v3.26.1
S000000856 [Member] Annual Fund Operating Expenses - Parnassus Core 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) 0.57%
Distribution and Service (12b-1) Fees 0.00%
Component1 Other Expenses 0.23%
Component2 Other Expenses 0.05%
Other Expenses (as a percentage of Assets): 0.28%
Expenses (as a percentage of Assets) 0.85%
Fee Waiver or Reimbursement 0.04%
Net Expenses (as a percentage of Assets) 0.81% [1]
Institutional Shares  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.57%
Distribution and Service (12b-1) Fees 0.00%
Component1 Other Expenses 0.00%
Component2 Other Expenses 0.04%
Other Expenses (as a percentage of Assets): 0.04%
Expenses (as a percentage of Assets) 0.61%
Fee Waiver or Reimbursement 0.00%
Net Expenses (as a percentage of Assets) 0.61% [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 0.81% of net assets for the Parnassus Core Equity Fund—Investor Shares and to 0.61% of net assets for the Parnassus Core 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.