Shareholder Report |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||
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Aug. 31, 2026
USD ($)
Holding
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| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Document Type | N-CSR | |||||||||||||||||||||||||||||||||||||||||||||||
| Amendment Flag | false | |||||||||||||||||||||||||||||||||||||||||||||||
| Registrant Name | BNY Mellon ETF Trust II | |||||||||||||||||||||||||||||||||||||||||||||||
| Entity Central Index Key | 0002025968 | |||||||||||||||||||||||||||||||||||||||||||||||
| Entity Investment Company Type | N-1A | |||||||||||||||||||||||||||||||||||||||||||||||
| Document Period End Date | Aug. 31, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||
| C000256918 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | BNY Mellon Enhanced Dividend and Income ETF | |||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | BNY Mellon Enhanced Dividend and Income ETF | |||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | BEDY | |||||||||||||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BNY Mellon Enhanced Dividend and Income ETF (the “Fund”) for the period of September 1, 2025 to August 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at bny.com/investments/etfliterature. You can also request this information by calling 1-833-383-2696 or calling your financial adviser. | |||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-833-383-2696 | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | bny.com/investments/etfliterature | |||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund’s costs for the last year ?
(based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 79 | [1] | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.71% | [1] | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform last year ?
What affected the Fund’s performance?
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
How did the Fund perform over the past 10 years?
The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance from September 1 , 2016 through August 31, 2026
Initial Investment of $10,000 The above graph compares a hypothetical $10,000 investment in the Fund’s shares to a hypothetical investment of $10,000 made in each of the Russell 1000® Index (a broad-based index), Russell 1000® Value Index and Dow Jones U.S. Select Dividend™ Index on 8/31/2016. The performance shown takes into account applicable fees and expenses of the Fund, including management fees, 12b-1 fees and other expenses. The Fund’s performance also assumes the reinvestment of dividends and capital gains. Unlike the Fund, the indexes are not subject to fees and other expenses. Investors cannot invest directly in any index.
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| Average Annual Return [Table Text Block] |
AVERAGE ANNUAL TOTAL RETURNS (AS OF 8/31/26 )
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| Performance Inception Date | Dec. 05, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | For more current information visitbny.com/investments/etfliterature. | |||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 243,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 59 | |||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 818,671 | |||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 134.24% | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (AS OF 8/31/26 )
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| Holdings [Text Block] |
Portfolio Holdings (as of 8/31/26 )
Top Ten Holdings (Based on Net Assets) *
* Excludes money market funds or other short-term securities held for the investment of cash and cash collateral for securities loaned, if any.
Sector Allocation (Based on Net Assets)
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| Largest Holdings [Text Block] |
Top Ten Holdings (Based on Net Assets) *
* Excludes money market funds or other short-term securities held for the investment of cash and cash collateral for securities loaned, if any.
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| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since September 1, 2025 . For more complete information, you may review the Fund’s current prospectus dated December 5, 2025 at bny.com/investments/etfliterature or upon request at 1-833-383-2696 or by calling your financial adviser.
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| Material Fund Change Expenses [Text Block] | Prior to the Reorganization, the Predecessor Fund discontinued the imposition of distribution fees, which had previously been paid to BNY Mellon Securities Corporation, the Predecessor Fund’s distributor (“Distributor”), at an annual rate of .75% of the value of Class C shares based on average daily net assets. The Predecessor Fund also discontinued the imposition of shareholder services fees, which had previously been paid to the Distributor at an annual rate of .25% of the value of each of the Predecessor Fund’s Investor, Class A and Class C shares based on average daily net assets. | |||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] |
This is a summary of certain changes to the Fund since September 1, 2025 . For more complete information, you may review the Fund’s current prospectus dated December 5, 2025 at bny.com/investments/etfliterature or upon request at 1-833-383-2696 or by calling your financial adviser.
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| Updated Prospectus Phone Number | 1-833-383-2696 | |||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | bny.com/investments/etfliterature | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Statement [Text Block] | Starting December 5, 2025, in connection with the Reorganization noted above, Ernst & Young LLP (“EY”) became the independent registered public accounting firm of the Fund and KPMG LLP was discharged as the Predecessor Fund’s accounting firm. EY serves as the independent registered public accounting firm for all funds in the BNY Mellon ETF Trust II. | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Date | Dec. 05, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in or Disagreements with Accountants
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| C000264329 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | BNY Mellon Active Core Bond ETF | |||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | BNY Mellon Active Core Bond ETF | |||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | BKFI | |||||||||||||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NYSEArca | |||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BNY Mellon Active Core Bond ETF (the “Fund”) for the period of September 1, 2025 to August 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at bny.com/investments/etfliterature. You can also request this information by calling 1-833-383-2696 or calling your financial adviser. | |||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-833-383-2696 | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | bny.com/investments/etfliterature | |||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund’s costs for the last year ?
(based on a hypothetical $10,000 investment)
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| Expenses Paid, Amount | $ 53 | |||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.53% | |||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform last year ?
What affected the Fund’s performance?
|
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
How did the Fund perform over the past 10 years?
The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance from September 1 , 2016 through August 31, 2026
Initial Investment of $10,000 The above graph compares a hypothetical $10,000 investment in the Fund’s shares to a hypothetical investment of $10,000 made in each of the Bloomberg U.S. Aggregate Bond Index (a broad-based index), Bloomberg U.S. Government/Credit Bond Index (a broad-based index) and Bloomberg U.S. Intermediate Government/Credit Index on 8/31/2016. The performance shown takes into account applicable fees and expenses of the Fund, including management fees and other expenses. The Fund’s performance also assumes the reinvestment of dividends and capital gains. Unlike the Fund, the indexes are not subject to fees and other expenses. Investors cannot invest directly in any index.
|
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| Average Annual Return [Table Text Block] |
AVERAGE ANNUAL TOTAL RETURNS (AS OF 8/31/26 )
|
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| Performance Inception Date | Jan. 09, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | For more current information visit bny.com/investments/etfliterature . | |||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 249,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 292 | |||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,380,148 | |||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 124.41% | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (AS OF 8/31/26 )
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| Holdings [Text Block] |
Portfolio Holdings (as of 8/31/26 )
Sector Allocation (Based on Net Assets)
Allocation of Holdings (Based on Net Assets)
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| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since September 1, 2025 . For more complete information, you may review the Fund’s current prospectus dated December 31, 2025 at bny.com/investments/etfliterature or upon request at 1-833-383-2696 or by calling your financial adviser.
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| Material Fund Change Expenses [Text Block] | Prior to the Reorganization, the Predecessor Fund discontinued the imposition of shareholder services fees, which had previously been paid to BNY Mellon Securities Corporation, the Predecessor Fund’s distributor (“Distributor”), at an annual rate of .25% of the value of Investor class shares based on average daily net assets. | |||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] |
This is a summary of certain changes to the Fund since September 1, 2025 . For more complete information, you may review the Fund’s current prospectus dated December 31, 2025 at bny.com/investments/etfliterature or upon request at 1-833-383-2696 or by calling your financial adviser.
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| Updated Prospectus Phone Number | 1-833-383-2696 | |||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | bny.com/investments/etfliterature | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Statement [Text Block] | Starting January 9, 2026, in connection with the Reorganization noted above, Ernst & Young LLP (“EY”) became the independent registered public accounting firm of the Fund and KPMG LLP was discharged as the Predecessor Fund’s accounting firm. EY serves as the independent registered public accounting firm for all funds in the BNY Mellon ETF Trust II. | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Date | Jan. 09, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in or Disagreements with Accountants
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| C000264330 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | BNY Mellon Core Plus ETF | |||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | BNY Mellon Core Plus ETF | |||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | BCPL | |||||||||||||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NYSEArca | |||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BNY Mellon Core Plus ETF (the “Fund”) for the period of September 1, 2025 to August 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at bny.com/investments/etfliterature. You can also request this information by calling 1-833-383-2696 or calling your financial adviser. | |||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-833-383-2696 | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | bny.com/investments/etfliterature | |||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund’s costs for the last year ?
(based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 53 | |||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.52% | |||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform last year ?
What affected the Fund’s performance?
|
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
How did the Fund perform over the past 10 years?
The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance from September 1 , 2016 through August 31, 2026
Initial Investment of $10,000 The above graph compares a hypothetical $10,000 investment in the Fund’s shares to a hypothetical investment of $10,000 made in each of the Bloomberg U.S. Aggregate Bond Index (a broad-based index) and Bloomberg U.S. Intermediate Credit Index on 8/31/2016. The performance shown takes into account applicable fees and expenses of the Fund, including management fees and other expenses. The Fund’s performance also assumes the reinvestment of dividends and capital gains. Unlike the Fund, the indexes are not subject to fees and other expenses. Investors cannot invest directly in any index.
|
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| Average Annual Return [Table Text Block] |
AVERAGE ANNUAL TOTAL RETURNS (AS OF 8/31/26 )
|
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| Performance Inception Date | Jan. 09, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||||||||||||||||||||||||||||||
| Prior Market Index Comparison [Text Block] | Effective January 12, 2026, the date shares of the Fund began trading on NYSE Arca, Inc., the Fund will no longer use the Bloomberg U.S. Intermediate Credit Index as a performance-based benchmark. Insight North America LLC, the Fund’s sub-adviser, believes the Bloomberg U.S. Aggregate Bond Index is a more appropriate performance comparison given the Fund’s investment strategy and Insight North America LLC’s investment process. Performance of the index will not be shown in the future. | |||||||||||||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | For more current information visitbny.com/investments/etfliterature. | |||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 309,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 364 | |||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,409,990 | |||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 190.66% | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (AS OF 8/31/26 )
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| Holdings [Text Block] |
Portfolio Holdings (as of 8/31/26 )
Sector Allocation (Based on Net Assets)
Allocation of Holdings (Based on Net Assets)
* Amount represents less than .1%.
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| Material Fund Change [Text Block] | How has the Fund changed?
This is a summary of certain changes to the Fund since September 1, 2025 . For more complete information, you may review the Fund’s current prospectus dated December 31, 2025 at bny.com/investments/etfliterature or upon request at 1-833-383-2696 or by calling your financial adviser.
|
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| Material Fund Change Expenses [Text Block] | Prior to the Reorganization, the Predecessor Fund discontinued the imposition of shareholder services fees, which had previously been paid to BNY Mellon Securities Corporation, the Predecessor Fund’s distributor (“Distributor”), at an annual rate of .25% of the value of Investor class shares based on average daily net assets. | |||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] |
This is a summary of certain changes to the Fund since September 1, 2025 . For more complete information, you may review the Fund’s current prospectus dated December 31, 2025 at bny.com/investments/etfliterature or upon request at 1-833-383-2696 or by calling your financial adviser.
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| Updated Prospectus Phone Number | 1-833-383-2696 | |||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | bny.com/investments/etfliterature | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Statement [Text Block] | Starting January 9, 2026, in connection with the Reorganization noted above, Ernst & Young LLP (“EY”) became the independent registered public accounting firm of the Fund and KPMG LLP was discharged as the Predecessor Fund’s accounting firm. EY serves as the independent registered public accounting firm for all funds in the BNY Mellon ETF Trust II. | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Date | Jan. 09, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] | Changes in or Disagreements with Accountants
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| C000264331 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | BNY Mellon Municipal Intermediate ETF | |||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | BNY Mellon Municipal Intermediate ETF | |||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | BKMI | |||||||||||||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BNY Mellon Municipal Intermediate ETF (the “Fund”) for the period of September 1, 2025 to August 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at bny.com/investments/etfliterature. You can also request this information by calling 1-833-383-2696 or calling your financial adviser. | |||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-833-383-2696 | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | bny.com/investments/etfliterature | |||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund’s costs for the last year ?
(based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 44 | |||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.43% | |||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform last year ?
What affected the Fund’s performance?
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. Cumulative Performance from September 1 , 2016 through August 31, 2026 Initial Investment of $10,000 The above graph compares a hypothetical $10,000 investment in the Fund’s shares to a hypothetical investment of $10,000 made in each of the Bloomberg U.S. Municipal Bond Index (a broad-based index), S&P Municipal Bond Index (a broad-based index), Bloomberg Municipal 3-15 Years Blend Index and S&P Municipal Bond Investment Grade Intermediate Index on 8/31/2016. The performance shown takes into account applicable fees and expenses of the Fund, including management fees and other expenses. The Fund’s performance also assumes the reinvestment of dividends and capital gains. Unlike the Fund, the indexes are not subject to fees and other expenses. Investors cannot invest directly in any index.
|
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| Average Annual Return [Table Text Block] |
AVERAGE ANNUAL TOTAL RETURNS (AS OF 8/31/26 )
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| Performance Inception Date | Jan. 09, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | For more current information visitbny.com/investments/etfliterature. | |||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,665,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 529 | |||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 6,122,578 | |||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 37.28% | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (AS OF 8/31/26 )
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| Holdings [Text Block] |
Portfolio Holdings (as of 8/31/26 )
Sector Allocation (Based on Net Assets)
State Allocation (Based on Net Assets)
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| Material Fund Change [Text Block] | How has the Fund changed?
This is a summary of certain changes to the Fund since September 1, 2025 . For more complete information, you may review the Fund’s current prospectus dated December 31, 2025 at bny.com/investments/etfliterature or upon request at 1-833-383-2696 or by calling your financial adviser.
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| Material Fund Change Expenses [Text Block] | Prior to the Reorganization, the Predecessor Fund discontinued the imposition of shareholder services fees, which had previously been paid to BNY Mellon Securities Corporation, the Predecessor Fund’s distributor (“Distributor”), at an annual rate of .25% of the value of Investor class shares based on average daily net assets. | |||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] |
This is a summary of certain changes to the Fund since September 1, 2025 . For more complete information, you may review the Fund’s current prospectus dated December 31, 2025 at bny.com/investments/etfliterature or upon request at 1-833-383-2696 or by calling your financial adviser.
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| Updated Prospectus Phone Number | 1-833-383-2696 | |||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | bny.com/investments/etfliterature | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Statement [Text Block] | Starting January 9, 2026, in connection with the Reorganization noted above, Ernst & Young LLP (“EY”) became the independent registered public accounting firm of the Fund and KPMG LLP was discharged as the Predecessor Fund’s accounting firm. EY serves as the independent registered public accounting firm for all funds in the BNY Mellon ETF Trust II. | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Date | Jan. 09, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in or Disagreements with Accountants
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| C000264332 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | BNY Mellon Municipal Opportunities ETF | |||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | BNY Mellon Municipal Opportunities ETF | |||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | BMOP | |||||||||||||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BNY Mellon Municipal Opportunities ETF (the “Fund”) for the period of September 1, 2025 to August 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at bny.com/investments/etfliterature. You can also request this information by calling 1-833-383-2696 or calling your financial adviser. | |||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | 1-833-383-2696 | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | bny.com/investments/etfliterature | |||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund’s costs for the last year ?
(based on a hypothetical $10,000 investment)
|
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| Expenses Paid, Amount | $ 65 | [2] | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.63% | [2] | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform last year ?
What affected the Fund’s performance?
|
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
How did the Fund perform over the past 10 years?
The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance from September 1 , 2016 through August 31, 2026
Initial Investment of $10,000 The above graph compares a hypothetical $10,000 investment in the Fund’s shares to a hypothetical investment of $10,000 made in each of the Bloomberg U.S. Municipal Bond Index (a broad-based index) and S&P Municipal Bond Index (a broad-based index) on 8/31/2016. The performance shown takes into account applicable fees and expenses of the Fund, including management fees and other expenses. The Fund’s performance also assumes the reinvestment of dividends and capital gains. Unlike the Fund, the indexes are not subject to fees and other expenses. Investors cannot invest directly in any index.
|
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| Average Annual Return [Table Text Block] |
AVERAGE ANNUAL TOTAL RETURNS (AS OF 8/31/26 )
|
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| Performance Inception Date | Jan. 09, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||||||||||||||||||||||||||||||
| Prior Market Index Comparison [Text Block] | Effective January 12, 2026, the date shares of the Fund began trading on The Nasdaq Stock Market LLC, the Fund’s broad-based benchmark will be the Bloomberg U.S. Municipal Bond Index. Insight North America LLC, the Fund’s sub-adviser, believes the Bloomberg index is a more appropriate comparisons given the Fund’s investment strategy and Insight North America LLC’s investment process. | |||||||||||||||||||||||||||||||||||||||||||||||
| Material Change Date | Jul. 13, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | For more current information visit bny.com/investments/etfliterature . | |||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 1,749,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 669 | |||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 9,082,884 | |||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 31.68% | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (AS OF 8/31/26 )
|
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| Holdings [Text Block] |
Portfolio Holdings (as of 8/31/26 )
Sector Allocation (Based on Net Assets)
State Allocation (Based on Net Assets)
|
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| Material Fund Change [Text Block] |
How has the Fund changed?
This is a summary of certain changes to the Fund since September 1, 2025 . For more complete information, you may review the Fund’s current prospectus dated December 31, 2025 at bny.com/investments/etfliterature or upon request at 1-833-383-2696 or by calling your financial adviser.
|
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| Material Fund Change Expenses [Text Block] | Prior to the Reorganization, the Predecessor Fund discontinued the imposition of shareholder services fees, which had previously been paid to BNY Mellon Securities Corporation, the Predecessor Fund’s distributor (“Distributor”), at an annual rate of .25% of the value of Investor class shares based on average daily net assets.Effective July 13, 2026, BNY Mellon ETF Investment Adviser, LLC, the Fund’s Adviser, has agreed to waive receipt of a portion of its management fee in the amount of 0.05% of the value of the Fund's average daily net assets until December 31, 2027. | |||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] |
This is a summary of certain changes to the Fund since September 1, 2025 . For more complete information, you may review the Fund’s current prospectus dated December 31, 2025 at bny.com/investments/etfliterature or upon request at 1-833-383-2696 or by calling your financial adviser.
|
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| Updated Prospectus Phone Number | 1-833-383-2696 | |||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | bny.com/investments/etfliterature | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Statement [Text Block] | Starting January 9, 2026, in connection with the Reorganization noted above, Ernst & Young LLP (“EY”) became the independent registered public accounting firm of the Fund and KPMG LLP was discharged as the Predecessor Fund’s accounting firm. EY serves as the independent registered public accounting firm for all funds in the BNY Mellon ETF Trust II. | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Date | Jan. 09, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in or Disagreements with Accountants
|
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| C000264333 [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Fund Name | BNY Mellon Municipal Short Duration ETF | |||||||||||||||||||||||||||||||||||||||||||||||
| Class Name | BNY Mellon Municipal Short Duration ETF | |||||||||||||||||||||||||||||||||||||||||||||||
| Trading Symbol | BKMS | |||||||||||||||||||||||||||||||||||||||||||||||
| Security Exchange Name | NASDAQ | |||||||||||||||||||||||||||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about BNY Mellon Municipal Short Duration ETF (the “Fund”) for the period of September 1, 2025 to August 31, 2026. | |||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at bny.com/investments/etfliterature. You can also request this information by calling 1-833-383-2696 or calling your financial adviser. | |||||||||||||||||||||||||||||||||||||||||||||||
| Material Fund Change Notice [Text Block] |
This report describes changes to the Fund that occurred during the reporting period.
|
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| Additional Information Phone Number | 1-833-383-2696 | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Information Website | bny.com/investments/etfliterature | |||||||||||||||||||||||||||||||||||||||||||||||
| Expenses [Text Block] |
What were the Fund’s costs for the last year ?
(based on a hypothetical $10,000 investment)
|
|||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Paid, Amount | $ 41 | [3] | ||||||||||||||||||||||||||||||||||||||||||||||
| Expense Ratio, Percent | 0.41% | [3] | ||||||||||||||||||||||||||||||||||||||||||||||
| Factors Affecting Performance [Text Block] |
How did the Fund perform last year ?
What affected the Fund’s performance?
|
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not a good predictor of the Fund’s future performance. | |||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph [Table Text Block] |
How did the Fund perform over the past 10 years?
The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance from September 1 , 2016 through August 31, 2026
Initial Investment of $10,000 The above graph compares a hypothetical $10,000 investment in the Fund’s shares to a hypothetical investment of $10,000 made in each of the Bloomberg U.S. Municipal Bond Index (a broad-based index), S&P Municipal Bond Index (a broad-based index), Bloomberg Municipal 1-3 Years Index and S&P Municipal Bond Investment Grade Short Index on 8/31/2016. The performance shown takes into account applicable fees and expenses of the Fund, including management fees and other expenses. The Fund’s performance also assumes the reinvestment of dividends and capital gains. Unlike the Fund, the indexes are not subject to fees and other expenses. Investors cannot invest directly in any index.
|
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| Average Annual Return [Table Text Block] |
AVERAGE ANNUAL TOTAL RETURNS (AS OF 8/31/26 )
|
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| Performance Inception Date | Jan. 09, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. | |||||||||||||||||||||||||||||||||||||||||||||||
| Updated Performance Information Location [Text Block] | For more current information visitbny.com/investments/etfliterature. | |||||||||||||||||||||||||||||||||||||||||||||||
| Net Assets | $ 429,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Holdings Count | Holding | 253 | |||||||||||||||||||||||||||||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,384,491 | |||||||||||||||||||||||||||||||||||||||||||||||
| Investment Company Portfolio Turnover | 42.96% | |||||||||||||||||||||||||||||||||||||||||||||||
| Additional Fund Statistics [Text Block] |
KEY FUND STATISTICS (AS OF 8/31/26 )
|
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| Holdings [Text Block] |
Portfolio Holdings (as of 8/31/26 )
Sector Allocation (Based on Net Assets)
State Allocation (Based on Net Assets)
|
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| Material Fund Change [Text Block] | How has the Fund changed?
This is a summary of certain changes to the Fund since September 1, 2025 . For more complete information, you may review the Fund’s current prospectus dated December 31, 2025 at bny.com/investments/etfliterature or upon request at 1-833-383-2696 or by calling your financial adviser.
|
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| Material Fund Change Expenses [Text Block] | Prior to the Reorganization, the Predecessor Fund discontinued the imposition of shareholder services fees, which had previously been paid to BNY Mellon Securities Corporation, the Predecessor Fund’s distributor (“Distributor”), at an annual rate of .25% of the value of Investor class shares based on average daily net assets. | |||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Change Legend [Text Block] |
This is a summary of certain changes to the Fund since September 1, 2025 . For more complete information, you may review the Fund’s current prospectus dated December 31, 2025 at bny.com/investments/etfliterature or upon request at 1-833-383-2696 or by calling your financial adviser.
|
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| Updated Prospectus Phone Number | 1-833-383-2696 | |||||||||||||||||||||||||||||||||||||||||||||||
| Updated Prospectus Web Address | bny.com/investments/etfliterature | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Statement [Text Block] | Starting January 9, 2026, in connection with the Reorganization noted above, Ernst & Young LLP (“EY”) became the independent registered public accounting firm of the Fund and KPMG LLP was discharged as the Predecessor Fund’s accounting firm. EY serves as the independent registered public accounting firm for all funds in the BNY Mellon ETF Trust II. | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Date | Jan. 09, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||
| Accountant Change Disagreements [Text Block] |
Changes in or Disagreements with Accountants
|
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