stocks may remain undervalued or may decrease in value during a given period or may not ever realize what the portfolio management team believes to be their full value. This may happen, among other reasons, because of a failure to anticipate which stocks or industries would benefit from changing market or economic conditions or investor preferences.

A summary of the Fund’s additional principal investment risks is as follows:

Risk of Increase in Expenses. A decline in the Fund’s average net assets during the current fiscal year due to market volatility or other factors could cause the Fund’s expenses for the current fiscal year to be higher than the expense information presented in “Fees and Expenses.”

Operational and Cybersecurity Risk. The Fund and its service providers, and your ability to transact with the Fund, may be negatively impacted due to operational matters arising from, among other problems, human errors, systems and technology disruptions or failures, or cybersecurity incidents. Cybersecurity incidents may allow an unauthorized party to gain access to fund assets, customer data, or proprietary information, or cause the Fund or its service providers, as well as the securities trading venues and their service providers, to suffer data corruption or lose operational functionality. It is not possible for the Manager or the other Fund service providers to identify all of the cybersecurity or other operational risks that may affect the Fund or to develop processes and controls to completely eliminate or mitigate their occurrence or effects. Most issuers in which the Fund invests are heavily dependent on computers for data storage and operations, and require ready access to the internet to conduct their business. Thus, cybersecurity incidents could also affect issuers of securities in which the Fund invests, leading to significant loss of value.

Risk Management. Risk is an essential part of investing. No risk management program can eliminate the Fund’s exposure to adverse events; at best, it may only reduce the possibility that the Fund will be affected by such events, and especially those risks that are not intrinsic to the Fund’s investment program. The Fund could experience losses if judgments about risk prove to be incorrect.

Valuation Risk. The Fund may not be able to sell an investment at the price at which the Fund has valued the investment. Such differences could be significant, particularly for illiquid securities and securities that trade in relatively thin markets and/or markets that experience extreme volatility. If market or other conditions make it difficult to value some investments, SEC rules and applicable accounting protocols may require the Fund to value these investments using more subjective methods, known as fair value methodologies. Using fair value methodologies to price investments may result in a value that is different from an investment’s most recent price and from the prices used by other mutual funds to calculate their NAVs. The Fund’s ability to value its investments in an accurate and timely manner may be impacted by technological issues and/or errors by third party service providers, such as pricing services or accounting agents.
Risk Lose Money [Text] rr_RiskLoseMoney The value of your investment may fall, sometimes sharply, and you could lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution The Fund is a mutual fund, not a bank deposit, and is not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following bar chart and table provide an indication of the risks of investing in the Fund. The bar chart shows how the Fund’s performance has varied from year to year, as represented by the performance of the Fund's Institutional Class. The returns in the bar chart do not reflect any applicable sales charges. If sales charges were reflected, returns would be lower than those shown. The table below the bar chart shows what the returns would equal if you averaged out actual performance over various lengths of time and compares the returns with the returns of a broad-based market index. The index, which is described in “Descriptions of Indices” in the prospectus, has characteristics relevant to the Fund's investment strategy. Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

For each class, the performance prior to June 21, 2010, is that of the Fund's Investor Class. Because Investor Class has lower expenses than Class A and Class C and has higher expenses than Institutional Class, its performance typically would have been better than that of Class A and Class C and lower than that of Institutional Class. Returns would have been lower if the Manager had not reimbursed certain expenses and/or waived a portion of the investment management fees during certain of the periods shown.

Past performance (before and after taxes) is not a prediction of future results. Visit www.nb.com or call 800-366-6264 for updated performance information.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart shows how the Fund’s performance has varied from year to year, as represented by the performance of the Fund's Institutional Class. The table below the bar chart shows what the returns would equal if you averaged out actual performance over various lengths of time and compares the returns with the returns of a broad-based market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-366-6264
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.nb.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not a prediction of future results.
Bar Chart [Heading] rr_BarChartHeading YEAR-BY-YEAR % RETURNS AS OF 12/31 EACH YEAR
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The returns in the bar chart do not reflect any applicable sales charges. If sales charges were reflected, returns would be lower than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best quarter:    Q2 '09, 16.21%

Worst quarter:    Q3 '11, -17.29%

Year-to-date performance as of 9/30/2019:     18.36%
Bar Chart, Returns for Class Not Offered in Prospectus [Text] rr_BarChartReturnsForClassNotOfferedInProspectus For each class, the performance prior to June 21, 2010, is that of the Fund's Investor Class. Because Investor Class has lower expenses than Class A and Class C and has higher expenses than Institutional Class, its performance typically would have been better than that of Class A and Class C and lower than that of Institutional Class.
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date performance as of 9/30/2019:
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 18.36%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.21%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.29%)
Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL % RETURNS AS OF 12/31/18
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest 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 After-tax returns are not relevant to investors who hold their 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 Institutional Class shares only and after-tax returns for other classes may vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are shown for Institutional Class shares only and after-tax returns for other classes may vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Focus Fund
Class A Shares (NFAAX), Class C Shares (NFACX), Institutional Class Shares (NFALX) | Neuberger Berman Focus Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.38%)
5 Years rr_AverageAnnualReturnYear05 8.49%
10 Years rr_AverageAnnualReturnYear10 13.12%
Class A Shares (NFAAX), Class C Shares (NFACX), Institutional Class Shares (NFALX) | Neuberger Berman Focus Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum initial sales charge on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum contingent deferred sales charge (as a % of the lower of original purchase price or current market value) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fees rr_ManagementFeesOverAssets 0.79%
Distribution and/or shareholder service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.08%
Total annual operating expenses rr_ExpensesOverAssets 1.12%
Total annual operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.12% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 683
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 911
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,156
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,860
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 683
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 911
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,156
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,860
1 Year rr_AverageAnnualReturnYear01 (14.30%)
5 Years rr_AverageAnnualReturnYear05 3.75%
10 Years rr_AverageAnnualReturnYear10 10.56%
Class A Shares (NFAAX), Class C Shares (NFACX), Institutional Class Shares (NFALX) | Neuberger Berman Focus Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum initial sales charge on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lower of original purchase price or current market value) rr_MaximumDeferredSalesChargeOverOther 1.00% [1]
Management fees rr_ManagementFeesOverAssets 0.79%
Distribution and/or shareholder service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.09%
Total annual operating expenses rr_ExpensesOverAssets 1.88%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.01%
Total annual operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.87% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 290
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 588
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,013
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,198
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 190
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 588
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,013
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,198
1 Year rr_AverageAnnualReturnYear01 (10.61%)
5 Years rr_AverageAnnualReturnYear05 4.21%
10 Years rr_AverageAnnualReturnYear10 10.51%
Class A Shares (NFAAX), Class C Shares (NFACX), Institutional Class Shares (NFALX) | Neuberger Berman Focus Fund | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum initial sales charge on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lower of original purchase price or current market value) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fees rr_ManagementFeesOverAssets 0.68%
Distribution and/or shareholder service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.08%
Total annual operating expenses rr_ExpensesOverAssets 0.76%
Total annual operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.76% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 78
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 243
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 422
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 942
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 78
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 243
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 422
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 942
Annual Return 2009 rr_AnnualReturn2009 29.27%
Annual Return 2010 rr_AnnualReturn2010 12.24%
Annual Return 2011 rr_AnnualReturn2011 (2.66%)
Annual Return 2012 rr_AnnualReturn2012 19.98%
Annual Return 2013 rr_AnnualReturn2013 35.63%
Annual Return 2014 rr_AnnualReturn2014 10.70%
Annual Return 2015 rr_AnnualReturn2015 0.34%
Annual Return 2016 rr_AnnualReturn2016 7.24%
Annual Return 2017 rr_AnnualReturn2017 19.53%
Annual Return 2018 rr_AnnualReturn2018 (8.74%)
1 Year rr_AverageAnnualReturnYear01 (8.74%)
5 Years rr_AverageAnnualReturnYear05 5.38%
10 Years rr_AverageAnnualReturnYear10 11.56%
Class A Shares (NFAAX), Class C Shares (NFACX), Institutional Class Shares (NFALX) | Neuberger Berman Focus Fund | Institutional Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (10.76%)
5 Years rr_AverageAnnualReturnYear05 2.89%
10 Years rr_AverageAnnualReturnYear10 9.91%
Class A Shares (NFAAX), Class C Shares (NFACX), Institutional Class Shares (NFALX) | Neuberger Berman Focus Fund | Institutional Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (4.07%)
5 Years rr_AverageAnnualReturnYear05 3.85%
10 Years rr_AverageAnnualReturnYear10 9.37%
[1] For Class A shares, a contingent deferred sales charge ("CDSC") of 1.00% applies on certain redemptions made within 18 months following purchases of $1 million or more made without an initial sales charge. For Class C shares, the CDSC is eliminated one year after purchase.
[2] Neuberger Berman Investment Advisers LLC ("Manager") has contractually undertaken to waive and/or reimburse certain fees and expenses of Class A, Class C and Institutional Class so that the total annual operating expenses (excluding interest, taxes, brokerage commissions, acquired fund fees and expenses, dividend and interest expenses relating to short sales, and extraordinary expenses, if any) ("annual operating expenses") of each class are limited to 1.11%, 1.86% and 0.75% of average net assets, respectively. Each of these undertakings lasts until 8/31/2023 and may not be terminated during its term without the consent of the Board of Trustees. The Fund has agreed that each of Class A, Class C and Institutional Class will repay the Manager for fees and expenses waived or reimbursed for the class provided that repayment does not cause annual operating expenses to exceed 1.11%, 1.86% and 0.75% of the class' average net assets, respectively. Any such repayment must be made within three years after the year in which the Manager incurred the expense.