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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Entity Central Index Key dei_EntityCentralIndexKey 0000809586
HEARTLAND VALUE FUND (Prospectus Summary) | HEARTLAND VALUE FUND  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading HEARTLAND VALUE FUND
Investment Objective, Heading rr_ObjectiveHeading INVESTMENT GOAL
Investment Objective, Primary rr_ObjectivePrimaryTextBlock

The Value Fund seeks long-term capital appreciation through investing in small companies.
Expense, Heading rr_ExpenseHeading FEES AND EXPENSES OF THE VALUE FUND
Expense, Narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold Investor or Institutional Class Shares of the Value Fund.
Shareholder Fees, Caption rr_ShareholderFeesCaption SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses, Caption rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover rr_PortfolioTurnoverTextBlock

The Value 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 37% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 37.00%
Expense Example, Heading rr_ExpenseExampleHeading EXAMPLE.
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Value 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 remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Investment Strategy, Heading rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES OF THE VALUE FUND
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock

The Value Fund invests primarily in common stocks of small companies with market capitalizations of less than $2.5 billion selected on a value basis, and may invest a significant portion of its assets in micro-capitalization securities, generally those with market capitalizations of less than $300 million at the time of purchase.

 

The Fund utilizes Heartland Advisors' disciplined and time-tested 10 Principles of Value InvestingTM framework to identify securities with the potential for appreciation and a potential margin of safety to limit downside risk. The 10 Principles of Value Investing™ are: catalyst for recognition, low price in relation to earnings, low price in relation to cash flow, low price in relation to book value, financial soundness, positive earnings dynamics, sound business strategy, capable management and insider ownership, value of the company, and positive technical analysis.
Strategy Portfolio Concentration rr_StrategyPortfolioConcentration The Value Fund invests primarily in common stocks of small companies with market capitalizations of less than $2.5 billion selected on a value basis
Risk, Heading rr_RiskHeading PRINCIPAL RISKS OF INVESTING IN THE VALUE FUND
Risk, Narrative rr_RiskNarrativeTextBlock

The Value Fund is designed for investors who seek long-term capital appreciation from small company stocks. It is designed for investors who can tolerate the greater investment risk and market volatility associated with smaller companies, but want to manage these risks by investing in companies believed to be undervalued relative to their intrinsic value.

 

The principal risk of investing in the Value Fund is that its share price and investment return will fluctuate, and you could lose money. Additional principal investment risks of the Fund include:

 

-       MANAGEMENT RISK. The ability of the Fund to meet its investment objective is directly related to Heartland Advisors' investment strategies for the Fund.

 

-       SECTOR RISK. Although Heartland Advisors selects stocks based on their individual merits, some economic sectors will represent a larger portion of the Fund's overall investment portfolio than other sectors. Potential negative market or economic developments affecting one of the larger sectors could have a greater impact on the Fund than on a fund with less weighting in that sector.

 

o      Financials Sector Risk. Companies in the financials sector are subject to risks relating to regulatory change, decreased liquidity in credit markets and unstable interest rates.

 

-       GENERAL MARKET RISK. The market value of a security may move up or down, sometimes rapidly and unpredictably. These fluctuations may cause a security to be worth less than the price originally paid for it, or less than it was worth at an earlier time.

 

-       EQUITY MARKET RISK. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value as market confidence in and perceptions of their issuers change.

 

-       VALUE-STYLE INVESTING RISK. Value stocks can perform differently from the market as a whole and from other types of stocks. Value investments are subject to the risk that their intrinsic value may not be recognized by the broad market.

 

-       SMALLER COMPANY SECURITIES RISK. Equity securities of the smaller companies in which the Fund may invest generally involve a higher degree of risk than investments in the broad-based equity markets. The security prices of smaller companies generally are more volatile than those of larger companies, they generally will have less market liquidity, and they may be more likely to be adversely affected by poor economic or market conditions.

 

An investment in a Fund is not a deposit of a bank, nor insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other governmental agency. It is not designed to be a complete investment program, and while you may make money, you can also lose money. Each Fund's share price will fluctuate.
Risk, Lose Money rr_RiskLoseMoney The principal risk of investing in the Value Fund is that its share price and investment return will fluctuate, and you could lose money.
Risk, Not Insured Depository Institution rr_RiskNotInsuredDepositoryInstitution An investment in a Fund is not a deposit of a bank, nor insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other governmental agency.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading PAST PERFORMANCE
Performance, Narrative rr_PerformanceNarrativeTextBlock

The following tables show historical performance of the Value Fund and provide some indication of the risks of investing in the Fund. Table I shows how the total returns before taxes for the Fund's Investor Class Shares have varied from year to year for the past 10 years. Table II shows how the Fund's average annual total returns compare to those of a securities market index. Performance information for the Institutional Class Shares prior to May 1, 2008 is based on the performance of the Investor Class. Past performance (before and after taxes) does not guarantee future results. Recent performance information for the Fund is available on the Fund's website at heartlandadvisors.com or by calling 1-800-432-7856.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The following tables show historical performance of the Value Fund and provide some indication of the risks of investing in the Fund.
Performance, Availability Phone Number rr_PerformanceAvailabilityPhone 1-800-432-7856
Performance, Availability Website Address rr_PerformanceAvailabilityWebSiteAddress heartlandadvisors.com
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) does not guarantee future results.
Bar Chart, Heading rr_BarChartHeading TABLE I VALUE FUND - INVESTOR CLASS SHARES - YEAR-BY-YEAR TOTAL RETURNS
Bar Chart, Closing rr_BarChartClosingTextBlock

Best Quarter:

Worst Quarter:

2nd Quarter 2009….31.26%

3rd Quarter of 2011…..-20.83%
Performance Table Heading rr_PerformanceTableHeading TABLE II VALUE FUND - AVERAGE ANNUAL TOTAL RETURNS [FOR THE PERIODS ENDED 12/31/18]
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes reflects no deduction for fees, expenses or taxes
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and 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 rr_PerformanceTableOneClassOfAfterTaxShown In addition, after-tax returns are shown only for Investor Class Shares and after-tax returns for the Institutional Class Shares will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The differences in before-tax returns and after-tax returns on distributions and sale of Fund shares are due to adjustments incorporated into the after-tax returns for qualified taxable dividend income and qualifying foreign tax credits.
Performance Table Closing rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown, and 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. In addition, after-tax returns are shown only for Investor Class Shares and after-tax returns for the Institutional Class Shares will vary. The differences in before-tax returns and after-tax returns on distributions and sale of Fund shares are due to adjustments incorporated into the after-tax returns for qualified taxable dividend income and qualifying foreign tax credits. The Fund's return after taxes on distributions and sale of Fund shares may be higher than its return before taxes and its return after taxes on distributions because it may include a tax benefit resulting from capital losses that would have been incurred.
HEARTLAND VALUE FUND (Prospectus Summary) | HEARTLAND VALUE FUND | Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes)
One Year rr_AverageAnnualReturnYear01 (12.86%)
Five Years rr_AverageAnnualReturnYear05 3.61%
Ten Years rr_AverageAnnualReturnYear10 10.40%
Since Inception rr_AverageAnnualReturnSinceInception 10.58%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 28, 1984
HEARTLAND VALUE FUND (Prospectus Summary) | HEARTLAND VALUE FUND | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of the net asset value of any shares that are redeemed or exchanged within 10 days after they were purchased) rr_RedemptionFeeOverRedemption 2.00%
Exchange Fee rr_ExchangeFee none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25% [1]
Other Expenses rr_OtherExpensesOverAssets 0.07%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.07%
One Year rr_ExpenseExampleYear01 $ 109
Three Years rr_ExpenseExampleYear03 340
Five Years rr_ExpenseExampleYear05 590
Ten Years rr_ExpenseExampleYear10 $ 1,304
Annual Return 2009 rr_AnnualReturn2009 44.49%
Annual Return 2010 rr_AnnualReturn2010 21.28%
Annual Return 2011 rr_AnnualReturn2011 (6.92%)
Annual Return 2012 rr_AnnualReturn2012 13.83%
Annual Return 2013 rr_AnnualReturn2013 32.11%
Annual Return 2014 rr_AnnualReturn2014 2.22%
Annual Return 2015 rr_AnnualReturn2015 (11.04%)
Annual Return 2016 rr_AnnualReturn2016 16.31%
Annual Return 2017 rr_AnnualReturn2017 8.42%
Annual Return 2018 rr_AnnualReturn2018 (12.15%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 31.26%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.83%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
One Year rr_AverageAnnualReturnYear01 (12.15%)
Five Years rr_AverageAnnualReturnYear05 0.15%
Ten Years rr_AverageAnnualReturnYear10 9.47%
Since Inception rr_AverageAnnualReturnSinceInception 11.05%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 28, 1984
HEARTLAND VALUE FUND (Prospectus Summary) | HEARTLAND VALUE FUND | Investor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
One Year rr_AverageAnnualReturnYear01 (13.58%)
Five Years rr_AverageAnnualReturnYear05 (1.59%)
Ten Years rr_AverageAnnualReturnYear10 7.97%
Since Inception rr_AverageAnnualReturnSinceInception 9.22%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 28, 1984
HEARTLAND VALUE FUND (Prospectus Summary) | HEARTLAND VALUE FUND | Investor Class | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
One Year rr_AverageAnnualReturnYear01 (6.19%)
Five Years rr_AverageAnnualReturnYear05 0.06%
Ten Years rr_AverageAnnualReturnYear10 7.75%
Since Inception rr_AverageAnnualReturnSinceInception 9.22%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 28, 1984
HEARTLAND VALUE FUND (Prospectus Summary) | HEARTLAND VALUE FUND | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of the net asset value of any shares that are redeemed or exchanged within 10 days after they were purchased) rr_RedemptionFeeOverRedemption 2.00%
Exchange Fee rr_ExchangeFee none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.15%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.90% [2]
One Year rr_ExpenseExampleYear01 $ 92
Three Years rr_ExpenseExampleYear03 287
Five Years rr_ExpenseExampleYear05 498
Ten Years rr_ExpenseExampleYear10 $ 1,107
Label rr_AverageAnnualReturnLabel Return Before Taxes
One Year rr_AverageAnnualReturnYear01 (11.98%)
Five Years rr_AverageAnnualReturnYear05 0.31%
Ten Years rr_AverageAnnualReturnYear10 9.67%
Since Inception rr_AverageAnnualReturnSinceInception 11.12%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 28, 1984
[1] Investor Class Shares are subject to an annual distribution fee of up to 0.25% pursuant to a reimbursement plan adopted under Rule 12b-1. The maximum rate of the Rule 12b-1 fee may not be incurred in a given year.
[2] Heartland Advisors, Inc. ("Heartland Advisors") has voluntarily agreed to waive certain fees and/or reimburse certain expenses with respect to the Institutional Class Shares of the Fund, to the extent necessary to maintain the Institutional Class Shares' Total Annual Fund Operating Expenses at a ratio of 0.99% of average daily net assets. Heartland Advisors may modify or discontinue these waivers and/or reimbursements at any time without notice.