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Shareholder Report
 6 Months Ended
Sep. 30, 2024
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Franklin ETF Trust
Entity Central Index Key 0001551895
Entity Investment Company Type N-1A
Document Period End Date Sep. 30, 2024
Franklin Short Duration U.S. Government ETF  
Shareholder Report [Line Items]  
Fund Name Franklin Short Duration U.S. Government ETF
Class Name Franklin Short Duration U.S. Government ETF
Trading Symbol FTSD
Security Exchange Name NYSE
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Franklin Short Duration U.S. Government ETF for the period April 1, 2024, to September 30, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) DIAL BEN/342-5236.
Additional Information Phone Number (800) DIAL BEN/342-5236
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?  (based on a hypothetical $10,000 investment)
Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Franklin Short Duration U.S. Government ETF
$12
0.24%
[1],[2]
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.24%
Net Assets $ 157,365,903
Holdings Count | $ / shares 332 [3]
Investment Company Portfolio Turnover 52.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of September 30, 2024)
Total Net Assets
$157,365,903
Total Number of Portfolio Holdings*
332
Portfolio Turnover Rate
52%
[3]
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
[1]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[2]
† Annualized.
[3]
* Does not include derivatives, except purchased options, if any.