S000009909 [Member] Investment Objectives and Goals - AMG River Road Large Cap Value Select Fund |
Oct. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | AMG River Road Large Cap Value Select Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | AMG River Road Large Cap Value Select Fund's (the “Fund”) investment objective is to achieve long-term capital appreciation.
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