S000057702 [Member] Fees and Expenses - Franklin ClearBridge Enhanced Income ETF |
Mar. 31, 2026 |
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| Prospectus [Line Items] | |||||||
| Expense Heading [Optional Text] | Fees and expenses of the fund | ||||||
| Expense Narrative [Text Block] | The accompanying table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may also be subject to additional fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and Example below. The management agreement between Legg Mason ETF Investment Trust (the “Trust”) and Franklin Templeton Fund Adviser, LLC (“FTFA” or the “manager”) (the “Management Agreement”) provides that the manager will pay all operating expenses of the fund, except interest expenses, taxes, brokerage expenses, future Rule 12b‑1 fees (if any), acquired fund fees and expenses, extraordinary expenses and the management fee payable to the manager under the Management Agreement. The manager will also pay all subadvisory fees of the fund.
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| Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] | Total annual fund operating expenses do not correlate with the ratios of expenses to average net assets reported in the fund’s financial highlights tables, which reflect the fund’s operating expenses and do not include acquired fund fees and expenses. | ||||||
| Shareholder Fees Caption [Optional Text] | Shareholder fees(fees paid directly from your investment) | ||||||
| Operating Expenses Caption [Optional Text] | Annual fund operating expenses (%)(expenses that you pay each year as a percentage of the value of your investment) | ||||||
| Expense Example [Heading] | Example: | ||||||
| Expense Example Narrative [Text Block] | 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:
You may also incur usual and customary brokerage commissions and other charges when buying or selling shares of the fund, which are not reflected in the example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
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| Expense Example by, Year, Caption [Text] | Number of years you own your shares ($) | ||||||
| Expense Example, No Redemption, By Year, Caption [Text] | Number of years you own your shares ($) | ||||||
| Portfolio Turnover [Heading] | Portfolio turnover. | ||||||
| Portfolio Turnover [Text Block] | 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. During the most recent fiscal year, the fund’s portfolio turnover rate was 40% of the average value of its portfolio. | ||||||
| Portfolio Turnover, Rate | 40.00% |