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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Sep. 30, 2020
Entity Registrant Name dei_EntityRegistrantName KEELEY FUNDS, INC.
Entity Central Index Key dei_EntityCentralIndexKey 0001324203
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jan. 28, 2021
Document Effective Date dei_DocumentEffectiveDate Jan. 28, 2021
Prospectus Date rr_ProspectusDate Jan. 28, 2021
KEELEY Small Cap Dividend Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading KEELEY Small Cap Dividend Value Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The KEELEY Small Cap Dividend Value Fund (the “Fund”) seeks capital appreciation.

Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may also incur usual and customary brokerage commissions and other charges when buying and selling shares that are not reflected in the fee table and expense example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts is available from your financial professional, under the section “How Shares Are Priced” in the Fund’s Prospectus and under the section “Purchases and Redemption of Shares” in the Fund’s Statement of Additional Information (“SAI”).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES (FEES PAID DIRECTLY FROM YOUR INVESTMENT)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT YOU PAY EACH YEAR AS A PERCENTAGE OF THE VALUE OF YOUR INVESTMENT
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover. 
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 21% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 21.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example.  
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses are equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement in the first year and the Total Annual Fund Operating Expenses thereafter. This Example does not include the brokerage commissions that investors may pay to buy and sell Shares. Although your actual costs could be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES AND POLICIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund intends to pursue its investment objective by investing in equity securities of companies with a small market capitalization and that currently pay, or are reasonably expected to pay, dividends to shareholders. Under normal market conditions, the Fund will invest no less than 80% of its net assets (plus the amount of any borrowings for investment purposes) in “dividend-paying” common stocks and other equity type securities (including preferred stock, convertible debt securities and warrants) of “small cap” companies, which the Adviser currently defines as securities within the range of the Russell 2000® Value Index (the “Index”) at the time of investment. The market cap range of the Index changes daily, and as a result, the capitalization of small cap companies in which the Fund invests will also change. As of December 31, 2020, the market capitalization range of the Index was approximately $42.98 million to $15.47 billion.

“Dividend-paying” common stocks have one or more of the following characteristics: (i) attractive dividend yields that, in the opinion of the Adviser, are relatively stable or expected to grow; (ii) that pay a small dividend, but could grow their dividend over the next few years; and (iii) that pay no dividend, but may initiate a dividend or return cash to shareholders in other ways, such as a share repurchase program.

In making investment decisions for the Fund, the Adviser employs a “value” investment philosophy, which is based upon the belief that, at times, the market value of an asset may deviate from its underlying (“intrinsic”) value, and that the market price and the intrinsic value should converge over the long-term. The Fund seeks to invest in securities of small-cap, undervalued companies that meet certain criteria identified by the Adviser from time to time. The Adviser focuses its attention on particular kinds of undervalued stocks and constructs the Fund’s portfolio using a rigorous, “bottom-up” investment process that concentrates on individual companies (rather than on macroeconomic trends). The Adviser looks for stocks with sustainable, expected growth in earnings and dividends, and attempts to buy them when they are temporarily out-of-favor or undervalued by the market. Each stock is judged on its potential for above-average capital appreciation.

The Adviser believes that a track record of dividend increases is an excellent indicator of a company’s financial health and growth prospects, and that over the long-term, income can contribute significantly to total return. Dividends also can help reduce the Fund’s volatility during periods of market turbulence and can help offset losses when stock prices are falling. The Adviser reasonably expects that a company will pay a dividend or return cash to shareholders in other ways based upon the company’s operating history, its growth and profitability opportunities, and its history of sales, profits and dividend payments.

The Fund intends to pay the dividends it receives at least annually. It is the Adviser’s intention for the Fund typically to hold securities for more than two years. However, the Adviser may sell securities when a more attractive opportunity emerges, when a company becomes over-weighed in the portfolio, or when operating difficulties or other circumstances make selling desirable.

As long as an investment continues to meet the Fund’s criteria set forth above, the Fund may choose to hold such securities even if the company’s capitalization moves outside the Russell 2000® Value Index range. If less than 80% of the Fund’s net assets (plus the amount of any borrowings for investment purposes) are invested in such companies, the Fund will not invest in companies other than those with a small market capitalization until the 80% threshold is restored.

The Fund may be suitable for the more aggressive section of an investor’s portfolio. The Fund is designed for people who want to grow their capital over the long-term and who are comfortable with possible frequent short-term changes in the value of their investment. An investment in the Fund should not be considered a complete investment program.

Risk [Heading] rr_RiskHeading MAIN RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Loss of money is a risk of investing in the Fund.

Coronavirus (“COVID-19”) and Global Health Events. COVID-19 and concerns about its rapid spread and infections have severely impacted business activity in virtually all economies, markets, and sectors and negatively impacted the value of many financial and other assets. The duration of the COVID-19 outbreak and its effects cannot be determined with certainty. These events could have a significant impact on the Fund’s performance, as well as the performance and viability of issuers in which it invests.

Financial Services Risk. The Fund may invest from time to time in securities issued by financial services companies. Financial services companies can be significantly affected by changing economic conditions, demand for consumer loans, refinancing activity and intense competition, including price competition. Profitability can be largely dependent on the availability and cost of capital and the rate of consumer debt defaults, and can fluctuate significantly when interest rates change; unstable and/or rising interest rates may have a disproportionate effect on companies in the financial services sector. Financial services companies are subject to extensive government regulation, which can change frequently and may adversely affect the scope of their activities, the prices they can charge and the amount of capital they must maintain, or may affect them in other ways that are unforeseeable. In the past, financial services companies in general experienced considerable financial distress, which led to the implementation of government programs designed to ease that distress.

Equity Risk. The Fund is subject to the typical risks of equity investing, which include, but are not limited to: loss of money, company-specific risks, the effects of interest rate fluctuations, investor psychology and negative market or other general economic news. The value of your investment will increase or decrease, so your shares may be worth more or less money than your original investment.

Small Capitalization Company Risk. Investing in securities of small-cap companies presents more risks than investing in securities of more established or large-cap companies. Small-cap companies often have more limited resources and greater variation in operating results, leading to greater price volatility. Trading volumes may be lower, making such securities less liquid.

Dividend-Paying Stock Risk. The companies held by the Fund may reduce or stop paying dividends, which may affect the Fund’s ability to generate income. The Adviser’s approach in selecting dividend-paying securities may go out of favor with investors. This may cause the Fund to underperform relative to other mutual funds that do not emphasize dividend-paying stocks.

“Value Style” Investing Risk. Investing in undervalued companies, including companies undergoing restructuring or emerging from bankruptcy, presents special risks, since these companies must overcome the investing public’s negative perceptions, which may have resulted from any number of

catalysts or events, including but not limited to, declarations of bankruptcy or corporate restructurings. Often, such companies are subject to specific plans imposed by their lenders that they must meet in a fairly short time frame. Generally, companies going through corporate restructuring are more likely than others to remain undervalued. “Value style” investing may fall out of favor with investors and underperform other investment styles. Moreover, there can be no guarantee that the company’s market price will appreciate toward its intrinsic value, as estimated by the Adviser.

Market Sector Concentration Risk. In pursuing its investment strategy, the Fund, at times, may concentrate its investments in the securities of issuers in a particular industry or sector. By concentrating its investments in an industry or sector, the Fund may face more risks than if it were diversified broadly over numerous industries or sectors. Such industry-based risks may include, but are not limited to, general economic conditions or cyclical market patterns that could negatively affect supply and demand in a particular industry; competition for resources; adverse labor relations; political events; obsolescence of technologies; and increased competition. In addition, at times, an industry or sector may be out of favor and underperform other industries or the market as a whole.

Management Risk. If a portfolio manager is incorrect in the assessment of the growth prospects of the securities the Fund holds, then the value of the Fund’s shares may decline.

Risk Lose Money [Text] rr_RiskLoseMoney Loss of money is a risk of investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following performance information indicates some of the risks of investing in the Fund. The bar chart below shows how the Fund’s total return has varied from year to year. The table compares the Fund’s performance with that of the Russell 2000® Value Index, an unmanaged index that measures the performance of the small-cap value segment of the U.S. equity universe and includes those Russell 2000® Index companies with lower price-to-book ratios and lower forecasted growth values. The Russell 2000® Index is an unmanaged index that measures the performance of the smallest 2,000 companies by market capitalization of the Russell 3000® Index. While the information shown in the bar chart and the table gives you some idea of the risks involved in investing in the Fund, please remember that past performance (before and after taxes) does not guarantee future results. Updated performance information is available at www.keeleyfunds.com or toll-free at 1-800-422-3554.

Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-422-3554
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.keeleyfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture While the information shown in the bar chart and the table gives you some idea of the risks involved in investing in the Fund, please remember that past performance (before and after taxes) does not guarantee future results.
Bar Chart [Heading] rr_BarChartHeading KSDVX* - Year-by-year total return as of 12/31 each year (%)
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart and best and worst quarters shown above do not reflect the maximum 4.50% sales load. If these items reflected the sales load, returns would be less than those shown.
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock

*The information in the bar chart represents the performance of the Fund’s Class A Shares. Performance information for the Fund’s Class I Shares is not shown and the performance of that class will be different from the Fund’s Class A Shares because the expenses of each class are different.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

BEST QUARTER

​

WORST QUARTER

Q4 2020

​

32.28%

​

Q1 2020

​

(27.15)%

The bar chart and best and worst quarters shown above do not reflect the maximum 4.50% sales load. If these items reflected the sales load, returns would be less than those shown.
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads This performance table reflects the payment of the 4.50% sales load on the purchase of Class A Shares.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only Class A Shares and after-tax returns for Class I Shares will vary.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for only Class A Shares and after-tax returns for Class I Shares will vary.
KEELEY Small Cap Dividend Value Fund | Russell 2000® Value Index (reflects no deduction for fees, expenses and taxes,)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 4.63% [1]
5 Years rr_AverageAnnualReturnYear05 9.65% [1]
10 Years rr_AverageAnnualReturnYear10 8.66% [1]
KEELEY Small Cap Dividend Value Fund | Keeley Small Cap Dividend Value Fund - Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol KSDVX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.99%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.12% [2]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.64%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.23%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.41%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 587
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 923
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,281
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,288
Annual Return 2011 rr_AnnualReturn2011 3.45%
Annual Return 2012 rr_AnnualReturn2012 16.25%
Annual Return 2013 rr_AnnualReturn2013 29.85%
Annual Return 2014 rr_AnnualReturn2014 4.91%
Annual Return 2015 rr_AnnualReturn2015 (8.38%)
Annual Return 2016 rr_AnnualReturn2016 29.43%
Annual Return 2017 rr_AnnualReturn2017 7.27%
Annual Return 2018 rr_AnnualReturn2018 (20.33%)
Annual Return 2019 rr_AnnualReturn2019 22.36%
Annual Return 2020 rr_AnnualReturn2020 3.58%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel BEST QUARTER
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 32.28%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel WORST QUARTER
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (27.15%)
1 Year rr_AverageAnnualReturnYear01 (1.11%) [1]
5 Years rr_AverageAnnualReturnYear05 7.00% [1]
10 Years rr_AverageAnnualReturnYear10 7.73% [1]
KEELEY Small Cap Dividend Value Fund | Keeley Small Cap Dividend Value Fund - Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (1.58%) [1],[4],[5]
5 Years rr_AverageAnnualReturnYear05 5.80% [1],[4],[5]
10 Years rr_AverageAnnualReturnYear10 6.56% [1],[4],[5]
KEELEY Small Cap Dividend Value Fund | Keeley Small Cap Dividend Value Fund - Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (0.48%) [1],[4],[5]
5 Years rr_AverageAnnualReturnYear05 5.37% [1],[4],[5]
10 Years rr_AverageAnnualReturnYear10 6.11% [1],[4],[5]
KEELEY Small Cap Dividend Value Fund | Keeley Small Cap Dividend Value Fund - Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol KSDIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.99%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.12% [2]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.39%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.23%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.16%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 118
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 417
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 739
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,649
1 Year rr_AverageAnnualReturnYear01 3.92% [1]
5 Years rr_AverageAnnualReturnYear05 8.27% [1]
10 Years rr_AverageAnnualReturnYear10 8.51% [1]
KEELEY Small-Mid Cap Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading KEELEY Small-Mid Cap Value Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The KEELEY Small-Mid Cap Value Fund (the “Fund”) seeks capital appreciation.

Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may also incur usual and customary brokerage commissions and other charges when buying and selling shares that are not reflected in the fee table and expense example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts is available from your financial professional, under the section “How Shares Are Priced” in the Fund’s Prospectus and under the section “Purchases and Redemption of Shares” in the Fund’s Statement of Additional Information (“SAI”).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES (FEES PAID DIRECTLY FROM YOUR INVESTMENT)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT YOU PAY EACH YEAR AS A PERCENTAGE OF THE VALUE OF YOUR INVESTMENT
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover.
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 21% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 21.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Please note that the amount of Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement shown in the above table may differ from the ratio of expenses to average net assets included in the “Financial Highlights” section of this Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as acquired fund fees and expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example.  
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses are equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement in the first year and the Total Annual Fund Operating Expenses thereafter. This Example does not include the brokerage commissions that investors may pay to buy and sell Shares. Although your actual costs could be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES AND POLICIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund intends to pursue its investment objective by investing in equity securities of companies with small or mid-sized market capitalizations. Under normal market conditions, the Fund will invest no less than 80% of its net assets (plus the amount of any borrowings for investment purposes) in common stocks and other equity type securities (including preferred stock, convertible debt securities and warrants) of “small cap” or “mid cap” companies, which the Adviser currently defines as securities within the range of the Russell 2500® Value Index (the “Index”) at the time of investment. The market cap range of the Index changes daily, and as a result, the capitalization of small and mid-cap companies in which the Fund invests will also change. As of December 31, 2020, the market capitalization range of the Index was approximately $42.98 million to $30.57 billion.

In making investment decisions for the Fund, the Adviser employs a “value” investment philosophy, which is based upon the belief that, at times, the market value of an asset may deviate from its underlying (“intrinsic”) value, and that the market price and the intrinsic value should converge over the long-term. The Adviser focuses its attention on particular kinds of undervalued stocks and constructs the Fund’s portfolio using a rigorous, “bottom-up” investment process that concentrates on individual companies (rather than on macroeconomic trends), particularly those undergoing major changes (for example, corporate restructuring), including:

•corporate spin-offs (tax-free distributions of a parent company’s division to shareholders);

•financial restructuring, including acquisitions, recapitalizations and companies emerging from bankruptcy;

•savings and loan and insurance conversions from mutual to stock companies; and

•event driven, special situations that may create enhanced opportunities through industry and/or corporate dislocation (for example, overall industry change or restructuring, the presence of undervalued assets, or corporate or management change).

As part of this process, the Adviser conducts extensive research into, and analyses of, each candidate company’s business fundamentals, seeking undervalued companies that meet certain criteria identified by the Adviser from time to time. Each stock is judged on its potential for above-average capital appreciation. The Adviser does not take into account current dividend or interest income when choosing securities for the Fund. The Adviser continuously monitors each holding in the Fund’s portfolio and adjusts its view on the intrinsic value of such securities, as necessary, to reflect changes in a company’s fundamentals.

It is the Adviser’s intention for the Fund typically to hold securities for more than two years to allow the corporate restructuring process to yield results. The Adviser usually sells a stock when the market price meets or exceeds the Adviser’s estimate of the stock’s intrinsic value. However, the Adviser may sell securities for a number of reasons, including when a more attractive opportunity emerges, when a company’s fundamentals deteriorate and impair the long-term quality of the company’s business, when a company becomes over-weighted in the portfolio, when operating difficulties or other circumstances make selling desirable, or when the Adviser’s investment thesis otherwise no longer holds for the security.

As long as an investment continues to meet the Fund’s criteria set forth above, the Fund may choose to hold such securities even if the company’s capitalization moves outside the Russell 2500® Value Index range. If less than 80% of the Fund’s net assets (plus the amount of any borrowings for investment purposes) are invested in companies with a small or a mid-size market capitalization, the Fund will not invest in companies other than those with a small or a mid-size market capitalization until the 80% threshold is restored.

The Fund may be suitable for the more aggressive section of an investor’s portfolio. The Fund is designed for people who want to grow their capital over the long-term and who are comfortable with possible frequent short-term changes in the value of their investment. An investment in the Fund should not be considered a complete investment program.

Risk [Heading] rr_RiskHeading MAIN RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Loss of money is a risk of investing in the Fund.

Coronavirus (“COVID-19”) and Global Health Events. COVID-19 and concerns about its rapid spread and infections have severely impacted business activity in virtually all economies, markets, and sectors and negatively impacted the value of many financial and other assets. The duration of the COVID-19 outbreak and its effects cannot be determined with certainty. These events could have a significant impact on the Fund’s performance, as well as the performance and viability of issuers in which it invests.

Equity Risk. The Fund is subject to the typical risks of equity investing, which include, but are not limited to: loss of money, company-specific risks, the effects of interest rate fluctuations, investor psychology and negative market or other general economic news. The value of your investment will increase or decrease, so your shares may be worth more or less money than your original investment.

Small and Mid-Capitalization Company Risk. Investing in securities of small- and mid-cap companies presents more risks than investing in securities of more established or large-cap companies. Smaller companies often have more limited resources and greater variation in operating results, leading to greater price volatility. Trading volumes may be lower, making such securities less liquid. Small- and mid-cap companies may have a shorter history of operations or less diversified product lines — making them more susceptible to market pressures. During some periods, stocks of small and mid-sized companies, as an asset class, have underperformed the stocks of larger companies.

“Value Style” Investing Risk. Investing in undervalued companies, including companies undergoing restructuring or emerging from bankruptcy, presents special risks, since these companies must overcome the investing public’s negative perceptions, which may have resulted from any number of catalysts or events, including but not limited to, declarations of bankruptcy or corporate restructurings. Often, such companies are subject to specific plans imposed by their lenders that they must meet in a fairly short time frame. Generally, companies going through corporate restructuring are more likely than others to remain undervalued. “Value style” investing may fall out of favor with investors and underperform other investment styles. Moreover, there can be no guarantee that the company’s market price will appreciate toward its intrinsic value, as estimated by the Adviser.

Market Sector Concentration Risk. In pursuing its investment strategy, the Fund, at times, may concentrate its investments in the securities of issuers in a particular industry or sector. By concentrating its investments in an industry or sector, the Fund may face more risks than if it were diversified broadly over numerous industries or sectors. Such industry-based risks may include, but are not limited to, general economic conditions or cyclical market patterns that could negatively affect supply and demand in a particular industry; competition for resources; adverse labor relations; political events; obsolescence of technologies; and increased competition. In addition, at times, an industry or sector may be out of favor and underperform other industries or the market as a whole.

Management Risk. If a portfolio manager is incorrect in the assessment of the growth prospects of the securities the Fund holds, then the value of the Fund’s shares may decline.

Risk Lose Money [Text] rr_RiskLoseMoney Loss of money is a risk of investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following performance information indicates some of the risks of investing in the Fund. The bar chart below shows how the Fund’s total return has varied from year to year. The table compares the Fund’s performance with that of the Russell 2500® Value Index, an unmanaged index that measures the performance of the small to mid-cap value segment of the U.S. equity universe and includes those Russell 2500® Index companies with lower price-to-book ratios and lower forecasted growth values. The Russell 2500® Index is an unmanaged index that measures the performance of the 2,500 smallest companies by market capitalization of the Russell 3000® Index. While the information shown in the bar chart and the table gives you some idea of the risks involved in investing in the Fund, please remember that past performance (before and after taxes) does not guarantee future results. Updated performance information is available at www.keeleyfunds.com or toll-free at 1-800-422-3554.

Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-422-3554
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.keeleyfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture While the information shown in the bar chart and the table gives you some idea of the risks involved in investing in the Fund, please remember that past performance (before and after taxes) does not guarantee future results.
Bar Chart [Heading] rr_BarChartHeading KSMVX* - Year-by-year total return as of 12/31 each year (%)
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart and best and worst quarters shown above do not reflect the maximum 4.50% sales load. If these items reflected the sales load, returns would be less than those shown.
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock

*The information in the bar chart represents the performance of the Fund’s Class A Shares. Performance information for the Fund’s Class I Shares is not shown and the performance of that class will be different from the Fund’s Class A Shares because the expenses of each class are different.

Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

 

BEST QUARTER

​

WORST QUARTER

Q4 2020

​

29.65%

​

Q1 2020

​

(31.27)%

The bar chart and best and worst quarters shown above do not reflect the maximum 4.50% sales load. If these items reflected the sales load, returns would be less than those shown.
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads This performance table reflects the payment of the 4.50% sales load on the purchase of Class A Shares.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only Class A Shares and after-tax returns for Class I Shares will vary.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for only Class A Shares and after-tax returns for Class I Shares will vary.
KEELEY Small-Mid Cap Value Fund | Russell 2500® Value Index (reflects no deduction for fees, expenses and taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 4.88% [6]
5 Years rr_AverageAnnualReturnYear05 9.43% [6]
10 Years rr_AverageAnnualReturnYear10 9.33% [6]
KEELEY Small-Mid Cap Value Fund | Keeley Small-Mid Cap Value Fund - Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol KSMVX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.43%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02% [7]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.70%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.29%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.41%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 587
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 935
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,305
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,345
Annual Return 2011 rr_AnnualReturn2011 (4.39%)
Annual Return 2012 rr_AnnualReturn2012 29.69%
Annual Return 2013 rr_AnnualReturn2013 37.80%
Annual Return 2014 rr_AnnualReturn2014 0.31%
Annual Return 2015 rr_AnnualReturn2015 (11.01%)
Annual Return 2016 rr_AnnualReturn2016 20.64%
Annual Return 2017 rr_AnnualReturn2017 17.76%
Annual Return 2018 rr_AnnualReturn2018 (21.55%)
Annual Return 2019 rr_AnnualReturn2019 31.65%
Annual Return 2020 rr_AnnualReturn2020 0.63%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel BEST QUARTER
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 29.65%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel WORST QUARTER
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (31.27%)
1 Year rr_AverageAnnualReturnYear01 (3.93%) [6]
5 Years rr_AverageAnnualReturnYear05 8.11% [6]
10 Years rr_AverageAnnualReturnYear10 8.46% [6]
KEELEY Small-Mid Cap Value Fund | Keeley Small-Mid Cap Value Fund - Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (5.11%) [6],[9]
5 Years rr_AverageAnnualReturnYear05 5.45% [6],[9]
10 Years rr_AverageAnnualReturnYear10 6.41% [6],[9]
KEELEY Small-Mid Cap Value Fund | Keeley Small-Mid Cap Value Fund - Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (1.51%) [6],[9]
5 Years rr_AverageAnnualReturnYear05 6.16% [6],[9]
10 Years rr_AverageAnnualReturnYear10 6.62% [6],[9]
KEELEY Small-Mid Cap Value Fund | Keeley Small-Mid Cap Value Fund - Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol KSMIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.43%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02% [7]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.45%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.29%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.16%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 118
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 430
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 765
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,710
1 Year rr_AverageAnnualReturnYear01 0.86% [6]
5 Years rr_AverageAnnualReturnYear05 9.38% [6]
10 Years rr_AverageAnnualReturnYear10 9.23% [6]
KEELEY Mid Cap Dividend Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading KEELEY Mid Cap Dividend Value Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The KEELEY Mid Cap Dividend Value Fund (the “Fund”) seeks capital appreciation.

Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may also incur usual and customary brokerage commissions and other charges when buying and selling shares that are not reflected in the fee table and expense example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts is available from your financial professional, under the section “How Shares Are Priced” in the Fund’s Prospectus and under the section “Purchases and Redemption of Shares” in the Fund’s Statement of Additional Information (“SAI”).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FESS (FEES PAID DIRECTLY FROM YOUR INVESTMENT)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT YOU PAY EACH YEAR AS A PERCENTAGE OF THE VALUE OF YOUR INVESTMENT
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover.
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 22% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 22.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example.
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses are equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement in the first year and the Total Annual Fund Operating Expenses thereafter. This Example does not include the brokerage commissions that investors may pay to buy and sell Shares. Although your actual costs could be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES AND POLICIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund intends to pursue its investment objective by investing in equity securities of companies with a mid-size market capitalization and that currently pay, or are reasonably expected to pay, dividends to shareholders. Under normal market conditions, the Fund will invest no less than 80% of its net assets (plus the amount of any borrowings for investment purposes) in “dividend-paying” common stocks and other equity type securities (including preferred stock, convertible debt securities and warrants) of “mid cap” companies, which the Adviser currently defines as securities within the range of the Russell Midcap® Value Index (the “Index”) at the time of investment. The market cap range of the Index changes daily, and as a result, the capitalization of mid-cap companies in which the Fund invests will also change. As of December 31, 2020, the market capitalization range of the Index was approximately $584.59 million to $51.33 billion.

“Dividend-paying” common stocks have one or more of the following characteristics: (i) attractive dividend yields that, in the opinion of the Adviser, are relatively stable or expected to grow; (ii) that pay a small dividend, but could grow their dividend over the next few years; and (iii) that pay no dividend, but may initiate a dividend or return cash to shareholders in other ways, such as a share repurchase program.

In making investment decisions for the Fund, the Adviser employs a “value” investment philosophy, which is based upon the belief that, at times, the market value of an asset may deviate from its underlying (“intrinsic”) value, and that the market price and the intrinsic value should converge over the long-term. The Fund seeks to invest in securities of mid-cap, undervalued companies that meet certain criteria identified by the Adviser from time to time. The Adviser focuses its attention on particular kinds of undervalued stocks and constructs the Fund’s portfolio using a rigorous, “bottom-up” investment process that concentrates on individual companies (rather than on macroeconomic trends). The Adviser looks for stocks with sustainable, expected growth in earnings and dividends, and attempts to buy them when they are temporarily out-of-favor or undervalued by the market. Each stock is judged on its potential for above-average capital appreciation.

The Adviser believes that a track record of dividend increases is an excellent indicator of a company’s financial health and growth prospects, and that over the long-term, income can contribute significantly to total return. Dividends also can help reduce the Fund’s volatility during periods of market turbulence and can help offset losses when stock prices are falling. The Adviser reasonably expects that a company will pay a dividend or return cash to shareholders in other ways based upon the company’s operating history, its growth and profitability opportunities, and its history of sales, profits and dividend payments.

The Fund intends to pay the dividends it receives at least annually. It is the Adviser’s intention for the Fund typically to hold securities for more than two years. However, the Adviser may sell securities when a more attractive opportunity emerges, when a company becomes over-weighed in the portfolio, or when operating difficulties or other circumstances make selling desirable.

As long as an investment continues to meet the Fund’s other investment criteria set forth above, the Fund may choose to hold such securities even if the company’s capitalization moves outside the Russell Midcap® Value Index range. If less than 80% of the Fund’s net assets (plus the amount of any borrowings for investment purposes) are invested in companies with a mid-size market capitalization, the Fund will not invest in companies other than those with a mid-size market capitalization until the 80% threshold is restored.

The Fund may be suitable for the more aggressive section of an investor’s portfolio. The Fund is designed for people who want to grow their capital over the long-term and who are comfortable with possible frequent short-term changes in the value of their investment. An investment in the Fund should not be considered a complete investment program.

Risk [Heading] rr_RiskHeading MAIN RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Loss of money is a risk of investing in the Fund.

Coronavirus (“COVID-19”) and Global Health Events. COVID-19 and concerns about its rapid spread and infections have severely impacted business activity in virtually all economies, markets, and sectors and negatively impacted the value of many financial and other assets. The duration of the COVID-19 outbreak and its effects cannot be determined with certainty. These events could have a significant impact on the Fund’s performance, as well as the performance and viability of issuers in which it invests.

Equity Risk. The Fund is subject to the typical risks of equity investing, which include, but are not limited to: loss of money, company-specific risks, the effects of interest rate fluctuations, investor psychology and negative market or other general economic news. The value of your investment will increase or decrease, so your shares may be worth more or less money than your original investment.

Mid-Capitalization Company Risk. Investing in mid-cap securities presents more risk than investing in more established or large-cap company securities. Mid-cap companies often have more limited resources and greater variation in operating results, leading to greater price volatility. Trading volumes may be lower, making such securities less liquid.

“Value Style” Investing Risk. Investing in undervalued companies, including companies undergoing restructuring or emerging from bankruptcy, presents special risks, since these companies must overcome the investing public’s negative perceptions, which may have resulted from any number of catalysts or events, including but not limited to, declarations of bankruptcy or corporate restructurings. Often, such companies are subject to specific plans imposed by their lenders that they must meet in a fairly short time frame. Generally, companies going through corporate restructuring are more likely than others to remain undervalued. “Value style” investing may fall out of favor with investors and underperform other investment styles. Moreover, there can be no guarantee that the company’s market price will appreciate toward its intrinsic value, as estimated by the Adviser.

Dividend-Paying Stock Risk. The companies held by the Fund may reduce or stop paying dividends, which may affect the Fund’s ability to generate income. The Adviser’s approach in selecting dividend-paying securities may go out of favor with investors. This may cause the Fund to underperform relative to other mutual funds that do not emphasize dividend-paying stocks.

Market Sector Concentration Risk. In pursuing its investment strategy, the Fund, at times, may concentrate its investments in the securities of issuers in a particular industry or sector. By concentrating its investments in an industry or sector, the Fund may face more risks than if it were diversified broadly

over numerous industries or sectors. Such industry-based risks may include, but are not limited to, general economic conditions or cyclical market patterns that could negatively affect supply and demand in a particular industry; competition for resources; adverse labor relations; political events; obsolescence of technologies; and increased competition. In addition, at times, an industry or sector may be out of favor and underperform other industries or the market as a whole.

Management Risk. If a portfolio manager is incorrect in the assessment of the growth prospects of the securities the Fund holds, then the value of the Fund’s shares may decline.

Risk Lose Money [Text] rr_RiskLoseMoney Loss of money is a risk of investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following performance information indicates some of the risks of investing in the Fund. The bar chart below shows how the Fund’s total return has varied from year to year. The table compares the Fund’s performance with that of the Russell Midcap® Value Index, an unmanaged index that measures the performance of the mid-cap value segment of the U.S. equity universe and includes those Russell Midcap Index companies with lower price-to-book ratios and lower forecasted growth values. The Russell Midcap® Index is an unmanaged index that measures the performance of the 800 smallest companies by market capitalization of the Russell 1000® Index. While the information shown in the bar chart and the table gives you some idea of the risks involved in investing in the Fund, please remember that past performance (before and after taxes) does not guarantee future results. Updated performance information is available at www.keeleyfunds.com or toll-free at 1-800-422-3554.

Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-422-3554
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.keeleyfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture While the information shown in the bar chart and the table gives you some idea of the risks involved in investing in the Fund, please remember that past performance (before and after taxes) does not guarantee future results.
Bar Chart [Heading] rr_BarChartHeading KMDVX* - Year-by-year total return as of 12/31 each year (%)
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart and best and worst quarters shown above do not reflect the maximum 4.50% sales load. If these items reflected the sales load, returns would be less than those shown.
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock

*The information in the bar chart represents the performance of the Fund’s Class A Shares. Performance information for the Fund’s Class I Shares is not shown and the performance of that class will be different from the Fund’s Class A Shares because the expenses of each class are different.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

BEST QUARTER

​

WORST QUARTER

Q4 2020

​

21.39%

​

Q1 2020

​

(24.07)%
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads This performance table reflects the payment of the 4.50% sales load on the purchase of Class A Shares.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only Class A Shares and after-tax returns for Class I Shares will vary.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for only Class A Shares and after-tax returns for Class I Shares will vary.
KEELEY Mid Cap Dividend Value Fund | Russell Midcap® Value Index (reflects no deduction for fees, expenses and taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 4.96% [10]
5 Years rr_AverageAnnualReturnYear05 9.73% [10]
Since Inception rr_AverageAnnualReturnSinceInception 13.58% [10]
KEELEY Mid Cap Dividend Value Fund | Keeley Mid Cap Dividend Value Fund - Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol KMDVX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90% [11]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.25%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.40%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.20%) [11]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.20% [11]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 567
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 854
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,163
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,038
Annual Return 2012 rr_AnnualReturn2012 15.04%
Annual Return 2013 rr_AnnualReturn2013 34.66%
Annual Return 2014 rr_AnnualReturn2014 11.00%
Annual Return 2015 rr_AnnualReturn2015 (4.47%)
Annual Return 2016 rr_AnnualReturn2016 23.80%
Annual Return 2017 rr_AnnualReturn2017 15.69%
Annual Return 2018 rr_AnnualReturn2018 (16.76%)
Annual Return 2019 rr_AnnualReturn2019 25.61%
Annual Return 2020 rr_AnnualReturn2020 (1.77%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel BEST QUARTER
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 21.39%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel WORST QUARTER
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.07%)
1 Year rr_AverageAnnualReturnYear01 (6.20%) [10]
5 Years rr_AverageAnnualReturnYear05 8.02% [10]
Since Inception rr_AverageAnnualReturnSinceInception 11.55% [10]
KEELEY Mid Cap Dividend Value Fund | Keeley Mid Cap Dividend Value Fund - Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (6.51%) [10],[12],[13]
5 Years rr_AverageAnnualReturnYear05 7.55% [10],[12],[13]
Since Inception rr_AverageAnnualReturnSinceInception 10.96% [10],[12],[13]
KEELEY Mid Cap Dividend Value Fund | Keeley Mid Cap Dividend Value Fund - Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (3.54%) [10],[12],[13]
5 Years rr_AverageAnnualReturnYear05 6.27% [10],[12],[13]
Since Inception rr_AverageAnnualReturnSinceInception 9.45% [10],[12],[13]
KEELEY Mid Cap Dividend Value Fund | Keeley Mid Cap Dividend Value Fund - Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol KMDIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90% [11]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.25%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.15%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.20%) [11]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.95% [11]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 346
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 614
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,380
1 Year rr_AverageAnnualReturnYear01 (1.53%) [10]
5 Years rr_AverageAnnualReturnYear05 9.29% [10]
Since Inception rr_AverageAnnualReturnSinceInception 12.38% [10]
[1] This performance table reflects the payment of the 4.50% sales load on the purchase of Class A Shares.
[2] “Acquired Fund Fees and Expenses” are indirect fees and expenses that the Fund incurs from investing in the shares of other investment companies. Please note that the amount of Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement shown in the above table may differ from the ratio of expenses to average net assets included in the “Financial Highlights” section of this Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as acquired fund fees and expenses.
[3] The Fund’s adviser, Keeley-Teton Advisors, LLC (the “Adviser”), has contractually agreed to waive a portion of its management fee or reimburse the Fund to the extent that total ordinary operating expenses during the current fiscal year as a percentage of average net assets for the Fund exceed 1.29% for Class A Shares and 1.04% for Class I Shares. The waiver excludes expenses related to taxes, interest charges, dividend expenses incurred on securities that the Fund sells short, litigation expenses, other extraordinary expenses, any costs that the Fund incurs from investments in other investment companies, and brokerage commissions and other charges relating to the purchase and sale of the Fund’s portfolio securities. However, the repayment of previously waived expenses is limited to amounts that do not cause the aggregate operating expenses of the Fund to exceed the current expense cap or the expense cap in place at the time the waiver was generated. The waiver is in effect through February 28, 2022, and the Adviser cannot discontinue the agreement prior to its expiration.
[4] After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only Class A Shares and after-tax returns for Class I Shares will vary.
[5] After tax returns as of December 31, 2020 may be higher or lower than the performance shown above due to the ultimate tax characterization of REITs held in the Fund’s portfolio.
[6] This performance table reflects the payment of the 4.50% sales load on the purchase of Class A Shares.
[7] “Acquired Fund Fees and Expenses” are indirect fees and expenses that the Fund incurs from investing in the shares of other investment companies. Please note that the amount of Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement shown in the above table may differ from the ratio of expenses to average net assets included in the “Financial Highlights” section of this Prospectus, which reflects the operating expenses of the Fund and does not include indirect expenses such as acquired fund fees and expenses.
[8] The Fund’s adviser, Keeley-Teton Advisors, LLC (the “Adviser”), has contractually agreed to waive a portion of its management fee or reimburse the Fund to the extent that total ordinary operating expenses during the current fiscal year as a percentage of average net assets for the Fund exceed 1.39% for Class A Shares and 1.14% for Class I Shares. The waiver excludes expenses related to taxes, interest charges, dividend expenses incurred on securities that the Fund sells short, litigation expenses, other extraordinary expenses, any costs that the Fund incurs from investments in other investment companies, and brokerage commissions and other charges relating to the purchase and sale of the Fund’s portfolio securities. However, the repayment of previously waived expenses is limited to amounts that do not cause the aggregate operating expenses of the Fund to exceed the current expense cap or the expense cap in place at the time the waiver was generated. The waiver is in effect through February 28, 2022, and the Adviser cannot discontinue the agreement prior to its expiration.
[9] After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only Class A Shares and after-tax returns for Class I Shares will vary.
[10] This performance table reflects the payment of the 4.50% sales load on the purchase of Class A Shares.
[11] The Adviser, has contractually agreed to waive a portion of its management fee or reimburse the Fund to the extent that total ordinary operating expenses during the current fiscal year as a percentage of average net assets for the Fund exceed 1.20% for Class A Shares and 0.95% for Class I Shares. The waiver excludes expenses related to taxes, interest charges, dividend expenses incurred on securities that the Fund sells short, litigation expenses, other extraordinary expenses, any costs that the Fund incurs from investments in other investment companies, and brokerage commissions and other charges relating to the purchase and sale of the Fund’s portfolio securities. However, the repayment of previously waived expenses is limited to amounts that do not cause the aggregate operating expenses of the Fund to exceed the current expense cap or the expense cap in place at the time the waiver was generated. The waiver is in effect through February 28, 2022, and the Adviser cannot discontinue the agreement prior to its expiration.
[12] After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only Class A Shares and after-tax returns for Class I Shares will vary.
[13] After tax returns as of December 31, 2020 may be higher or lower than the performance shown above due to the ultimate tax characterization of REITs held in the Fund’s portfolio.