S000000855 [Member] Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Parnassus Value Equity Fund | Investor Shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 19.04% | 12.01% | 13.70% | (13.81%) | 31.12% | 27.42% | 33.29% | (13.49%) | 19.81% | 21.42% |