S000000853 [Member] Expense Example - Parnassus Mid Cap Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Investor Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 97 |
| Expense Example, with Redemption, 3 Years | 320 |
| Expense Example, with Redemption, 5 Years | 561 |
| Expense Example, with Redemption, 10 Years | 1,252 |
| Institutional Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 77 |
| Expense Example, with Redemption, 3 Years | 244 |
| Expense Example, with Redemption, 5 Years | 426 |
| Expense Example, with Redemption, 10 Years | $ 952 |