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Shareholder Report
 12 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name FMI Funds, Inc.
Entity Central Index Key 0001023391
Entity Investment Company Type N-1A
Document Period End Date Sep. 30, 2025
Shareholder Report Annual or Semi-Annual annual shareholder report
Investor Class  
Shareholder Report [Line Items]  
Fund Name FMI Common Stock Fund
Class Name Investor Class
Trading Symbol FMIMX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FMI Common Stock Fund for the period of October 1, 2024, to September 30, 2025.
Additional Information [Text Block] You can find additional information about the Fund at https://www.fmimgt.com/common-stock-fund/. You can also request this information by contacting us at 1-800-811-5311.
Additional Information Phone Number 1-800-811-5311
Additional Information Website https://www.fmimgt.com/common-stock-fund/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE PAST YEAR? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$97
0.95%
Expenses Paid, Amount $ 97
Expense Ratio, Percent 0.95%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM AND WHAT AFFECTED ITS PERFORMANCE?
Over the past 12 months ending September 30, 2025, the FMI Common Stock Fund Investor Class gained 3.26%, compared with 10.76% for the Russell 2000 Index and 7.88% for the Russell 2000 Value Index.
Growth stocks have led the market with the Russell 2000 Growth Index outperforming the Russell 2000 Value Index by nearly 6% during the period. Relative to history, U.S. valuations are at or near all-time highs, there is unwavering exuberance around artificial intelligence (AI) and technology, and investors continue to pile into equities at a record pace, despite economic growth showing cracks beneath the surface. U.S. employment has slumped, the housing market has softened, construction spending is declining, ISM manufacturing has generally been in contraction, and transportation faces a “freight recession”. In the past, consumer confidence and stock market confidence have generally moved in harmony. Today, consumer confidence is low (and falling) at a time when stock market confidence is soaring. This dichotomy between Wall Street and Main Street has precedent, though it has rarely persisted over extended periods.
The Fund strives to generate strong absolute returns through a full cycle while having less volatility, with a focus on downside protection. In environments characterized by speculative excess, as the one observed over the past year, the Fund’s positioning has tended to lag broader benchmarks. Looking different than the market has been a disadvantage over this period. Regardless, FMI remains disciplined on business quality, balance sheet strength and valuation.
Broadly speaking, the recent rally in the Russell 2000 to end the fiscal year was driven by lower quality businesses. The FMI Common Stock Fund was underweight Technology (Electronic and Services) due to valuation. The Fund also faced a headwind from its outsized positioning in the Building Products industry as residential construction was under pressure. The Fund benefited from stock selection in Finance and Specialty Retail, as well as not having direct exposure to Health Technology during the period.
Top Contributors
↑
Sectors: Finance, Electronic Technology, Distribution Services
↑
Positions: nVent Electric PLC, FirstCash Holdings Inc., Gates Industrial Corp. PLC
Top Detractors
↓
Sectors: Technology Services, Commercial Services, Producer Manufacturing
↓
Positions: Insight Enterprises Inc., Fortune Brands Innovations Inc., Robert Half Inc.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN (%)
 
1 Year
5 Year
10 Year
Investor Class
3.26
17.12
11.39
Russell 2000® Index
10.76
11.56
9.77
Russell 2000® Value Index
7.88
14.59
9.23
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
Visit https://www.fmimgt.com/common-stock-fund/ for more recent performance information.
Net Assets $ 2,233,985,831
Holdings Count | $ / shares 30
Advisory Fees Paid, Amount $ 17,427,725
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (presented for the Fund as a whole as of September 30, 2025)
Net Assets
$2,233,985,831
Net Advisory Fee
$17,427,725
Number of Holdings
30
Portfolio Turnover
35%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (% of total investments as of  September 30, 2025)
Top 10 Issuers
Aramark
5.3%
FirstCash Holdings, Inc.
4.9%
Arrow Electronics, Inc.
4.9%
Donaldson Co., Inc.
4.8%
Plexus Corp.
4.7%
Gates Industrial Corp. PLC
4.5%
Primerica, Inc.
4.4%
Zions Bancorp NA
4.2%
Simpson Manufacturing Co., Inc.
4.2%
Valvoline, Inc.
4.1%
Sector Breakdown
Finance
24.8%
Producer Manufacturing
19.0%
Distribution Services
13.9%
Consumer Services
9.4%
Consumer Durables
8.2%
Electronic Technology
7.0%
Commercial Services
3.8%
Process Industries
3.8%
Technology Services
3.8%
Cash & Other
6.3%
Updated Prospectus Web Address https://www.fmimgt.com/common-stock-fund/
Institutional Class  
Shareholder Report [Line Items]  
Fund Name FMI Common Stock Fund
Class Name Institutional Class
Trading Symbol FMIUX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FMI Common Stock Fund for the period of October 1, 2024, to September 30, 2025.
Additional Information [Text Block] You can find additional information about the Fund at https://www.fmimgt.com/common-stock-fund/. You can also request this information by contacting us at 1-800-811-5311.
Additional Information Phone Number 1-800-811-5311
Additional Information Website https://www.fmimgt.com/common-stock-fund/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE PAST YEAR? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$84
0.83%
Expenses Paid, Amount $ 84
Expense Ratio, Percent 0.83%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM AND WHAT AFFECTED ITS PERFORMANCE?
Over the past 12 months ending September 30, 2025, the FMI Common Stock Fund Institutional Class gained 3.39%, compared with 10.76% for the Russell 2000 Index and 7.88% for the Russell 2000 Value Index.
Growth stocks have led the market with the Russell 2000 Growth Index outperforming the Russell 2000 Value Index by nearly 6% during the period. Relative to history, U.S. valuations are at or near all-time highs, there is unwavering exuberance around artificial intelligence (AI) and technology, and investors continue to pile into equities at a record pace, despite economic growth showing cracks beneath the surface. U.S. employment has slumped, the housing market has softened, construction spending is declining, ISM manufacturing has generally been in contraction, and transportation faces a “freight recession”. In the past, consumer confidence and stock market confidence have generally moved in harmony. Today, consumer confidence is low (and falling) at a time when stock market confidence is soaring. This dichotomy between Wall Street and Main Street has precedent, though it has rarely persisted over extended periods.
The Fund strives to generate strong absolute returns through a full cycle while having less volatility, with a focus on downside protection. In environments characterized by speculative excess, as the one observed over the past year, the Fund’s positioning has tended to lag broader benchmarks. Looking different than the market has been a disadvantage over this period. Regardless, FMI remains disciplined on business quality, balance sheet strength and valuation.
Broadly speaking, the recent rally in the Russell 2000 to end the fiscal year was driven by lower quality businesses. The FMI Common Stock Fund was underweight Technology (Electronic and Services) due to valuation. The Fund also faced a headwind from its outsized positioning in the Building Products industry as residential construction was under pressure. The Fund benefited from stock selection in Finance and Specialty Retail, as well as not having direct exposure to Health Technology during the period.
Top Contributors
↑
Sectors: Finance, Electronic Technology, Distribution Services
↑
Positions: nVent Electric PLC, FirstCash Holdings Inc., Gates Industrial Corp. PLC
Top Detractors
↓
Sectors: Technology Services, Commerical Services, Producer Manufacturing
↓
Positions: Insight Enterprises Inc., Fortune Brands Innovations Inc., Robert Half Inc.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN (%)
 
1 Year
5 Year
Since Inception
(10/31/2016)
Institutional Class
3.39
17.26
11.84
Russell 2000® Index
10.76
11.56
9.84
Russell 2000® Value Index
7.88
14.59
8.70
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
Visit https://www.fmimgt.com/common-stock-fund/ for more recent performance information.
Net Assets $ 2,233,985,831
Holdings Count | $ / shares 30
Advisory Fees Paid, Amount $ 17,427,725
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (presented for the Fund as a whole as of September 30, 2025)
Net Assets
$2,233,985,831
Net Advisory Fee
$17,427,725
Number of Holdings
30
Portfolio Turnover
35%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (% of total investments as of  September 30, 2025)
Top 10 Issuers
Aramark
5.3%
FirstCash Holdings, Inc.
4.9%
Arrow Electronics, Inc.
4.9%
Donaldson Co., Inc.
4.8%
Plexus Corp.
4.7%
Gates Industrial Corp. PLC
4.5%
Primerica, Inc.
4.4%
Zions Bancorp NA
4.2%
Simpson Manufacturing Co., Inc.
4.2%
Valvoline, Inc.
4.1%
Sector Breakdown
Finance
24.8%
Producer Manufacturing
19.0%
Distribution Services
13.9%
Consumer Services
9.4%
Consumer Durables
8.2%
Electronic Technology
7.0%
Commercial Services
3.8%
Process Industries
3.8%
Technology Services
3.8%
Cash & Other
6.3%
Updated Prospectus Web Address https://www.fmimgt.com/common-stock-fund/
Investor Class  
Shareholder Report [Line Items]  
Fund Name FMI Large Cap Fund
Class Name Investor Class
Trading Symbol FMIHX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FMI Large Cap Fund for the period of October 1, 2024, to September 30, 2025.
Additional Information [Text Block] You can find additional information about the Fund at https://www.fmimgt.com/large-cap-fund/. You can also request this information by contacting us at 1-800-811-5311.
Additional Information Phone Number 1-800-811-5311
Additional Information Website https://www.fmimgt.com/large-cap-fund/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE PAST YEAR? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$85
0.84%
Expenses Paid, Amount $ 85
Expense Ratio, Percent 0.84%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM AND WHAT AFFECTED ITS PERFORMANCE?
Over the past 12 months ending September 30, 2025, the FMI Large Cap Fund Investor Class gained 1.98%, compared with 17.60% for the S&P 500 Index and 9.25% for the iShares Russell 1000 Value ETF.
Growth stocks have led the market with the Russell 1000 Growth ETF outperforming the Russell 1000 Value ETF by over 16% during the period. Relative to history, U.S. valuations are at or near all-time highs, market concentration continues to increase, there is unwavering exuberance around artificial intelligence (AI) and mega cap technology, and investors continue to pile into equities at a record pace, despite economic growth showing cracks beneath the surface. U.S. employment has slumped, the housing market has softened, construction spending is declining, ISM manufacturing has generally been in contraction, and transportation faces a “freight recession”. In the past, consumer confidence and stock market confidence have generally moved in harmony. Today, consumer confidence is low (and falling) at a time when stock market confidence is soaring. This dichotomy between Wall Street and Main Street has precedent, though it has rarely persisted over extended periods.
The Fund strives to generate strong absolute returns through a full cycle while having less volatility, with a focus on downside protection. In environments characterized by speculative excess, as the one observed over the past year, the Fund’s positioning has tended to lag broader benchmarks. Looking different than the market has been a disadvantage over this period. Regardless, FMI remains disciplined on business quality, balance sheet strength and valuation.
Technology (Electronic and Services) accounted for 73% of the S&P 500 return over the trailing year. An underweight and relative stock selection in these sectors (due to valuation) was the largest driver of underperformance during the period. Additionally, some stock specific detractors in Producer Manufacturing and an overweight in Process Industries negatively impacted performance. Conversely, the Fund’s overweight and positive stock selection in Finance was additive, as was the lack of direct exposure to Energy Minerals and Utilities.
Top Contributors
↑
Sectors: Finance, Consumer Services, Distribution Services
↑
Positions: Charles Schwab Corp., Sony Group Corp.-SP-ADR, Booking Holdings Inc.
Top Detractors
↓
Sectors: Producer Manufacturing, Process Industries, Health Technology
↓
Positions: UnitedHealth Group Inc., CarMax Inc., Avery Dennison Corp.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN (%)
 
1 Year
5 Year
10 Year
Investor Class
1.98
10.75
10.22
S&P 500® Index
17.60
16.47
15.30
iShares® Russell 1000 Value ETF
9.25
13.68
10.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
Visit https://www.fmimgt.com/large-cap-fund/ for more recent performance information.
Net Assets $ 1,388,834,730
Holdings Count | $ / shares 29
Advisory Fees Paid, Amount $ 9,659,529
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (presented for the Fund as a whole as of September 30, 2025)
Net Assets
$1,388,834,730
Net Advisory Fee
$9,659,529
Number of Holdings
29
Portfolio Turnover
23%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (% of total investments as of  September 30, 2025)
Top 10 Issuers
Charles Schwab Corp.
7.5%
Ferguson Enterprises, Inc.
6.7%
Booking Holdings, Inc.
5.8%
Aramark
5.0%
Avery Dennison Corp.
4.5%
Quest Diagnostics, Inc.
4.2%
Carrier Global Corp.
4.1%
Becton Dickinson & Co.
4.1%
CSX Corp.
4.0%
Alphabet, Inc.
3.9%
Sector Breakdown
Finance
17.8%
Consumer Services
10.9%
Distribution Services
10.4%
Health Services
9.8%
Producer Manufacturing
9.7%
Health Technology
7.8%
Technology Services
7.2%
Retail Trade
5.0%
Process Industries
4.5%
Cash & Other
16.9%
Updated Prospectus Web Address https://www.fmimgt.com/large-cap-fund/
Institutional Class  
Shareholder Report [Line Items]  
Fund Name FMI Large Cap Fund
Class Name Institutional Class
Trading Symbol FMIQX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FMI Large Cap Fund for the period of October 1, 2024, to September 30, 2025.
Additional Information [Text Block] You can find additional information about the Fund at https://www.fmimgt.com/large-cap-fund/. You can also request this information by contacting us at 1-800-811-5311.
Additional Information Phone Number 1-800-811-5311
Additional Information Website https://www.fmimgt.com/large-cap-fund/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE PAST YEAR? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$72
0.71%
Expenses Paid, Amount $ 72
Expense Ratio, Percent 0.71%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM AND WHAT AFFECTED ITS PERFORMANCE?
Over the past 12 months ending September 30, 2025, the FMI Large Cap Fund Institutional Class gained 2.10%, compared with 17.60% for the S&P 500 Index and 9.25% for the iShares Russell 1000 Value ETF.
Growth stocks have led the market with the Russell 1000 Growth ETF outperforming the Russell 1000 Value ETF by over 16% during the period. Relative to history, U.S. valuations are at or near all-time highs, market concentration continues to increase, there is unwavering exuberance around artificial intelligence (AI) and mega cap technology, and investors continue to pile into equities at a record pace, despite economic growth showing cracks beneath the surface. U.S. employment has slumped, the housing market has softened, construction spending is declining, ISM manufacturing has generally been in contraction, and transportation faces a “freight recession”. In the past, consumer confidence and stock market confidence have generally moved in harmony. Today, consumer confidence is low (and falling) at a time when stock market confidence is soaring. This dichotomy between Wall Street and Main Street has precedent, though it has rarely persisted over extended periods.
The Fund strives to generate strong absolute returns through a full cycle while having less volatility, with a focus on downside protection. In environments characterized by speculative excess, as the one observed over the past year, the Fund’s positioning has tended to lag broader benchmarks. Looking different than the market has been a disadvantage over this period. Regardless, FMI remains disciplined on business quality, balance sheet strength and valuation.
Technology (Electronic and Services) accounted for 73% of the S&P 500 return over the trailing year. An underweight and relative stock selection in these sectors (due to valuation) was the largest driver of underperformance during the period. Additionally, some stock specific detractors in Producer Manufacturing and an overweight in Process Industries negatively impacted performance. Conversely, the Fund’s overweight and positive stock selection in Finance was additive, as was the lack of direct exposure to Energy Minerals and Utilities.
Top Contributors
↑
Sectors: Finance, Consumer Services, Distribution Services
↑
Positions: Charles Schwab Corp., Sony Group Corp.-SP-ADR, Booking Holdings Inc.
Top Detractors
↓
Sectors: Producer Manufacturing, Process Industries, Health Technology
↓
Positions: UnitedHealth Group Inc., CarMax Inc., Avery Dennison Corp.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN (%)
 
1 Year
5 Year
Since Inception
(10/31/2016)
Institutional Class
2.10
10.88
10.51
S&P 500® Index
17.60
16.47
15.68
iShares® Russell 1000 Value ETF
9.25
13.68
10.23
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
Visit https://www.fmimgt.com/large-cap-fund/ for more recent performance information.
Net Assets $ 1,388,834,730
Holdings Count | $ / shares 29
Advisory Fees Paid, Amount $ 9,659,529
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (presented for the Fund as a whole as of September 30, 2025)
Net Assets
$1,388,834,730
Net Advisory Fee
$9,659,529
Number of Holdings
29
Portfolio Turnover
23%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (% of total investments as of  September 30, 2025)
Top 10 Issuers
Charles Schwab Corp.
7.5%
Ferguson Enterprises, Inc.
6.7%
Booking Holdings, Inc.
5.8%
Aramark
5.0%
Avery Dennison Corp.
4.5%
Quest Diagnostics, Inc.
4.2%
Carrier Global Corp.
4.1%
Becton Dickinson & Co.
4.1%
CSX Corp.
4.0%
Alphabet, Inc.
3.9%
Sector Breakdown
Finance
17.8%
Consumer Services
10.9%
Distribution Services
10.4%
Health Services
9.8%
Producer Manufacturing
9.7%
Health Technology
7.8%
Technology Services
7.2%
Retail Trade
5.0%
Process Industries
4.5%
Cash & Other
16.9%
Updated Prospectus Web Address https://www.fmimgt.com/large-cap-fund/
Investor Class  
Shareholder Report [Line Items]  
Fund Name FMI International Fund
Class Name Investor Class
Trading Symbol FMIJX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FMI International Fund for the period of October 1, 2024, to September 30, 2025.
Additional Information [Text Block] You can find additional information about the Fund at https://www.fmimgt.com/international-fund/. You can also request this information by contacting us at 1-800-811-5311.
Additional Information Phone Number 1-800-811-5311
Additional Information Website https://www.fmimgt.com/international-fund/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE PAST YEAR? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class
$97
0.95%
Expenses Paid, Amount $ 97
Expense Ratio, Percent 0.95%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM AND WHAT AFFECTED ITS PERFORMANCE?
Over the past 12 months ending September 30, 2025, the FMI International Fund Investor Class gained 4.11%, compared with the MSCI EAFE Index’s return of 12.92% in local currency and 14.99% in U.S. Dollars. The passive currency hedge was a negligible headwind during the period.
The EAFE was driven by financials, defense companies, and unwavering enthusiasm around AI and technology. FMI has historically been underweight financials, and banks in particular, given their high leverage, opaque balance sheets, and low margins. We pick our spots, preferring financials with more competitively advantaged business models, such as insurance, money managers, rental companies, payment networks, and financial processors, which often have better return profiles and lower leverage. When rate-sensitive banks rally, the Fund typically gives up some relative ground. FMI’s exposure to defense has also historically been limited, with concerns around business quality (reliance on government spending), growth prospects, and valuation. After the recent stock moves and blanket basket buying, current valuations are elevated.
The Fund strives to generate strong absolute returns through a full cycle while having less volatility, with a focus on downside protection. In environments characterized by speculative excess, as the one observed over the past year, the Fund’s positioning has tended to lag broader benchmarks. Looking different than the market has been a disadvantage over this period. Regardless, FMI remains disciplined on business quality, balance sheet strength and valuation.
Finance accounted for 56% of the MSCI EAFE return over the trailing year. An underweight and relative stock selection in this sector was the largest driver of underperformance during the period. Conversely, the Fund’s exposure in Pharmaceutical, Electrical Products, and Industrial Machinery Industries were additive to returns.
Top Contributors
↑
Sectors: Electronic Technology, Producer Manufacturing, Finance
↑
Positions: Sony Group Corp., Booking Holdings Inc., Ryanair Holdings PLC-SP-ADR
Top Detractors
↓
Sectors: Consumer Non-Durables, Retail Trade, Health Technology
↓
Positions: Greggs PLC, B&M European Value Retail SA, Sodexo SA
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN (%)
1 Year
5 Year
10 Year
Investor Class
4.11
10.83
7.19
MSCI EAFE® (LOC) Index
12.92
12.54
8.62
MSCI EAFE® (LOC) Value Index
20.28
17.11
8.68
MSCI EAFE® (USD) Index
14.99
11.15
8.17
MSCI EAFE® (USD) Value Index
22.53
15.66
8.16
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
Visit https://www.fmimgt.com/international-fund/ for more recent performance information.
Net Assets $ 2,733,531,920
Holdings Count | $ / shares 44
Advisory Fees Paid, Amount $ 30,436,596
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (presented for the Fund as a whole as of September 30, 2025)
Net Assets
$2,733,531,920
Net Advisory Fee
$30,436,596
Number of Holdings
44
Portfolio Turnover
16%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (% of total investments as of  September 30, 2025)
Top 10 Issuers
Sodexo SA
4.6%
Weir Group PLC
4.3%
Rexel SA
4.2%
Ashtead Group PLC
4.2%
Informa PLC
4.1%
Booking Holdings, Inc.
4.1%
Unilever PLC
4.1%
Koninklijke Philips NV
3.8%
Ryanair Holdings PLC
3.7%
Coca-Cola Europacific Partners PLC
3.7%
Geographic Breakdown
Britain
32.9%
France
10.8%
Japan
9.1%
United States
7.6%
Ireland
7.2%
Netherlands
5.7%
Germany
5.5%
Switzerland
4.6%
Hong Kong
3.4%
Other Countries
13.2%
Sector Breakdown
Consumer Non-Durables
12.6%
Producer Manufacturing
12.2%
Distribution Services
9.6%
Finance
9.0%
Consumer Services
8.7%
Consumer Durables
7.5%
Commercial Services
7.3%
Health Technology
6.0%
Electronic Technology
5.8%
Cash & Other
21.3%
Updated Prospectus Web Address https://www.fmimgt.com/international-fund/
Institutional Class  
Shareholder Report [Line Items]  
Fund Name FMI International Fund
Class Name Institutional Class
Trading Symbol FMIYX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FMI International Fund for the period of October 1, 2024, to September 30, 2025.
Additional Information [Text Block] You can find additional information about the Fund at https://www.fmimgt.com/international-fund/. You can also request this information by contacting us at 1-800-811-5311.
Additional Information Phone Number 1-800-811-5311
Additional Information Website https://www.fmimgt.com/international-fund/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE PAST YEAR? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$82
0.80%
Expenses Paid, Amount $ 82
Expense Ratio, Percent 0.80%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM AND WHAT AFFECTED ITS PERFORMANCE?
Over the past 12 months ending September 30, 2025, the FMI International Fund Institutional Class gained 4.25%, compared with the MSCI EAFE Index’s return of 12.92% in local currency and 14.99% in U.S. Dollars. The passive currency hedge was a negligible headwind during the period.
The EAFE was driven by financials, defense companies, and unwavering enthusiasm around AI and technology. FMI has historically been underweight financials, and banks in particular, given their high leverage, opaque balance sheets, and low margins. We pick our spots, preferring financials with more competitively advantaged business models, such as insurance, money managers, rental companies, payment networks, and financial processors, which often have better return profiles and lower leverage. When rate-sensitive banks rally, the Fund typically gives up some relative ground. FMI’s exposure to defense has also historically been limited, with concerns around business quality (reliance on government spending), growth prospects, and valuation. After the recent stock moves and blanket basket buying, current valuations are elevated.
The Fund strives to generate strong absolute returns through a full cycle while having less volatility, with a focus on downside protection. In environments characterized by speculative excess, as the one observed over the past year, the Fund’s positioning has tended to lag broader benchmarks. Looking different than the market has been a disadvantage over this period. Regardless, FMI remains disciplined on business quality, balance sheet strength and valuation.
Finance accounted for 56% of the MSCI EAFE return over the trailing year. An underweight and relative stock selection in this sector was the largest driver of underperformance during the period. Conversely, the Fund’s exposure in Pharmaceutical, Electrical Products, and Industrial Machinery Industries were additive to returns.
Top Contributors
↑
Sectors: Electronic Technology, Producer Manufacturing, Finance
↑
Positions: Sony Group Corp., Booking Holdings Inc., Ryanair Holdings PLC-SP-ADR
Top Detractors
↓
Sectors: Consumer Non-Durables, Retail Trade, Health Technology
↓
Positions: Greggs PLC, B&M European Value Retail SA, Sodexo SA
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN (%)
1 Year
5 Year
Since Inception
(10/31/2016)
Institutional Class
4.25
10.98
6.88
MSCI EAFE® (LOC) Index
12.92
12.54
9.02
MSCI EAFE® (LOC) Value Index
20.28
17.11
9.08
MSCI EAFE® (USD) Index
14.99
11.15
8.69
MSCI EAFE® (USD) Value Index
22.53
15.66
8.74
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
Visit https://www.fmimgt.com/international-fund/ for more recent performance information.
Net Assets $ 2,733,531,920
Holdings Count | $ / shares 44
Advisory Fees Paid, Amount $ 30,436,596
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (presented for the Fund as a whole as of September 30, 2025)
Net Assets
$2,733,531,920
Net Advisory Fee
$30,436,596
Number of Holdings
44
Portfolio Turnover
16%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (% of total investments as of  September 30, 2025)
Top 10 Issuers
Sodexo SA
4.6%
Weir Group PLC
4.3%
Rexel SA
4.2%
Ashtead Group PLC
4.2%
Informa PLC
4.1%
Booking Holdings, Inc.
4.1%
Unilever PLC
4.1%
Koninklijke Philips NV
3.8%
Ryanair Holdings PLC
3.7%
Coca-Cola Europacific Partners PLC
3.7%
Geographic Breakdown
Britain
32.9%
France
10.8%
Japan
9.1%
United States
7.6%
Ireland
7.2%
Netherlands
5.7%
Germany
5.5%
Switzerland
4.6%
Hong Kong
3.4%
Other Countries
13.2%
Sector Breakdown
Consumer Non-Durables
12.6%
Producer Manufacturing
12.2%
Distribution Services
9.6%
Finance
9.0%
Consumer Services
8.7%
Consumer Durables
7.5%
Commercial Services
7.3%
Health Technology
6.0%
Electronic Technology
5.8%
Cash & Other
21.3%
Updated Prospectus Web Address https://www.fmimgt.com/international-fund/
Institutional Class  
Shareholder Report [Line Items]  
Fund Name FMI International Fund II - Currency Unhedged
Class Name Institutional Class
Trading Symbol FMIFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FMI International Fund II - Currency Unhedged for the period of October 1, 2024, to September 30, 2025.
Additional Information [Text Block] You can find additional information about the Fund at https://www.fmimgt.com/international-fund-2/. You can also request this information by contacting us at 1-800-811-5311.
Additional Information Phone Number 1-800-811-5311
Additional Information Website https://www.fmimgt.com/international-fund-2/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE PAST YEAR? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional Class
$92
0.90%
Expenses Paid, Amount $ 92
Expense Ratio, Percent 0.90%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM AND WHAT AFFECTED ITS PERFORMANCE?
Over the past 12 months ending September 30, 2025, the FMI International Fund II – Currency Unhedged Institutional Class gained 4.33%, compared with the MSCI EAFE Index’s return of 14.99% in U.S. Dollars.
The EAFE was driven by financials, defense companies, and unwavering enthusiasm around AI and technology. FMI has historically been underweight financials, and banks in particular, given their high leverage, opaque balance sheets, and low margins. We pick our spots, preferring financials with more competitively advantaged business models, such as insurance, money managers, rental companies, payment networks, and financial processors, which often have better return profiles and lower leverage. When rate-sensitive banks rally, the Fund typically gives up some relative ground. FMI’s exposure to defense has also historically been limited, with concerns around business quality (reliance on government spending), growth prospects, and valuation. After the recent stock moves and blanket basket buying, current valuations are elevated.
The Fund strives to generate strong absolute returns through a full cycle while having less volatility, with a focus on downside protection. In environments characterized by speculative excess, as the one observed over the past year, the Fund’s positioning has tended to lag broader benchmarks. Looking different than the market has been a disadvantage over this period. Regardless, FMI remains disciplined on business quality, balance sheet strength and valuation.
Finance accounted for 56% of the MSCI EAFE return over the trailing year. An underweight and relative stock selection in this sector was the largest driver of underperformance during the period. Conversely, the Fund’s exposure in Pharmaceutical, Electrical Products, and Industrial Machinery Industries were additive to returns.
Top Contributors
↑
Sectors: Producer Manufacturing, Electronic Technology, Finance
↑
Positions: Sony Group Corp., Booking Holdings Inc., Lloyds Banking Group PLC
Top Detractors
↓
Sectors: Consumer Non-Durables, Retail Trade, Health Technology
↓
Positions: Greggs PLC, B&M European Value Retail SA, Sodexo SA
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN (%)
 
1 Year
5 Year
Since Inception
(12/31/2019)
Institutional Class
4.33
8.85
4.91
MSCI EAFE® (USD) Index
14.99
11.15
8.24
MSCI EAFE® (USD) Value Index
22.53
15.66
9.56
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
Visit https://www.fmimgt.com/international-fund-2/ for more recent performance information.
Net Assets $ 72,361,877
Holdings Count | $ / shares 35
Advisory Fees Paid, Amount $ 340,130
Investment Company Portfolio Turnover 22.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (presented for the Fund as a whole as of September 30, 2025)
Net Assets
$72,361,877
Net Advisory Fee
$340,130
Number of Holdings
35
Portfolio Turnover
22%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (% of total investments as of  September 30, 2025)
Top 10 Issuers
Sodexo SA
4.5%
Weir Group PLC
4.2%
Rexel SA
4.1%
Ashtead Group PLC
4.0%
Unilever PLC
4.0%
Informa PLC
4.0%
Booking Holdings, Inc.
4.0%
Koninklijke Philips NV
3.7%
Ryanair Holdings PLC
3.6%
Coca-Cola Europacific Partners PLC
3.6%
Geographic Breakdown
Britain
31.9%
France
10.6%
United States
10.2%
Japan
8.9%
Ireland
7.0%
Netherlands
5.6%
Germany
5.4%
Switzerland
4.4%
Hong Kong
3.3%
Other Countries
12.7%
Sector Breakdown
Consumer Non-Durables
12.2%
Producer Manufacturing
11.9%
Distribution Services
9.4%
Finance
8.7%
Consumer Services
8.4%
Consumer Durables
7.3%
Commercial Services
7.1%
Health Technology
5.8%
Electronic Technology
5.7%
Cash & Other
23.5%
Updated Prospectus Web Address https://www.fmimgt.com/international-fund-2/
Institutional Class  
Shareholder Report [Line Items]  
Fund Name FMI Global Fund
Class Name Institutional Class
Trading Symbol FMIGX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the FMI Global Fund for the period of December 31, 2024 (inception date), to September 30, 2025.
Additional Information [Text Block] You can find additional information about the Fund at https://www.fmimgt.com/global-fund/. You can also request this information by contacting us at 1-800-811-5311.
Additional Information Phone Number 1-800-811-5311
Additional Information Website https://www.fmimgt.com/global-fund/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE PAST YEAR? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment**
Costs paid as a percentage of a $10,000 investment*
Institutional Class
$69
0.90%
[1],[2]
Expenses Paid, Amount $ 69
Expense Ratio, Percent 0.90% [1]
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM AND WHAT AFFECTED ITS PERFORMANCE?
Over the past 9 months ending September 30, 2025, the FMI Global Fund Institutional Class gained 5.50%, compared with the MSCI World Index return of 17.43% in U.S. Dollars.
Growth stocks have led the market with the MSCI World Growth ETF outperforming the MSCI World Value ETF by over 10% during the period. Relative to history, in the U.S. (~70% of MSCI World Index) valuations are at or near all-time highs, market concentration continues to increase, there is unwavering exuberance around artificial intelligence (AI) and mega cap technology, and investors continue to pile into equities at a record pace, despite economic growth showing cracks beneath the surface. Employment has slumped, the housing market has softened, construction spending is declining, ISM manufacturing has generally been in contraction, and transportation faces a “freight recession”. In the past, consumer confidence and stock market confidence have generally moved in harmony. Today, consumer confidence is low (and falling) at a time when stock market confidence is soaring. This dichotomy between Wall Street and Main Street has precedent, though it has rarely persisted over extended periods.
Overseas markets were driven by financials, defense companies, and unwavering enthusiasm around AI and technology. FMI has historically been underweight financials, and banks in particular, given their high leverage, opaque balance sheets, and low margins. We pick our spots, preferring financials with more competitively advantaged business models, such as insurance, money managers, rental companies, payment networks, and financial processors, which often have better return profiles and lower leverage. When rate-sensitive banks rally, the Fund typically gives up some relative ground. FMI’s exposure to defense has also historically been limited, with concerns around business quality (reliance on government spending), growth prospects, and valuation. After the recent stock moves and blanket basket buying, current valuations are elevated.
The Fund strives to generate strong absolute returns through a full cycle while having less volatility, with a focus on downside protection. In environments characterized by speculative excess, as the one observed over the past year, the Fund’s positioning has tended to lag broader benchmarks. Looking different than the market has been a disadvantage over this period. Regardless, FMI remains disciplined on business quality, balance sheet strength and valuation.
Inception to date, The Fund’s consumer related names have struggled in the Specialty, Discount Retail, and Alcoholic Beverage industries, along with Industrial exposure that has been impacted by a challenging residential construction environment. Conversely, the Fund’s overweight and positive stock selection in Pharmaceutical and Medical Specialties Industries within the Health Technology Sector as well as Airlines within Transportation were additive.
Top Contributors
↑
Sectors: Distribution Services, Electronic Technology, Finance
↑
Positions: Sony Group Corp., Ryan Holdings PLC-SP-ADR, Ferguson Enterprises Inc.
Top Detractors
↓
Sectors: Retail Trade, Health Services, Consumer Non-Durables
↓
Positions: CarMax Inc., UnitedHealth Group Inc., Sodexo SA
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
image
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN (%)
Since Inception
(12/31/2024)
Institutional Class
5.50
MSCI World® (USD) Index
17.43
MSCI ACWI® (USD) Index
18.44
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares.
Updated Performance Information Location [Text Block]
Visit https://www.fmimgt.com/global-fund/ for more recent performance information.
Net Assets $ 10,441,585
Holdings Count | $ / shares 33
Advisory Fees Paid, Amount $ 0
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (presented for the Fund as a whole as of September 30, 2025)
Net Assets
$10,441,585
Net Advisory Fee
$0
Number of Holdings
33
Portfolio Turnover
18%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (% of total investments as of  September 30, 2025)
Top 10 Issuers
Ferguson Enterprises, Inc.
5.7%
Charles Schwab Corp.
5.4%
Weir Group PLC
4.6%
Booking Holdings, Inc.
4.1%
Informa PLC
4.1%
Ashtead Group PLC
4.0%
Ryanair Holdings PLC
3.7%
Sodexo SA
3.7%
First American Treasury Obligations Fund
3.5%
Sony Group Corp.
3.4%
Geographic Breakdown
United States
45.9%
Britain
23.1%
France
8.9%
Ireland
6.3%
Japan
3.6%
Netherlands
3.2%
Germany
2.8%
Luxembourg
2.5%
Bermuda
1.9%
Curacao
1.8%
Sector Breakdown
Finance
12.6%
Distribution Services
11.2%
Producer Manufacturing
10.5%
Consumer Non-Durables
10.4%
Consumer Services
7.8%
Technology Services
7.2%
Commercial Services
6.5%
Health Technology
6.5%
Retail Trade
6.2%
Cash & Other
21.1%
Updated Prospectus Web Address https://www.fmimgt.com/global-fund/
[1]
** Amount shown reflects the expenses of the FMI Global Fund from its December 31, 2024 inception date through  September 30, 2025. Expenses would be higher if the Fund had been in operation for the full fiscal year.
[2]
* Annualized