| Form N-CSR Cover | 12 Months Ended |
| Dec. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | PARNASSUS FUNDS |
| Entity Central Index Key | 0000747546 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Dec. 31, 2024 |
| Shareholder Report | 12 Months Ended | 24 Months Ended | 116 Months Ended |
| Dec. 31, 2024 USD ($) Holding | Dec. 31, 2024 USD ($) Holding | Dec. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |||
| Document Type | N-CSR | ||
| Amendment Flag | false | ||
| Registrant Name | PARNASSUS FUNDS | ||
| Entity Central Index Key | 0000747546 | ||
| Entity Investment Company Type | N-1A | ||
| Document Period End Date | Dec. 31, 2024 | ||
| C000240326 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | Parnassus Growth Equity Fund | ||
| Class Name | Investor Shares | ||
| Trading Symbol | PFGEX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of January 1, 2024 to December 31, 2024. | ||
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | ||
| Additional Information [Text Block] | You can find additional information about the fund at www.parnassus.com. You can also request this information by contacting us at 800-999-3505. | ||
| Additional Information Phone Number | 800-999-3505 | ||
| Additional Information Website | www.parnassus.com | ||
| Expenses [Text Block] | What was the Fund's cost for the year? (based on hypothetical $10,000 investment) Class name Cost of a $10,000 investment Cost paid as a % of a $10,000 investment Investor Shares $95 0.84% | ||
| Expenses Paid, Amount | $ 95 | ||
| Expense Ratio, Percent | 0.84% | ||
| Factors Affecting Performance [Text Block] | How did the fund perform? Parnassus Growth Equity Fund (Investor Shares) returned 26.85%, (net of fees) for the year, underperforming the Russell 1000 Growth Index’s 33.36%. Stock selection in the Information Technology, Consumer Discretionary and Communication Services sectors held back relative returns. Conversely, stock selection in the Health Care sector and both stock selection and an underweight in the Consumer Staples sector buoyed relative performance. We continue to maintain balanced portfolio positioning in favor of increasingly relevant, competitively advantaged businesses that are trading at attractive valuations. | ||
| Line Graph [Table Text Block] | Parnassus Growth Equity Fund S&P 500 Index Russell 1000 ® Dec-22 $10,000 $10,000 $10,000 Dec-22 $9,960 $10,151 $10,194 Mar-23 $11,507 $10,912 $11,659 Jun-23 $12,813 $11,866 $13,152 Sep-23 $12,507 $11,477 $12,741 Dec-23 $14,434 $12,819 $14,545 Mar-24 $16,298 $14,172 $16,205 Jun-24 $16,908 $14,779 $17,556 Sep-24 $17,463 $15,649 $18,116 Dec-24 $18,310 $16,026 $19,397 | ||
| Average Annual Return [Table Text Block] | 1 Year Since Inception Parnassus Growth Equity Fund - Investor Shares (Incp: December 28, 2022) 26.85% 35.15% S&P 500 Index 25.02% 26.47% Russell 1000 ® 33.36% 39.08% | ||
| Performance Inception Date | Dec. 28, 2022 | ||
| AssetsNet | $ 63,702,581 | $ 63,702,581 | $ 63,702,581 |
| Holdings Count | Holding | 42 | 42 | 42 |
| Advisory Fees Paid, Amount | $ 85,796 | ||
| InvestmentCompanyPortfolioTurnover | 34.89% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $63,702,581 # of Portfolio Holdings 42 Portfolio Turnover Rate 34.89% Advisory Fees Paid $85,796 | ||
| Holdings [Text Block] | Sector Allocation (%)* Value Value Short-Term Investments, Other Assets & Liabilities 0.9% Real Estate 1.2% Consumer Staples 2.0% Materials 2.8% Industrials 3.8% Communication Services 8.0% Consumer Discretionary 10.2% Financials 11.1% Health Care 12.8% Information Technology 47.2% | ||
| Largest Holdings [Text Block] | Top Ten Holdings (%)* Microsoft Corp. 9.0% NVIDIA Corp. 8.9% Alphabet Inc., Class A 6.4% Amazon.com Inc. 4.8% Apple Inc. 4.8% Broadcom Inc. 4.8% Visa Inc., Class A 4.6% Salesforce Inc. 3.2% Eli Lilly & Co. 2.9% Natera Inc. 2.4% | ||
| Material Fund Change [Text Block] | Material Fund Changes No material changes to the Fund in the last reporting year. | ||
| C000240327 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | Parnassus Growth Equity Fund | ||
| Class Name | Institutional Shares | ||
| Trading Symbol | PFPGX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of January 1, 2024 to December 31, 2024. | ||
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | ||
| Additional Information [Text Block] | You can find additional information about the fund at www.parnassus.com. You can also request this information by contacting us at 800-999-3505. | ||
| Additional Information Phone Number | 800-999-3505 | ||
| Additional Information Website | www.parnassus.com | ||
| Expenses [Text Block] | What was the Fund's cost for the year? (based on hypothetical $10,000 investment) Class name Cost of a $10,000 investment Cost paid as a % of a $10,000 investment Institutional Shares $72 0.63% | ||
| Expenses Paid, Amount | $ 72 | ||
| Expense Ratio, Percent | 0.63% | ||
| Factors Affecting Performance [Text Block] | How did the fund perform? Parnassus Growth Equity Fund (Institutional Shares) returned 27.13%, (net of fees) for the year, underperforming the Russell 1000 Growth Index’s 33.36%. Stock selection in the Information Technology, Consumer Discretionary and Communication Services sectors held back relative returns. Conversely, stock selection in the Health Care sector and both stock selection and an underweight in the Consumer Staples sector buoyed relative performance. We continue to maintain balanced portfolio positioning in favor of increasingly relevant, competitively advantaged businesses that are trading at attractive valuations. | ||
| Line Graph [Table Text Block] | Parnassus Growth Equity Fund S&P 500 Index Russell 1000 ® Dec-22 $10,000 $10,000 $10,000 Dec-22 $9,960 $10,151 $10,194 Mar-23 $11,513 $10,912 $11,659 Jun-23 $12,827 $11,866 $13,152 Sep-23 $12,527 $11,477 $12,741 Dec-23 $14,460 $12,819 $14,545 Mar-24 $16,341 $14,172 $16,205 Jun-24 $16,959 $14,779 $17,556 Sep-24 $17,536 $15,649 $18,116 Dec-24 $18,384 $16,026 $19,397 | ||
| Average Annual Return [Table Text Block] | 1 Year Since Inception Parnassus Growth Equity Fund - Institutional Shares (Incp: December 28, 2022) 27.13% 35.42% S&P 500 Index 25.02% 26.47% Russell 1000 ® 33.36% 39.08% | ||
| Performance Inception Date | Dec. 28, 2022 | ||
| AssetsNet | $ 63,702,581 | $ 63,702,581 | $ 63,702,581 |
| Holdings Count | Holding | 42 | 42 | 42 |
| Advisory Fees Paid, Amount | $ 85,796 | ||
| InvestmentCompanyPortfolioTurnover | 34.89% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $63,702,581 # of Portfolio Holdings 42 Portfolio Turnover Rate 34.89% Advisory Fees Paid $85,796 | ||
| Holdings [Text Block] | Sector Allocation (%)* Value Value Short-Term Investments, Other Assets & Liabilities 0.9% Real Estate 1.2% Consumer Staples 2.0% Materials 2.8% Industrials 3.8% Communication Services 8.0% Consumer Discretionary 10.2% Financials 11.1% Health Care 12.8% Information Technology 47.2% | ||
| Largest Holdings [Text Block] | Top Ten Holdings (%)* Microsoft Corp. 9.0% NVIDIA Corp. 8.9% Alphabet Inc., Class A 6.4% Amazon.com Inc. 4.8% Apple Inc. 4.8% Broadcom Inc. 4.8% Visa Inc., Class A 4.6% Salesforce Inc. 3.2% Eli Lilly & Co. 2.9% Natera Inc. 2.4% | ||
| Material Fund Change [Text Block] | Material Fund Changes No material changes to the Fund in the last reporting year. | ||
| C000002470 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | Parnassus Value Equity Fund | ||
| Class Name | Investor Shares | ||
| Trading Symbol | PARWX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of January 1, 2024 to December 31, 2024. | ||
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | ||
| Additional Information [Text Block] | You can find additional information about the fund at www.parnassus.com. You can also request this information by contacting us at 800-999-3505. | ||
| Additional Information Phone Number | 800-999-3505 | ||
| Additional Information Website | www.parnassus.com | ||
| Expenses [Text Block] | What was the Fund's cost for the year? (based on hypothetical $10,000 investment) Class name Cost of a $10,000 investment Cost paid as a % of a $10,000 investment Investor Shares $93 0.88% | ||
| Expenses Paid, Amount | $ 93 | ||
| Expense Ratio, Percent | 0.88% | ||
| Factors Affecting Performance [Text Block] | How did the fund perform? Parnassus Value Equity Fund (Investor Shares) returned 12.01% (net of fees), trailing the Russell 1000 Value Index’s 14.37% for the year. Stock selection in the Health Care sector notably weighed on relative performance. In contrast, strong stock selection in Real Estate boosted relative returns. A continuation of the shift in investor sentiment toward more economically sensitive sectors could support a broadening of the stock market rally, especially in value stocks. | ||
| Line Graph [Table Text Block] | Parnassus Value Equity Fund S&P 500 Index Russell 1000 ® 2014 $10,000 $10,000 $10,000 2015 $10,325 $10,138 $9,617 2016 $12,536 $11,351 $11,285 2017 $15,019 $13,829 $12,827 2018 $12,994 $13,223 $11,767 2019 $17,319 $17,386 $14,890 2020 $22,068 $20,585 $15,306 2021 $28,936 $26,494 $19,157 2022 $24,939 $21,696 $17,713 2023 $28,355 $27,399 $19,743 2024 $31,760 $34,254 $22,580 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 years 10 Years Parnassus Value Equity Fund - Investor Shares 12.01% 12.89% 12.25% S&P 500 Index 25.02% 14.53% 13.10% Russell 1000 ® 14.37% 8.68% 8.49% | ||
| AssetsNet | $ 4,825,190,926 | $ 4,825,190,926 | $ 4,825,190,926 |
| Holdings Count | Holding | 45 | 45 | 45 |
| Advisory Fees Paid, Amount | $ 31,176,918 | ||
| InvestmentCompanyPortfolioTurnover | 24.08% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $4,825,190,926 # of Portfolio Holdings 45 Portfolio Turnover Rate 24.08% Advisory Fees Paid $31,176,918 | ||
| Holdings [Text Block] | Sector Allocation (%)* Value Value Short-Term Investments, Other Assets & Liabilities 0.6% Utilities 1.5% Materials 2.6% Consumer Staples 3.2% Real Estate 5.7% Communication Services 7.2% Consumer Discretionary 8.7% Industrials 9.9% Information Technology 16.6% Health Care 18.5% Financials 25.5% | ||
| Largest Holdings [Text Block] | Top Ten Holdings (%)* S&P Global Inc. 3.5% Bank of America Corp. 3.3% Sysco Corp. 3.2% CBRE Group Inc., Class A 3.2% Deere & Co. 3.1% Verizon Communications Inc. 2.9% Mastercard Inc., Class A 2.9% Broadcom Inc. 2.8% Alphabet Inc., Class A 2.8% Cummins Inc. 2.7% | ||
| Material Fund Change [Text Block] | Material Fund Changes No material changes to the Fund in the last reporting year. | ||
| C000156024 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | Parnassus Value Equity Fund | ||
| Class Name | Institutional Shares | ||
| Trading Symbol | PFPWX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of January 1, 2024 to December 31, 2024. | ||
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | ||
| Additional Information [Text Block] | You can find additional information about the fund at www.parnassus.com. You can also request this information by contacting us at 800-999-3505. | ||
| Additional Information Phone Number | 800-999-3505 | ||
| Additional Information Website | www.parnassus.com | ||
| Expenses [Text Block] | What was the Fund's cost for the year? (based on hypothetical $10,000 investment) Class name Cost of a $10,000 investment Cost paid as a % of a $10,000 investment Institutional Shares $69 0.65% | ||
| Expenses Paid, Amount | $ 69 | ||
| Expense Ratio, Percent | 0.65% | ||
| Factors Affecting Performance [Text Block] | How did the fund perform? Parnassus Value Equity Fund (Institutional Shares) returned 12.27% (net of fees), trailing the Russell 1000 Value Index’s 14.37% for the year. Stock selection in the Health Care sector notably weighed on relative performance. In contrast, strong stock selection in Real Estate boosted relative returns. A continuation of the shift in investor sentiment toward more economically sensitive sectors could support a broadening of the stock market rally, especially in value stocks. | ||
| Line Graph [Table Text Block] | Parnassus Value Equity Fund S&P 500 Index Russell 1000 ® 2015 $10,000 $10,000 $10,000 2015 $9,978 $9,947 $9,597 2016 $12,141 $11,137 $11,262 2017 $14,573 $13,569 $12,801 2018 $12,642 $12,974 $11,742 2019 $16,885 $17,059 $14,859 2020 $21,565 $20,197 $15,274 2021 $28,330 $25,995 $19,117 2022 $24,476 $21,287 $17,676 2023 $27,888 $26,883 $19,703 2024 $31,309 $33,609 $22,533 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 years Since Inception Parnassus Value Equity Fund - Institutional Shares (Incp: April 30, 2015) 12.27% 13.14% 12.53% S&P 500 Index 25.02% 14.53% 13.36% Russell 1000 ® 14.37% 8.68% 8.76% | ||
| Performance Inception Date | Apr. 30, 2015 | ||
| AssetsNet | $ 4,825,190,926 | $ 4,825,190,926 | $ 4,825,190,926 |
| Holdings Count | Holding | 45 | 45 | 45 |
| Advisory Fees Paid, Amount | $ 31,176,918 | ||
| InvestmentCompanyPortfolioTurnover | 24.08% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $4,825,190,926 # of Portfolio Holdings 45 Portfolio Turnover Rate 24.08% Advisory Fees Paid $31,176,918 | ||
| Holdings [Text Block] | Sector Allocation (%)* Value Value Short-Term Investments, Other Assets & Liabilities 0.6% Utilities 1.5% Materials 2.6% Consumer Staples 3.2% Real Estate 5.7% Communication Services 7.2% Consumer Discretionary 8.7% Industrials 9.9% Information Technology 16.6% Health Care 18.5% Financials 25.5% | ||
| Largest Holdings [Text Block] | Top Ten Holdings (%)* S&P Global Inc. 3.5% Bank of America Corp. 3.3% Sysco Corp. 3.2% CBRE Group Inc., Class A 3.2% Deere & Co. 3.1% Verizon Communications Inc. 2.9% Mastercard Inc., Class A 2.9% Broadcom Inc. 2.8% Alphabet Inc., Class A 2.8% Cummins Inc. 2.7% | ||
| Material Fund Change [Text Block] | Material Fund Changes No material changes to the Fund in the last reporting year. | ||
| C000002468 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | Parnassus Mid Cap Fund | ||
| Class Name | Investor Shares | ||
| Trading Symbol | PARMX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of January 1, 2024 to December 31, 2024. | ||
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | ||
| Additional Information [Text Block] | You can find additional information about the fund at www.parnassus.com. You can also request this information by contacting us at 800-999-3505. | ||
| Additional Information Phone Number | 800-999-3505 | ||
| Additional Information Website | www.parnassus.com | ||
| Expenses [Text Block] | What was the Fund's cost for the year? (based on hypothetical $10,000 investment) Class name Cost of a $10,000 investment Cost paid as a % of a $10,000 investment Investor Shares $100 0.95% | ||
| Expenses Paid, Amount | $ 100 | ||
| Expense Ratio, Percent | 0.95% | ||
| Factors Affecting Performance [Text Block] | How did the fund perform? The Parnassus Mid Cap Fund (Investor shares) returned 9.99% (net of fees) in 2024, underperforming the Russell Midcap Index’s 15.34% return. Stock selection within Communication Services and Real Estate contributed to relative performance, while selection within Industrials and Information Technology detracted. Our disciplined approach—emphasizing quality, financial strength, and attractive valuations—positions the Fund to help protect capital during downturns while capturing upside in favorable markets. | ||
| Line Graph [Table Text Block] | Parnassus Mid Cap Fund Russell 1000 ® Russell Midcap Index 2014 $10,000 $10,000 $10,000 2015 $9,913 $10,092 $9,756 2016 $11,507 $11,308 $11,102 2017 $13,324 $13,761 $13,158 2018 $12,440 $13,102 $11,966 2019 $16,016 $17,220 $15,621 2020 $18,399 $20,830 $18,292 2021 $21,416 $26,340 $22,424 2022 $16,798 $21,302 $18,541 2023 $18,927 $26,953 $21,735 2024 $20,818 $33,560 $25,070 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 years 10 Years Parnassus Mid Cap Fund - Investor Shares 9.99% 5.38% 7.61% Russell 1000 ® 24.51% 14.28% 12.87% Russell Midcap Index 15.34% 9.92% 9.63% | ||
| AssetsNet | $ 2,842,441,773 | $ 2,842,441,773 | $ 2,842,441,773 |
| Holdings Count | Holding | 38 | 38 | 38 |
| Advisory Fees Paid, Amount | $ 23,536,822 | ||
| InvestmentCompanyPortfolioTurnover | 43.55% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $2,842,441,773 # of Portfolio Holdings 38 Portfolio Turnover Rate 43.55% Advisory Fees Paid $23,536,822 | ||
| Holdings [Text Block] | Sector Allocation (%)* Value Value Short-Term Investments, Other Assets & Liabilities 0.8% Utilities 1.2% Communication Services 2.7% Materials 3.5% Real Estate 5.5% Health Care 6.5% Consumer Discretionary 11.8% Financials 19.4% Information Technology 23.8% Industrials 24.8% | ||
| Largest Holdings [Text Block] | Top Ten Holdings (%)* Fidelity National Information Services 4.0% TransUnion 3.8% CBRE Group Inc., Class A 3.7% Fortinet Inc. 3.7% J.B. Hunt Transport Services Inc. 3.6% Cboe Global Markets Inc. 3.5% The Bank of New York Mellon Corp. 3.4% Roper Technologies Inc. 3.3% Truist Financial Corp. 3.3% Republic Services Inc. 3.1% | ||
| Material Fund Change [Text Block] | Material Fund Changes No material changes to the Fund in the last reporting year. | ||
| C000156023 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | Parnassus Mid Cap Fund | ||
| Class Name | Institutional Shares | ||
| Trading Symbol | PFPMX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of January 1, 2024 to December 31, 2024. | ||
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | ||
| Additional Information [Text Block] | You can find additional information about the fund at www.parnassus.com. You can also request this information by contacting us at 800-999-3505. | ||
| Additional Information Phone Number | 800-999-3505 | ||
| Additional Information Website | www.parnassus.com | ||
| Expenses [Text Block] | What was the Fund's cost for the year? (based on hypothetical $10,000 investment) Class name Cost of a $10,000 investment Cost paid as a % of a $10,000 investment Institutional Shares $79 0.75% | ||
| Expenses Paid, Amount | $ 79 | ||
| Expense Ratio, Percent | 0.75% | ||
| Factors Affecting Performance [Text Block] | How did the fund perform? The Parnassus Mid Cap Fund (Institutional shares) returned 10.21% (net of fees) in 2024, underperforming the Russell Midcap Index’s 15.34% return. Stock selection within Communication Services and Real Estate contributed to relative performance, while selection within Industrials and Information Technology detracted. Our disciplined approach—emphasizing quality, financial strength, and attractive valuations—positions the Fund to help protect capital during downturns while capturing upside in favorable markets. | ||
| Line Graph [Table Text Block] | Parnassus Mid Cap Fund Russell 1000 ® Russell Midcap Index 2015 $10,000 $10,000 $10,000 2015 $9,870 $9,864 $9,471 2016 $11,477 $11,053 $10,778 2017 $13,318 $13,450 $12,774 2018 $12,467 $12,806 $11,617 2019 $16,084 $16,831 $15,165 2020 $18,523 $20,359 $17,758 2021 $21,605 $25,745 $21,769 2022 $16,979 $20,821 $18,000 2023 $19,172 $26,344 $21,100 2024 $21,131 $32,801 $24,338 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 years Since Inception Parnassus Mid Cap Fund - Institutional Shares (Incp: April 30, 2015) 10.21% 5.61% 8.04% Russell 1000 ® 24.51% 14.28% 13.07% Russell Midcap Index 15.34% 9.92% 9.64% | ||
| Performance Inception Date | Apr. 30, 2015 | ||
| AssetsNet | $ 2,842,441,773 | $ 2,842,441,773 | $ 2,842,441,773 |
| Holdings Count | Holding | 38 | 38 | 38 |
| Advisory Fees Paid, Amount | $ 23,536,822 | ||
| InvestmentCompanyPortfolioTurnover | 43.55% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $2,842,441,773 # of Portfolio Holdings 38 Portfolio Turnover Rate 43.55% Advisory Fees Paid $23,536,822 | ||
| Holdings [Text Block] | Sector Allocation (%)* Value Value Short-Term Investments, Other Assets & Liabilities 0.8% Utilities 1.2% Communication Services 2.7% Materials 3.5% Real Estate 5.5% Health Care 6.5% Consumer Discretionary 11.8% Financials 19.4% Information Technology 23.8% Industrials 24.8% | ||
| Largest Holdings [Text Block] | Top Ten Holdings (%)* Fidelity National Information Services 4.0% TransUnion 3.8% CBRE Group Inc., Class A 3.7% Fortinet Inc. 3.7% J.B. Hunt Transport Services Inc. 3.6% Cboe Global Markets Inc. 3.5% The Bank of New York Mellon Corp. 3.4% Roper Technologies Inc. 3.3% Truist Financial Corp. 3.3% Republic Services Inc. 3.1% | ||
| Material Fund Change [Text Block] | Material Fund Changes No material changes to the Fund in the last reporting year. | ||
| C000002467 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | Parnassus Mid Cap Growth Fund | ||
| Class Name | Investor Shares | ||
| Trading Symbol | PARNX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of January 1, 2024 to December 31, 2024. | ||
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | ||
| Additional Information [Text Block] | You can find additional information about the fund at www.parnassus.com. You can also request this information by contacting us at 800-999-3505. | ||
| Additional Information Phone Number | 800-999-3505 | ||
| Additional Information Website | www.parnassus.com | ||
| Expenses [Text Block] | What was the Fund's cost for the year? (based on hypothetical $10,000 investment) Class name Cost of a $10,000 investment Cost paid as a % of a $10,000 investment Investor Shares $84 0.80% | ||
| Expenses Paid, Amount | $ 84 | ||
| Expense Ratio, Percent | 0.80% | ||
| Factors Affecting Performance [Text Block] | How did the fund perform? The Parnassus Mid Cap Growth Fund (Investor shares) returned 10.55% (net of fees) in 2024, underperforming the Russell Midcap Growth Index’s 22.10% return. A lack of exposure to Consumer Staples and stock selection within Communication Services contributed while stock selection within Information Technology and Consumer Discretionary detracted. Our disciplined approach—emphasizing quality, financial strength, and attractive valuations—positions the Fund to help protect capital during downturns while capturing upside in favorable markets. | ||
| Line Graph [Table Text Block] | Parnassus Mid Cap Growth Fund Russell 1000 ® Russell Midcap Growth Index 2014 $10,000 $10,000 $10,000 2015 $10,026 $10,092 $9,980 2016 $11,375 $11,308 $10,711 2017 $13,204 $13,761 $13,418 2018 $11,919 $13,102 $12,780 2019 $15,474 $17,220 $17,312 2020 $19,900 $20,830 $23,473 2021 $21,764 $26,340 $26,461 2022 $14,468 $21,302 $19,390 2023 $19,620 $26,953 $24,411 2024 $21,689 $33,560 $29,807 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 years 10 Years Parnassus Mid Cap Growth Fund - Investor Shares 10.55% 6.99% 8.05% Russell 1000 ® 24.51% 14.28% 12.87% Russell Midcap Growth Index 22.10% 11.48% 11.54% | ||
| AssetsNet | $ 841,960,290 | $ 841,960,290 | $ 841,960,290 |
| Holdings Count | Holding | 37 | 37 | 37 |
| Advisory Fees Paid, Amount | $ 5,159,334 | ||
| InvestmentCompanyPortfolioTurnover | 41.45% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $841,960,290 # of Portfolio Holdings 37 Portfolio Turnover Rate 41.45% Advisory Fees Paid $5,159,334 | ||
| Holdings [Text Block] | Sector Allocation (%)* Value Value Short-Term Investments, Other Assets & Liabilities 0.7% Communication Services 2.9% Materials 2.9% Financials 8.4% Health Care 11.7% Consumer Discretionary 13.7% Industrials 24.5% Information Technology 35.2% | ||
| Largest Holdings [Text Block] | Top Ten Holdings (%)* Equifax Inc. 4.4% Old Dominion Freight Line Inc. 4.0% J.B. Hunt Transport Services Inc. 4.0% Trane Technologies plc 3.9% Atlassian Corp., Class A 3.7% Teradyne Inc. 3.6% MercadoLibre Inc. 3.4% Block Inc., Class A 3.2% Workday Inc., Class A 3.2% Hilton Worldwide Holdings Inc. 3.1% | ||
| Material Fund Change [Text Block] | Material Fund Changes No material changes to the Fund in the last reporting year. | ||
| C000156022 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | Parnassus Mid Cap Growth Fund | ||
| Class Name | Institutional Shares | ||
| Trading Symbol | PFPRX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Fund for the period of January 1, 2024 to December 31, 2024. | ||
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | ||
| Additional Information [Text Block] | You can find additional information about the fund at www.parnassus.com. You can also request this information by contacting us at 800-999-3505. | ||
| Additional Information Phone Number | 800-999-3505 | ||
| Additional Information Website | www.parnassus.com | ||
| Expenses [Text Block] | What was the Fund's cost for the year? (based on hypothetical $10,000 investment) Class name Cost of a $10,000 investment Cost paid as a % of a $10,000 investment Institutional Shares $72 0.68% | ||
| Expenses Paid, Amount | $ 72 | ||
| Expense Ratio, Percent | 0.68% | ||
| Factors Affecting Performance [Text Block] | How did the fund perform? The Parnassus Mid Cap Growth Fund (Institutional shares) returned 10.68% (net of fees) in 2024, underperforming the Russell Midcap Growth Index’s 22.10% return. A lack of exposure to Consumer Staples and stock selection within Communication Services contributed while stock selection within Information Technology and Consumer Discretionary detracted. Our disciplined approach—emphasizing quality, financial strength, and attractive valuations—positions the Fund to help protect capital during downturns while capturing upside in favorable markets. | ||
| Line Graph [Table Text Block] | Parnassus Mid Cap Growth Fund Russell 1000 ® Russell Midcap Growth Index 2015 $10,000 $10,000 $10,000 2015 $9,763 $9,864 $9,538 2016 $11,089 $11,053 $10,237 2017 $12,891 $13,450 $12,823 2018 $11,658 $12,806 $12,213 2019 $15,152 $16,831 $16,545 2020 $19,517 $20,359 $22,432 2021 $21,373 $25,745 $25,288 2022 $14,224 $20,821 $18,531 2023 $19,311 $26,344 $23,329 2024 $21,373 $32,801 $28,485 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 years Since Inception Parnassus Mid Cap Growth Fund - Institutional Shares (Incp: April 30, 2015) 10.68% 7.12% 8.17% Russell 1000 ® 24.51% 14.28% 13.07% Russell Midcap Growth Index 22.10% 11.48% 11.43% | ||
| Performance Inception Date | Apr. 30, 2015 | ||
| AssetsNet | $ 841,960,290 | $ 841,960,290 | $ 841,960,290 |
| Holdings Count | Holding | 37 | 37 | 37 |
| Advisory Fees Paid, Amount | $ 5,159,334 | ||
| InvestmentCompanyPortfolioTurnover | 41.45% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $841,960,290 # of Portfolio Holdings 37 Portfolio Turnover Rate 41.45% Advisory Fees Paid $5,159,334 | ||
| Holdings [Text Block] | Sector Allocation (%)* Value Value Short-Term Investments, Other Assets & Liabilities 0.7% Communication Services 2.9% Materials 2.9% Financials 8.4% Health Care 11.7% Consumer Discretionary 13.7% Industrials 24.5% Information Technology 35.2% | ||
| Largest Holdings [Text Block] | Top Ten Holdings (%)* Equifax Inc. 4.4% Old Dominion Freight Line Inc. 4.0% J.B. Hunt Transport Services Inc. 4.0% Trane Technologies plc 3.9% Atlassian Corp., Class A 3.7% Teradyne Inc. 3.6% MercadoLibre Inc. 3.4% Block Inc., Class A 3.2% Workday Inc., Class A 3.2% Hilton Worldwide Holdings Inc. 3.1% | ||
| Material Fund Change [Text Block] | Material Fund Changes No material changes to the Fund in the last reporting year. |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 24 Months Ended | 60 Months Ended | 116 Months Ended | 120 Months Ended |
| Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | |
| Without Sales Load [Member] | C000240326 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 26.85% | 35.15% | |||
| Without Sales Load [Member] | C000240327 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 27.13% | 35.42% | |||
| Without Sales Load [Member] | C000002470 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 12.01% | 12.89% | 12.25% | ||
| Without Sales Load [Member] | C000156024 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 12.27% | 13.14% | 12.53% | ||
| Without Sales Load [Member] | C000002468 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 9.99% | 5.38% | 7.61% | ||
| Without Sales Load [Member] | C000156023 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 10.21% | 5.61% | 8.04% | ||
| Without Sales Load [Member] | C000002467 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 10.55% | 6.99% | 8.05% | ||
| Without Sales Load [Member] | C000156022 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 10.68% | 7.12% | 8.17% | ||
| S&P 500 Index | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 25.02% | 26.47% | |||
| S&P 500 Index | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 25.02% | 26.47% | |||
| S&P 500 Index | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 25.02% | 14.53% | 13.10% | ||
| S&P 500 Index | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 25.02% | 14.53% | 13.36% | ||
| Russell 1000® Index | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 24.51% | 14.28% | 12.87% | ||
| Russell 1000® Index | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 24.51% | 14.28% | 13.07% | ||
| Russell 1000® Index | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 24.51% | 14.28% | 12.87% | ||
| Russell 1000® Index | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 24.51% | 14.28% | 13.07% |
| Shareholder Report, Holdings (Details) | Dec. 31, 2024 |
| C000240326 | 35915835Microsoft Corp. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| C000240326 | 35915871NVIDIA Corp. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000240326 | 35915541Alphabet Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| C000240326 | 35915555Amazon.com Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000240326 | 35915569Apple Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000240326 | 35915639Broadcom Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000240326 | 35915970Visa Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000240326 | 35915913Salesforce Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000240326 | 35915800Eli Lilly & Co. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000240326 | 35915847Natera Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000240326 | Real Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000240326 | Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000240326 | Materials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000240326 | Industrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000240326 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| C000240326 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| C000240326 | Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| C000240326 | Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| C000240326 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.20% |
| C000240327 | 35915835Microsoft Corp. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| C000240327 | 35915871NVIDIA Corp. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000240327 | 35915541Alphabet Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| C000240327 | 35915555Amazon.com Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000240327 | 35915569Apple Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000240327 | 35915639Broadcom Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| C000240327 | 35915970Visa Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000240327 | 35915913Salesforce Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000240327 | 35915800Eli Lilly & Co. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000240327 | 35915847Natera Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000240327 | Real Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000240327 | Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000240327 | Materials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000240327 | Industrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000240327 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| C000240327 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| C000240327 | Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| C000240327 | Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| C000240327 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.20% |
| C000002470 | 35831820S&P Global Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000002470 | 35831637Bank of America Corp. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000002470 | 35831839Sysco Corp. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000002470 | 35831678CBRE Group Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000002470 | 35831726Deere & Co. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000002470 | 35831868Verizon Communications Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000002470 | 35831760Mastercard Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000002470 | 35831662Broadcom Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000002470 | 35831603Alphabet Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000002470 | 35831712Cummins Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000002470 | Real Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| C000002470 | Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000002470 | Materials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000002470 | Industrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| C000002470 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| C000002470 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000002470 | Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.50% |
| C000002470 | Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.50% |
| C000002470 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.60% |
| C000002470 | Utilities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000156024 | 35831820S&P Global Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000156024 | 35831637Bank of America Corp. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000156024 | 35831839Sysco Corp. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000156024 | 35831678CBRE Group Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000156024 | 35831726Deere & Co. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000156024 | 35831868Verizon Communications Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000156024 | 35831760Mastercard Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000156024 | 35831662Broadcom Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000156024 | 35831603Alphabet Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000156024 | 35831712Cummins Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000156024 | Real Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| C000156024 | Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000156024 | Materials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000156024 | Industrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| C000156024 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| C000156024 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000156024 | Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.50% |
| C000156024 | Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.50% |
| C000156024 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.60% |
| C000156024 | Utilities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000002468 | 35832097Fidelity National Information Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000002468 | 35832179TransUnion | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000002468 | 35832083CBRE Group Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000002468 | 35832101Fortinet Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000002468 | 35832116J.B. Hunt Transport Services Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000002468 | 35832079Cboe Global Markets Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000002468 | 35832062The Bank of New York Mellon Corp. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000002468 | 35832161Roper Technologies Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000002468 | 35832185Truist Financial Corp. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000002468 | 35832157Republic Services Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000002468 | Real Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| C000002468 | Materials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000002468 | Industrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.80% |
| C000002468 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000002468 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.80% |
| C000002468 | Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.40% |
| C000002468 | Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000002468 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| C000002468 | Utilities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000156023 | 35832097Fidelity National Information Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000156023 | 35832179TransUnion | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000156023 | 35832083CBRE Group Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000156023 | 35832101Fortinet Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000156023 | 35832116J.B. Hunt Transport Services Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000156023 | 35832079Cboe Global Markets Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000156023 | 35832062The Bank of New York Mellon Corp. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000156023 | 35832161Roper Technologies Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000156023 | 35832185Truist Financial Corp. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000156023 | 35832157Republic Services Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000156023 | Real Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| C000156023 | Materials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000156023 | Industrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.80% |
| C000156023 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000156023 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.80% |
| C000156023 | Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.40% |
| C000156023 | Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000156023 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.80% |
| C000156023 | Utilities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000002467 | 35831171Equifax Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000002467 | 35831261Old Dominion Freight Line Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000002467 | 35831203J.B. Hunt Transport Services Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000002467 | 35831376Trane Technologies plc | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000002467 | 35831122Atlassian Corp., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000002467 | 35831330Teradyne Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000002467 | 35831227MercadoLibre Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000002467 | 35831323Block Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000002467 | 35831369Workday Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000002467 | 35831197Hilton Worldwide Holdings Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000002467 | Materials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000002467 | Industrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.50% |
| C000002467 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000002467 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.70% |
| C000002467 | Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| C000002467 | Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| C000002467 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.20% |
| C000156022 | 35831171Equifax Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000156022 | 35831261Old Dominion Freight Line Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000156022 | 35831203J.B. Hunt Transport Services Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000156022 | 35831376Trane Technologies plc | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000156022 | 35831122Atlassian Corp., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000156022 | 35831330Teradyne Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000156022 | 35831227MercadoLibre Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| C000156022 | 35831323Block Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000156022 | 35831369Workday Inc., Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000156022 | 35831197Hilton Worldwide Holdings Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000156022 | Materials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000156022 | Industrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.50% |
| C000156022 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000156022 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.70% |
| C000156022 | Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| C000156022 | Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| C000156022 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.20% |
