v3.26.1
Ultra-Short Income ETF Investment Risks - Ultra-Short Income ETF
Feb. 28, 2026
General Market Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] General Market Risk. Economies and financial markets throughout the world are becoming increasingly interconnected, which increases the likelihood that events or conditions in one country or region will adversely impact markets or issuers in other countries or regions. Securities in the Fund’s portfolio may underperform in comparison to securities in general financial markets, a particular financial market or other asset classes due to a number of factors, including inflation (or expectations for inflation), deflation (or expectations for deflation), interest rates, global demand for particular products or resources, market instability, financial system instability, debt crises and downgrades, embargoes, tariffs, trade wars, retaliatory trade measures, sanctions and other trade barriers, supply chain disruptions, regulatory events, other governmental trade or market control programs and related geopolitical events. In addition, the value of the Fund’s investments may be negatively affected by the occurrence of global events such as war, terrorism, environmental disasters, natural disasters or events, country instability, and infectious disease epidemics or pandemics or the threat or potential of one or more such factors and occurrences.
Foreign Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Foreign Securities Risk. U.S. dollar denominated securities of foreign issuers or U.S. affiliates of foreign issuers may be subject to additional risks not faced by domestic issuers. These risks include political and economic risks, civil conflicts and war, greater volatility, expropriation and nationalization risks, sanctions or other measures by the United States or other governments, higher transaction costs, delayed settlement, possible foreign controls on investments, liquidity risks and less stringent investor protection and disclosure standards of foreign markets. The securities markets of many foreign countries are relatively small, with a limited number of companies representing a small number of industries. A Fund may also invest in non-dollar denominated securities. Investments in non-dollar denominated securities are subject to risks in addition to those summarized above including currency fluctuations, higher transaction costs, delayed settlement, possible foreign controls on investment, and less stringent investor protection and disclosure standards of foreign markets. In certain markets where securities and other instruments are not traded “delivery versus payment,” the Fund may not receive timely payment for securities or other instruments it has delivered or receive delivery of securities paid for and may be subject to increased risk that the counterparty will fail to make payments or delivery when due or default completely. Foreign market trading hours, clearance and settlement procedures, and holiday schedules may limit the Fund’s ability to buy and sell securities. Events and evolving conditions in certain economies or markets may alter the risks associated with investments tied to countries or regions that historically were perceived as comparatively stable becoming riskier and more volatile.
Geographic Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Geographic Focus Risk. The Fund may focus its investments in one or more regions or small groups of countries. As a result, the Fund’s performance may be subject to greater volatility than a more geographically diversified fund.
Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Interest Rate Risk. The Fund’s investments in bonds and other debt securities will change in value based on changes in interest rates. If rates increase, the value of these investments generally declines. Securities with greater interest rate sensitivity and longer maturities generally are subject to greater fluctuations in value. The Fund may invest in variable and floating rate securities. Although these instruments are generally less sensitive to interest rate changes than fixed rate instruments, the value of variable and floating rate securities may decline if their interest rates do not rise as quickly, or as much, as general interest rates. The Fund may face a heightened level of interest rate risk due to certain changes in monetary policy. It is difficult to predict the pace at which central banks or monetary authorities may change interest rates or the timing, frequency, or magnitude of such changes. Any such changes could be sudden and could expose debt markets to significant volatility and reduced liquidity for Fund investments.
Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Credit Risk. The Fund’s investments are subject to the risk that issuers, guarantors and/or counterparties will fail to make payments when due or default completely. Prices of the Fund’s investments may be adversely affected if any of the issuers or counterparties it is invested in are subject to an actual or perceived deterioration in their credit quality. Credit spreads may increase, which may reduce the market values of the Fund’s securities. Credit spread risk is the risk that economic and market conditions or any actual or perceived credit deterioration may lead to an increase in the credit spreads (i.e., the difference in yield between two securities of similar maturity but different credit quality) and a decline in price of the issuer’s securities.
Sovereign Debt Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Sovereign Debt Risk. The Fund may invest in securities issued or guaranteed by foreign governmental entities (known as sovereign debt securities). These investments are subject to the risk of payment delays or defaults, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, large debt positions relative to the country’s economy or failure to implement economic reforms. There is no legal or bankruptcy process for collecting sovereign debt.
High Yield Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] High Yield Securities Risk. The Fund may invest in debt securities that are considered to be speculative (commonly known as junk bonds). These securities are issued by companies that are highly leveraged, less creditworthy or financially distressed. These investments are considered to be speculative and may be subject to greater risk of loss (including substantial or total loss), greater sensitivity to economic changes, valuation difficulties and potential illiquidity. Such investments may be subject to additional risks including subordination to other creditors, no collateral or limited rights in collateral, lack of a regular trading market, liquidity risks, prepayment risks, and lack of publicly available information. High yield securities that are deemed to be liquid at the time of purchase may become illiquid. In recent years, there has been a broad trend of weaker or less restrictive covenant protections in the high yield market. Among other things, under such weaker or less restrictive covenants, borrowers might be able to exercise more flexibility with respect to certain activities than borrowers who are subject to stronger or more protective covenants. For example, borrowers might be able to incur more debt, including secured debt, return more capital to shareholders, remove or reduce assets that are designated as collateral securing high yield securities, increase the claims against assets that are permitted against collateral securing high yield securities or otherwise manage their business in ways that could impact creditors negatively. In addition, certain privately held borrowers might be permitted to file less frequent, less detailed or less timely financial reporting or other information, which could negatively impact the value of the high yield securities issued by such borrowers. Each of these factors might negatively impact the high yield instruments held by the Fund. No active trading market may exist for some instruments and certain investments may be subject to restrictions on resale. The inability to dispose of the Fund’s securities and other investments in a timely fashion could result in losses to the Fund. Because some instruments may have a more limited secondary market, liquidity risk may be more pronounced for the Fund. When instruments are prepaid, the Fund may have to reinvest in instruments with a lower yield or fail to recover additional amounts (i.e., premiums) paid for these instruments, resulting in an unexpected capital loss and/or a decrease in the amount of dividends and yield.
Derivatives Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Derivatives Risk. Derivatives, including futures contracts, may be riskier than other types of investments and may increase the volatility of the Fund. Derivatives may be sensitive to changes in economic and market conditions and may create leverage, which could result in losses that significantly exceed the Fund’s original investment. Certain derivatives expose the Fund to counterparty risk, which is the risk that the derivative counterparty will not fulfill its contractual obligations (and includes credit risk associated with the counterparty). Certain derivatives are synthetic instruments that attempt to replicate the performance of certain reference assets. With regard to such derivatives, the Fund does not have a claim on the reference assets and is subject to enhanced counterparty risk. Derivatives may not perform as expected, so the Fund may not realize the intended benefits. When used for hedging, the change in value of a derivative may not correlate as expected with the currency, security or other risk being hedged. In addition, given their complexity, derivatives expose the Fund to risks of mispricing or improper valuation. Derivatives also can expose the Fund to derivative liquidity risk, which includes risks involving the liquidity demands that derivatives can create to make payments of margin, collateral, or settlement payments to counterparties, legal risk, which includes the risk of loss resulting from insufficient or unenforceable contractual documentation, insufficient capacity or authority of the Fund’s counterparty and operational risk, which includes documentation or settlement issues, system failures, inadequate controls and human error. Certain of the Fund’s transactions in foreign currency derivatives and other derivatives could also affect the amount, timing and character of distributions to shareholders which may result in the Fund realizing more ordinary income and short-term capital gain subject to tax at ordinary income tax rates than it would if it did not engage in such transactions, which may adversely impact the Fund’s after-tax returns.
Government Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Government Securities Risk. The Fund invests in securities issued or guaranteed by the U.S. government or its agencies and instrumentalities (such as securities issued by the Government National Mortgage Association (Ginnie Mae), the Federal National Mortgage Association (Fannie Mae) or the Federal Home Loan Mortgage Corporation (Freddie Mac)). U.S. government securities are subject to market risk, interest rate risk and credit risk. Securities, such as those issued or guaranteed by Ginnie Mae or the U.S. Treasury, that are backed by the full faith and credit of the United States are guaranteed only as to the timely payment of interest and principal when held to maturity and the market prices for such securities will fluctuate. The income generated by investments may not keep pace with inflation. Actions by governments and central banking authorities could result in changes in interest rates. Periods of higher inflation could cause such authorities to raise interest rates, which may adversely affect the Fund and its investments. Notwithstanding that these securities are backed by the full faith and credit of the United States, circumstances could arise that would prevent the payment of interest or principal. This would result in losses to the Fund. Securities issued or guaranteed by U.S. government-related organizations, such as Fannie Mae and Freddie Mac, are not backed by the full faith and credit of the U.S. government and no assurance can be given that the U.S. government will provide financial support. Therefore, U.S. government-related organizations may not have the funds to meet their payment obligations in the future.
Asset Backed Mortgage Related and Mortgage Backed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Asset-Backed, Mortgage-Related and Mortgage-Backed Securities Risk. The Fund may invest in asset-backed, mortgage-related and mortgage-backed securities including so called “sub-prime” mortgages, which may represent interests in pools of mortgages, consumer loans or other assets held in trust, that are subject to certain other risks including prepayment and call risks. When mortgages and other obligations are prepaid and when securities are called, the Fund may have to reinvest in securities with a lower yield or fail to recover additional amounts (i.e., premiums) paid for securities with higher interest rates, resulting in an unexpected capital loss and/or a decrease in the amount of dividends and yield. In periods of either rising or declining interest rates, the Fund may be subject to extension risk, and may receive principal later than expected. As a result, in periods of rising interest rates, the Fund may exhibit additional volatility. During periods of difficult or frozen credit markets, significant changes in interest rates or deteriorating economic conditions, such securities may decline in value, face valuation difficulties, become more volatile and/or become illiquid. Additionally, asset-backed, mortgage-related and mortgage-backed securities are subject to risks associated with their structure and the nature of the assets underlying the securities and the servicing of those assets. Certain asset-backed, mortgage-related and mortgage-backed securities may face valuation difficulties and may be less liquid than other types of asset-backed, mortgage-related and mortgage-backed securities, or debt securities. Asset-backed securities in which the Fund may invest also include CLOs, which are trusts or other special purpose entities (SPEs) collateralized by pools of loans. Collateralized mortgage obligations (CMOs) and stripped mortgage-backed securities, including those structured as IOs and POs, are more volatile and may be more sensitive to the rate of prepayments than other mortgage-related securities. The risk of default, as described under “Credit Risk,” for “sub-prime” mortgages is generally higher than other types of mortgage-backed securities. The structure of some of these securities may be complex and there may be less available information than other types of debt securities.
Prepayment Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Prepayment Risk. The issuer of certain securities may repay principal in advance, especially when yields fall. Changes in the rate at which prepayments or redemptions occur can affect the return on investment of these securities. When debt obligations are prepaid or when securities are called, the Fund may have to reinvest in securities with a lower yield. The Fund also may fail to recover additional amounts (i.e., premiums) paid for securities with higher coupons, resulting in an unexpected capital loss.
Zero-Coupon Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Zero-Coupon Securities Risk. The market value of a zero-coupon security is generally more volatile than the market value of, and is more likely to respond to a greater degree to changes in interest rates and credit quality than, other fixed income securities with similar maturities and credit quality that pay interest periodically. In addition, federal income tax law requires that the holder of a zero-coupon security accrue a portion of the discount at which the security was purchased as taxable income each year. The Fund may consequently have to dispose of portfolio securities under disadvantageous circumstances to generate cash to satisfy its requirement as a regulated investment company to distribute all of its net income (including non-cash income attributable to zero-coupon securities). These actions may reduce the assets to which the Fund’s expenses could otherwise be allocated and may reduce the Fund’s rate of return.
Industry and Sector Focus Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Industry and Sector Focus Risk. Because the Fund may invest a significant portion of its assets in securities of companies in the banking industry, developments affecting the banking industry may have a disproportionate impact on the Fund. At times the Fund may increase the relative emphasis of its investments in a particular industry or sector. The prices of securities of issuers in a particular industry or sector may be more susceptible to fluctuations due to changes in economic or business conditions, government regulations, availability of basic resources or supplies, contagion risk within a particular industry or sector or to other industries or sectors, or other events that affect that industry or sector more than securities of issuers in other industries and sectors. To the extent that the Fund increases the relative emphasis of its investments in a particular industry or sector, the value of the Fund’s Shares may fluctuate in response to events affecting that industry or sector. These risks generally include interest rate risk, credit risk and risk associated with regulatory changes in the banking industry. The profitability of banks depends largely on the availability and cost of funds, which can change depending on economic conditions.
Investment Company Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Investment Company Risk. The Fund may invest in shares of other investment companies. Shareholders bear both their proportionate share of the Fund’s expenses and similar expenses of the investment company.
Privately Placed Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Privately Placed Securities Risk. Privately placed securities generally are less liquid than publicly traded securities and the Fund may not always be able to sell such securities without experiencing delays in finding buyers or reducing the sale price for such securities. The disposition of some of the securities held by the Fund may be restricted under federal securities laws. As a result, the Fund may not be able to dispose of such investments at a time when, or at a price at which, it desires to do so and may have to bear expenses of registering these securities, if necessary. These securities may also be difficult to value.
Repurchase Agreement Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Repurchase Agreement Risk. Repurchase agreements involve some risk to the Fund that the counterparty does not meet its obligation under the agreement.
Floating and Variable Rate Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Floating and Variable Rate Securities Risk. Floating and variable rate securities provide for a periodic adjustment in the interest rate paid on the securities. The rate adjustment intervals may be regular and range from daily up to annually, or may be based on an event, such as a change in the prime rate. Floating and variable rate securities may be subject to greater liquidity risk than other debt securities, meaning that there may be limitations on the Fund’s ability to sell the securities at any given time. Such securities also may lose value.
Non Money Market Fund Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Non-Money Market Fund Risk. The Fund is not a money market fund. Although the Fund seeks to provide low volatility of principal, the Fund’s NAV and market value will fluctuate every day and these fluctuations may be significant on certain days. Also, the Fund is not subject to the liquidity requirements and investment and credit quality restrictions applicable to money market funds. There can be no guarantee that the Fund will generate higher returns than money market funds. Because the Fund is not a money market fund, it does not qualify for the special money market fund tax treatment or tax accounting methods under Treasury regulations.
ETF Shares Trading Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] ETF Shares Trading Risk. Shares are listed for trading on the NYSE Arca, Inc. (the Exchange) and are bought and sold in the secondary market at market prices. The market prices of Shares are expected to fluctuate, in some cases materially, in response to changes in the Fund’s NAV, the intraday value of the Fund’s holdings and supply and demand for Shares. The adviser cannot predict whether Shares will trade above, below or at their NAV. Disruptions to creations and redemptions, the existence of significant market volatility or potential lack of an active trading market for the Shares (including through a trading halt), as well as other factors, may result in the Shares trading significantly above (at a premium) or below (at a discount) to NAV or to the intraday value of the Fund’s holdings. During such periods, you may incur significant losses if you sell your Shares. The securities held by the Fund may be traded in markets that close at a different time than the Exchange. Liquidity in those securities may be reduced after the applicable closing times. Accordingly, during the time when the Exchange is open but after the applicable market closing, fixing or settlement times, bid-ask spreads on the Exchange and the corresponding premium or discount to the Shares’ NAV may widen.
Authorized Participant Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Authorized Participant Concentration Risk. Only an authorized participant may engage in creation or redemption transactions directly with the Fund. The Fund has a limited number of intermediaries that act as authorized participants and none of these authorized participants is or will be obligated to engage in creation or redemption transactions. The Fund has a limited number of institutions that may act as authorized participants on an agency basis (i.e., on behalf of other market participants). To the extent that these intermediaries exit the business or are unable to or choose not to proceed with creation and/or redemption orders with respect to the Fund and no other authorized participant creates or redeems, Shares may trade at a discount to NAV and possibly face trading halts and/or delisting. Authorized participant concentration risk may be heightened for exchange-traded funds (ETFs) that invest in securities issued by non-U.S. issuers.
Risk Associated with the Fund Holding Cash Money Market Instruments and Other Short Term Investments [Member]  
Prospectus [Line Items]  
Risk [Text Block] Risk Associated with the Fund Holding Cash, Money Market Instruments and Other Short-Term Investments. The Fund will, at times, hold assets in cash, money market instruments and other short-term investments, which may hurt the Fund’s performance. These positions may also subject the Fund to additional risks and costs.
Cash Transactions Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block] Cash Transactions Risk. Unlike certain ETFs, the Fund expects to generally effect its creations and redemptions entirely or partially in cash, rather than primarily for in-kind securities. Therefore, it will be required to sell portfolio securities and subsequently recognize a gain on such sales that the Fund might not have recognized if it were to distribute portfolio securities in kind. As such, investments in Shares may be less tax-efficient than an investment in an ETF that distributes portfolio securities entirely in kind.
Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] You could lose money investing in the Fund.
Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] Investments in the Fund are not deposits or obligations of, or guaranteed or endorsed by, any bank and are not insured or guaranteed by the FDIC, the Federal Reserve Board or any other government agency.