MFS Research International Portfolio Expense Example - MFS Research International Portfolio |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class A | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 57 |
| Expense Example, with Redemption, 3 Years | 221 |
| Expense Example, with Redemption, 5 Years | 398 |
| Expense Example, with Redemption, 10 Years | 913 |
| Class B | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 83 |
| Expense Example, with Redemption, 3 Years | 299 |
| Expense Example, with Redemption, 5 Years | 534 |
| Expense Example, with Redemption, 10 Years | 1,207 |
| Class E | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 73 |
| Expense Example, with Redemption, 3 Years | 268 |
| Expense Example, with Redemption, 5 Years | 480 |
| Expense Example, with Redemption, 10 Years | $ 1,090 |