S000030192 [Member] Expense Example - AMG GW&K Small/Mid Cap Growth Fund |
Oct. 31, 2025
USD ($)
|
|---|---|
| CLASS N SHARES | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 104 |
| Expense Example, with Redemption, 3 Years | 380 |
| Expense Example, with Redemption, 5 Years | 677 |
| Expense Example, with Redemption, 10 Years | 1,522 |
| CLASS I SHARES | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 89 |
| Expense Example, with Redemption, 3 Years | 333 |
| Expense Example, with Redemption, 5 Years | 597 |
| Expense Example, with Redemption, 10 Years | 1,351 |
| CLASS Z SHARES | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 84 |
| Expense Example, with Redemption, 3 Years | 318 |
| Expense Example, with Redemption, 5 Years | 570 |
| Expense Example, with Redemption, 10 Years | $ 1,294 |