Shareholder Report, Line Graph (Details) 1014013_Franklin U.S. Equity Index ETF_Single Class_TSR Annual {Single Class} - USD ($) |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
Mar. 31, 2022 |
Mar. 31, 2021 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2018 |
Mar. 31, 2017 |
Jun. 01, 2016 |
Mar. 31, 2026 |
|
| Franklin U.S. Equity Index ETF | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Franklin U.S. Equity Index ETF (NAV) | ||||||||||
| Accumulated Value | $ 23,964 | $ 22,169 | $ 17,009 | $ 18,615 | $ 17,078 | $ 11,815 | $ 13,205 | $ 12,517 | $ 10,995 | $ 10,000 | $ 28,152 |
| Morningstar US Target Market Exposure Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Morningstar US Target Market Exposure Index | ||||||||||
| Linked Morningstar US Target Market Exposure Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Linked Morningstar US Target Market Exposure Index | ||||||||||
| Accumulated Value | $ 23,661 | $ 21,880 | $ 16,788 | $ 18,360 | $ 16,837 | $ 11,661 | $ 13,027 | $ 12,351 | $ 10,838 | $ 10,000 | $ 27,809 |