Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Thornburg Investment Income Builder Fund - Class A | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 36.55% | 13.13% | 17.90% | (8.27%) | 20.02% | (0.65%) | 17.66% | (4.62%) | 14.78% | 9.50% |
| Thornburg Summit Fund - Class A | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 20.34% | 11.15% | 12.49% | |||||||