| Label | Element | Value |
|---|---|---|
| MFS Active Value ETF | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk/Return [Heading] | oef_RiskReturnHeading | MFS® Active Value ETF Summary of Key Information |
| Objective [Heading] | oef_ObjectiveHeading | Investment Objective |
| Objective, Primary [Text Block] | oef_ObjectivePrimaryTextBlock | The fund’s investment objective is to seek capital appreciation. |
| Expense Heading [Optional Text] | oef_ExpenseHeading | Fees and Expenses |
| Expense Narrative [Text Block] | oef_ExpenseNarrativeTextBlock | This table describes the fees and expenses that you may pay when you buy, hold, and sell shares of the fund. Investors may also pay commissions or other fees to their financial intermediaries when they buy, hold, and sell shares of the fund, which are not reflected below. |
| Shareholder Fees Caption [Optional Text] | oef_ShareholderFeesCaption | Shareholder Fees (fees paid directly from your investment): |
| Operating Expenses Caption [Optional Text] | oef_OperatingExpensesCaption | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment): |
| Portfolio Turnover [Heading] | oef_PortfolioTurnoverHeading | Portfolio Turnover |
| Portfolio Turnover [Text Block] | oef_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 transaction costs, which are not reflected in “Annual Fund Operating Expenses” or in the “Example,” affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 10% of the average value of its portfolio. |
| Portfolio Turnover, Rate | oef_PortfolioTurnoverRate | 10.00% |
| Expense Example [Heading] | oef_ExpenseExampleHeading | Example |
| Expense Example Narrative [Text Block] | oef_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 does not take into account brokerage commissions or other fees that you may pay to your financial intermediary when purchasing or selling shares of the fund. The example assumes that: you invest $10,000 in the fund for the time periods indicated and you redeem your shares at the end of the time periods; your investment has a 5% return each year; and the fund’s operating expenses remain the same. |
| Expense Example by, Year, Caption [Text] | oef_ExpenseExampleByYearCaption | Although your actual costs will likely be higher or lower, under these assumptions your costs would be: |
| Strategy [Heading] | oef_StrategyHeading | Principal Investment Strategies |
| Strategy Narrative [Text Block] | oef_StrategyNarrativeTextBlock | MFS (Massachusetts Financial Services Company, the fund’s investment adviser) normally invests at least 80% of the fund’s net assets in value companies. Value companies are companies that MFS believes are undervalued compared to their perceived worth in the marketplace. MFS considers a number of factors when determining whether a company is undervalued, including whether (i) the issuer is included in an index which is representative of value companies; (ii) the issuer is classified as a value company by an independent third party financial data provider and/or (iii) the issuer exhibits the characteristics of a value company, considering metrics such as historical and/or projected price-to-book, price-to-earnings, and price-to-cash flow ratios, enterprise value (the total value of the issuer’s outstanding equity and debt) relative to earnings, and free cash flow yield compared to the applicable equity market and/or to issuers in the same sector or industry. In assessing the relative value of an issuer, MFS may also consider measures of financial quality, such as indicators of profitability (i.e., return on equity and return on invested capital), balance sheet strength (including leverage and interest coverage ratios), and capital allocation discipline. Value companies tend to have stock prices that are low relative to their earnings, dividends, assets, or other financial measures. MFS normally invests the fund’s assets primarily in common stocks. Common stocks are equity securities that represent an ownership interest (or right to acquire an ownership interest) in a company or other issuer. While MFS may invest the fund’s assets in securities of companies of any size, MFS primarily invests in securities of companies with large capitalizations. MFS may invest the fund’s assets in foreign securities. MFS normally invests the fund's assets across different industries and sectors, but MFS may invest a significant percentage of the fund's assets in issuers in a single industry or sector. MFS uses an active bottom-up investment approach to buying and selling investments for the fund. Investments are selected primarily based on fundamental analysis of individual issuers. Quantitative screening tools that systematically evaluate issuers may also be considered. For purposes of the fund's 80% policy, net assets include the amount of any borrowings for investment purposes. |
| Summary of Definition of Rule 35d-1 Term in Fund Name [Text Block] | fnd_NmRule35d1TermDfnSmryTextBlock | Value companies are companies that MFS believes are undervalued compared to their perceived worth in the marketplace. MFS considers a number of factors when determining whether a company is undervalued, including whether (i) the issuer is included in an index which is representative of value companies; (ii) the issuer is classified as a value company by an independent third party financial data provider and/or (iii) the issuer exhibits the characteristics of a value company, considering metrics such as historical and/or projected price-to-book, price-to-earnings, and price-to-cash flow ratios, enterprise value (the total value of the issuer’s outstanding equity and debt) relative to earnings, and free cash flow yield compared to the applicable equity market and/or to issuers in the same sector or industry. In assessing the relative value of an issuer, MFS may also consider measures of financial quality, such as indicators of profitability (i.e., return on equity and return on invested capital), balance sheet strength (including leverage and interest coverage ratios), and capital allocation discipline. Value companies tend to have stock prices that are low relative to their earnings, dividends, assets, or other financial measures. |
| Rule 35d-1 Eighty Percent Investment Policy [Text Block] | fnd_NmRule35d1EightyPctInvstmntPlcyTextBlock | MFS (Massachusetts Financial Services Company, the fund’s investment adviser) normally invests at least 80% of the fund’s net assets in value companies. |
| Bar Chart and Performance Table [Heading] | oef_BarChartAndPerformanceTableHeading | Performance Information |
| Performance Narrative [Text Block] | oef_PerformanceNarrativeTextBlock | The bar chart and performance table below are intended to provide some indication of the risks of investing in the fund by showing how the fund’s performance over time compares with that of (i) a broad measure of market performance and (ii) the performance of an additional index that the adviser believes more closely reflects the market segments in which the fund invests. The fund’s past performance (before and after taxes) does not necessarily indicate how the fund will perform in the future. Updated performance is available online at mfs.com. |
| Performance Information Illustrates Variability of Returns [Text] | oef_PerformanceInformationIllustratesVariabilityOfReturns | The bar chart and performance table below are intended to provide some indication of the risks of investing in the fund by showing how the fund’s performance over time compares with that of (i) a broad measure of market performance and (ii) the performance of an additional index that the adviser believes more closely reflects the market segments in which the fund invests. |
| Performance Availability Website Address [Text] | oef_PerformanceAvailabilityWebSiteAddress | mfs.com |
| Performance Past Does Not Indicate Future [Text] | oef_PerformancePastDoesNotIndicateFuture | The fund’s past performance (before and after taxes) does not necessarily indicate how the fund will perform in the future. |
| Bar Chart [Heading] | oef_BarChartHeading | Bar Chart. |
| Bar Chart Closing [Text Block] | oef_BarChartClosingTextBlock | The total return for the three-month period ended March 31, 2026, was 1.23%. During the period(s) shown in the bar chart, the highest quarterly return was 4.40% (for the calendar quarter ended March 31, 2025) and the lowest quarterly return was 1.80% (for the calendar quarter ended December 31, 2025). |
| Performance Table Heading | oef_PerformanceTableHeading | Performance Table. |
| Index No Deduction for Fees, Expenses, or Taxes [Text] | oef_IndexNoDeductionForFeesExpensesTaxes | Reflects no deduction for fees, expenses, or taxes |
| Performance Table Not Relevant to Tax Deferred | oef_PerformanceTableNotRelevantToTaxDeferred | Your actual after-tax returns will depend on your own tax situation, and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (IRAs). |
| Performance Table One Class of after Tax Shown [Text] | oef_PerformanceTableOneClassOfAfterTaxShown | The after-tax returns are shown for only one of the fund’s classes of shares, and after-tax returns for the fund’s other classes of shares will vary from the returns shown. |
| Performance Table Closing [Text Block] | oef_PerformanceTableClosingTextBlock | After-tax returns are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your own tax situation, and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (IRAs). The after-tax returns are shown for only one of the fund’s classes of shares, and after-tax returns for the fund’s other classes of shares will vary from the returns shown. |
| Average Annual Return, Caption [Optional Text] | oef_AverageAnnualReturnCaption | Average Annual Total Returns (For the Periods Ended December 31, 2025) |
| MFS Active Value ETF | Principal Risks | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | Principal Risks As with any exchange-traded fund, the fund may not achieve its objective and/or you could lose money on your investment in the fund. An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The principal risks of investing in the fund are: |
| MFS Active Value ETF | Risk Lose Money [Member] | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | As with any exchange-traded fund, the fund may not achieve its objective and/or you could lose money on your investment in the fund. |
| MFS Active Value ETF | Risk Not Insured [Member] | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. |
| MFS Active Value ETF | Investment Selection Risk | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | Investment Selection Risk: MFS' investment analysis and its selection of investments may not produce the intended results and/or can lead to an investment focus that results in the fund underperforming other funds with similar investment strategies and/or underperforming the markets in which the fund invests. In addition, to the extent MFS considers quantitative tools in managing the fund, such tools may not produce the intended results. |
| MFS Active Value ETF | Equity Market Risk/Company Risk | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | Equity Market Risk/Company Risk: Equity markets are volatile and can decline significantly in response to changes in, or investor perceptions of, issuer, market, economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions. These conditions can affect a single issuer or type of security, issuers within a broad market sector, industry or geographic region, or the equity markets in general. Certain events can have a dramatic adverse effect on equity markets and may lead to periods of high volatility in an equity market or a segment of an equity market. The value of an investment held by the fund may decline due to factors directly related to the issuer. |
| MFS Active Value ETF | Value Company Risk | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | Value Company Risk: The stocks of value companies can continue to be undervalued for long periods of time and not realize their expected value and can be more volatile than the market in general. |
| MFS Active Value ETF | Foreign Risk | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | Foreign Risk: Exposure to foreign markets through issuers or currencies can involve additional risks relating to market, economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions. These factors can make foreign investments, especially those tied economically to countries with developing economies or countries subject to sanctions or the threat of new or modified sanctions, more volatile and less liquid than U.S. investments. In addition, foreign markets can react differently to these conditions than the U.S. market. |
| MFS Active Value ETF | Focus Risk | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | Focus Risk: Issuers in a single industry, sector, country, or region can react similarly to market, currency, political, economic, regulatory, geopolitical, environmental, public health, and other conditions, and the fund's performance will be affected by the conditions in the industries, sectors, countries, and regions to which the fund is exposed. Furthermore, investments in particular industries, sectors, countries, or regions may be more volatile than the broader market as a whole. |
| MFS Active Value ETF | Liquidity Risk | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | Liquidity Risk: It may be difficult to value, and it may not be possible to sell, certain investments, types of investments, and/or investments in certain segments of the market, and the fund may have to sell certain of these investments at prices or times that are not advantageous in order to meet redemptions or other cash needs. |
| MFS Active Value ETF | Fluctuation of Net Asset Value and Share Price Risk | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | Fluctuation of Net Asset Value and Share Price Risk: The net asset value (NAV) per share of the fund will generally fluctuate with changes in the market value of the fund’s holdings. The fund’s shares can be bought and sold in the secondary market at market prices. Disruptions to purchases and sales, the existence of extreme market volatility, and/or a lack of an active trading market for the fund's shares may result in the fund's shares trading significantly above (at a premium) or below (at a discount) to NAV and bid/ask spreads may widen. Shares of the fund may trade at a larger premium or discount to the NAV than shares of other ETFs that focus on other market segments or types of securities. In addition, in stressed market conditions or periods of market disruption or volatility, the market for shares of the fund may become less liquid in response to deteriorating liquidity in the markets for the fund’s underlying portfolio holdings. If you buy fund shares when their market price is at a premium or sell fund shares when their market prices is at a discount, you may pay more than, or receive less than, NAV, respectively. |
| MFS Active Value ETF | Authorized Participant Risks | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | Authorized Participant Risks: Only financial institutions authorized to transact daily with the fund (Authorized Participants) may engage in creation or redemption transactions directly with the fund, and Authorized Participants are not obligated to do so. To the extent an Authorized Participant cannot or is otherwise unwilling to engage in creation and redemption transactions, and no other Authorized Participant engages in such transactions, shares of the fund may trade at a significant discount or premium to NAV, experience wider intraday bid/ask spreads, and may face trading halts and/or delisting from the exchange. |
| MFS Active Value ETF | Trading Issues Risk | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | Trading Issues Risk: There can be no assurance that an active trading market for the fund’s shares will develop or be maintained. In addition, trading of the fund’s shares may be halted or become less liquid. Shares of the fund, similar to shares of other issuers listed on a stock exchange, may be sold short and are therefore subject to the risk of increased volatility and price decreases associated with being sold short. Most fund investors will buy and sell fund shares on the listing exchange or on another secondary market. When buying or selling shares of the fund, investors typically will pay brokerage commissions or other charges imposed by financial intermediaries as determined by that financial intermediary. |
| MFS Active Value ETF | Cash Transactions Risk | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Risk [Text Block] | oef_RiskTextBlock | Cash Transactions Risk: Unlike certain ETFs that distribute portfolio securities entirely in-kind, the fund may effect some or all creations and redemptions using cash, rather than in-kind securities. As a result, an investment in the fund may be less tax-efficient than an investment in an ETF that distributes portfolio securities entirely in-kind. |
| MFS Active Value ETF | Russell 3000® Index | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Average Annual Return, Label [Optional Text] | oef_AverageAnnualReturnLabel | Russell 3000® Index |
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 17.15% |
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 11.63% |
| Performance Inception Date | oef_PerfInceptionDate | Dec. 05, 2024 |
| MFS Active Value ETF | Russell 1000® Value Index | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Average Annual Return, Label [Optional Text] | oef_AverageAnnualReturnLabel | Russell 1000® Value Index |
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 15.91% |
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 8.60% |
| Performance Inception Date | oef_PerfInceptionDate | Dec. 05, 2024 |
| MFS Active Value ETF | MFS Active Value ETF | ||
| Risk/Return: | oef_RiskReturnAbstract | |
| Trading Symbol | dei_TradingSymbol | MFSV |
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.00% |
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | oef_MaximumDeferredSalesChargeOverOfferingPrice | 0.00% |
| Management Fees (as a percentage of Assets) | oef_ManagementFeesOverAssets | 0.44% |
| Other Expenses (as a percentage of Assets): | oef_OtherExpensesOverAssets | 0.00% |
| Expenses (as a percentage of Assets) | oef_ExpensesOverAssets | 0.44% |
| Expense Example, with Redemption, 1 Year | oef_ExpenseExampleYear01 | $ 45 |
| Expense Example, with Redemption, 3 Years | oef_ExpenseExampleYear03 | 141 |
| Expense Example, with Redemption, 5 Years | oef_ExpenseExampleYear05 | 246 |
| Expense Example, with Redemption, 10 Years | oef_ExpenseExampleYear10 | $ 555 |
| Year to Date Return, Label [Optional Text] | oef_YearToDateReturnLabel | The total return for the three-month period ended |
| Bar Chart, Year to Date Return, Date | oef_BarChartYearToDateReturnDate | Mar. 31, 2026 |
| Bar Chart, Year to Date Return | oef_BarChartYearToDateReturn | 1.23% |
| Highest Quarterly Return, Label [Optional Text] | oef_HighestQuarterlyReturnLabel | highest quarterly return |
| Highest Quarterly Return, Date | oef_BarChartHighestQuarterlyReturnDate | Mar. 31, 2025 |
| Highest Quarterly Return | oef_BarChartHighestQuarterlyReturn | 4.40% |
| Lowest Quarterly Return, Label [Optional Text] | oef_LowestQuarterlyReturnLabel | lowest quarterly return |
| Lowest Quarterly Return, Date | oef_BarChartLowestQuarterlyReturnDate | Dec. 31, 2025 |
| Lowest Quarterly Return | oef_BarChartLowestQuarterlyReturn | 1.80% |
| Annual Return [Percent] | oef_AnnlRtrPct | 13.40% |