v3.22.4
Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Sep. 30, 2022
Entity Registrant Name dei_EntityRegistrantName BUILD FUNDS TRUST
Entity Central Index Key dei_EntityCentralIndexKey 0001875710
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jan. 27, 2023
Document Effective Date dei_DocumentEffectiveDate Jan. 27, 2023
Prospectus Date rr_ProspectusDate Jan. 27, 2023
Build Bond Innovation ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Summary Information — Build Bond Innovation ETF
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Build Bond Innovation ETF (the “Fund”) seeks capital appreciation and risk mitigation.

 

Expense [Heading] rr_ExpenseHeading Fund Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you pay if you buy, hold, and sell shares of the Fund (“Shares”). Future expenses may be greater or less. You may be required to pay brokerage commissions on purchases and sales of Shares, which are not reflected in the table or the example below. Please contact your financial intermediary about whether such a commission may apply to your transaction.

 

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment) None
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it purchases and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may result in higher transaction costs and higher taxes when Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses table or in the Example above, may affect the Fund’s performance. For the period from February 10, 2022 (commencement of operations) through September 30, 2022, the Fund had a portfolio turnover rate of 328%.

 

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 328.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The operating expenses in this fee table will not correlate to the expense ratio in the Fund’s financial highlights because the financial statements include only the direct operating expenses incurred by the Fund.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. This example does not take into account brokerage commissions that you pay when purchasing or selling Shares.

 

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% annual return and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

 

Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund is an actively managed exchange-traded fund (“ETF”) that seeks to achieve its investment objective through investing in a non-diversified portfolio of U.S. dollar-denominated, investment-grade bonds of U.S. and non-U.S. issuers either directly or indirectly via unaffiliated ETFs (“Underlying Funds”), (the “Fixed Income Strategy”) and long call or long put options linked to the performance of an equity, ETF, or index (collectively, the “Reference Asset”), (the “Equity Option Overlay Strategy”).

 

 

Under normal market conditions, the Fund invests 80% or more of its assets (defined as net assets plus any borrowing for investment purposes, if any) in bond instruments (“80% investment policy”), directly or by investing in Underlying Funds which invest primarily in bond instrument securities. The Fund defines bond instruments to include: (i) bonds, (ii) bills, (iii) notes, (iv) debentures, (v) mortgage-backed securities (“MBS”), (vi) consumer asset-backed securities (“ABS”), such as credit card and auto loan receivables, (vii) commercial mortgage-backed securities (“CMBS”) (viii) or any other debt or debt-related securities of any maturities, whether issued by U.S. or non-U.S. governments, agencies or instrumentalities thereof or corporate entities, and having fixed, variable, floating or inverse floating rates.

 

The Fund seeks to achieve its capital appreciation objective via two sources: (1) total return on the Fixed Income Strategy, and (2) total return on the Equity Option Overlay Strategy. The Fund seeks to achieve its risk mitigation objective by: (1) maintaining a moderate duration, investment grade (BBB-equivalent or better) average credit quality risk profile of its holdings in the Fixed Income Strategy, and (2) maintaining the Fund’s allocation to the Equity Option Overlay Strategy to between 0% and 10% of its holdings.

 

Fixed Income Strategy

 

The Fixed Income Strategy invests in U.S. dollar denominated fixed income instruments of investment grade quality - i.e., recognized as BBB- or higher by at least one Nationally Recognized Statistical Rating Organizations (NRSRO) (e.g., Standard & Poor’s, Moody’s, or Fitch), directly or by investing in Underlying Funds which invest primarily in bonds and bond instrument securities.

 

The Fund’s adviser considers potential bond instrument investments, or investment in an Underlying Fund by evaluating credit quality, nominal yield and spread. With respect to credit quality, the adviser utilizes its own research, as well as third-party investment research, ratings, and analyses provided by credit ratings agencies (e.g., Moody’s, Standard & Poor’s and Fitch) and other investment research publishers.

 

In forming a portfolio of holdings that make up the Fixed Income Strategy, the adviser selects a portfolio of securities it believes best maximizes the Fund’s expected total return potential while maintaining a risk profile consistent with a moderate duration and investment grade average credit quality. In analyzing individual securities for inclusion or removal from the Fixed Income Strategy’s holdings, the adviser evaluates individual fixed income securities or Underlying Funds on a relative value basis in a manner that the adviser believes to be most consistent with the Fund’s stated objectives. Under normal circumstances, the Fund will maintain an investment portfolio with a weighted average duration of no less than 1 year and no more than 8 years. The Fund anticipates an average maturity of holdings in the Fixed Income Strategy of no less than 1 year and no more than 10 years, with no constraint on maturity for any individual fixed income security.

 

Equity Option Overlay Strategy

 

Under normal market circumstances, the Fund uses call and put option strategies to seek to obtain total return within the desired risk profile. The Fund ordinarily will implement call or put option strategies on the Reference Asset. Call options give the Fund the right but not the obligation to buy the Reference Asset at a specified price (the “strike price”) within a specific time period. Put options give the Fund the right but not the obligation to sell the Reference Asset at a specified price (the “strike price”) within a specific time period. The Fund pays a fee to purchase a call or put option, which is called the premium. In return for the payment of the premium, the Fund is entitled to purchase (sell) the Reference Asset from the writer of the call (put) option at a value equal to the difference between the market price of the Reference Asset and the exercise price of the option, if the value of the call (put) option is above (below) its exercise price. When the call (put) option expires and the Fund has not exercised the call option because the value of the call (put) option is below (above) its exercise price, the Fund loses the premium paid. The Fund may sell call or put options but only to close out an existing call option the Fund owns (“sell to close”).

 

Pursuant to the Fund’s option strategy, the Fund invests in a series of call or put options on the Reference Asset. The Adviser selects an option based upon its evaluation of the option’s cost, strike price, expiration and price sensitivity to the Reference Asset. The Adviser may purchase an option on the Reference Asset that has a strike price above, at or below the price of the Reference Asset. Through the purchases of a series of call options, the Adviser is seeking total return for the Fund to the extent the price of the Reference Asset rises less the premium paid by the Fund for the call options. When the price of the Reference Asset declines and the call options go unexercised, the Fund’s total return declines as the return is reduced by the premium the Fund paid for the call option. Through the purchases of a series of put options, the Adviser is seeking total return for the Fund to the extent the price of the Reference Asset decreases less the premium paid by the Fund for the put options. When the price of the Reference Asset rises and the put options go unexercised, the Fund’s total return declines as the return is reduced by the premium the Fund paid for the put option.

 

The adviser employs a risk management process to mitigate the risks associated with the option strategy. In addition, under normal market conditions, no more than 10% of the value of the Fund’s net assets will be subject to the Fund’s option strategy and no more than 2.5% of the Fund’s net assets will be subject to any single option. In addition, the Adviser considers the impact of transaction costs associated with implementing the Fund’s option strategy, including whether the potential benefits achieved in rising markets exceeds the negative impact of transaction costs associated with purchasing call or put options. Under conditions of extreme stress or volatility in broader financial markets, including those in the Reference Asset, the Fund will incur increased transaction costs.

 

Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

There is no assurance that the Fund will meet its investment objective. The value of your investment in the Fund, as well as the amount of return you receive on your investment in the Fund, may fluctuate significantly. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. Therefore, you should consider carefully the following risks before investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the FDIC or any government agency.

 

Fixed Income Risk. When the Fund invests in fixed income securities, the value of your investment in the Fund will fluctuate with changes in interest rates. Typically, a rise in interest rates causes a decline in the value of fixed income securities owned by the Fund. In general, the market price of fixed income securities with longer maturities will increase or decrease more in response to changes in interest rates than shorter-term securities. Other risk factors include credit risk (the debtor may default), extension risk (an issuer may exercise its right to repay principal on a fixed rate obligation held by the Fund later than expected), and prepayment risk (the debtor may pay its obligation early, reducing the amount of interest payments). These risks could affect the value of a particular investment by the Fund, possibly causing the Fund’s share price and total return to be reduced and fluctuate more than other types of investments.

 

Options Risk. An option is an agreement that, for a premium payment or fee, gives the option holder (the purchaser) the right but not the obligation to buy (a “call option”) or sell (a “put option”) the underlying asset (or settle for cash in an amount based on an underlying asset, rate, or index) at a specified price (the “exercise price”) during a period of time or on a specified date. Investments in options are considered speculative. When the Fund purchases a call option, it may lose the total premium paid for it if the price of the underlying security or other assets decreased, remained the same or failed to increase to a level at or beyond the exercise price. When the Fund purchases a put option, it may lose the total premium paid for it if the price of the underlying security or other assets increased, remained the same or failed to decrease to a level at or below the exercise price. If an option purchased by the Fund were permitted to expire without being sold or exercised, its premium would represent a loss to the Fund.

 

Absence of Prior Active Market Risk. While the Fund’s Shares are listed on the Fund’s listing exchange, there can be no assurance that active trading markets for the Shares will be maintained. Further, secondary markets may be subject to irregular trading activity, wide bid/ask spreads and extended trade settlement periods in times of market stress because market makers and APs may step away from making a market in the Shares and in executing creation and redemption orders, which could cause a material deviation in the Fund’s market price from its NAV. As a result, investors in the Fund may pay significantly more or receive significantly less for Fund shares than the value of the Fund’s underlying securities or the NAV of Fund shares.

 

Active Management Risk. The Fund is actively managed, which means that investment decisions are made based on the Adviser’s investment views. There is no guarantee that the Adviser’s investment views will produce the desired results or expected returns, which may cause the Fund to fail to meet its investment objective or to underperform its benchmark index or funds with similar investment objectives and strategies. Furthermore, active trading that can accompany active management may result in high portfolio turnover, which may have a negative impact on performance. Active trading may result in higher brokerage costs or mark-up charges, which are ultimately passed on to shareholders of the Fund. Active trading may also result in adverse tax consequences.

 

Asset-Backed Securities Risk. Asset-backed securities are bonds or notes backed by a discrete pool of financial assets such as credit card receivables, automobile receivables and student loans. The impairment of the value of the financial assets underlying an asset-backed security, such as the non-payment of loans, may result in a reduction in the value of such asset-backed security. Certain asset-backed securities do not have the benefit of the same security interest in the underlying financial assets as do mortgage-backed securities, nor are they provided government guarantees of repayment. Accordingly, issuers of asset-backed securities may have limited ability to enforce the security interest in the underlying assets, and credit enhancements provided to support the asset-backed securities, if any, may be inadequate to protect investors in the event of default.

 

Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as authorized participants (“Authorized Participants” or “APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

Call Risk. The risk that an issuer may exercise its right to redeem a fixed income security earlier than expected (a call). Issuers may call outstanding securities prior to their maturity for a number of reasons (e.g., declining interest rates, changes in credit spreads and improvements in the issuer’s credit quality). If an issuer calls a security that the Fund has invested in, the Fund may not recoup the full amount of its initial investment and may be forced to reinvest in lower-yielding securities, securities with greater credit risks or securities with other, less favorable characteristics.

 

Credit Risk. The risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to a derivative contract, is unable or unwilling, or is perceived (whether by market participants, rating agencies, pricing services or otherwise) as unable or unwilling, to meet its financial obligations.

 

 

Derivatives Risk. The Fund may invest in certain types of derivatives contracts, including options, which can be more sensitive to changes in interest rates or to sudden fluctuations in market prices than conventional securities, which can result in greater losses to the Fund.

 

Early Close/Trading Halt Risk: An exchange or market may close or impose a market trading halt or issue trading halts on specific securities, or the ability to buy or sell certain securities or financial instruments may be restricted, which may prevent the Fund from buying or selling certain securities or financial instruments. In these circumstances, the Fund may be unable to rebalance its portfolio, may be unable to accurately price its investments and may incur substantial trading losses.

 

ETF Structure Risk. The Fund is structured as an ETF and as a result is subject to the special risks, including:

 

Not Individually Redeemable. Shares are not individually redeemable and may be redeemed by the Fund at NAV only in large blocks known as “Creation Units.” You may incur brokerage costs purchasing enough Shares to constitute a Creation Unit.

 

Trading Issues. An active trading market for the Fund’s shares may not be developed or maintained. Trading in Shares on NYSE Arca, Inc. (the “Exchange”) may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in Shares inadvisable, such as extraordinary market volatility. There can be no assurance that Shares will continue to meet the listing requirements of the Exchange. If the Fund’s shares are traded outside a collateralized settlement system, the number of financial institutions that can act as Authorized Participants that can post collateral on an agency basis is limited, which may limit the market for the Fund’s shares.

 

Market Price Variance Risk. The market prices of Shares will fluctuate in response to changes in NAV and supply and demand for Shares and will include a “bid-ask spread” charged by the exchange specialists, market makers or other participants that trade the particular security. There may be times when the market price and the NAV vary significantly. This means that Shares may trade at a discount to NAV.

 

In times of market stress, market makers may step away from their role market making in the Shares of ETFs and in executing trades, which can lead to differences between the market value of Shares and an ETF’s NAV.

 

The market price of the Shares may deviate from an ETF’s NAV, particularly during times of market stress, with the result that investors may pay significantly more or significantly less for Shares than an ETF’s NAV, which is reflected in the bid and ask price for Shares or in the closing price.

 

When all or a portion of an ETFs underlying securities trade in a market that is closed when the market for the Shares is open, there may be changes from the last quote of the closed market and the quote from an ETF’s domestic trading day, which could lead to differences between the market value of the Shares and an ETF’s NAV.

 

In stressed market conditions, the market for the Shares may become less liquid in response to the deteriorating liquidity of an ETF’s portfolio. This adverse effect on the liquidity of the Shares may, in turn, lead to differences between the market value of the Shares and an ETF’s NAV.

 

Extension Risk. During periods of rising interest rates, certain debt obligations may be paid off substantially more slowly than originally anticipated and the value of those securities may fall sharply, resulting in a decline in the Fund’s income and potentially in the value of the Fund’s investments.

 

Interest Rate Risk. The risk that fixed income securities will decline in value because of an increase in interest rates; a fund with a longer average portfolio duration will be more sensitive to changes than a fund with a shorter average portfolio duration.

 

Investing in the Underlying Funds Risk. The investments of the Fund in Underlying Funds are subject to statutory limitations prescribed by the Investment Company Act of 1940, as amended (the “Investment Company Act”), or exemptive relief or regulations thereunder. The Fund’s investment performance is directly related to the investment performance of the Underlying Funds it holds. The Fund is subject to the risk factors associated with the investments of the Underlying ETFs and will be affected by the investment policies and practices of the Underlying Funds in direct proportion to the amount of assets allocated to each. A strategy used by the Underlying Funds may fail to produce the intended results. If the Fund has a large portion of its portfolio in a single Underlying Fund, it may be more susceptible to adverse developments affecting that Underlying Fund, and may be more susceptible to losses because of these developments. The Underlying Funds are subject to investment advisory and other expenses, which will be indirectly paid by the Fund. As a result, the cost of investing in the Fund will be higher than the cost of investing directly in the Underlying Funds and may be higher than other funds that invest directly in stocks and bonds. Each of the Underlying Funds is subject to its own specific risks, but the Adviser expects the principal investments risks of such Underlying Funds will be similar to the risks of investing in the Fund.

 

Issuer Risk. Changes in the financial condition or credit rating of an issuer or counterparty, changes in specific economic or political conditions that affect a particular type of security or issuer, and changes in general economic or political conditions can affect a security’s or instrument’s value. The values of securities of smaller, less well-known issuers can be more volatile than those of larger issuers. Issuer-specific events can have a negative impact on the value of the Fund.

 

 

LIBOR Transition Risk. The risk related to the anticipated discontinuation of the London Interbank Offered Rate (“LIBOR”). Certain instruments held by the Fund rely in some fashion upon LIBOR. Although the transition process away from LIBOR has become increasingly well-defined in advance of the anticipated discontinuation date, there remains uncertainty regarding the nature of any replacement rate, and any potential effects of the transition away from LIBOR on the Fund or on certain instruments in which the Fund invests can be difficult to ascertain. The transition process may involve, among other things, increased volatility or illiquidity in markets for instruments that currently rely on LIBOR and may result in a reduction in value of certain instruments held by the Fund.

 

Limited History of Operations Risk. The Fund has a limited history of operations for investors to evaluate.

 

Liquidation Risk. If a Fund does not grow to a size to permit it to be economically viable, the Fund may cease operations. In such an event, shareholders may be required to liquidate or transfer their Fund shares at an inopportune time and shareholders may lose money and/or be taxed on their investment. In stressed market conditions, the market for the Fund’s shares may become less liquid in response to deteriorating liquidity in the markets for the Fund’s underlying portfolio holdings. This adverse effect on liquidity for the Fund’s shares in turn could lead to differences between the market price of the Fund’s shares and the underlying value of those shares.

 

Market and Geopolitical Risk:  The increasing interconnectivity between global economies and financial markets increases the likelihood that events or conditions in one region or financial market may adversely impact issuers in a different country, region or financial market. Securities in the Fund’s portfolio may underperform due to inflation (or expectations for inflation), interest rates, global demand for particular products or resources, natural disasters, climate change and climate-related events, pandemics, epidemics, war, terrorism, regulatory events, governmental or quasi-governmental actions, and public health emergencies. The occurrence of global events similar to those in recent years may result in market volatility and may have long term effects on both the U.S. financial market. The current novel coronavirus (COVID-19) global pandemic and the aggressive responses taken by many governments, including closing borders, restricting international and domestic travel, and the imposition of prolonged quarantines or similar restrictions, as well as the forced or voluntary closure of, or operational changes to, many retail and other businesses, has had negative impacts, and in many cases severe negative impacts, on the U.S. financial market. It is not known how long such impacts, or any future impacts of other significant events described above, will or would last, but there could be a prolonged period of global economic slowdown, which may impact your Fund investment.

 

Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for the Shares, losses from trading in secondary markets, and disruption in the creation/redemption process of the Fund. Any of these factors may lead to the Shares trading at a premium or discount to the Fund’s net asset value (“NAV”).

 

Mitigating Risk. When a derivative such as options is used as a hedge against a position that the Fund holds, any loss generated by the derivative generally should be substantially offset by gains on the hedged investment, and vice versa. While mitigating risk through hedging can reduce or eliminate losses, it can also reduce or eliminate gains. Hedges are sometimes subject to imperfect matching between the derivative and the underlying security, and there can be no assurance that the Fund’s hedging transactions, which entail additional transaction costs, will be effective.

 

Mortgage-Backed Security Risk. The Fund invests in mortgage-backed securities (“MBS”), which are securities backed by pools of mortgages issued or guaranteed by the U.S. government or one of its agencies or sponsored entities, including Fannie Mae, Ginnie Mae or Freddie Mac. While securities guaranteed by Ginnie Mae are backed by the full faith and credit of the U.S. government, securities issued by Fannie Mae and Freddie Mac are not backed by the full faith and credit of the U.S. government, and there can be no assurance that the U.S. government would provide financial support to its agencies or sponsored entities where it is not obligated to do so. The Fund may also invest in commercial mortgage-backed securities (“CMBS”) include securities that reflect an interest in, and are secured by, mortgage loans on commercial real property. CMBS may be less liquid and exhibit greater price volatility than other types of mortgage- or asset-backed securities. When the Fund invests in MBS or CMBS, the Fund is subject to the risk that, if the underlying borrowers fail to pay interest or repay principal, the assets backing these securities may not be sufficient to support payments on the securities.

 

Non-Diversification Risk. The Fund’s portfolio may focus on a limited number of investments and will be subject to potential for volatility than a diversified fund.

 

 

Pandemics Risk. An outbreak of infectious respiratory illness caused by the novel coronavirus known as COVID-19 was first detected in China in December 2019 before spreading worldwide and being declared a global pandemic by the World Health Organization in March 2020. COVID-19 has resulted in travel restrictions, closed international borders, enhanced health screenings, disruption and delays in healthcare services, prolonged quarantines, cancellations, temporary store closures, social distancing, government ordered curfews and business closures, disruptions to supply chains and consumer activity, shortages, highly volatile financial markets, and general concern and uncertainty.

 

Portfolio Turnover Risk. Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities, which may negatively affect the Fund’s performance.

 

Shares May Trade at Prices Other Than NAV Risk. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. As a result, investors may pay significantly more or significantly less for Shares than the Fund’s NAV, which is reflected in the bid and ask price for Shares or in the closing price. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant.

 

U.S. Government Obligations Risk. U.S. Treasury obligations are backed by the “full faith and credit” of the U.S. government and generally have negligible credit risk. Securities issued or guaranteed by federal agencies or authorities and U.S. government-sponsored instrumentalities or enterprises may or may not be backed by the full faith and credit of the U.S. government. The Fund may be subject to such risk to the extent it invests in securities issued or guaranteed by federal agencies or authorities and U.S. government-sponsored instrumentalities or enterprises.

 

Risk Lose Money [Text] rr_RiskLoseMoney You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.
RIsk Not Insured [Text] rr_RiskNotInsured An investment in the Fund is not a bank deposit and is not insured or guaranteed by the FDIC or any government agency.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus The Fund’s portfolio may focus on a limited number of investments and will be subject to potential for volatility than a diversified fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The Fund has not yet completed a calendar year of operations and therefore no performance information is presented for the Fund at this time. In the future, performance information will be presented in this section of this Prospectus. Also, shareholder reports containing financial and performance information will be mailed to shareholders semi-annually. Updated performance information will be available at no cost by visiting the Fund’s website at www.getbuilding.com/ETFs.

 

Performance One Year or Less [Text] rr_PerformanceOneYearOrLess The Fund has not yet completed a calendar year of operations and therefore no performance information is presented for the Fund at this time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.getbuilding.com/ETFs
Build Bond Innovation ETF | Build Bond Innovation ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol BFIX
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.45%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets none
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03% [1]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.48%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 154
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 269
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 604
[1] Acquired Fund Fees and Expenses are the average indirect costs of investing in other investment companies. The operating expenses in this fee table will not correlate to the expense ratio in the Fund’s financial highlights because the financial statements include only the direct operating expenses incurred by the Fund.