v3.26.1
Shareholder Report
 6 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Driehaus Mutual Funds
Entity Central Index Key 0001016073
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
Driehaus Emerging Markets Growth Fund - Institutional Class  
Shareholder Report [Line Items]  
Fund Name Driehaus Emerging Markets Growth Fund
Class Name Institutional Class
Trading Symbol DIEMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Driehaus Emerging Markets Growth Fund's Institutional Class (“Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund atwww.driehaus.com/fund-resources. You can also request this information by contacting us at 1-800-560-6111.
Additional Information Phone Number 1-800-560-6111
Additional Information Website www.driehaus.com/fund-resources
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class)
Cost of a $10,000 Investment
Costs paid as a percentage of a $10,000 investment
Driehaus Emerging Markets Growth Fund (Institutional Class/DIEMX)
$
47		0.83
%
*
*
Annualized.
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.83% [1]
Net Assets $ 5,085,811,838
Holdings Count | Holding 92
Investment Company, Portfolio Turnover 57.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
5,085,811,838
Total number of portfolio holdings
92
Portfolio turnover rate as of the end of the reporting period (not annualized)
57
%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of total
 
net assets of the Fund.
TOP TEN HOLDINGS
Taiwan Semiconductor Manufacturing Co. Ltd.9.8
%
Samsung Electronics Co. Ltd.8.7
%
SK hynix, Inc.6.7
%
Northern Institutional U.S. Government Select Portfolio (Shares Class), 3.53%5.4
%
Taiwan Semiconductor Manufacturing Co. Ltd. - SP ADR3.7
%
Tencent Holdings Ltd.2.8
%
ASE Technology Holding Co. Ltd.2.7
%
OTP Bank Nyrt.1.7
%
CTBC Financial Holding Co. Ltd.1.7
%
Credicorp Ltd.1.7
%
INDUSTRY SECTOR ALLOCATION
Graphical Representation - Allocation 1 Chart
GEOGRAPHIC ALLOCATION
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
TOP TEN HOLDINGS
Taiwan Semiconductor Manufacturing Co. Ltd.9.8
%
Samsung Electronics Co. Ltd.8.7
%
SK hynix, Inc.6.7
%
Northern Institutional U.S. Government Select Portfolio (Shares Class), 3.53%5.4
%
Taiwan Semiconductor Manufacturing Co. Ltd. - SP ADR3.7
%
Tencent Holdings Ltd.2.8
%
ASE Technology Holding Co. Ltd.2.7
%
OTP Bank Nyrt.1.7
%
CTBC Financial Holding Co. Ltd.1.7
%
Credicorp Ltd.1.7
%
Driehaus Emerging Markets Growth Fund - Investor Class  
Shareholder Report [Line Items]  
Fund Name Driehaus Emerging Markets Growth Fund
Class Name Investor Class
Trading Symbol DREGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Driehaus Emerging Markets Growth Fund's Investor Class (“Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund atwww.driehaus.com/fund-resources. You can also request this information by contacting us at 1-800-560-6111.
Additional Information Phone Number 1-800-560-6111
Additional Information Website www.driehaus.com/fund-resources
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class)
Cost of a $10,000 Investment
Costs paid as a percentage of a $10,000 investment
Driehaus Emerging Markets Growth Fund (Investor Class/DREGX)
$
60		1.06
%
*
*
Annualized.
Expenses Paid, Amount $ 60
Expense Ratio, Percent 1.06% [1]
Net Assets $ 5,085,811,838
Holdings Count | Holding 92
Investment Company, Portfolio Turnover 57.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
5,085,811,838
Total number of portfolio holdings
92
Portfolio turnover rate as of the end of the reporting period (not annualized)
57
%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing perc
en
tage of
to
tal
 
net a
ssets
of the Fund.
TOP TEN HOLDINGS
Taiwan Semiconductor Manufacturing Co. Ltd.9.8
%
Samsung Electronics Co. Ltd.8.7
%
SK hynix, Inc.6.7
%
Northern Institutional U.S. Government Select Portfolio (Shares Class), 3.53%5.4
%
Taiwan Semiconductor Manufacturing Co. Ltd. - SP ADR3.7
%
Tencent Holdings Ltd.2.8
%
ASE Technology Holding Co. Ltd.2.7
%
OTP Bank Nyrt.1.7
%
CTBC Financial Holding Co. Ltd.1.7
%
Credicorp Ltd.1.7
%
INDUSTRY SECTOR ALLOCATION
Graphical Representation - Allocation 1 Chart
GEOGRAPHIC ALLOCATION
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
TOP TEN HOLDINGS
Taiwan Semiconductor Manufacturing Co. Ltd.9.8
%
Samsung Electronics Co. Ltd.8.7
%
SK hynix, Inc.6.7
%
Northern Institutional U.S. Government Select Portfolio (Shares Class), 3.53%5.4
%
Taiwan Semiconductor Manufacturing Co. Ltd. - SP ADR3.7
%
Tencent Holdings Ltd.2.8
%
ASE Technology Holding Co. Ltd.2.7
%
OTP Bank Nyrt.1.7
%
CTBC Financial Holding Co. Ltd.1.7
%
Credicorp Ltd.1.7
%
Driehaus Emerging Markets Small Cap Growth Fund  
Shareholder Report [Line Items]  
Fund Name Driehaus Emerging Markets Small CapGrowth Fund
Class Name Driehaus Emerging Markets Small CapGrowth Fund
Trading Symbol DRESX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Driehaus Emerging Markets Small Cap Growth Fund (“Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund atwww.driehaus.com/fund-resources. You can also request this information by contacting us at 1-800-560-6111.
Additional Information Phone Number 1-800-560-6111
Additional Information Website www.driehaus.com/fund-resources
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund
Cost of a $10,000 Investment
Costs paid as a percentage of a $10,000 investment
Driehaus Emerging Markets Small Cap Growth Fund (DRESX)
$
66		1.24
%
*
*
Annualized.
Expenses Paid, Amount $ 66
Expense Ratio, Percent 1.24% [1]
Net Assets $ 161,645,665
Holdings Count | Holding 86
Investment Company, Portfolio Turnover 53.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
161,645,665
Total number of portfolio holdings
86
Portfolio turnover rate as of the end of the reporting period (not annualized)
53
%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of total
 
net a
ss
ets of the Fund.
TOP TEN HOLDINGS
Northern Institutional U.S. Government Select Portfolio (Shares Class), 3.53%6.7
%
Hyosung Heavy Industries Corp.2.9
%
Vista Energy SAB de CV - ADR2.3
%
HPSP Co. Ltd.2.3
%
Orizon Valorizacao de Residuos SA2.3
%
Hitachi Energy India Ltd.1.9
%
Kinik Co.1.9
%
GE Vernova T&D India Ltd.1.8
%
Mega Union Technology, Inc.1.7
%
Aditya Infotech Ltd.1.7
%
INDUSTRY SECTOR ALLOCATION
Graphical Representation - Allocation 1 Chart
GEOGRAPHIC ALLOCATION
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
TOP TEN HOLDINGS
Northern Institutional U.S. Government Select Portfolio (Shares Class), 3.53%6.7
%
Hyosung Heavy Industries Corp.2.9
%
Vista Energy SAB de CV - ADR2.3
%
HPSP Co. Ltd.2.3
%
Orizon Valorizacao de Residuos SA2.3
%
Hitachi Energy India Ltd.1.9
%
Kinik Co.1.9
%
GE Vernova T&D India Ltd.1.8
%
Mega Union Technology, Inc.1.7
%
Aditya Infotech Ltd.1.7
%
Driehaus Global Fund  
Shareholder Report [Line Items]  
Fund Name Driehaus Global Fund
Class Name Driehaus Global Fund
Trading Symbol DMAGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Driehaus Global Fund (“Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.driehaus.com/fund-resources. You can also request this information by contacting us at 1-800-560-6111.
Additional Information Phone Number 1-800-560-6111
Additional Information Website www.driehaus.com/fund-resources
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund
Cost of a $10,000 Investment
Costs paid as a percentage of a $10,000 investment
Driehaus Global Fund (DMAGX)
$
41		0.75
%
*
*
Annualized.
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.75% [1]
Net Assets $ 89,917,657
Holdings Count | Holding 102
Investment Company, Portfolio Turnover 56.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
89,917,657
Total number of portfolio holdings
102
Portfolio turnover rate as of the end of the reporting period (not annualized)
56
%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of total
 
net assets of the Fund.
TOP TEN HOLDINGS
Alphabet, Inc. - A4.1
%
NVIDIA Corp.3.5
%
Amazon.com, Inc.3.5
%
Northern Institutional U.S. Government Select Portfolio (Shares Class), 3.53%3.1
%
Ibiden Co. Ltd.2.8
%
Taiwan Semiconductor Manufacturing Co. Ltd.2.2
%
Eli Lilly & Co.2.1
%
Seagate Technology Holdings PLC1.7
%
Disco Corp.1.6
%
ASML Holding NV1.6
%
INDUSTRY SECTOR ALLOCATION
Graphical Representation - Allocation 1 Chart
GEOGRAPHIC ALLOCATION
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
TOP TEN HOLDINGS
Alphabet, Inc. - A4.1
%
NVIDIA Corp.3.5
%
Amazon.com, Inc.3.5
%
Northern Institutional U.S. Government Select Portfolio (Shares Class), 3.53%3.1
%
Ibiden Co. Ltd.2.8
%
Taiwan Semiconductor Manufacturing Co. Ltd.2.2
%
Eli Lilly & Co.2.1
%
Seagate Technology Holdings PLC1.7
%
Disco Corp.1.6
%
ASML Holding NV1.6
%
Driehaus International Small Cap Growth Fund  
Shareholder Report [Line Items]  
Fund Name Driehaus International Small Cap Growth Fund
Class Name Driehaus International Small Cap Growth Fund
Trading Symbol DRIOX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Driehaus International Small Cap Growth Fund (“Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.driehaus.com/fund-resources. You can also request this information by contacting us at 1-800-560-6111.
Additional Information Phone Number 1-800-560-6111
Additional Information Website www.driehaus.com/fund-resources
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund
Cost of a $10,000 Investment
Costs paid as a percentage of a $10,000 investment
Driehaus International Small Cap Growth Fund (DRIOX)
$
58		1.12
%
*
*
Annualized.
Expenses Paid, Amount $ 58
Expense Ratio, Percent 1.12% [1]
Net Assets $ 311,165,267
Holdings Count | Holding 114
Investment Company, Portfolio Turnover 46.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
311,165,267
Total number of portfolio holdings
114
Portfolio turnover rate as of the end of the reporting period (not annualized)
46
%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of total
 
net assets of the Fund.
TOP TEN HOLDINGS
AT&S Austria Technologie & Systemtechnik AG3.5
%
SigmaRoc PLC2.1
%
Smiths Group PLC2.0
%
Omron Corp.2.0
%
Resonac Holdings Corp.2.0
%
Azbil Corp.1.8
%
Seiko Group Corp.1.7
%
PVA TePla AG1.6
%
Senior PLC1.6
%
Asahi Intecc Co. Ltd.1.6
%
INDUSTRY SECTOR ALLOCATION
Graphical Representation - Allocation 1 Chart
GEOGRAPHIC ALLOCATION
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
TOP TEN HOLDINGS
AT&S Austria Technologie & Systemtechnik AG3.5
%
SigmaRoc PLC2.1
%
Smiths Group PLC2.0
%
Omron Corp.2.0
%
Resonac Holdings Corp.2.0
%
Azbil Corp.1.8
%
Seiko Group Corp.1.7
%
PVA TePla AG1.6
%
Senior PLC1.6
%
Asahi Intecc Co. Ltd.1.6
%
Driehaus International Developed Equity Fund  
Shareholder Report [Line Items]  
Fund Name Driehaus International Developed Equity Fund
Class Name Driehaus International Developed Equity Fund
Trading Symbol DIDEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Driehaus International Developed Equity Fund (“Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.driehaus.com/fund-resources. You can also request this information by contacting us at 1-800-560-6111.
Additional Information Phone Number 1-800-560-6111
Additional Information Website www.driehaus.com/fund-resources
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund
Cost of a $10,000 Investment
Costs paid as a percentage of a $10,000 investment
Driehaus International Developed Equity Fund (DIDEX)
$
42		0.80
%
*
*
Annualized.
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.80% [1]
Net Assets $ 3,759,264
Holdings Count | Holding 60
Investment Company, Portfolio Turnover 50.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
3,759,264
Total number of portfolio holdings
60
Portfolio turnover rate as of the end of the reporting period (not annualized)
50
%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of total
 
net assets of the Fund.
TOP TEN HOLDINGS
ASML Holding NV6.2
%
Infineon Technologies AG4.3
%
Northern Institutional Treasury Portfolio, 3.51%3.6
%
Tokyo Electron Ltd.3.1
%
Japan Tobacco, Inc.2.9
%
Ryohin Keikaku Co. Ltd.2.9
%
ICON PLC2.6
%
Cie Financiere Richemont SA - A2.4
%
Panasonic Holdings Corp.2.4
%
UBS Group AG2.4
%
INDUSTRY SECTOR ALLOCATION
Graphical Representation - Allocation 1 Chart
GEOGRAPHIC ALLOCATION
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
TOP TEN HOLDINGS
ASML Holding NV6.2
%
Infineon Technologies AG4.3
%
Northern Institutional Treasury Portfolio, 3.51%3.6
%
Tokyo Electron Ltd.3.1
%
Japan Tobacco, Inc.2.9
%
Ryohin Keikaku Co. Ltd.2.9
%
ICON PLC2.6
%
Cie Financiere Richemont SA - A2.4
%
Panasonic Holdings Corp.2.4
%
UBS Group AG2.4
%
Driehaus Micro Cap Growth Fund  
Shareholder Report [Line Items]  
Fund Name Driehaus Micro Cap Growth Fund
Class Name Driehaus Micro Cap Growth Fund
Trading Symbol DMCRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Driehaus Micro Cap Growth Fund (“Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.driehaus.com/fund-resources. You can also request this information by contacting us at 1-800-560-6111.
Additional Information Phone Number 1-800-560-6111
Additional Information Website www.driehaus.com/fund-resources
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund
Cost of a $10,000 Investment
Costs paid as a percentage of a $10,000 investment
Driehaus Micro Cap Growth Fund (DMCRX)
$
78		1.34
%
*
*
Annualized.
Expenses Paid, Amount $ 78
Expense Ratio, Percent 1.34% [1]
Net Assets $ 596,755,835
Holdings Count | Holding 132
Investment Company, Portfolio Turnover 59.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
596,755,835
Total number of portfolio holdings
132
Portfolio turnover rate as of the end of the reporting period (not annualized)
59
%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of total
 
net assets of the Fund.
TOP TEN HOLDINGS
Definium Therapeutics, Inc.2.4
%
Praxis Precision Medicines, Inc.2.1
%
Spyre Therapeutics, Inc.2.0
%
Ultra Clean Holdings, Inc.1.9
%
Cardinal Infrastructure Group, Inc. - A1.9
%
CECO Environmental Corp.1.7
%
nLight, Inc.1.6
%
Xometry, Inc. - A1.5
%
Silicon Motion Technology Corp. - ADR1.4
%
Edgewise Therapeutics, Inc.1.4
%
INDUSTRY SECTOR ALLOCATION
Graphical Representation - Allocation 1 Chart
GEOGRAPHIC ALLOCATION
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
TOP TEN HOLDINGS
Definium Therapeutics, Inc.2.4
%
Praxis Precision Medicines, Inc.2.1
%
Spyre Therapeutics, Inc.2.0
%
Ultra Clean Holdings, Inc.1.9
%
Cardinal Infrastructure Group, Inc. - A1.9
%
CECO Environmental Corp.1.7
%
nLight, Inc.1.6
%
Xometry, Inc. - A1.5
%
Silicon Motion Technology Corp. - ADR1.4
%
Edgewise Therapeutics, Inc.1.4
%
Driehaus Small Cap Growth Fund - Institutional Class  
Shareholder Report [Line Items]  
Fund Name Driehaus Small Cap Growth Fund
Class Name Institutional Class
Trading Symbol DNSMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Driehaus Small Cap Growth Fund's Institutional Class (“Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund atwww.driehaus.com/fund-resources. You can also request this information by contacting us at 1-800-560-6111.
Additional Information Phone Number 1-800-560-6111
Additional Information Website www.driehaus.com/fund-resources
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class)
Cost of a $10,000 Investment
Costs paid as a percentage of a $10,000 investment
Driehaus Small Cap Growth Fund (Institutional Class/DNSMX)
$
39		0.69
%
*
*
Annualized.
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.69% [1]
Net Assets $ 1,627,010,538
Holdings Count | Holding 123
Investment Company, Portfolio Turnover 73.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,627,010,538
Total number of portfolio holdings
123
Portfolio turnover rate as of the end of the reporting period (not annualized)
73
%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of total
 
net assets of the Fund.
TOP TEN HOLDINGS
Northern Institutional U.S. Government Select Portfolio (Shares Class), 3.53%2.7
%
Vicor Corp.2.0
%
Guardant Health, Inc.2.0
%
Silicon Motion Technology Corp. - ADR1.9
%
Apogee Therapeutics, Inc.1.8
%
Praxis Precision Medicines, Inc.1.7
%
Definium Therapeutics, Inc.1.7
%
Planet Labs PBC1.7
%
Spyre Therapeutics, Inc.1.7
%
Curtiss-Wright Corp.1.5
%
INDUSTRY SECTOR ALLOCATION
Graphical Representation - Allocation 1 Chart
GEOGRAPHIC ALLOCATION
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
TOP TEN HOLDINGS
Northern Institutional U.S. Government Select Portfolio (Shares Class), 3.53%2.7
%
Vicor Corp.2.0
%
Guardant Health, Inc.2.0
%
Silicon Motion Technology Corp. - ADR1.9
%
Apogee Therapeutics, Inc.1.8
%
Praxis Precision Medicines, Inc.1.7
%
Definium Therapeutics, Inc.1.7
%
Planet Labs PBC1.7
%
Spyre Therapeutics, Inc.1.7
%
Curtiss-Wright Corp.1.5
%
Driehaus Small Cap Growth Fund - Investor Class  
Shareholder Report [Line Items]  
Fund Name Driehaus Small Cap Growth Fund
Class Name Investor Class
Trading Symbol DVSMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Driehaus Small Cap Growth Fund's Investor Class (“Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.driehaus.com/fund-resources. You can also request this information by contacting us at 1-800-560-6111.
Additional Information Phone Number 1-800-560-6111
Additional Information Website www.driehaus.com/fund-resources
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class)
Cost of a $10,000 Investment
Costs paid as a percentage of a $10,000 investment
Driehaus Small Cap Growth Fund (Investor Class/DVSMX)
$
50		0.90
%
*
*
Annualized.
Expenses Paid, Amount $ 50
Expense Ratio, Percent 0.90% [1]
Net Assets $ 1,627,010,538
Holdings Count | Holding 123
Investment Company, Portfolio Turnover 73.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
1,627,010,538
Total number of portfolio holdings
123
Portfolio turnover rate as of the end of the reporting period (not annualized)
73
%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of total
 
net assets of the Fund.
TOP TEN HOLDINGS
Northern Institutional U.S. Government Select Portfolio (Shares Class), 3.53%2.7
%
Vicor Corp.2.0
%
Guardant Health, Inc.2.0
%
Silicon Motion Technology Corp. - ADR1.9
%
Apogee Therapeutics, Inc.1.8
%
Praxis Precision Medicines, Inc.1.7
%
Definium Therapeutics, Inc.1.7
%
Planet Labs PBC1.7
%
Spyre Therapeutics, Inc.1.7
%
Curtiss-Wright Corp.1.5
%
INDUSTRY SECTOR ALLOCATION
Graphical Representation - Allocation 1 Chart
GEOGRAPHIC ALLOCATION
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
TOP TEN HOLDINGS
Northern Institutional U.S. Government Select Portfolio (Shares Class), 3.53%2.7
%
Vicor Corp.2.0
%
Guardant Health, Inc.2.0
%
Silicon Motion Technology Corp. - ADR1.9
%
Apogee Therapeutics, Inc.1.8
%
Praxis Precision Medicines, Inc.1.7
%
Definium Therapeutics, Inc.1.7
%
Planet Labs PBC1.7
%
Spyre Therapeutics, Inc.1.7
%
Curtiss-Wright Corp.1.5
%
Driehaus Small/Mid Cap Growth Fund  
Shareholder Report [Line Items]  
Fund Name Driehaus Small/Mid Cap Growth Fund
Class Name Driehaus Small/Mid Cap Growth Fund
Trading Symbol DSMDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Driehaus Small/Mid Cap Growth Fund (“Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.driehaus.com/fund-resources. You can also request this information by contacting us at 1-800-560-6111.
Additional Information Phone Number 1-800-560-6111
Additional Information Website www.driehaus.com/fund-resources
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund
Cost of a $10,000 Investment
Costs paid as a percentage of a $10,000 investment
Driehaus Small/Mid Cap Growth Fund (DSMDX)
$
44		0.80
%
*
*
Annualized.
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.80% [1]
Net Assets $ 115,852,810
Holdings Count | Holding 115
Investment Company, Portfolio Turnover 74.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
115,852,810
Total number of portfolio holdings
115
Portfolio turnover rate as of the end of the reporting period (not annualized)
74
%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the Fund, representing percentage of total
 
net assets of the Fund.
TOP TEN HOLDINGS
Northern Institutional U.S. Government Portfolio, 3.46%4.2
%
Astera Labs, Inc.2.7
%
Guardant Health, Inc.2.1
%
Praxis Precision Medicines, Inc.1.8
%
Comfort Systems USA, Inc.1.8
%
Carpenter Technology Corp.1.8
%
Curtiss-Wright Corp.1.7
%
Natera, Inc.1.7
%
Silicon Motion Technology Corp. - ADR1.7
%
Credo Technology Group Holding Ltd.1.6
%
INDUSTRY SECTOR ALLOCATION
Graphical Representation - Allocation 1 Chart
GEOGRAPHIC ALLOCATION
Graphical Representation - Allocation 2 Chart
Largest Holdings [Text Block]
TOP TEN HOLDINGS
Northern Institutional U.S. Government Portfolio, 3.46%4.2
%
Astera Labs, Inc.2.7
%
Guardant Health, Inc.2.1
%
Praxis Precision Medicines, Inc.1.8
%
Comfort Systems USA, Inc.1.8
%
Carpenter Technology Corp.1.8
%
Curtiss-Wright Corp.1.7
%
Natera, Inc.1.7
%
Silicon Motion Technology Corp. - ADR1.7
%
Credo Technology Group Holding Ltd.1.6
%
[1] Annualized.