Annual Total Returns - Class A |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| MFS Corporate Bond Fund | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 7.33% | 2.77% | 8.84% | (16.61%) | (1.48%) | 10.99% | 14.41% | (3.20%) | 6.06% | 5.81% |
| MFS Limited Maturity Fund | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 5.69% | 5.15% | 5.94% | (4.27%) | (0.25%) | 4.14% | 4.72% | 1.17% | 1.29% | 1.44% |
| MFS Municipal Limited Maturity Fund | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 4.95% | 2.89% | 4.35% | (5.28%) | 0.71% | 3.26% | 5.31% | 1.28% | 3.22% | 0.05% |
| MFS Total Return Bond Fund | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 7.17% | 2.30% | 7.06% | (13.96%) | (1.06%) | 8.68% | 9.89% | (1.28%) | 4.08% | 3.54% |