Objective, Primary [Text Block]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

American Customer Satisfaction ETF

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

rr_ObjectivePrimaryTextBlock

The American Customer Satisfaction ETF (“ACSI ETF” or the “Fund”) seeks to track the performance, before fees and expenses, of the American Customer Satisfaction Investable Index (the “Index”).

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy, hold, and sell shares of the Fund (“Shares”). This table and the Example below do not include the brokerage commissions and other fees to financial intermediaries that investors may pay on their purchases and sales of Shares.

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 buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. For the fiscal year ended September 30, 2020, the portfolio turnover rate for the Predecessor Fund (defined below) was 67% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

67.00%

Expense Exchange Traded Fund Commissions [Text]

rr_ExpenseExchangeTradedFundCommissions

This table and the Example below do not include the brokerage commissions and other fees to financial intermediaries that investors may pay on their purchases and sales of Shares.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Financial Highlights section of the Prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

Expense Example [Heading]

rr_ExpenseExampleHeading

Expense 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. 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% return each year and that the Fund’s operating expenses remain the same. The Example does not take into account brokerage commissions that you may pay on your purchases and sales of Shares.

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund uses a “passive management” (or indexing) approach to track the performance, before fees and expenses, of the Index. The Index is based on a proprietary methodology created and maintained by CSat Investment Advisory, L.P., doing business as Exponential ETFs (“Exponential ETFs”), the Fund’s index provider and the investment adviser for the Predecessor Fund (defined below), in partnership with the American Customer Satisfaction Index, LLC, an affiliate of Exponential ETFs and owner/publisher of the leading national cross-industry measure of customer satisfaction (the “Customer Satisfaction Data”). Calculation of the Customer Satisfaction Data incorporates surveys of more than 100,000 household customers each year to identify trends in customer satisfaction and provide benchmarking insights for companies, industry trade associations, and government agencies.

American Customer Satisfaction Investable Index

The Index uses an objective, rules-based methodology to measure the performance of U.S.-listed companies whose customers have been surveyed and who have been assigned a customer satisfaction score as part of the Customer Satisfaction Data (collectively, “ACSI Companies”).

Construction of the Index begins with over 400 ACSI Companies across 46 industries and 10 economic sectors. The initial universe is then screened to eliminate companies whose stock is not principally listed on a U.S. exchange, whose market capitalization is less than $1 billion, or for which the Customer Satisfaction Data is statistically insignificant. The Index is comprised of ACSI Companies in the 25 industries (as classified by the Customer Satisfaction Data) with the highest customer retention, and the company(ies) with the highest ACSI Score (described below) in each such industry will be included in the Index (the “Index Companies”). One to three ACSI Companies from each industry are included in the Index based on the number of ACSI Companies in a given industry. The Index will generally be comprised of 25 to 35 companies at the time of each rebalance of the Index.

A company’s ACSI Score is calculated by utilizing a proprietary model to evaluate customers’ Customer Satisfaction Data based on questions that measure the following facets of satisfaction with a product or service:


Customer Expectations			Customer expectations is a measure of the customer’s anticipation of the quality of a company’s products or services. Expectations represent both prior consumption experience, which includes some nonexperiential information like advertising and word-of-mouth, and a forecast of the company’s ability to deliver quality in the future.
Perceived Quality			Perceived quality is a measure of the customer’s evaluation via recent consumption experience of the quality of a company’s products or services. Quality is measured in terms of both customization, which is the degree to which a product or service meets the customer’s individual needs, and reliability, which is the frequency with which things go wrong with the product or service.
Perceived Value			Perceived value is a measure of quality relative to price paid. Although price (value for money) is often very important to the customer’s first purchase, it usually has a somewhat smaller impact on satisfaction for repeat purchases.

At the time of each rebalance of the Index, the Index is sector-weighted to reflect the overall U.S. large cap market, industry-weighted based on the highest ACSI Score of any Index Company within an industry, and equal-weighted within each industry, subject to the constraints described below.

Sector Weighting. At the time of each rebalance of the Index, the Index weight is allocated to each economic sector based on the aggregate number of the Index Companies in each sector relative to that of each other sector, provided that such weights will be adjusted upward or downward if necessary to better reflect the weight of such sector in the overall U.S. large cap market. Unallocated Index weight resulting from such downward adjustments is re-allocated first equally to sectors requiring an upward weight adjustment and then equally to all sectors to the extent they stay within the Index’s constraints.

Industry Weighting. At the time of each rebalance of the Index, within each economic sector, the Index weight is allocated to each industry based on the highest ACSI Score of any Index Company within such industry relative to the highest ACSI Score for companies in each other industry within such sector.

Security Weighting. At the time of each rebalance of the Index, Index Companies within an industry are equally weighted, subject to a maximum of 12% for any individual Index Company.

The Index is rebalanced and reconstituted on a quarterly basis after market close on the 10th trading day of each January, April, July, and October. The data used to compute each ACSI Company’s score is updated based on the Customer Satisfaction Data on a rolling basis, no less often than quarterly, with new data replacing earlier data collected in the same period of the previous year.

The Index was created by Exponential ETFs in 2016 in anticipation of the commencement of operations of the Predecessor Fund. Exponential ETFs is not affiliated with the Fund’s investment adviser.

The Fund’s Investment Strategy

The Fund will generally use a “replication” strategy to achieve its investment objective, meaning it generally will invest in all of the component securities of the Index. However, the Fund may use a “representative sampling” strategy, meaning it may invest in a sample of the securities in the Index whose risk, return and other characteristics closely resemble the risk, return and other characteristics of the Index as a whole, when Toroso Investments, LLC (“Toroso” or the “Adviser”) believes it is in the best interests of the Fund (e.g., when replicating the Index involves practical difficulties or substantial costs, an Index constituent becomes temporarily illiquid, unavailable, or less liquid, or as a result of legal restrictions or limitations that apply to the Fund but not to the Index).

Under normal circumstances, at least 80% of the Fund’s net assets, plus borrowings for investment purposes, will be invested in investments that are tied economically to the United States. Such policy has been adopted as a non-fundamental investment policy and may be changed without shareholder approval upon approval by the Board of Trustees (the “Board”) of Tidal ETF Trust (the “Trust”) and 60 days’ written notice to shareholders.

The Fund may invest in securities or other investments not included in the Index (such as other exchange-traded funds (“ETFs”)), but which the Adviser believes will help the Fund track the Index. For example, the Fund may invest in securities that are not components of the Index to reflect various corporate actions and other changes to the Index (such as reconstitutions, additions, and deletions).

To the extent the Index concentrates (i.e., holds more than 25% of its total assets) in the securities of a particular industry or group of related industries, the Fund will concentrate its investments to approximately the same extent as the Index.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

The principal risks of investing in the Fund are summarized below. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with those of other funds. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears. As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. Some or all of these risks may adversely affect the Fund’s net asset value per share (“NAV”), trading price, yield, total return and/or ability to meet its objectives. For more information about the risks of investing in the Fund, see the section in the Fund’s Prospectus titled “Additional Information About the Fund’s Principal Risks.”

•Cybersecurity Risk. With the increased use of technologies such as the Internet to conduct business, the Fund is susceptible to operational, information security, and related risks. Cyber incidents affecting the Fund or its service providers may cause disruptions and impact business operations, potentially resulting in financial losses, interference with the Fund’s ability to calculate its NAV, impediments to trading, the inability of shareholders to transact business, violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, or additional compliance costs.

•Equity Market Risk. The equity securities held in the Fund’s portfolio may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific issuers, industries, or sectors in which the Fund invests. Common stocks are generally exposed to greater risk than other types of securities, such as preferred stock and debt obligations, because common stockholders generally have inferior rights to receive payment from issuers. In addition, local, regional or global events such as war, acts of terrorism, spread of infectious diseases or other public health issues, recessions, or other events could have a significant negative impact on the Fund and its investments. For example, the global pandemic caused by COVID-19, a novel coronavirus, 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, has had negative impacts, and in many cases severe impacts, on markets worldwide. The COVID-19 pandemic has caused prolonged disruptions to the normal business operations of companies around the world and the impact of such disruptions is hard to predict. Such events may affect certain geographic regions, countries, sectors and industries more significantly than others. Such events could adversely affect the prices and liquidity of the Fund’s portfolio securities or other instruments and could result in disruptions in the trading markets.

•ETF Risks. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks:

◦Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“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.

◦Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid-ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments.

◦Shares May Trade at Prices Other Than NAV. 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. 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.

◦Trading. Although Shares are listed for trading on Cboe BZX Exchange, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares.

•Models and Data Risk. The composition of the Index is heavily dependent on proprietary quantitative models as well as information and data supplied by third parties (“Models and Data”). When Models and Data prove to be incorrect or incomplete, any decisions made in reliance thereon may lead to securities being included in or excluded from the Index that would have been excluded or included had the Models and Data been correct and complete. If the composition of the Index reflects such errors, the Fund’s portfolio can be expected to reflect the errors, too.

•Passive Investment Risk. The Fund invests in the securities included in, or representative of, the Index regardless of their investment merit. The Fund does not attempt to outperform the Index or take defensive positions in declining markets. As a result, the Fund’s performance may be adversely affected by a general decline in the market segments relating to the Index.

•Sector Risk. To the extent the Fund invests more heavily in particular sectors of the economy, its performance will be especially sensitive to developments that significantly affect those sectors.

◦Consumer Discretionary Sector Risk. The Fund is generally expected to invest significantly in companies in the consumer discretionary sector, and therefore the performance of the Fund could be negatively impacted by events affecting this sector. The success of consumer product manufacturers and retailers is tied closely to the performance of domestic and international economies, interest rates, exchange rates, competition, consumer confidence, changes in demographics and consumer preferences. Companies in the consumer discretionary sector depend heavily on disposable household income and consumer spending, and may be strongly affected by social trends and marketing campaigns. These companies may be subject to severe competition, which may have an adverse impact on their profitability.

◦Consumer Staples Sector Risk. The Fund may invest in companies in the consumer staples sector, and therefore the performance of the Fund could be negatively impacted by events affecting this sector. Companies in the consumer staples sector, including those in the food and beverage industries, may be affected by general economic conditions, commodity production and pricing, consumer confidence and spending, consumer preferences, interest rates, product cycles, marketing campaigns, competition, and government regulations.

◦Information Technology Sector Risk. Market or economic factors impacting information technology companies and companies that rely heavily on technological advances could have a significant effect on the value of the Fund’s investments. The value of stocks of information technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. As of September 30, 2020, 26.7% of the Predecessor Fund’s net assets were invested in the information technology sector.

•Tracking Error Risk. As with all index funds, the performance of the Fund and the Index may differ from each other for a variety of reasons. For example, the Fund incurs operating expenses and portfolio transaction costs not incurred by the Index. In addition, the Fund may not be fully invested in the securities of the Index at all times or may hold securities not included in the Index.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

Prior to the commencement of the Fund’s operations on May 24, 2021, the Fund operated as the American Customer Satisfaction ETF (the “Predecessor Fund”), a series of the ETF Series Solutions, an open-end investment company registered under the Investment Company Act of 1940, as amended (the “1940 Act”), that had the same investment objective and strategies as the Fund since the Predecessor Fund’s inception. The Fund assumed the NAV and performance history of the Predecessor Fund. Performance shown in the bar chart and table for periods prior to May 24, 2021 is that of the Predecessor Fund and is not the performance of the Fund. The Predecessor Fund was reorganized into the Fund at the inception of the Fund.

The following performance information provides some indication of the risks of investing in the Fund by showing two aspects of the Fund: volatility and performance. The bar chart and table reflect changes in the Predecessor Fund’s performance from year to year over the periods indicated and show how the Predecessor Fund’s average annual total returns for the periods indicated compare to those of a relevant market index and the Index. The Predecessor Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. Updated performance information is also available on the Fund’s website at www.acsietf.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following performance information provides some indication of the risks of investing in the Fund by showing two aspects of the Fund: volatility and performance.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.acsietf.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The Predecessor Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

The Predecessor Fund’s calendar year-to-date return as of March 31, 2021 was 6.82%.

During the period of time shown in the bar chart, the Predecessor Fund’s highest quarterly return was 20.34% for the quarter ended June 30, 2020, and the lowest quarterly return was -21.62% for the quarter ended March 31, 2020.

Year to Date Return, Label

rr_YearToDateReturnLabel

year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2021

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

6.82%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest quarterly return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

20.34%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest quarterly return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2020

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.62%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the Periods Ended December 31, 2020

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses, or taxes)

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.

American Customer Satisfaction ETF | American Customer Satisfaction Investable Index (reflects no deduction for fees, expenses, or taxes)

rr_ProspectusLineItems

rr_AverageAnnualReturnLabel

American Customer Satisfaction Investable Index(reflects no deduction for fees, expenses, or taxes)

rr_AverageAnnualReturnYear01

23.60%

American Customer Satisfaction ETF | Standard & Poor’s 500 (S&P 500 Index) (reflects no deduction for fees, expenses, or taxes)

rr_AverageAnnualReturnSinceInception

16.40%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2016

^[1]

rr_ProspectusLineItems

rr_AverageAnnualReturnLabel

Standard & Poor’s 500 (S&P 500 Index)(reflects no deduction for fees, expenses, or taxes)

rr_AverageAnnualReturnYear01

18.40%

American Customer Satisfaction ETF | American Customer Satisfaction ETF

rr_AverageAnnualReturnSinceInception

16.91%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2016

^[1]

Management Fees (as a percentage of Assets)

rr_ProspectusLineItems

Trading Symbol

dei_TradingSymbol

ACSI

rr_ManagementFeesOverAssets

0.65%

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

0.01%

^[2]

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.66%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 67

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

211

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

368

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 822

Annual Return 2017

rr_AnnualReturn2017

15.49%

Annual Return 2018

rr_AnnualReturn2018

(4.40%)

Annual Return 2019

rr_AnnualReturn2019

24.47%

Annual Return 2020

rr_AnnualReturn2020

22.84%

rr_AverageAnnualReturnLabel

Return Before Taxes

rr_AverageAnnualReturnYear01

22.84%

American Customer Satisfaction ETF | American Customer Satisfaction ETF | After Taxes on Distributions

rr_AverageAnnualReturnSinceInception

15.54%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2016

^[1]

rr_ProspectusLineItems

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

rr_AverageAnnualReturnYear01

22.61%

American Customer Satisfaction ETF | American Customer Satisfaction ETF | After Taxes on Distributions and Sales

rr_AverageAnnualReturnSinceInception

15.17%

rr_ProspectusLineItems

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

rr_AverageAnnualReturnYear01

13.69%