Class Z [Member] Investment Objectives and Goals - Class Z Shares - International Small Cap Portfolio |
Sep. 30, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | International Small Cap Portfolio of Bernstein Fund, Inc. |
| Objective [Heading] | INVESTMENT OBJECTIVE: |
| Objective, Primary [Text Block] |
The Portfolio’s investment objective is to provide long-term growth of capital.
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