v3.26.1
S000000855 [Member] Annual Fund Operating Expenses - Parnassus Value Equity Fund
Dec. 31, 2025
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination May 1, 2027
Investor Shares  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.66%
Distribution and Service (12b-1) Fees 0.00%
Component1 Other Expenses 0.25%
Component2 Other Expenses 0.06%
Other Expenses (as a percentage of Assets): 0.31%
Expenses (as a percentage of Assets) 0.97%
Fee Waiver or Reimbursement 0.09%
Net Expenses (as a percentage of Assets) 0.88% [1]
Institutional Shares  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.66%
Distribution and Service (12b-1) Fees 0.00%
Component1 Other Expenses 0.00%
Component2 Other Expenses 0.06%
Other Expenses (as a percentage of Assets): 0.06%
Expenses (as a percentage of Assets) 0.72%
Fee Waiver or Reimbursement 0.07%
Net Expenses (as a percentage of Assets) 0.65% [1]
[1] The investment adviser has contractually agreed to reimburse the Fund for expenses to the extent necessary to limit total annual fund operating expenses to 0.88% of net assets for the Parnassus Value Equity Fund—Investor Shares and to 0.65% of net assets for the Parnassus Value Equity Fund—Institutional Shares. This agreement will not be terminated prior to May 1, 2027 and may be continued indefinitely by the investment adviser on a year‑to‑year basis.