Annual Total Returns - Loomis Sayles Funds I - Classes Admin, Retail, Institutional, and N - Institutional |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Loomis Sayles Income Fund | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 9.14% | 6.70% | 8.05% | (12.49%) | 3.23% | 2.14% | 11.57% | (2.87%) | 7.48% | 8.63% |
| Loomis Sayles Investment Grade Fixed Income Fund | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 7.59% | 3.14% | 8.00% | (11.98%) | 0.80% | 7.19% | 9.36% | (2.08%) | 8.42% | 6.41% |