S000006016 [Member] Expense Example - Permanent Portfolio |
Jan. 31, 2026
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 81 |
| Expense Example, with Redemption, 3 Years | 253 |
| Expense Example, with Redemption, 5 Years | 440 |
| Expense Example, with Redemption, 10 Years | 980 |
| Class C | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 286 |
| Expense Example, with Redemption, 3 Years | 567 |
| Expense Example, with Redemption, 5 Years | 976 |
| Expense Example, with Redemption, 10 Years | 2,117 |
| Class A | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 601 |
| Expense Example, with Redemption, 3 Years | 815 |
| Expense Example, with Redemption, 5 Years | 1,047 |
| Expense Example, with Redemption, 10 Years | $ 1,712 |