Investment Risks - DELAWARE GROUP EQUITY FUNDS IV - A, C, R, and Institutional	Mar. 31, 2026
Nomura Asset Strategy Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Asset Strategy Fund \| Market Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Asset Strategy Fund \| Foreign and Emerging Markets Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Foreign and emerging markets risk — The risk that investments in foreign securities (particularly those of issuers in emerging markets) may be adversely affected by political instability; changes in currency exchange rates; inefficient markets and higher transaction costs; foreign economic conditions; the imposition of economic or trade sanctions; or inadequate or different regulatory and accounting standards. Securities of issuers in emerging markets may be subject to greater risks than securities of issuers in more developed foreign markets because, among other things, emerging markets may have less stable political and economic environments. In addition, there often is substantially less publicly available information about issuers and such information tends to be of a lesser quality. Economic markets and structures tend to be less mature and diverse and the securities markets may also be smaller, less liquid, and subject to greater price volatility.
Nomura Asset Strategy Fund \| Exchange-traded fund risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Exchange-traded fund risk — The risks of investing in an ETF typically reflect the risks of the instruments in which the ETF invests. Because ETFs are investment companies, a fund will bear its proportionate share of the fees and expenses of an investment in an ETF. As a result, a fund’s expenses may be higher and performance may be lower.
Nomura Asset Strategy Fund \| Commodity-related investments risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Commodity-related investments risk — The value of commodities investments will generally be affected by overall market movements and factors specific to a particular industry or commodity, which may include weather, embargoes, tariffs, and economic health, political, international regulatory and other developments. Exposure to the commodities markets may subject a fund to greater volatility than investments in traditional securities.
Nomura Asset Strategy Fund \| Credit risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Credit risk — The risk that an issuer of a debt security, including a governmental issuer or an entity that insures a bond, may be unable to make interest payments and/or repay principal in a timely manner.
Nomura Asset Strategy Fund \| High Yield (Junk) Bond Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	High yield (junk) bond risk — The risk that high yield securities, commonly known as “junk bonds,” are subject to reduced creditworthiness of issuers, increased risk of default, and a more limited and less liquid secondary market. High yield securities may also be subject to greater price volatility and risk of loss of income and principal than are higher-rated securities.
Nomura Asset Strategy Fund \| Loans and Other Direct Indebtedness Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Loans and other direct indebtedness risk — The risk that a fund will not receive payment of principal, interest, and other amounts due in connection with these investments and will depend primarily on the financial condition of the borrower and the lending institution. A fund’s ability to sell its loans or to realize their full value upon sale may also be impaired due to the lack of an active trading market, irregular trading activity, wide bid/ask spreads, contractual restrictions, and extended trade settlement periods. In addition, certain loans in which a fund invests may not be considered securities. A fund therefore may not be able to rely upon the anti-fraud provisions of the federal securities laws with respect to these investments.
Nomura Asset Strategy Fund \| Liquidity Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Asset Strategy Fund \| Interest rate risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Interest rate risk — The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates when interest rates are low or inflation rates are high or rising.
Nomura Asset Strategy Fund \| Mortgage-Backed and Asset-Backed Securities Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Mortgage-backed and asset-backed securities risk — Mortgage-backed and asset-backed securities, like other fixed income securities, are subject to credit risk and interest rate risk, and may also be subject to prepayment risk and extension risk. Prepayment risk is the risk that the principal on mortgage-backed or asset-backed securities may be prepaid at any time, which will reduce the yield and market value of the securities and may cause the fund to reinvest the proceeds in lower yielding securities. Extension risk is the risk that principal on mortgage-backed or asset-backed securities will be repaid more slowly than expected, which may reduce the proceeds available for reinvestment in higher yielding securities. In addition, mortgage-backed and asset-backed securities may decline in value, become more volatile, face difficulties in valuation, or experience reduced liquidity due to changes in interest rates or general economic conditions. Certain mortgage-backed or asset-backed securities, such as collateralized mortgage obligations, real estate mortgage investment conduits, and stripped mortgage-backed securities, may be more susceptible to these risks than other mortgage-backed, asset-backed, or fixed-income securities.
Nomura Asset Strategy Fund \| Industry and sector risk
Prospectus [Line Items]
Risk [Text Block]	Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as information technology) will decline because of changing expectations for the performance of that industry or sector.
Nomura Asset Strategy Fund \| US Government Securities Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	US government securities risk — The risk that certain US government securities, such as securities issued by Fannie Mae, Freddie Mac and the Federal Home Loan Bank system (FHLB), are not backed by the “faith and credit” of the US government and, instead, may be supported only by the credit of the issuer or by the right of the issuer to borrow from the US Treasury.
Nomura Asset Strategy Fund \| Derivatives Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Derivatives risk — Derivatives contracts, such as futures, forward foreign currency contracts, options, and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, index, reference rate, or other asset or market factor to which a derivatives contract is associated, moves in an unanticipated direction. When used for hedging, the change in value of the derivatives instrument may also not correlate specifically with the currency, rate, or other risk being hedged, in which case a fund may not realize the intended benefits. Derivatives contracts are also subject to the risk that the counterparty may fail to perform its obligations under the contract due to, among other reasons, financial difficulties (such as a bankruptcy or reorganization).
Nomura Asset Strategy Fund \| Subsidiary risk
Prospectus [Line Items]
Risk [Text Block]	Subsidiary risk — The Subsidiary is not registered, nor subject to the investor protections, under the 1940 Act, and does not benefit from all the investor protections that apply to 1940 Act-registered funds. Changes in applicable tax laws could result in the inability of the Fund and/or the Subsidiary to operate as described herein, which could adversely affect the Fund and its shareholders.
Nomura Asset Strategy Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Balanced Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Balanced Fund \| Market Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Balanced Fund \| Exchange-traded fund risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Exchange-traded fund risk — The risks of investing in an ETF typically reflect the risks of the instruments in which the ETF invests. Because ETFs are investment companies, a fund will bear its proportionate share of the fees and expenses of an investment in an ETF. As a result, a fund’s expenses may be higher and performance may be lower.
Nomura Balanced Fund \| Credit risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Credit risk — The risk that an issuer of a debt security, including a governmental issuer or an entity that insures a bond, may be unable to make interest payments and/or repay principal in a timely manner.
Nomura Balanced Fund \| High Yield (Junk) Bond Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	High yield (junk) bond risk — The risk that high yield securities, commonly known as “junk bonds,” are subject to reduced creditworthiness of issuers, increased risk of default, and a more limited and less liquid secondary market. High yield securities may also be subject to greater price volatility and risk of loss of income and principal than are higher-rated securities.
Nomura Balanced Fund \| Liquidity Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Balanced Fund \| Interest rate risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Interest rate risk — The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates when interest rates are low or inflation rates are high or rising.
Nomura Balanced Fund \| Mortgage-Backed and Asset-Backed Securities Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Mortgage-backed and asset-backed securities risk — Mortgage-backed and asset-backed securities, like other fixed income securities, are subject to credit risk and interest rate risk, and may also be subject to prepayment risk and extension risk. Prepayment risk is the risk that the principal on mortgage-backed or asset-backed securities may be prepaid at any time, which will reduce the yield and market value of the securities and may cause the fund to reinvest the proceeds in lower yielding securities. Extension risk is the risk that principal on mortgage-backed or asset-backed securities will be repaid more slowly than expected, which may reduce the proceeds available for reinvestment in higher yielding securities. In addition, mortgage-backed and asset-backed securities may decline in value, become more volatile, face difficulties in valuation, or experience reduced liquidity due to changes in interest rates or general economic conditions. Certain mortgage-backed or asset-backed securities, such as collateralized mortgage obligations, real estate mortgage investment conduits, and stripped mortgage-backed securities, may be more susceptible to these risks than other mortgage-backed, asset-backed, or fixed-income securities.
Nomura Balanced Fund \| Industry and sector risk
Prospectus [Line Items]
Risk [Text Block]	Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as information technology) will decline because of changing expectations for the performance of that industry or sector.
Nomura Balanced Fund \| US Government Securities Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	US government securities risk — The risk that certain US government securities, such as securities issued by Fannie Mae, Freddie Mac and the Federal Home Loan Bank system (FHLB), are not backed by the “faith and credit” of the US government and, instead, may be supported only by the credit of the issuer or by the right of the issuer to borrow from the US Treasury.
Nomura Balanced Fund \| Preferred stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Preferred stock risk — The risk that preferred stocks may be subordinated to bonds in terms of rights to their share of the company’s assets, may be less liquid than many other securities, and generally offer no voting rights with respect to the issuer. Preferred stocks may also be adversely affected by interest rates and may be callable by the issuer.
Nomura Balanced Fund \| REIT-related risk [Member]
Prospectus [Line Items]
Risk [Text Block]	REIT-related risk — The risk that the value of a fund’s investments in a REIT may be adversely affected by (1) changes in the value of the REIT’s underlying property or the property secured by mortgages the REIT holds; (2) loss of REIT federal tax status (and the resulting inability to qualify for modified pass-through tax treatment under the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code” or the “Code”)) or changes in laws and/or rules related to that status; or (3) the REIT’s failure to maintain its exemption from registration under the Investment Company Act of 1940 (1940 Act). In addition, a fund may experience a decline in its income from REIT securities due to falling interest rates or decreasing dividend payments.
Nomura Balanced Fund \| Company size risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Company size risk — The risk that investments in small- and/or medium-sized companies may be more volatile than those of larger companies because of limited financial resources or dependence on narrow product lines.
Nomura Balanced Fund \| Foreign Risk
Prospectus [Line Items]
Risk [Text Block]	Foreign risk — The risk that investments in foreign securities (particularly those of issuers in emerging markets) may be adversely affected by political instability, changes in currency exchange rates, inefficient markets and higher transaction costs, foreign economic conditions, the imposition of economic or trade sanctions, or inadequate or different regulatory and accounting standards.
Nomura Balanced Fund \| Active Managment and Selection Risk
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Core Equity Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Core Equity Fund \| Market Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Core Equity Fund \| Liquidity Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Core Equity Fund \| Industry and sector risk
Prospectus [Line Items]
Risk [Text Block]	Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as financials, industrials, or information technology) will decline because of changing expectations for the performance of that industry or sector.
Nomura Core Equity Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Core Equity Fund \| Foreign Risk
Prospectus [Line Items]
Risk [Text Block]	Foreign risk — The risk that investments in foreign securities (particularly those of issuers in emerging markets) may be adversely affected by political instability, changes in currency exchange rates, inefficient markets and higher transaction costs, foreign economic conditions, the imposition of economic or trade sanctions, or inadequate or different regulatory and accounting standards.
Nomura Core Equity Fund \| Large-capitalization company risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Large-capitalization company risk — Large-capitalization companies tend to be less volatile than companies with smaller market capitalizations. This potentially lower risk means that the Fund’s share price may not rise as much as the share prices of funds that focus on smaller-capitalization companies.
Nomura Core Equity Fund \| Growth stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Growth stock risk — Growth stocks reflect projections of future earnings and revenue. These prices may rise or fall dramatically depending on whether those projections are met. These companies’ stock prices may be more volatile, particularly over the short term.
Nomura Core Equity Fund \| Value stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Value stock risk — The risk that the value of a security believed by the Manager to be undervalued may never reach what is believed to be its full value; such security’s value may decrease or such security may be appropriately priced. Value stocks are stocks of companies that may have experienced adverse business or industry developments or may be subject to special risks that have caused the stocks to be out of favor and, in the opinion of the Manager, undervalued.
Nomura Core Equity Fund \| Information technology sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Information technology sector risk — The risk that investment risks associated with investing in the information technology sector, in addition to other risks, include the intense competition to which information technology companies may be subject; the dramatic and often unpredictable changes in growth rates and competition for qualified personnel among information technology companies; effects on profitability from being heavily dependent on patent and intellectual property rights and the loss or impairment of those rights; obsolescence of existing technology; general economic conditions; and government regulation.
Nomura Core Equity Fund \| Limited number of securities risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Limited number of securities risk — The possibility that a single security’s increase or decrease in value may have a greater impact on a fund’s value and total return because the fund may hold larger positions in fewer securities than other funds. In addition, a fund that holds a limited number of securities may be more volatile than those funds that hold a greater number of securities.
Nomura Global Growth Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Global Growth Fund \| Market Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Global Growth Fund \| Foreign and Emerging Markets Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Foreign and emerging markets risk — The risk that investments in foreign securities (particularly those of issuers in emerging markets) may be adversely affected by political instability; changes in currency exchange rates; inefficient markets and higher transaction costs; foreign economic conditions; the imposition of economic or trade sanctions; or inadequate or different regulatory and accounting standards. Securities of issuers in emerging markets may be subject to greater risks than securities of issuers in more developed foreign markets because, among other things, emerging markets may have less stable political and economic environments. In addition, there often is substantially less publicly available information about issuers and such information tends to be of a lesser quality. Economic markets and structures tend to be less mature and diverse and the securities markets may also be smaller, less liquid, and subject to greater price volatility.
Nomura Global Growth Fund \| Liquidity Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Global Growth Fund \| Industry and sector risk
Prospectus [Line Items]
Risk [Text Block]	Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as information technology) will decline because of changing expectations for the performance of that industry or sector.
Nomura Global Growth Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Global Growth Fund \| Large-capitalization company risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Large-capitalization company risk — Large-capitalization companies tend to be less volatile than companies with smaller market capitalizations. This potentially lower risk means that the Fund’s share price may not rise as much as the share prices of funds that focus on smaller-capitalization companies.
Nomura Global Growth Fund \| Growth stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Growth stock risk — Growth stocks reflect projections of future earnings and revenue. These prices may rise or fall dramatically depending on whether those projections are met. These companies’ stock prices may be more volatile, particularly over the short term.
Nomura Global Growth Fund \| Information technology sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Information technology sector risk — The risk that investment risks associated with investing in the information technology sector, in addition to other risks, include the intense competition to which information technology companies may be subject; the dramatic and often unpredictable changes in growth rates and competition for qualified personnel among information technology companies; effects on profitability from being heavily dependent on patent and intellectual property rights and the loss or impairment of those rights; obsolescence of existing technology; general economic conditions; and government regulation.
Nomura Global Growth Fund \| Limited number of securities risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Limited number of securities risk — The possibility that a single security’s increase or decrease in value may have a greater impact on a fund’s value and total return because the fund may hold larger positions in fewer securities than other funds. In addition, a fund that holds a limited number of securities may be more volatile than those funds that hold a greater number of securities.
Nomura Global Growth Fund \| Currency risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Currency risk — The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.
Nomura International Core Equity Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura International Core Equity Fund \| Market Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura International Core Equity Fund \| Foreign and Emerging Markets Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Foreign and emerging markets risk — The risk that investments in foreign securities (particularly those of issuers in emerging markets) may be adversely affected by political instability; changes in currency exchange rates; inefficient markets and higher transaction costs; foreign economic conditions; the imposition of economic or trade sanctions; or inadequate or different regulatory and accounting standards. Securities of issuers in emerging markets may be subject to greater risks than securities of issuers in more developed foreign markets because, among other things, emerging markets may have less stable political and economic environments. In addition, there often is substantially less publicly available information about issuers and such information tends to be of a lesser quality. Economic markets and structures tend to be less mature and diverse and the securities markets may also be smaller, less liquid, and subject to greater price volatility.
Nomura International Core Equity Fund \| Liquidity Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura International Core Equity Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura International Core Equity Fund \| Large-capitalization company risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Large-capitalization company risk — Large-capitalization companies tend to be less volatile than companies with smaller market capitalizations. This potentially lower risk means that the Fund’s share price may not rise as much as the share prices of funds that focus on smaller-capitalization companies.
Nomura International Core Equity Fund \| Growth stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Growth stock risk — Growth stocks reflect projections of future earnings and revenue. These prices may rise or fall dramatically depending on whether those projections are met. These companies’ stock prices may be more volatile, particularly over the short term.
Nomura International Core Equity Fund \| Value stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Value stock risk — The risk that the value of a security believed by the Manager to be undervalued may never reach what is believed to be its full value; such security’s value may decrease or such security may be appropriately priced. Value stocks are stocks of companies that may have experienced adverse business or industry developments or may be subject to special risks that have caused the stocks to be out of favor and, in the opinion of the Manager, undervalued.
Nomura International Core Equity Fund \| Limited number of securities risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Limited number of securities risk — The possibility that a single security’s increase or decrease in value may have a greater impact on a fund’s value and total return because the fund may hold larger positions in fewer securities than other funds. In addition, a fund that holds a limited number of securities may be more volatile than those funds that hold a greater number of securities.
Nomura International Core Equity Fund \| Currency risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Currency risk — The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.
Nomura International Core Equity Fund \| Geographic Focus Risk
Prospectus [Line Items]
Risk [Text Block]	Geographic focus risk — The risk that local political and economic conditions could adversely affect the performance of a fund investing a substantial amount of assets in securities of issuers located in a single country or a limited number of countries. At times, the Fund may invest significantly in the Asia-Pacific region. Adverse events in any one country within the Asia-Pacific region may impact the other countries in the region or Asia as a whole. As a result, adverse events in the region will generally have a greater effect on the Fund when it is invested significantly in the Asia-Pacific region than if the Fund were more geographically diversified, which could result in greater volatility in the Fund’s net asset value and losses.
Nomura Large Cap Growth Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Large Cap Growth Fund \| Risk Nondiversified Status [Member]
Prospectus [Line Items]
Risk [Text Block]	Nondiversification risk — A nondiversified fund has the flexibility to invest as much as 50% of its assets in as few as two issuers with no single issuer accounting for more than 25% of the fund. The remaining 50% of its assets must be diversified so that no more than 5% of its assets are invested in the securities of a single issuer. Because a nondiversified fund may invest its assets in fewer issuers, the value of its shares may increase or decrease more rapidly than if it were fully diversified.
Nomura Large Cap Growth Fund \| Market Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Large Cap Growth Fund \| Liquidity Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Large Cap Growth Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Large Cap Growth Fund \| Large-capitalization company risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Large-capitalization company risk — Large-capitalization companies tend to be less volatile than companies with smaller market capitalizations. This potentially lower risk means that the Fund’s share price may not rise as much as the share prices of funds that focus on smaller-capitalization companies.
Nomura Large Cap Growth Fund \| Growth stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Growth stock risk — Growth stocks reflect projections of future earnings and revenue. These prices may rise or fall dramatically depending on whether those projections are met. These companies’ stock prices may be more volatile, particularly over the short term.
Nomura Large Cap Growth Fund \| Information technology sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Information technology sector risk — The risk that investment risks associated with investing in the information technology sector, in addition to other risks, include the intense competition to which information technology companies may be subject; the dramatic and often unpredictable changes in growth rates and competition for qualified personnel among information technology companies; effects on profitability from being heavily dependent on patent and intellectual property rights and the loss or impairment of those rights; obsolescence of existing technology; general economic conditions; and government regulation.
Nomura Large Cap Growth Fund \| Limited number of securities risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Limited number of securities risk — The possibility that a single security’s increase or decrease in value may have a greater impact on a fund’s value and total return because the fund may hold larger positions in fewer securities than other funds. In addition, a fund that holds a limited number of securities may be more volatile than those funds that hold a greater number of securities.
Nomura Large Cap Growth Fund \| Industry and security risks [Member]
Prospectus [Line Items]
Risk [Text Block]	Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as financials or information technology) will decline because of changing expectations for the performance of that industry or sector.
Nomura Large Cap Growth Fund \| Government and regulatory risks [Member]
Prospectus [Line Items]
Risk [Text Block]	Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance.
Nomura Mid Cap Growth Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Mid Cap Growth Fund \| Industry and sector risk
Prospectus [Line Items]
Risk [Text Block]	Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as industrials, information technology or healthcare) will decline because of changing expectations for the performance of that industry or sector.
Nomura Mid Cap Growth Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Mid Cap Growth Fund \| Company size risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Company size risk — The risk that investments in small- and/or medium-sized companies may be more volatile than those of larger companies because of limited financial resources or dependence on narrow product lines.
Nomura Mid Cap Growth Fund \| Growth stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Growth stock risk — Growth stocks reflect projections of future earnings and revenue. These prices may rise or fall dramatically depending on whether those projections are met. These companies’ stock prices may be more volatile, particularly over the short term.
Nomura Mid Cap Growth Fund \| Information technology sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Information technology sector risk — The risk that investment risks associated with investing in the information technology sector, in addition to other risks, include the intense competition to which information technology companies may be subject; the dramatic and often unpredictable changes in growth rates and competition for qualified personnel among information technology companies; effects on profitability from being heavily dependent on patent and intellectual property rights and the loss or impairment of those rights; obsolescence of existing technology; general economic conditions; and government regulation.
Nomura Mid Cap Growth Fund \| Market risk_
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Mid Cap Growth Fund \| Industrials sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Industrials sector risk — The risk that the value of a fund’s shares will be affected by factors particular to the industrials and related sectors (such as government regulation) and may fluctuate more widely than that of a fund that invests in a broad range of sectors.
Nomura Mid Cap Growth Fund \| Healthcare sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Healthcare sector risk — The risk that the value of a fund’s shares will be affected by factors particular to the healthcare and related sectors (such as government regulation) and may fluctuate more widely than that of a fund that invests in a broad range of sectors.
Nomura Mid Cap Growth Fund \| Liquidity risk_[Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Mid Cap Income Opportunities Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Mid Cap Income Opportunities Fund \| Industry and sector risk
Prospectus [Line Items]
Risk [Text Block]	Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as consumer discretionary or industrials) will decline because of changing expectations for the performance of that industry or sector.
Nomura Mid Cap Income Opportunities Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Mid Cap Income Opportunities Fund \| Company size risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Company size risk — The risk that investments in small- and/or medium-sized companies may be more volatile than those of larger companies because of limited financial resources or dependence on narrow product lines.
Nomura Mid Cap Income Opportunities Fund \| Limited number of securities risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Limited number of securities risk — The possibility that a single security’s increase or decrease in value may have a greater impact on a fund’s value and total return because the fund may hold larger positions in fewer securities than other funds. In addition, a fund that holds a limited number of securities may be more volatile than those funds that hold a greater number of securities.
Nomura Mid Cap Income Opportunities Fund \| Market risk_
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Mid Cap Income Opportunities Fund \| Industrials sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Industrials sector risk — The risk that the value of a fund’s shares will be affected by factors particular to the industrials and related sectors (such as government regulation) and may fluctuate more widely than that of a fund that invests in a broad range of sectors.
Nomura Mid Cap Income Opportunities Fund \| Liquidity risk_[Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Mid Cap Income Opportunities Fund \| Divident paying stock risk
Prospectus [Line Items]
Risk [Text Block]	Dividend paying stock risk — Dividend paying stocks may fall out of favor with investors and underperform non-dividend paying stocks and the market as a whole over any period of time. In addition, there is no guarantee that the companies in which a Fund invests will declare dividends in the future or that dividends, if declared, will remain at current levels or increase over time. The amount of any dividend a company may pay may fluctuate significantly.
Nomura Smid Cap Core Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Smid Cap Core Fund \| Liquidity Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Smid Cap Core Fund \| Interest rate risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Interest rate risk — The risk that securities will decrease in value if interest rates rise. The risk is generally associated with bonds; however, because small- and medium-sized companies and companies in the real estate sector often borrow money to finance their operations, they may be adversely affected by rising interest rates. A fund may be subject to a greater risk of rising interest rates when interest rates are low or inflation rates are high or rising.
Nomura Smid Cap Core Fund \| Industry and sector risk
Prospectus [Line Items]
Risk [Text Block]	Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as industrials) will decline because of changing expectations for the performance of that industry or sector.
Nomura Smid Cap Core Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Smid Cap Core Fund \| Company size risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Company size risk — The risk that investments in small- and/or medium-sized companies may be more volatile than those of larger companies because of limited financial resources or dependence on narrow product lines.
Nomura Smid Cap Core Fund \| Government and regulatory risks [Member]
Prospectus [Line Items]
Risk [Text Block]	Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance.
Nomura Smid Cap Core Fund \| Market risk_
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Smid Cap Core Fund \| Industrials sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Industrials sector risk — The risk that the value of a fund’s shares will be affected by factors particular to the industrials and related sectors (such as government regulation) and may fluctuate more widely than that of a fund that invests in a broad range of sectors.
Nomura Small Cap Growth Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Small Cap Growth Fund \| Industry and sector risk
Prospectus [Line Items]
Risk [Text Block]	Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as information technology, industrials, or healthcare) will decline because of changing expectations for the performance of that industry or sector.
Nomura Small Cap Growth Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Small Cap Growth Fund \| Company size risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Company size risk — The risk that investments in small- and/or medium-sized companies may be more volatile than those of larger companies because of limited financial resources or dependence on narrow product lines.
Nomura Small Cap Growth Fund \| Growth stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Growth stock risk — Growth stocks reflect projections of future earnings and revenue. These prices may rise or fall dramatically depending on whether those projections are met. These companies’ stock prices may be more volatile, particularly over the short term.
Nomura Small Cap Growth Fund \| Information technology sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Information technology sector risk — The risk that investment risks associated with investing in the information technology sector, in addition to other risks, include the intense competition to which information technology companies may be subject; the dramatic and often unpredictable changes in growth rates and competition for qualified personnel among information technology companies; effects on profitability from being heavily dependent on patent and intellectual property rights and the loss or impairment of those rights; obsolescence of existing technology; general economic conditions; and government regulation.
Nomura Small Cap Growth Fund \| Market risk_
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Small Cap Growth Fund \| Industrials sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Industrials sector risk — The risk that the value of a fund’s shares will be affected by factors particular to the industrials and related sectors (such as government regulation) and may fluctuate more widely than that of a fund that invests in a broad range of sectors.
Nomura Small Cap Growth Fund \| Healthcare sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Healthcare sector risk — The risk that the value of a fund’s shares will be affected by factors particular to the healthcare and related sectors (such as government regulation) and may fluctuate more widely than that of a fund that invests in a broad range of sectors.
Nomura Small Cap Growth Fund \| Liquidity risk_[Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Small Cap Growth Fund \| Initial public offering (IPO) risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Initial public offering (IPO) risk — The risk that any positive effect of investments in IPOs may not be sustainable because of a number of factors. Namely, a fund may not be able to buy shares in some IPOs, or may be able to buy only a small number of shares. Also, the performance of IPOs generally is volatile, and is dependent on market psychology and economic conditions. To the extent that IPOs have a significant positive impact on a fund’s performance, this may not be able to be replicated in the future. The relative performance impact of IPOs also is likely to decline as a fund grows.
Nomura Systematic Emerging Markets Equity Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Systematic Emerging Markets Equity Fund \| Foreign and Emerging Markets Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Foreign and emerging markets risk — The risk that investments in foreign securities (particularly those of issuers in emerging markets) may be adversely affected by political instability; changes in currency exchange rates; inefficient markets and higher transaction costs; foreign economic conditions; the imposition of economic or trade sanctions; or inadequate or different regulatory and accounting standards. Securities of issuers in emerging markets may be subject to greater risks than securities of issuers in more developed foreign markets because, among other things, emerging markets may have less stable political and economic environments. In addition, there often is substantially less publicly available information about issuers and such information tends to be of a lesser quality. Economic markets and structures tend to be less mature and diverse and the securities markets may also be smaller, less liquid, and subject to greater price volatility.
Nomura Systematic Emerging Markets Equity Fund \| Industry and sector risk
Prospectus [Line Items]
Risk [Text Block]	Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as financials or information technology) will decline because of changing expectations for the performance of that industry or sector.
Nomura Systematic Emerging Markets Equity Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Systematic Emerging Markets Equity Fund \| Company size risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Company size risk — The risk that investments in small- and/or medium-sized companies may be more volatile than those of larger companies because of limited financial resources or dependence on narrow product lines.
Nomura Systematic Emerging Markets Equity Fund \| Large-capitalization company risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Large-capitalization company risk — Large-capitalization companies tend to be less volatile than companies with smaller market capitalizations. This potentially lower risk means that the Fund’s share price may not rise as much as the share prices of funds that focus on smaller-capitalization companies.
Nomura Systematic Emerging Markets Equity Fund \| Growth stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Growth stock risk — Growth stocks reflect projections of future earnings and revenue. These prices may rise or fall dramatically depending on whether those projections are met. These companies’ stock prices may be more volatile, particularly over the short term.
Nomura Systematic Emerging Markets Equity Fund \| Information technology sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Information technology sector risk — The risk that investment risks associated with investing in the information technology sector, in addition to other risks, include the intense competition to which information technology companies may be subject; the dramatic and often unpredictable changes in growth rates and competition for qualified personnel among information technology companies; effects on profitability from being heavily dependent on patent and intellectual property rights and the loss or impairment of those rights; obsolescence of existing technology; general economic conditions; and government regulation.
Nomura Systematic Emerging Markets Equity Fund \| Geographic Focus Risk
Prospectus [Line Items]
Risk [Text Block]	Geographic focus risk — The risk that local political and economic conditions could adversely affect the performance of a fund investing a substantial amount of assets in securities of issuers located in a single country or a limited number of countries. Adverse events in any one country within the Asia-Pacific region may impact the other countries in the region or Asia as a whole. As a result, adverse events in the region will generally have a greater effect on a fund than if the fund were more geographically diversified, which could result in greater volatility in the fund’s net asset value and losses.
Nomura Systematic Emerging Markets Equity Fund \| Market risk_
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Systematic Emerging Markets Equity Fund \| Liquidity risk_[Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Systematic Emerging Markets Equity Fund \| Capital repatriation risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Capital repatriation risk — The risk that a fund may be unable to repatriate capital from its investments, in whole or in part, which may have an adverse effect on the cash flows and/or performance of the fund. Capital repatriation involves the transfer of corporate money or property from a foreign country back to its home country. The repatriation of capital with regard to investments made in certain securities or countries may be restricted during certain times from the date of such investments or even indefinitely.
Nomura Systematic Emerging Markets Equity Fund \| Currency Risk
Prospectus [Line Items]
Risk [Text Block]	Currency risk — The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.
Nomura Systematic Emerging Markets Equity Fund \| China investment risk [Member]
Prospectus [Line Items]
Risk [Text Block]	China investment risk — The risk that the markets in the greater China region can experience significant volatility due to social, economic, regulatory, and political uncertainties.
Nomura Climate Solutions Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Climate Solutions Fund \| Risk Nondiversified Status [Member]
Prospectus [Line Items]
Risk [Text Block]	Nondiversification risk — A nondiversified fund has the flexibility to invest as much as 50% of its assets in as few as two issuers with no single issuer accounting for more than 25% of the fund. The remaining 50% of its assets must be diversified so that no more than 5% of its assets are invested in the securities of a single issuer. Because a nondiversified fund may invest its assets in fewer issuers, the value of its shares may increase or decrease more rapidly than if it were fully diversified.
Nomura Climate Solutions Fund \| Foreign and Emerging Markets Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Foreign and emerging markets risk — The risk that investments in foreign securities (particularly those of issuers in emerging markets) may be adversely affected by political instability; changes in currency exchange rates; inefficient markets and higher transaction costs; foreign economic conditions; the imposition of economic or trade sanctions; or inadequate or different regulatory and accounting standards. Securities of issuers in emerging markets may be subject to greater risks than securities of issuers in more developed foreign markets because, among other things, emerging markets may have less stable political and economic environments. In addition, there often is substantially less publicly available information about issuers and such information tends to be of a lesser quality. Economic markets and structures tend to be less mature and diverse and the securities markets may also be smaller, less liquid, and subject to greater price volatility.
Nomura Climate Solutions Fund \| Industry and sector risk
Prospectus [Line Items]
Risk [Text Block]	Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as utilities) will decline because of changing expectations for the performance of that industry or sector.
Nomura Climate Solutions Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Climate Solutions Fund \| Currency risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Currency risk — The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.
Nomura Climate Solutions Fund \| Market risk_
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Climate Solutions Fund \| Liquidity risk_[Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Climate Solutions Fund \| Initial public offering (IPO) risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Initial public offering (IPO) risk — The risk that any positive effect of investments in IPOs may not be sustainable because of a number of factors. Namely, a fund may not be able to buy shares in some IPOs, or may be able to buy only a small number of shares. Also, the performance of IPOs generally is volatile, and is dependent on market psychology and economic conditions. To the extent that IPOs have a significant positive impact on a fund’s performance, this may not be able to be replicated in the future. The relative performance impact of IPOs also is likely to decline as a fund grows.
Nomura Climate Solutions Fund \| Climate change investment focus risk
Prospectus [Line Items]
Risk [Text Block]	Climate change investment focus risk — The Fund’s focus on securities of issuers that seek to reduce, displace and/or sequestor GHG emissions or help other to do so may affect the Fund’s exposure to certain sectors or types of investments. The Fund’s relative investment performance may also be impacted depending on whether such sectors or investments are in or out of favor with the market. Certain investments may be dependent on U.S. and foreign government policies, including tax incentives and subsidies, as well as on political support for certain environmental initiatives and developments affecting companies focused on sustainable energy and climate change solutions generally.
Nomura Climate Solutions Fund \| ESG screening risk
Prospectus [Line Items]
Risk [Text Block]	ESG screening risk — Using ESG criteria in the investment process may exclude certain companies for non-investment reasons and, therefore, the Fund may forgo some market opportunities available to funds that do not use ESG factors. In addition, because company GHG emissions data are not standardized (and are further subject to estimation error when not company-reported), the data sets the Fund must rely on may imperfectly represent companies’ true GHG emissions. Also, the company emissions targets that the Management Team sets are based on model assumptions and estimations that carry the inherent risk associated with any modeling or estimating process.
Nomura Climate Solutions Fund \| Concentration risk
Prospectus [Line Items]
Risk [Text Block]	Concentration risk — The risk that a concentration in a particular industry will cause a fund to be more exposed to developments affecting that single industry or industry group than a more broadly diversified fund would be. A fund could experience greater volatility or may perform poorly during a downturn in the industry or industry group because it is more susceptible to the economic, regulatory, political, legal and other risks associated with those industries than a fund that invests more broadly.
Nomura Climate Solutions Fund \| Foreign currency exchange transactions and forward foreign currency contracts risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Foreign currency exchange transactions and forward foreign currency contracts risk — The risk that a fund’s use of foreign currency exchange transactions and forward foreign currency contracts to hedge certain market risks (such as interest rates, currency exchange rates and broad or specific market movement) may increase the possibility of default by the counterparty to the transaction and, to the extent the Manager’s judgment as to certain market movements is incorrect, the risk of losses that are greater than if the investment technique had not been used.
Nomura Climate Solutions Fund \| Government and Regulatory Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance.
Nomura Natural Resources Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Natural Resources Fund \| Market Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Natural Resources Fund \| Foreign and Emerging Markets Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Foreign and emerging markets risk — The risk that investments in foreign securities (particularly those of issuers in emerging markets) may be adversely affected by political instability; changes in currency exchange rates; inefficient markets and higher transaction costs; foreign economic conditions; the imposition of economic or trade sanctions; or inadequate or different regulatory and accounting standards. Securities of issuers in emerging markets may be subject to greater risks than securities of issuers in more developed foreign markets because, among other things, emerging markets may have less stable political and economic environments. In addition, there often is substantially less publicly available information about issuers and such information tends to be of a lesser quality. Economic markets and structures tend to be less mature and diverse and the securities markets may also be smaller, less liquid, and subject to greater price volatility.
Nomura Natural Resources Fund \| Commodity-related investments risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Commodity-related investments risk — The value of commodities investments will generally be affected by overall market movements and factors specific to a particular industry or commodity, which may include weather, embargoes, tariffs, and economic health, political, international regulatory and other developments. Exposure to the commodities markets may subject a fund to greater volatility than investments in traditional securities. The investment team does not plan to always implement exposure to commodities in the Fund, however they will consider holding commodity exchange traded funds in market scenarios where inflation is running higher than normal and their asset allocation model signals for additional commodity exposure. In addition, the Fund may use futures and options on commodities for a variety of purposes such as hedging against adverse changes in the market prices of securities, as a substitute for purchasing or selling securities, to increase the Fund’s return as a non-hedging strategy that may be considered speculative and to manage the Fund’s portfolio characteristics.
Nomura Natural Resources Fund \| Liquidity Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Natural Resources Fund \| Industry and sector risk
Prospectus [Line Items]
Risk [Text Block]	Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as natural resources) will decline because of changing expectations for the performance of that industry or sector.
Nomura Natural Resources Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Natural Resources Fund \| Growth stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Growth stock risk — Growth stocks reflect projections of future earnings and revenue. These prices may rise or fall dramatically depending on whether those projections are met. These companies’ stock prices may be more volatile, particularly over the short term.
Nomura Natural Resources Fund \| Value stock risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Value stock risk — The risk that the value of a security believed by the management team to be undervalued may never reach what is believed to be its full value; such security’s value may decrease or such security may be appropriately priced. Value stocks are stocks of companies that may have experienced adverse business or industry developments or may be subject to special risks that have caused the stocks to be out of favor and, in the opinion of the management team, undervalued.
Nomura Natural Resources Fund \| Limited number of securities risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Limited number of securities risk — The possibility that a single security’s increase or decrease in value may have a greater impact on a fund’s value and total return because the fund may hold larger positions in fewer securities than other funds. In addition, a fund that holds a limited number of securities may be more volatile than those funds that hold a greater number of securities.
Nomura Natural Resources Fund \| Currency risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Currency risk — The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.
Nomura Natural Resources Fund \| Concentration risk
Prospectus [Line Items]
Risk [Text Block]	Concentration risk — The risk that a concentration in a particular industry will cause a fund to be more exposed to developments affecting that single industry or industry group than a more broadly diversified fund would be. A fund could experience greater volatility or may perform poorly during a downturn in the industry or industry group because it is more susceptible to the economic, regulatory, political, legal and other risks associated with those industries than a fund that invests more broadly.
Nomura Natural Resources Fund \| Foreign currency exchange transactions and forward foreign currency contracts risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Foreign currency exchange transactions and forward foreign currency contracts risk — The risk that a fund’s use of foreign currency exchange transactions and forward foreign currency contracts to hedge certain market risks (such as interest rates, currency exchange rates and broad or specific market movement) may increase the possibility of default by the counterparty to the transaction and, to the extent the management team’s judgment as to certain market movements is incorrect, the risk of losses that are greater than if the investment technique had not been used.
Nomura Natural Resources Fund \| Natural resources industry risk
Prospectus [Line Items]
Risk [Text Block]	Natural resources industry risk — Investment risks associated with investing in securities of natural resources companies, in addition to other risks, include price fluctuation caused by real and perceived inflationary trends and political developments, the cost assumed by natural resource companies in complying with environmental and safety regulations, changes in supply of, or demand for, various natural resources, changes in energy prices, environmental incidents, energy conservation, the success of exploration projects, changes in commodity prices, and special risks associated with natural or man-made disasters. Securities of natural resource companies that are dependent on a single commodity, or are concentrated in a single commodity sector, may exhibit high volatility attributable to commodity prices.
Nomura Natural Resources Fund \| Energy sector risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Energy sector risk — The risk that investment risks associated with investing in energy securities, in addition to other risks, include price fluctuation caused by real and perceived inflationary trends and political developments, the cost assumed in complying with environmental safety regulations, demand of energy fuels, energy conservation, the success of exploration projects, and tax and other governmental regulations.
Nomura Real Estate Securities Fund \| Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.
Nomura Real Estate Securities Fund \| Market Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.
Nomura Real Estate Securities Fund \| Liquidity Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.
Nomura Real Estate Securities Fund \| Interest rate risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Interest rate risk — The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates when interest rates are low or inflation rates are high or rising.
Nomura Real Estate Securities Fund \| Active management and selection risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.
Nomura Real Estate Securities Fund \| REIT-related risk [Member]
Prospectus [Line Items]
Risk [Text Block]	REIT-related risk — The risk that the value of a fund’s investments in a REIT may be adversely affected by (1) changes in the value of the REIT’s underlying property or the property secured by mortgages the REIT holds; (2) loss of REIT federal tax status (and the resulting inability to qualify for modified pass-through tax treatment under the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code” or the “Code”)) or changes in laws and/or rules related to that status; or (3) the REIT’s failure to maintain its exemption from registration under the Investment Company Act of 1940 (1940 Act). In addition, a fund may experience a decline in its income from REIT securities due to falling interest rates or decreasing dividend payments.
Nomura Real Estate Securities Fund \| Limited number of securities risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Limited number of securities risk — The possibility that a single security’s increase or decrease in value may have a greater impact on a fund’s value and total return because the fund may hold larger positions in fewer securities than other funds. In addition, a fund that holds a limited number of securities may be more volatile than those funds that hold a greater number of securities.
Nomura Real Estate Securities Fund \| Concentration risk
Prospectus [Line Items]
Risk [Text Block]	Concentration risk — The risk that a concentration in a particular industry will cause a fund to be more exposed to developments affecting that single industry or industry group than a more broadly diversified fund would be. A fund could experience greater volatility or may perform poorly during a downturn in the industry or industry group because it is more susceptible to the economic, regulatory, political, legal and other risks associated with those industries than a fund that invests more broadly.
Nomura Real Estate Securities Fund \| Real estate industry risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Real estate industry risk — This risk includes, among others: possible declines in the value of real estate; risks related to general and local economic conditions; possible lack of availability of mortgage funds; overbuilding; extended vacancies of properties; increases in competition, property taxes, and operating expenses; changes in zoning laws; costs resulting from the cleanup of, and liability to third parties resulting from, environmental problems; casualty for condemnation losses; uninsured damages from floods, earthquakes, or other natural disasters; limitations on and variations in rents; and changes in interest rates.
Nomura Real Estate Securities Fund \| Real assets industries risk [Member]
Prospectus [Line Items]

Investment Risks - DELAWARE GROUP EQUITY FUNDS IV - A, C, R, and Institutional

Mar. 31, 2026

Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund’s portfolio. An investment in the Fund may not be appropriate for all investors.

Nomura Asset Strategy Fund | Market Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Market risk — The risk that all or a majority of the securities in a certain market — such as the stock or bond market — will decline in value because of factors such as adverse political or economic conditions, future expectations, investor confidence, or heavy institutional selling.

Nomura Asset Strategy Fund | Foreign and Emerging Markets Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Foreign and emerging markets risk — The risk that investments in foreign securities (particularly those of issuers in emerging markets) may be adversely affected by political instability; changes in currency exchange rates; inefficient markets and higher transaction costs; foreign economic conditions; the imposition of economic or trade sanctions; or inadequate or different regulatory and accounting standards. Securities of issuers in emerging markets may be subject to greater risks than securities of issuers in more developed foreign markets because, among other things, emerging markets may have less stable political and economic environments. In addition, there often is substantially less publicly available information about issuers and such information tends to be of a lesser quality. Economic markets and structures tend to be less mature and diverse and the securities markets may also be smaller, less liquid, and subject to greater price volatility.

Nomura Asset Strategy Fund | Exchange-traded fund risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Exchange-traded fund risk — The risks of investing in an ETF typically reflect the risks of the instruments in which the ETF invests. Because ETFs are investment companies, a fund will bear its proportionate share of the fees and expenses of an investment in an ETF. As a result, a fund’s expenses may be higher and performance may be lower.

Nomura Asset Strategy Fund | Commodity-related investments risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Asset Strategy Fund | Credit risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Credit risk — The risk that an issuer of a debt security, including a governmental issuer or an entity that insures a bond, may be unable to make interest payments and/or repay principal in a timely manner.

Nomura Asset Strategy Fund | High Yield (Junk) Bond Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

High yield (junk) bond risk — The risk that high yield securities, commonly known as “junk bonds,” are subject to reduced creditworthiness of issuers, increased risk of default, and a more limited and less liquid secondary market. High yield securities may also be subject to greater price volatility and risk of loss of income and principal than are higher-rated securities.

Nomura Asset Strategy Fund | Loans and Other Direct Indebtedness Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

bid/ask spreads, contractual restrictions, and extended trade settlement periods. In addition, certain loans in which a fund invests may not be considered securities. A fund therefore may not be able to rely upon the anti-fraud provisions of the federal securities laws with respect to these investments.

Nomura Asset Strategy Fund | Liquidity Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Asset Strategy Fund | Interest rate risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Interest rate risk — The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates when interest rates are low or inflation rates are high or rising.

Nomura Asset Strategy Fund | Mortgage-Backed and Asset-Backed Securities Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Mortgage-backed and asset-backed securities risk — Mortgage-backed and asset-backed securities, like other fixed income securities, are subject to credit risk and interest rate risk, and may also be subject to prepayment risk and extension risk. Prepayment risk is the risk that the principal on mortgage-backed or asset-backed securities may be prepaid at any time, which will reduce the yield and market value of the securities and may cause the fund to reinvest the proceeds in lower yielding securities. Extension risk is the risk that principal on mortgage-backed or asset-backed securities will be repaid more slowly than expected, which may reduce the proceeds available for reinvestment in higher yielding securities. In addition, mortgage-backed and asset-backed securities may decline in value, become more volatile, face difficulties in valuation, or experience reduced liquidity due to changes in interest rates or general economic conditions. Certain mortgage-backed or asset-backed securities, such as collateralized mortgage obligations, real estate mortgage investment conduits, and stripped mortgage-backed securities, may be more susceptible to these risks than other mortgage-backed, asset-backed, or fixed-income securities.

Nomura Asset Strategy Fund | Industry and sector risk

Prospectus [Line Items]

Risk [Text Block]

Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as information technology) will decline because of changing expectations for the performance of that industry or sector.

Nomura Asset Strategy Fund | US Government Securities Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

US government securities risk — The risk that certain US government securities, such as securities issued by Fannie Mae, Freddie Mac and the Federal Home Loan Bank system (FHLB), are not backed by the “faith and credit” of the US government and, instead, may be supported only by the credit of the issuer or by the right of the issuer to borrow from the US Treasury.

Nomura Asset Strategy Fund | Derivatives Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Derivatives risk — Derivatives contracts, such as futures, forward foreign currency contracts, options, and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, index, reference rate, or other asset or market factor to which a derivatives contract is associated, moves in an unanticipated direction. When used for hedging, the change in value of the derivatives instrument may also not correlate specifically with the currency, rate, or other risk being hedged, in which case a fund may not realize the intended benefits. Derivatives contracts are also subject to the risk that the counterparty may fail to perform its obligations under the contract due to, among other reasons, financial difficulties (such as a bankruptcy or reorganization).

Nomura Asset Strategy Fund | Subsidiary risk

Prospectus [Line Items]

Risk [Text Block]

Subsidiary risk — The Subsidiary is not registered, nor subject to the investor protections, under the 1940 Act, and does not benefit from all the investor protections that apply to 1940 Act-registered funds. Changes in applicable tax laws could result in the inability of the Fund and/or the Subsidiary to operate as described herein, which could adversely affect the Fund and its shareholders.

Nomura Asset Strategy Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Active management and selection risk — The risk that the securities selected by a fund’s management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.

Nomura Balanced Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Balanced Fund | Market Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Balanced Fund | Exchange-traded fund risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Balanced Fund | Credit risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Balanced Fund | High Yield (Junk) Bond Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Balanced Fund | Liquidity Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Balanced Fund | Interest rate risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Balanced Fund | Mortgage-Backed and Asset-Backed Securities Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Balanced Fund | Industry and sector risk

Prospectus [Line Items]

Risk [Text Block]

Nomura Balanced Fund | US Government Securities Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Balanced Fund | Preferred stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Preferred stock risk — The risk that preferred stocks may be subordinated to bonds in terms of rights to their share of the company’s assets, may be less liquid than many other securities, and generally offer no voting rights with respect to the issuer. Preferred stocks may also be adversely affected by interest rates and may be callable by the issuer.

Nomura Balanced Fund | REIT-related risk [Member]

Prospectus [Line Items]

Risk [Text Block]

REIT-related risk — The risk that the value of a fund’s investments in a REIT may be adversely affected by (1) changes in the value of the REIT’s underlying property or the property secured by mortgages the REIT holds; (2) loss of REIT federal tax status (and the resulting inability to qualify for modified pass-through tax treatment under the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code” or the “Code”)) or changes in laws and/or rules related to that status; or (3) the REIT’s failure to maintain its exemption from registration under the Investment Company Act of 1940 (1940 Act). In addition, a fund may experience a decline in its income from REIT securities due to falling interest rates or decreasing dividend payments.

Nomura Balanced Fund | Company size risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Company size risk — The risk that investments in small- and/or medium-sized companies may be more volatile than those of larger companies because of limited financial resources or dependence on narrow product lines.

Nomura Balanced Fund | Foreign Risk

Prospectus [Line Items]

Risk [Text Block]

Foreign risk — The risk that investments in foreign securities (particularly those of issuers in emerging markets) may be adversely affected by political instability, changes in currency exchange rates, inefficient markets and higher transaction costs, foreign economic conditions, the imposition of economic or trade sanctions, or inadequate or different regulatory and accounting standards.

Nomura Balanced Fund | Active Managment and Selection Risk

Prospectus [Line Items]

Risk [Text Block]

Nomura Core Equity Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Core Equity Fund | Market Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Core Equity Fund | Liquidity Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Core Equity Fund | Industry and sector risk

Prospectus [Line Items]

Risk [Text Block]

Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as financials, industrials, or information technology) will decline because of changing expectations for the performance of that industry or sector.

Nomura Core Equity Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Core Equity Fund | Foreign Risk

Prospectus [Line Items]

Risk [Text Block]

Nomura Core Equity Fund | Large-capitalization company risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Large-capitalization company risk — Large-capitalization companies tend to be less volatile than companies with smaller market capitalizations. This potentially lower risk means that the Fund’s share price may not rise as much as the share prices of funds that focus on smaller-capitalization companies.

Nomura Core Equity Fund | Growth stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Growth stock risk — Growth stocks reflect projections of future earnings and revenue. These prices may rise or fall dramatically depending on whether those projections are met. These companies’ stock prices may be more volatile, particularly over the short term.

Nomura Core Equity Fund | Value stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Value stock risk — The risk that the value of a security believed by the Manager to be undervalued may never reach what is believed to be its full value; such security’s value may decrease or such security may be appropriately priced. Value stocks are stocks of companies that may have experienced adverse business or industry developments or may be subject to special risks that have caused the stocks to be out of favor and, in the opinion of the Manager, undervalued.

Nomura Core Equity Fund | Information technology sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Information technology sector risk — The risk that investment risks associated with investing in the information technology sector, in addition to other risks, include the intense competition to which information technology companies may be subject; the dramatic and often unpredictable changes in growth rates and competition for qualified personnel among information technology companies; effects on profitability from being heavily dependent on patent and intellectual property rights and the loss or impairment of those rights; obsolescence of existing technology; general economic conditions; and government regulation.

Nomura Core Equity Fund | Limited number of securities risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Limited number of securities risk — The possibility that a single security’s increase or decrease in value may have a greater impact on a fund’s value and total return because the fund may hold larger positions in fewer securities than other funds. In addition, a fund that holds a limited number of securities may be more volatile than those funds that hold a greater number of securities.

Nomura Global Growth Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Growth Fund | Market Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Growth Fund | Foreign and Emerging Markets Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Growth Fund | Liquidity Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Global Growth Fund | Industry and sector risk

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Growth Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Growth Fund | Large-capitalization company risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Growth Fund | Growth stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Growth Fund | Information technology sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Growth Fund | Limited number of securities risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Growth Fund | Currency risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Currency risk — The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.

Nomura International Core Equity Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura International Core Equity Fund | Market Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura International Core Equity Fund | Foreign and Emerging Markets Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura International Core Equity Fund | Liquidity Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura International Core Equity Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura International Core Equity Fund | Large-capitalization company risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura International Core Equity Fund | Growth stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura International Core Equity Fund | Value stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura International Core Equity Fund | Limited number of securities risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura International Core Equity Fund | Currency risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Currency risk — The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.

Nomura International Core Equity Fund | Geographic Focus Risk

Prospectus [Line Items]

Risk [Text Block]

Geographic focus risk — The risk that local political and economic conditions could adversely affect the performance of a fund investing a substantial amount of assets in securities of issuers located in a single country or a limited number of countries. At times, the Fund may invest significantly in the Asia-Pacific region. Adverse events in any one country within the Asia-Pacific region may impact the other countries in the region or Asia as a whole. As a result, adverse events in the region will generally have a greater effect on the Fund when it is invested significantly in the Asia-Pacific region than if the Fund were more geographically diversified, which could result in greater volatility in the Fund’s net asset value and losses.

Nomura Large Cap Growth Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Large Cap Growth Fund | Risk Nondiversified Status [Member]

Prospectus [Line Items]

Risk [Text Block]

Nondiversification risk — A nondiversified fund has the flexibility to invest as much as 50% of its assets in as few as two issuers with no single issuer accounting for more than 25% of the fund. The remaining 50% of its assets must be diversified so that no more than 5% of its assets are invested in the securities of a single issuer. Because a nondiversified fund may invest its assets in fewer issuers, the value of its shares may increase or decrease more rapidly than if it were fully diversified.

Nomura Large Cap Growth Fund | Market Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Large Cap Growth Fund | Liquidity Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Large Cap Growth Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Large Cap Growth Fund | Large-capitalization company risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Large Cap Growth Fund | Growth stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Large Cap Growth Fund | Information technology sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Large Cap Growth Fund | Limited number of securities risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Large Cap Growth Fund | Industry and security risks [Member]

Prospectus [Line Items]

Risk [Text Block]

Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as financials or information technology) will decline because of changing expectations for the performance of that industry or sector.

Nomura Large Cap Growth Fund | Government and regulatory risks [Member]

Prospectus [Line Items]

Risk [Text Block]

Government and regulatory risk — The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance.

Nomura Mid Cap Growth Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Mid Cap Growth Fund | Industry and sector risk

Prospectus [Line Items]

Risk [Text Block]

Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as industrials, information technology or healthcare) will decline because of changing expectations for the performance of that industry or sector.

Nomura Mid Cap Growth Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Mid Cap Growth Fund | Company size risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Mid Cap Growth Fund | Growth stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Mid Cap Growth Fund | Information technology sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Mid Cap Growth Fund | Market risk_

Prospectus [Line Items]

Risk [Text Block]

Nomura Mid Cap Growth Fund | Industrials sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Industrials sector risk — The risk that the value of a fund’s shares will be affected by factors particular to the industrials and related sectors (such as government regulation) and may fluctuate more widely than that of a fund that invests in a broad range of sectors.

Nomura Mid Cap Growth Fund | Healthcare sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Healthcare sector risk — The risk that the value of a fund’s shares will be affected by factors particular to the healthcare and related sectors (such as government regulation) and may fluctuate more widely than that of a fund that invests in a broad range of sectors.

Nomura Mid Cap Growth Fund | Liquidity risk_[Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Mid Cap Income Opportunities Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Mid Cap Income Opportunities Fund | Industry and sector risk

Prospectus [Line Items]

Risk [Text Block]

Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as consumer discretionary or industrials) will decline because of changing expectations for the performance of that industry or sector.

Nomura Mid Cap Income Opportunities Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Mid Cap Income Opportunities Fund | Company size risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Mid Cap Income Opportunities Fund | Limited number of securities risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Mid Cap Income Opportunities Fund | Market risk_

Prospectus [Line Items]

Risk [Text Block]

Nomura Mid Cap Income Opportunities Fund | Industrials sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Mid Cap Income Opportunities Fund | Liquidity risk_[Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Mid Cap Income Opportunities Fund | Divident paying stock risk

Prospectus [Line Items]

Risk [Text Block]

Dividend paying stock risk — Dividend paying stocks may fall out of favor with investors and underperform non-dividend paying stocks and the market as a whole over any period of time. In addition, there is no guarantee that the companies in which a Fund invests will declare dividends in the future or that dividends, if declared, will remain at current levels or increase over time. The amount of any dividend a company may pay may fluctuate significantly.

Nomura Smid Cap Core Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Smid Cap Core Fund | Liquidity Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Smid Cap Core Fund | Interest rate risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Interest rate risk — The risk that securities will decrease in value if interest rates rise. The risk is generally associated with bonds; however, because small- and medium-sized companies and companies in the real estate sector often borrow money to finance their operations, they may be adversely affected by rising interest rates. A fund may be subject to a greater risk of rising interest rates when interest rates are low or inflation rates are high or rising.

Nomura Smid Cap Core Fund | Industry and sector risk

Prospectus [Line Items]

Risk [Text Block]

Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as industrials) will decline because of changing expectations for the performance of that industry or sector.

Nomura Smid Cap Core Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Smid Cap Core Fund | Company size risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Smid Cap Core Fund | Government and regulatory risks [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Smid Cap Core Fund | Market risk_

Prospectus [Line Items]

Risk [Text Block]

Nomura Smid Cap Core Fund | Industrials sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Small Cap Growth Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Small Cap Growth Fund | Industry and sector risk

Prospectus [Line Items]

Risk [Text Block]

Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as information technology, industrials, or healthcare) will decline because of changing expectations for the performance of that industry or sector.

Nomura Small Cap Growth Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Small Cap Growth Fund | Company size risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Small Cap Growth Fund | Growth stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Small Cap Growth Fund | Information technology sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Small Cap Growth Fund | Market risk_

Prospectus [Line Items]

Risk [Text Block]

Nomura Small Cap Growth Fund | Industrials sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Small Cap Growth Fund | Healthcare sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Small Cap Growth Fund | Liquidity risk_[Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Small Cap Growth Fund | Initial public offering (IPO) risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Initial public offering (IPO) risk — The risk that any positive effect of investments in IPOs may not be sustainable because of a number of factors. Namely, a fund may not be able to buy shares in some IPOs, or may be able to buy only a small number of shares. Also, the performance of IPOs generally is volatile, and is dependent on market psychology and economic conditions. To the extent that IPOs have a significant positive impact on a fund’s performance, this may not be able to be replicated in the future. The relative performance impact of IPOs also is likely to decline as a fund grows.

Nomura Systematic Emerging Markets Equity Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Systematic Emerging Markets Equity Fund | Foreign and Emerging Markets Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

emerging markets may have less stable political and economic environments. In addition, there often is substantially less publicly available information about issuers and such information tends to be of a lesser quality. Economic markets and structures tend to be less mature and diverse and the securities markets may also be smaller, less liquid, and subject to greater price volatility.

Nomura Systematic Emerging Markets Equity Fund | Industry and sector risk

Prospectus [Line Items]

Risk [Text Block]

Nomura Systematic Emerging Markets Equity Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Systematic Emerging Markets Equity Fund | Company size risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Systematic Emerging Markets Equity Fund | Large-capitalization company risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Systematic Emerging Markets Equity Fund | Growth stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Systematic Emerging Markets Equity Fund | Information technology sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Systematic Emerging Markets Equity Fund | Geographic Focus Risk

Prospectus [Line Items]

Risk [Text Block]

Geographic focus risk — The risk that local political and economic conditions could adversely affect the performance of a fund investing a substantial amount of assets in securities of issuers located in a single country or a limited number of countries. Adverse events in any one country within the Asia-Pacific region may impact the other countries in the region or Asia as a whole. As a result, adverse events in the region will generally have a greater effect on a fund than if the fund were more geographically diversified, which could result in greater volatility in the fund’s net asset value and losses.

Nomura Systematic Emerging Markets Equity Fund | Market risk_

Prospectus [Line Items]

Risk [Text Block]

Nomura Systematic Emerging Markets Equity Fund | Liquidity risk_[Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Systematic Emerging Markets Equity Fund | Capital repatriation risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Capital repatriation risk — The risk that a fund may be unable to repatriate capital from its investments, in whole or in part, which may have an adverse effect on the cash flows and/or performance of the fund. Capital repatriation involves the transfer of corporate money or property from a foreign country back to its home country. The repatriation of capital with regard to investments made in certain securities or countries may be restricted during certain times from the date of such investments or even indefinitely.

Nomura Systematic Emerging Markets Equity Fund | Currency Risk

Prospectus [Line Items]

Risk [Text Block]

Currency risk — The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.

Nomura Systematic Emerging Markets Equity Fund | China investment risk [Member]

Prospectus [Line Items]

Risk [Text Block]

China investment risk — The risk that the markets in the greater China region can experience significant volatility due to social, economic, regulatory, and political uncertainties.

Nomura Climate Solutions Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Climate Solutions Fund | Risk Nondiversified Status [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Climate Solutions Fund | Foreign and Emerging Markets Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Climate Solutions Fund | Industry and sector risk

Prospectus [Line Items]

Risk [Text Block]

Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as utilities) will decline because of changing expectations for the performance of that industry or sector.

Nomura Climate Solutions Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Climate Solutions Fund | Currency risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Currency risk — The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.

Nomura Climate Solutions Fund | Market risk_

Prospectus [Line Items]

Risk [Text Block]

Nomura Climate Solutions Fund | Liquidity risk_[Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Climate Solutions Fund | Initial public offering (IPO) risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Climate Solutions Fund | Climate change investment focus risk

Prospectus [Line Items]

Risk [Text Block]

Climate change investment focus risk — The Fund’s focus on securities of issuers that seek to reduce, displace and/or sequestor GHG emissions or help other to do so may affect the Fund’s exposure to certain sectors or types of investments. The Fund’s relative investment performance may also be impacted depending on whether such sectors or investments are in or out of favor with the market. Certain investments may be dependent on U.S. and foreign government policies, including tax incentives and subsidies, as well as on political support for certain environmental initiatives and developments affecting companies focused on sustainable energy and climate change solutions generally.

Nomura Climate Solutions Fund | ESG screening risk

Prospectus [Line Items]

Risk [Text Block]

ESG screening risk — Using ESG criteria in the investment process may exclude certain companies for non-investment reasons and, therefore, the Fund may forgo some market opportunities available to funds that do not use ESG factors. In addition, because company GHG emissions data are not standardized (and are further subject to estimation error when not company-reported), the data sets the Fund must rely on may imperfectly represent companies’ true GHG emissions. Also, the company emissions targets that the Management Team sets are based on model assumptions and estimations that carry the inherent risk associated with any modeling or estimating process.

Nomura Climate Solutions Fund | Concentration risk

Prospectus [Line Items]

Risk [Text Block]

Concentration risk — The risk that a concentration in a particular industry will cause a fund to be more exposed to developments affecting that single industry or industry group than a more broadly diversified fund would be. A fund could experience greater volatility or may perform poorly during a downturn in the industry or industry group because it is more susceptible to the economic, regulatory, political, legal and other risks associated with those industries than a fund that invests more broadly.

Nomura Climate Solutions Fund | Foreign currency exchange transactions and forward foreign currency contracts risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Foreign currency exchange transactions and forward foreign currency contracts risk — The risk that a fund’s use of foreign currency exchange transactions and forward foreign currency contracts to hedge certain market risks (such as interest rates, currency exchange rates and broad or specific market movement) may increase the possibility of default by the counterparty to the transaction and, to the extent the Manager’s judgment as to certain market movements is incorrect, the risk of losses that are greater than if the investment technique had not been used.

Nomura Climate Solutions Fund | Government and Regulatory Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Natural Resources Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Natural Resources Fund | Market Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Natural Resources Fund | Foreign and Emerging Markets Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Natural Resources Fund | Commodity-related investments risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Commodity-related investments risk — The value of commodities investments will generally be affected by overall market movements and factors specific to a particular industry or commodity, which may include weather, embargoes, tariffs, and economic health, political, international regulatory and other developments. Exposure to the commodities markets may subject a fund to greater volatility than investments in traditional securities. The investment team does not plan to always implement exposure to commodities in the Fund, however they will consider holding commodity exchange traded funds in market scenarios where inflation is running higher than normal and their asset allocation model signals for additional commodity exposure. In addition, the Fund may use futures and options on commodities for a variety of purposes such as hedging against adverse changes in the market prices of securities, as a substitute for purchasing or selling securities, to increase the Fund’s return as a non-hedging strategy that may be considered speculative and to manage the Fund’s portfolio characteristics.

Nomura Natural Resources Fund | Liquidity Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Natural Resources Fund | Industry and sector risk

Prospectus [Line Items]

Risk [Text Block]

Industry and sector risk — The risk that the value of securities in a particular industry or sector (such as natural resources) will decline because of changing expectations for the performance of that industry or sector.

Nomura Natural Resources Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Natural Resources Fund | Growth stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Natural Resources Fund | Value stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Value stock risk — The risk that the value of a security believed by the management team to be undervalued may never reach what is believed to be its full value; such security’s value may decrease or such security may be appropriately priced. Value stocks are stocks of companies that may have experienced adverse business or industry developments or may be subject to special risks that have caused the stocks to be out of favor and, in the opinion of the management team, undervalued.

Nomura Natural Resources Fund | Limited number of securities risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Natural Resources Fund | Currency risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Currency risk — The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.

Nomura Natural Resources Fund | Concentration risk

Prospectus [Line Items]

Risk [Text Block]

Nomura Natural Resources Fund | Foreign currency exchange transactions and forward foreign currency contracts risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Foreign currency exchange transactions and forward foreign currency contracts risk — The risk that a fund’s use of foreign currency exchange transactions and forward foreign currency contracts to hedge certain market risks (such as interest rates, currency exchange rates and broad or specific market movement) may increase the possibility of default by the counterparty to the transaction and, to the extent the management team’s judgment as to certain market movements is incorrect, the risk of losses that are greater than if the investment technique had not been used.

Nomura Natural Resources Fund | Natural resources industry risk

Prospectus [Line Items]

Risk [Text Block]

Natural resources industry risk — Investment risks associated with investing in securities of natural resources companies, in addition to other risks, include price fluctuation caused by real and perceived inflationary trends and political developments, the cost assumed by natural resource companies in complying with environmental and safety regulations, changes in supply of, or demand for, various natural resources, changes in energy prices, environmental incidents, energy conservation, the success of exploration projects, changes in commodity prices, and special risks associated with natural or man-made disasters. Securities of natural resource companies that are dependent on a single commodity, or are concentrated in a single commodity sector, may exhibit high volatility attributable to commodity prices.

Nomura Natural Resources Fund | Energy sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Energy sector risk — The risk that investment risks associated with investing in energy securities, in addition to other risks, include price fluctuation caused by real and perceived inflationary trends and political developments, the cost assumed in complying with environmental safety regulations, demand of energy fuels, energy conservation, the success of exploration projects, and tax and other governmental regulations.

Nomura Real Estate Securities Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Real Estate Securities Fund | Market Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Real Estate Securities Fund | Liquidity Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Real Estate Securities Fund | Interest rate risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Real Estate Securities Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Real Estate Securities Fund | REIT-related risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Real Estate Securities Fund | Limited number of securities risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Real Estate Securities Fund | Concentration risk

Prospectus [Line Items]

Risk [Text Block]

Nomura Real Estate Securities Fund | Real estate industry risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Real estate industry risk — This risk includes, among others: possible declines in the value of real estate; risks related to general and local economic conditions; possible lack of availability of mortgage funds; overbuilding; extended vacancies of properties; increases in competition, property taxes, and operating expenses; changes in zoning laws; costs resulting from the cleanup of, and liability to third parties resulting from, environmental problems; casualty for condemnation losses; uninsured damages from floods, earthquakes, or other natural disasters; limitations on and variations in rents; and changes in interest rates.

Nomura Real Estate Securities Fund | Real assets industries risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Real assets industries risk — The risk that the value of a fund’s shares will be affected by factors particular to real assets securities and related industries or sectors (such as government regulation) and may fluctuate more widely than that of a fund that invests in a broad range of industries.

Nomura Real Estate Securities Fund | REOC-related risk

Prospectus [Line Items]

Risk [Text Block]

REOC-related risk — The risk that the value of a fund’s REOC securities may be adversely affected by certain of the same factors that adversely affect REITs and also that a fund may experience a decline in its income from REOC securities due to falling interest rates or decreasing dividend payments.

Nomura Science and Technology Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Science and Technology Fund | Risk Nondiversified Status [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Science and Technology Fund | Market Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Science and Technology Fund | Foreign and Emerging Markets Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Science and Technology Fund | Liquidity Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Science and Technology Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Science and Technology Fund | Company size risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Science and Technology Fund | Large-capitalization company risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Science and Technology Fund | Growth stock risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Growth stock risk — Growth stocks reflect projections of future earnings and revenue. These prices may rise or fall dramatically depending on whether those projections are met. These companies’ stock prices may be more volatile, particularly over the short term.

Nomura Science and Technology Fund | Information technology sector risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Science and Technology Fund | Limited number of securities risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Science and Technology Fund | Concentration risk

Prospectus [Line Items]

Risk [Text Block]

Concentration risk — The risk that a concentration in a particular industry will cause a fund to be more exposed to developments affecting that single industry or industry group than a more broadly diversified fund would be. A fund could experience greater volatility or may perform poorly during a downturn in the industry or industry group because it may be more susceptible to the economic, regulatory, political, legal and other risks associated with those industries than a fund that invests more broadly.

Nomura Science and Technology Fund | Science and technology industry risk

Prospectus [Line Items]

Risk [Text Block]

Science and technology industry risk — The risk that investment risks associated with investing in science and technology securities, in addition to other risks, include: operating in rapidly changing fields, abrupt or erratic market movements, limited product lines, markets or financial resources, management that is dependent on a limited number of people, short product cycles, aggressive pricing of products and services, new market entrants and obsolescence of existing technology. In addition, these securities may be impacted by commodity and energy prices, which can be volatile, and may increase the volatility of these securities.

Nomura Global Bond Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Bond Fund | Foreign and Emerging Markets Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Bond Fund | Credit risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Bond Fund | High Yield (Junk) Bond Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Bond Fund | Loans and Other Direct Indebtedness Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Loans and other direct indebtedness risk — The risk that a fund will not receive payment of principal, interest, and other amounts due in connection with these investments and will depend primarily on the financial condition of the borrower and the lending institution. A fund’s ability to sell its loans or to realize their full value upon sale may also be impaired due to the lack of an active trading market, irregular trading activity, wide bid/ask spreads, contractual restrictions, and extended trade settlement periods. In addition, certain loans in which a fund invests may not be considered securities. A fund therefore may not be able to rely upon the anti-fraud provisions of the federal securities laws with respect to these investments.

Nomura Global Bond Fund | Liquidity Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura Global Bond Fund | Interest rate risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Bond Fund | Mortgage-Backed and Asset-Backed Securities Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

experience reduced liquidity due to changes in interest rates or general economic conditions. Certain mortgage-backed or asset-backed securities, such as collateralized mortgage obligations, real estate mortgage investment conduits, and stripped mortgage-backed securities, may be more susceptible to these risks than other mortgage-backed, asset-backed, or fixed-income securities.

Nomura Global Bond Fund | US Government Securities Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Bond Fund | Derivatives Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Bond Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Bond Fund | Capital repatriation risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Bond Fund | Currency Risk

Prospectus [Line Items]

Risk [Text Block]

Currency risk — The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.

Nomura Global Bond Fund | Government and Regulatory Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura Global Bond Fund | Prepayment Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Prepayment risk — The risk that the principal on a bond that is held by a fund will be prepaid prior to maturity at a time when interest rates are lower than what that bond was paying. A fund may then have to reinvest that money at a lower interest rate.

Nomura Global Bond Fund | Portfolio Turnover Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Portfolio turnover risk — High portfolio turnover rates may increase a fund’s transaction costs and lower returns.

Nomura High Income Fund | Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura High Income Fund | Credit risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura High Income Fund | High Yield (Junk) Bond Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura High Income Fund | Loans and Other Direct Indebtedness Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura High Income Fund | Liquidity Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk — The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Nomura High Income Fund | Interest rate risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura High Income Fund | Subsidiary risk

Prospectus [Line Items]

Risk [Text Block]

Nomura High Income Fund | Active management and selection risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura High Income Fund | Foreign Risk

Prospectus [Line Items]

Risk [Text Block]

Nomura High Income Fund | Currency Risk

Prospectus [Line Items]

Risk [Text Block]

Currency risk — The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.

Nomura High Income Fund | Prepayment Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Nomura High Income Fund | Distressed securities risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Distressed securities risk — The market for distressed securities and instruments is generally thinner and less active than other markets, which can adversely affect the prices at which distressed securities can be sold.

Nomura High Income Fund | New issue risk [Member]

Prospectus [Line Items]

Risk [Text Block]

New issue risk — New issues may have limited markets, making valuation and selling difficult. The market value of newly issued securities may fluctuate considerably.

Nomura High Income Fund | Payment-in-kind securities risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Payment-in-kind securities risk — Payment-in-kind securities defer cash interest payments by treating them as additional principal. This results in higher total debt and the potential for increased default risk of the issuer.

Nomura High Income Fund | Deferred payment securities risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Deferred payment securities risk — These securities may be subject to greater price fluctuations when interest rates change than securities that currently pay interest. During the time that interest payments are not being made on these securities, holders are deemed to receive income annually, even though cash is not received.

Nomura High Income Fund | Restricted securities risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Restricted securities risk — The risk that restricted securities are subject to legal or contractual restrictions on resale, and there can be no assurance of a ready market for resale. These securities include private placements or other unregistered securities, such as “Rule 144A Securities”, which are securities that may be sold only to qualified institutional buyers pursuant to the Securities Act of 1933, as amended (1933 Act). Privately placed securities, Rule 144A securities and other restricted securities may have the effect of increasing the level of Fund illiquidity to the extent the Fund finds it difficult to sell these securities when the Sub-Advisor believes it is desirable to do so, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer, and the prices realized could be less than those originally paid, or less than the fair market value. At times, the illiquidity of the market, as well as the lack of publicly available information regarding these securities also may make it difficult to determine the fair market value of such securities for purposes of computing the NAV of the Fund.