Shareholder Report, Line Graph (Details) - USD ($) |
3 Months Ended | 5 Months Ended | 9 Months Ended | 11 Months Ended | 12 Months Ended | 15 Months Ended | 17 Months Ended | 21 Months Ended | 23 Months Ended | 27 Months Ended | 29 Months Ended | 33 Months Ended | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Feb. 27, 2024 |
Nov. 07, 2023 |
Jan. 31, 2024 |
Jul. 31, 2024 |
Jul. 31, 2024 |
Jan. 31, 2025 |
Jul. 31, 2026 |
Jan. 31, 2025 |
Jul. 31, 2025 |
Jul. 31, 2025 |
Jan. 31, 2026 |
Jan. 31, 2026 |
Jul. 31, 2026 |
Jul. 31, 2026 |
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| C000246109 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | First Trust Core Investment Grade ETF | |||||||||||||
| Accumulated Value | $ 10,000 | $ 10,640 | $ 10,877 | $ 10,932 | $ 11,326 | $ 11,801 | $ 11,695 | |||||||
| C000248162 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | First Trust AAA CMBS ETF | |||||||||||||
| Accumulated Value | $ 10,000 | $ 10,341 | $ 10,584 | $ 10,969 | $ 11,371 | $ 11,406 | ||||||||
| C000248350 [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | First Trust Structured Credit Income Opportunities ETF | |||||||||||||
| Accumulated Value | 10,000 | 10,406 | 10,833 | 11,326 | 11,801 | 11,922 | ||||||||
| Bloomberg US Aggregate Bond Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Bloomberg US Aggregate Bond Index | |||||||||||||
| Accumulated Value | 10,000 | 10,000 | 10,576 | 10,377 | 10,775 | 10,396 | 10,794 | 10,728 | 11,140 | 11,108 | 11,534 | 11,019 | 11,441 | |
| ICE BofA US Broad Market Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ICE BofA US Broad Market Index | |||||||||||||
| Accumulated Value | $ 10,000 | $ 10,575 | $ 10,782 | $ 10,805 | $ 11,149 | $ 11,539 | $ 11,452 | |||||||
| Bloomberg Non Agency Investment Grade CMBS US Aggregate Eligible Aaa Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Non-Agency Investment Grade CMBS: US Aggregate Eligible Aaa Index | |||||||||||||
| Accumulated Value | 10,000 | 10,358 | 10,605 | 10,990 | 11,398 | 11,418 | ||||||||
| ICE BofA US ABS And CMBS Index [Member] | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ICE BofA US ABS & CMBS Index | |||||||||||||
| Accumulated Value | $ 10,000 | $ 10,347 | $ 10,603 | $ 10,922 | $ 11,266 | $ 11,354 |