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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
Feb. 27, 2024 |
Nov. 07, 2023 |
Jan. 31, 2024 |
Jul. 31, 2024 |
Jul. 31, 2024 |
Jan. 31, 2025 |
Jul. 31, 2025 |
Jan. 31, 2025 |
Jul. 31, 2025 |
Jul. 31, 2025 |
|
| 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 | |||||
| C000248162 [Member] | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | First Trust Commercial Mortgage Opportunities ETF | |||||||||
| Accumulated Value | $ 10,000 | $ 10,341 | $ 10,584 | $ 10,969 | ||||||
| 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 | ||||||
| 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 | 10,575 | 10,782 | 10,805 | 11,140 | ||||
| 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 | $ 10,576 | $ 10,775 | $ 10,794 | $ 11,149 | |||||
| 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 | ||||||
| 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 |