BetaBuilders U.S. Treasury Bond 20+ Year ETF Investment Risks - BetaBuilders U.S. Treasury Bond 20+ Year ETF	Feb. 28, 2026
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 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.
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 Underlying Index or 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.
Index Related Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Index Related Risk. The Fund’s return may not track the return of the Underlying Index for a number of reasons and therefore may not achieve its investment objective. For example, the Fund incurs a number of operating expenses not applicable to the Underlying Index, and incurs costs in buying and selling securities, especially when rebalancing the Fund’s securities holdings to reflect changes in the composition of the Underlying Index. In addition, the Fund’s return may differ from the return of the Underlying Index as a result of, among other things, pricing differences between the valuation of securities in the Underlying Index and in the Fund’s NAV and the inability to purchase certain securities included in the Underlying Index due to regulatory or other restrictions. In addition, because the Fund uses a representative sampling approach, the Fund may not be as well correlated with the return of the Underlying Index as when the Fund purchases all of the securities in the Underlying Index in the proportions in which they are represented in the Underlying Index. Errors in the construction or calculation of the Underlying Index may occur from time to time. Any such errors may not be identified and corrected by the Index Provider for some period of time, which may have an adverse impact on the Fund and its shareholders. The risk that the Fund may not track the performance of the Underlying Index may be heightened during times of increased market volatility or other unusual market conditions.
Passive Management Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Passive Management Risk. Unlike many investment companies, the Fund is not “actively” managed. Therefore, it would not generally sell a security because the security’s issuer was in financial trouble unless that security is removed from the Underlying Index. As a result, the Fund’s performance could be lower than funds that actively shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. The structure and composition of the Underlying Index will affect the performance, volatility, and risk of the Fund. The Fund will not take defensive positions under any market conditions, including in declining markets.
Sampling Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Sampling Risk. To the extent the Fund uses a representative sampling approach, it will hold a smaller number of securities than are in the Underlying Index. As a result, an adverse development respecting an issuer of securities held by the Fund could result in a greater decline in the Fund’s NAV than would be the case if the Fund held all of the securities in the Underlying Index. Conversely, a positive development relating to an issuer of securities in the Underlying Index that is not held by the Fund could cause the Fund to underperform the Underlying Index. To the extent the assets in the Fund are smaller, these risks may be greater.
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.
Geographic Focus Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Geographic Focus Risk. The Fund focuses its investments in the United States. As a result, the Fund’s performance may be subject to greater volatility than a more geographically diversified fund.
Government Securities Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Government Securities Risk. U.S. government securities are subject to market risk, interest rate risk and credit risk. Securities, such as those issued or guaranteed by 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.
ETF Shares Trading Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	ETF Shares Trading Risk. Shares are listed for trading on the Cboe BZX Exchange, 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 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.

BetaBuilders U.S. Treasury Bond 20+ Year ETF Investment Risks - BetaBuilders U.S. Treasury Bond 20+ Year ETF

Feb. 28, 2026

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 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.

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 Underlying Index or 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.

Index Related Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Index Related Risk. The Fund’s return may not track the return of the Underlying Index for a number of reasons and therefore may not achieve its investment objective. For example, the Fund incurs a number of operating expenses not applicable to the Underlying Index, and incurs costs in buying and selling securities, especially when rebalancing the Fund’s securities holdings to reflect changes in the composition of the Underlying Index. In addition, the Fund’s return may differ from the return of the Underlying Index as a result of, among other things, pricing differences between the valuation of securities in the Underlying Index and in the Fund’s NAV and the inability to purchase certain securities included in the Underlying Index due to regulatory or other restrictions. In addition, because the Fund uses a representative sampling approach, the Fund may not be as well correlated with the return of the Underlying Index as when the Fund purchases all of the securities in the Underlying Index in the proportions in which they are represented in the Underlying Index. Errors in the construction or calculation of the Underlying Index may occur from time to time. Any such errors may not be identified and corrected by the Index Provider for some period of time, which may have an adverse impact on the Fund and its shareholders. The risk that the Fund may not track the performance of the Underlying Index may be heightened during times of increased market volatility or other unusual market conditions.

Passive Management Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Passive Management Risk. Unlike many investment companies, the Fund is not “actively” managed. Therefore, it would not generally sell a security because the security’s issuer was in financial trouble unless that security is removed from the Underlying Index. As a result, the Fund’s performance could be lower than funds that actively shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. The structure and composition of the Underlying Index will affect the performance, volatility, and risk of the Fund. The Fund will not take defensive positions under any market conditions, including in declining markets.

Sampling Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Sampling Risk. To the extent the Fund uses a representative sampling approach, it will hold a smaller number of securities than are in the Underlying Index. As a result, an adverse development respecting an issuer of securities held by the Fund could result in a greater decline in the Fund’s NAV than would be the case if the Fund held all of the securities in the Underlying Index. Conversely, a positive development relating to an issuer of securities in the Underlying Index that is not held by the Fund could cause the Fund to underperform the Underlying Index. To the extent the assets in the Fund are smaller, these risks may be greater.

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.

Geographic Focus Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Geographic Focus Risk. The Fund focuses its investments in the United States. As a result, the Fund’s performance may be subject to greater volatility than a more geographically diversified fund.

Government Securities Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Government Securities Risk. U.S. government securities are subject to market risk, interest rate risk and credit risk. Securities, such as those issued or guaranteed by 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.

ETF Shares Trading Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

ETF Shares Trading Risk. Shares are listed for trading on the Cboe BZX Exchange, 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 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.