Investment Strategy	Jul. 31, 2025
(Nomura Strategic Income Fund - Classes A, C, R and Institutional) \| Nomura Strategic Income Fund
Prospectus [Line Items]
Strategy [Heading]	What are the Fund’s principal investment strategies?
Strategy Narrative [Text Block]	Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in US and foreign debt securities, including those in emerging markets (80% policy). Debt securities include all varieties of fixed, variable and floating rate income securities, including bonds, US and foreign government and agency securities, corporate loans (and loan participations), and mortgage-backed securities and other asset-backed securities. To achieve the Fund’s investment objectives, the Manager will allocate investments among various sectors of debt securities and at any given time may have a substantial amount of its assets invested in any class of debt security. The Fund may invest up to 100% of its net assets in high yield, lower-quality debt securities (also known as “junk bonds”). The Fund may invest up to 100% of its net assets in foreign securities, including emerging markets securities. The Fund’s total non-US dollar currency exposure may reach 100% of net assets. Due to the manner in which the Fund is managed, it may be subject to a high rate of portfolio turnover. The Fund may hold a substantial portion of its assets in cash or short-term fixed income obligations in unusual market conditions to meet redemption requests, for temporary defensive purposes, and pending investment. The Fund may also use a wide range of derivatives instruments, typically including forward foreign currency contracts, options, futures contracts, options on futures contracts, and swaps. The Fund may use derivatives for both hedging and nonhedging purposes. For example, the Fund may invest in: futures and options to manage duration and for defensive purposes, such as to protect gains or hedge against potential losses in the portfolio without actually selling a security, or to stay fully invested; forward foreign currency contracts to manage foreign currency exposure; interest rate swaps to neutralize the impact of interest rate changes; credit default swaps to hedge against a credit event, to gain exposure to certain securities or markets, or to enhance total return; and index swaps to enhance return or to affect diversification. The 80% policy is nonfundamental and may be changed without shareholder approval. Fund shareholders would be given at least 60 days’ notice prior to any such change.
Strategy Portfolio Concentration [Text]	Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in US and foreign debt securities, including those in emerging markets (80% policy).
(Nomura Emerging Markets Debt Corporate Fund - Classes A, C and Institutional) \| Nomura Emerging Markets Debt Corporate Fund
Prospectus [Line Items]
Strategy [Heading]	What are the Fund’s principal investment strategies?
Strategy Narrative [Text Block]	Under normal circumstances, the Fund will invest at least 80% of its net assets, plus borrowings for investment purposes, in emerging markets corporate debt securities (80% policy). For purposes of the 80% policy, emerging markets corporate debt securities include those that are (1) economically tied to an emerging market country or countries, (2) issued or guaranteed by a company domiciled or conducting significant business activities in an emerging market country, or (3) derivatives or pooled structures (such as exchange-traded funds (ETFs)) that are linked to emerging markets corporate debt securities. Emerging market countries include those currently considered to be developing or emerging countries by the World Bank, the United Nations, the countries’ governments, or in the judgment of the Manager. These debt instruments will be denominated primarily in the currencies of members of the Organization for Economic Cooperation and Development (OECD) and in other emerging markets’ currencies and may include a significant percentage of high yield (junk) corporate bonds. While there is no percentage limit on the amount of the Fund’s assets that may be invested in high yield (junk) corporate bonds, the Manager generally expects that 50% of the Fund’s assets will be invested in high yield corporate bonds. The Fund may also use a wide variety of derivatives instruments, including credit linked notes, interest rate, index and credit default swaps, forward foreign currency contracts, futures, and options. The Fund will use derivatives for both hedging and nonhedging purposes. For example, the Fund may invest in: futures and options to manage duration and for defensive purposes, such as to protect gains or hedge against potential losses in the Fund without actually selling a security, or to stay fully invested; forward foreign currency contracts to manage foreign currency exposure; interest rate swaps to neutralize the impact of interest rate changes; credit default swaps to hedge against a credit event, to gain exposure to certain securities or markets, or to enhance total return; and index swaps to enhance return or to effect diversification. The Manager may also establish short positions through derivatives in an attempt to isolate, manage, or reduce the risk of individual positions, or positions in the aggregate, or to take advantage of an anticipated deterioration in the creditworthiness of an issuer. The Fund may employ leverage, such as by entering into reverse repurchase transactions, to attempt to take advantage of or increase the total return of attractive investment opportunities. The 80% policy is nonfundamental and may be changed without shareholder approval. Fund shareholders would be given at least 60 days’ notice prior to any such change.
Strategy Portfolio Concentration [Text]	Under normal circumstances, the Fund will invest at least 80% of its net assets, plus borrowings for investment purposes, in emerging markets corporate debt securities (80% policy).

Investment Strategy

Jul. 31, 2025

What are the Fund’s principal investment strategies?

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in US and foreign debt securities, including those in emerging markets (80% policy). Debt securities include all varieties of fixed, variable and floating rate income securities, including bonds, US and foreign government and agency securities, corporate loans (and loan participations), and mortgage-backed securities and other asset-backed securities. To achieve the Fund’s investment objectives, the Manager will allocate investments among various sectors of debt securities and at any given time may have a substantial amount of its assets invested in any class of debt security.

The Fund may invest up to 100% of its net assets in high yield, lower-quality debt securities (also known as “junk bonds”).

The Fund may invest up to 100% of its net assets in foreign securities, including emerging markets securities. The Fund’s total non-US dollar currency exposure may reach 100% of net assets. Due to the manner in which the Fund is managed, it may be subject to a high rate of portfolio turnover.

The Fund may hold a substantial portion of its assets in cash or short-term fixed income obligations in unusual market conditions to meet redemption requests, for temporary defensive purposes, and pending investment. The Fund may also use a wide range of derivatives instruments, typically including forward foreign currency contracts, options, futures contracts, options on futures contracts, and swaps. The Fund may use derivatives for both hedging and nonhedging purposes. For example, the Fund may invest in: futures and options to manage duration and for defensive purposes, such as to protect gains or hedge against potential losses in the portfolio without actually selling a security, or to stay fully invested; forward foreign currency contracts to manage foreign currency exposure; interest rate swaps to neutralize the impact of interest rate changes; credit default swaps to hedge against a credit event, to gain exposure to certain securities or markets, or to enhance total return; and index swaps to enhance return or to affect diversification.

The 80% policy is nonfundamental and may be changed without shareholder approval. Fund shareholders would be given at least 60 days’ notice prior to any such change.

Strategy Portfolio Concentration [Text]

(Nomura Emerging Markets Debt Corporate Fund - Classes A, C and Institutional) | Nomura Emerging Markets Debt Corporate Fund

Prospectus [Line Items]

Strategy [Heading]

What are the Fund’s principal investment strategies?

Strategy Narrative [Text Block]

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus borrowings for investment purposes, in emerging markets corporate debt securities (80% policy). For purposes of the 80% policy, emerging markets corporate debt securities include those that are (1) economically tied to an emerging market country or countries, (2) issued or guaranteed by a company domiciled or conducting significant business activities in an emerging market country, or (3) derivatives or pooled structures (such as exchange-traded funds (ETFs)) that are linked to emerging markets corporate debt securities. Emerging market countries include those currently considered to be developing or emerging countries by the World Bank, the United Nations, the countries’ governments, or in the judgment of the Manager. These debt instruments will be denominated primarily in the currencies of members of the Organization for Economic Cooperation and Development (OECD) and in other emerging markets’ currencies and may include a significant percentage of high yield (junk) corporate bonds. While there is no percentage limit on the amount of the Fund’s assets that may be invested in high yield (junk) corporate bonds, the Manager generally expects that 50% of the Fund’s assets will be invested in high yield corporate bonds.

The Fund may also use a wide variety of derivatives instruments, including credit linked notes, interest rate, index and credit default swaps, forward foreign currency contracts, futures, and options. The Fund will use derivatives for both hedging and nonhedging purposes. For example, the Fund may invest in: futures and options to manage duration and for defensive purposes, such as to protect gains or hedge against potential losses in the Fund without actually selling a security, or to stay fully invested; forward foreign currency contracts to manage foreign currency exposure; interest rate swaps to neutralize the impact of interest rate changes; credit default swaps to hedge against a credit event, to gain exposure to certain securities or markets, or to enhance total return; and index swaps to enhance return or to effect diversification. The Manager may also establish short positions through derivatives in an attempt to isolate, manage, or reduce the risk of individual positions, or positions in the aggregate, or to take advantage of an anticipated deterioration in the creditworthiness of an issuer. The Fund may employ leverage, such as by entering into reverse repurchase transactions, to attempt to take advantage of or increase the total return of attractive investment opportunities.

The 80% policy is nonfundamental and may be changed without shareholder approval. Fund shareholders would be given at least 60 days’ notice prior to any such change.

Strategy Portfolio Concentration [Text]

Under normal circumstances, the Fund will invest at least 80% of its net assets, plus borrowings for investment purposes, in emerging markets corporate debt securities (80% policy).