S000000853 [Member] Investment Objectives and Goals - Parnassus Mid Cap Fund |
Dec. 31, 2025 |
|---|---|
| Prospectus [Line Items] | |
| Risk/Return [Heading] | Parnassus Mid Cap Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The Parnassus Mid Cap Fund has the overall investment objective of capital appreciation.
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