S000006018 [Member] Expense Example - Versatile Bond Portfolio |
Jan. 31, 2026
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 67 |
| Expense Example, with Redemption, 3 Years | 330 |
| Expense Example, with Redemption, 5 Years | 614 |
| Expense Example, with Redemption, 10 Years | 1,423 |
| Class A | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 489 |
| Expense Example, with Redemption, 3 Years | 794 |
| Expense Example, with Redemption, 5 Years | 1,120 |
| Expense Example, with Redemption, 10 Years | 2,041 |
| Class C | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 272 |
| Expense Example, with Redemption, 3 Years | 643 |
| Expense Example, with Redemption, 5 Years | 1,144 |
| Expense Example, with Redemption, 10 Years | $ 2,521 |