Limited Duration Bond ETF Investment Strategy - Limited Duration Bond ETF	Feb. 28, 2026
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">What are the Fund’s main investment strategies?</span>
Strategy Narrative [Text Block]	The Fund mainly invests in mortgage-backed securities, asset-backed securities, mortgage-related securities, adjustable rate mortgages, money market instruments, and structured investments. These investments may be structured as collateralized mortgage obligations (agency and non-agency), stripped mortgage-backed securities, commercial mortgage-backed securities, and mortgage pass-through securities. These securities may be structured such that payments consist of interest-only (IO), principal-only (PO) or principal and interest. Under normal circumstances, the Fund will invest at least 80% of its Assets in bonds. For purposes of this policy, “Assets” means net assets plus the amount of borrowings for investment purposes. A “bond” is a debt security with a maturity of 90 days or more at the time of its issuance. The Fund seeks to maintain a duration of three years or less, although, under certain market conditions such as in periods of significant volatility in interest rates and spreads, the Fund’s duration may be longer than three years. Duration is a measure of the price sensitivity of a debt security or a portfolio of debt securities to relative changes in interest rates. For instance, a duration of “three years” means that a security’s or portfolio’s price would be expected to decrease by approximately 3% with a 1% increase in interest rates (assuming a parallel shift in yield curve). The Fund invests in fixed and floating rate debt securities representing an interest in or secured by residential mortgage loans. These securities often are issued or guaranteed by the U.S. government, its agencies or instrumentalities such as the Government National Mortgage Association (Ginnie Mae), the Federal National Mortgage Association (Fannie Mae) or the Federal Home Loan Mortgage Corporation (Freddie Mac).However, the Fund may also purchase mortgage-backed securities and asset-backed securities that are issued by non-governmental entities. Such securities may or may not have private insurer guarantees of timely payments. Securities purchased by the Fund will be rated investment grade (or the unrated equivalent) at the time of purchase. In addition, all securities will be U.S. dollar-denominated although they may be issued by a foreign corporation, or a U.S. affiliate of a foreign corporation or a foreign government or its agencies and instrumentalities. The Fund may also invest in corporate debt securities that are issued by a U.S. corporation. The Fund may invest a significant portion or all of its assets in mortgage-related and mortgage-backed securities at the adviser’s discretion. The Fund may invest up to 25% of its assets in “sub-prime” mortgage-related securities at the time of purchase. The Fund has flexibility to invest in derivatives and may use such instruments to manage duration, sector and yield curve exposure, credit and spread volatility and to respond to volatile market conditions. Derivatives, which are instruments which have a value based on another instrument, exchange rate or index, may also be used as substitutes for securities in which the Fund can invest. The Fund may use futures contracts, options, and swaps in connection with its principal strategies in order to hedge various investments, for risk management purposes and/or to increase income or gain to the Fund. The adviser buys and sells securities and investments for the Fund based on its view of individual securities and market sectors. Taking a long-term approach, the adviser looks for individual fixed income investments that it believes will perform well over market cycles. The adviser is value oriented and makes decisions to purchase and sell individual securities and instruments after performing a risk/reward analysis that includes an evaluation of interest rate risk, credit risk, duration, liquidity, legal provisions and the structure of the transaction. As part of its security selection process, the adviser seeks to assess the impact of environmental, social and governance (ESG) factors on certain issuers in the universe in which the Fund may invest. The adviser’s assessment is based on an analysis of key opportunities and risks across industries to seek to identify financially material issues with respect to the Fund’s investments in issuers and ascertain key issues that merit engagement with issuers. These assessments may not be conclusive and securities of issuers that may be negatively impacted by such factors may be purchased and retained by the Fund while the Fund may divest or not invest in securities of issuers that may be positively impacted by such factors.

Limited Duration Bond ETF Investment Strategy - Limited Duration Bond ETF

Feb. 28, 2026

<span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">What are the Fund’s main investment strategies?</span>

Strategy Narrative [Text Block]

The Fund mainly invests in mortgage-backed securities, asset-backed securities, mortgage-related securities, adjustable rate mortgages, money market instruments, and structured investments. These investments may be structured as collateralized mortgage obligations (agency and non-agency), stripped mortgage-backed securities, commercial mortgage-backed securities, and mortgage pass-through securities. These securities may be structured such that payments consist of interest-only (IO), principal-only (PO) or principal and interest. Under normal circumstances, the Fund will invest at least 80% of its Assets in bonds. For purposes of this policy, “Assets” means net assets plus the amount of borrowings for investment purposes. A “bond” is a debt security with a maturity of 90 days or more at the time of its issuance. The Fund seeks to maintain a duration of three years or less, although, under certain market conditions such as in periods of significant volatility in interest rates and spreads, the Fund’s duration may be longer than three years. Duration is a measure of the price sensitivity of a debt security or a portfolio of debt securities to relative changes in interest rates. For instance, a duration of “three years” means that a security’s or portfolio’s price would be expected to decrease by approximately 3% with a 1% increase in interest rates (assuming a parallel shift in yield curve). The Fund invests in fixed and floating rate debt securities representing an interest in or secured by residential mortgage loans. These securities often are issued or guaranteed by the U.S. government, its agencies or instrumentalities such as the Government National Mortgage Association (Ginnie Mae), the Federal National Mortgage Association (Fannie Mae) or the Federal Home Loan Mortgage Corporation (Freddie Mac).However, the Fund may also purchase mortgage-backed securities and asset-backed securities that are issued by non-governmental entities. Such securities may or may not have private insurer guarantees of timely payments. Securities purchased by the Fund will be rated investment grade (or the unrated equivalent) at the time of purchase. In addition, all securities will be U.S. dollar-denominated although they may be issued by a foreign corporation, or a U.S. affiliate of a foreign corporation or a foreign government or its agencies and instrumentalities. The Fund may also invest in corporate debt securities that are issued by a U.S. corporation. The Fund may invest a significant portion or all of its assets in mortgage-related and mortgage-backed securities at the adviser’s discretion. The Fund may invest up to 25% of its assets in “sub-prime” mortgage-related securities at the time of purchase. The Fund has flexibility to invest in derivatives and may use such instruments to manage duration, sector and yield curve exposure, credit and spread volatility and to respond to volatile market conditions. Derivatives, which are instruments which have a value based on another instrument, exchange rate or index, may also be used as substitutes for securities in which the Fund can invest. The Fund may use futures contracts, options, and swaps in connection with its principal strategies in order to hedge various investments, for risk management purposes and/or to increase income or gain to the Fund. The adviser buys and sells securities and investments for the Fund based on its view of individual securities and market sectors. Taking a long-term approach, the adviser looks for individual fixed income investments that it believes will perform well over market cycles. The adviser is value oriented and makes decisions to purchase and sell individual securities and instruments after performing a risk/reward analysis that includes an evaluation of interest rate risk, credit risk, duration, liquidity, legal provisions and the structure of the transaction. As part of its security selection process, the adviser seeks to assess the impact of environmental, social and governance (ESG) factors on certain issuers in the universe in which the Fund may invest. The adviser’s assessment is based on an analysis of key opportunities and risks across industries to seek to identify financially material issues with respect to the Fund’s investments in issuers and ascertain key issues that merit engagement with issuers. These assessments may not be conclusive and securities of issuers that may be negatively impacted by such factors may be purchased and retained by the Fund while the Fund may divest or not invest in securities of issuers that may be positively impacted by such factors.