S000001130 [Member] Annual Fund Operating Expenses - AMG River Road Small Cap Value Fund |
Oct. 31, 2025 |
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|---|---|---|---|---|
| Class N | ||||
| Prospectus [Line Items] | ||||
| Management Fees (as a percentage of Assets) | 0.80% | |||
| Distribution and Service (12b-1) Fees | 0.25% | |||
| Other Expenses (as a percentage of Assets): | 0.30% | [1] | ||
| Expenses (as a percentage of Assets) | 1.35% | |||
| Class I | ||||
| Prospectus [Line Items] | ||||
| Management Fees (as a percentage of Assets) | 0.80% | |||
| Distribution and Service (12b-1) Fees | 0.00% | |||
| Other Expenses (as a percentage of Assets): | 0.29% | [1] | ||
| Expenses (as a percentage of Assets) | 1.09% | |||
| Class Z | ||||
| Prospectus [Line Items] | ||||
| Management Fees (as a percentage of Assets) | 0.80% | |||
| Distribution and Service (12b-1) Fees | 0.00% | |||
| Other Expenses (as a percentage of Assets): | 0.20% | [1] | ||
| Expenses (as a percentage of Assets) | 1.00% | |||
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