S000009909 [Member] Expense Example - AMG River Road Large Cap Value Select Fund |
Oct. 31, 2025
USD ($)
|
|---|---|
| Class N | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 97 |
| Expense Example, with Redemption, 3 Years | 335 |
| Expense Example, with Redemption, 5 Years | 592 |
| Expense Example, with Redemption, 10 Years | 1,327 |
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 65 |
| Expense Example, with Redemption, 3 Years | 237 |
| Expense Example, with Redemption, 5 Years | 424 |
| Expense Example, with Redemption, 10 Years | $ 964 |