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HEARTLAND VALUE FUND  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Heartland Value Fund
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] 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 [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy, hold, and sell Investor or Institutional Class Shares of the Value Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and example below.
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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] 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 Total 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 45% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 45.00%
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 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:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Value Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Value Fund invests primarily in common stocks of small companies with market capitalizations less than the largest companies in the Russell 2000® Value Index, and may invest a significant portion of its assets in micro-capitalization securities, generally those with market capitalizations of less than $500 million at the time of purchase. As of May 6, 2022, the largest market capitalizations of a company in the Russell 2000® Value Index was $6.4 billion.

 

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 [Text] rr_StrategyPortfolioConcentration The Value Fund invests primarily in common stocks of small companies with market capitalizations less than the largest companies in the Russell 2000® Value Index, and may invest a significant portion of its assets in micro-capitalization securities, generally those with market capitalizations of less than $500 million at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks of investing in the value fund
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Past Performance
Performance Narrative [Text Block] 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. Past performance (before and after taxes) does not guarantee future results. Updated 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 [Text] 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 [Text] rr_PerformanceAvailabilityPhone 1-800-432-7856
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress heartlandadvisors.com
Performance Past Does Not Indicate Future [Text] 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 [Text Block] rr_BarChartClosingTextBlock
Best Quarter: Worst Quarter:
2nd Quarter 2020.....30.51% 1st Quarter of 2020.....-35.44%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 30.51%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (35.44%)
Performance Table Heading rr_PerformanceTableHeading tABLE II  Value Fund - Average Annual Total Returns [for the periods ended 12/31/22]
Index No Deduction for Fees, Expenses, Taxes [Text] 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 or other tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).
Performance Table One Class of after Tax Shown [Text] 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 [Text Block] 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 or other tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). 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.
HEARTLAND VALUE FUND | Risk Not Insured [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank, nor insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other governmental agency.
HEARTLAND VALUE FUND | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock The principal risk of investing in the Value Fund is that its share price and investment return will fluctuate, and you could lose money.
HEARTLAND VALUE FUND | Management Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Management Risk. The ability of the Fund to meet its investment objective is directly related to Heartland Advisors’ investment strategies for the Fund.
HEARTLAND VALUE FUND | General Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
HEARTLAND VALUE FUND | Common Stock Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock common stock 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.
HEARTLAND VALUE FUND | Value-Style Investing Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
HEARTLAND VALUE FUND | Smaller Company Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock SMALLER COMPANY SECURITIES RISK. Common stocks 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.
HEARTLAND VALUE FUND | Recent Market Events [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Recent Market Events. U.S. and international markets have experienced volatility in recent months and years due to a number of economic, political and global macro factors, including rising inflation, trade tensions, the war between Russia and Ukraine, disruption in the banking sector and the impact of the coronavirus (COVID-19) global pandemic. While U.S. and global economies are recovering from the effects of COVID-19, labor shortages and the inability to meet consumer demand have restricted growth. Uncertainties regarding the level of central banks’ interest rate increases, political events, rising government debt in the U.S. and the possibility of a national or global recession have also contributed to market volatility. Continuing market volatility may have an adverse effect on the Fund. Heartland Advisors will monitor developments and seek to manage the Fund in a manner consistent with achieving the Fund’s investment objective, but there can be no assurance that it will be successful in doing so.
HEARTLAND VALUE FUND | Sector Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
HEARTLAND VALUE FUND | Financials Sector Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
HEARTLAND VALUE FUND | Tax Law Change Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock TAX LAW change RISK. All statements contained in this Prospectus regarding the U.S. federal income tax consequences of an investment in the Fund are based on current law, which is subject to change at any time, potentially with retroactive effect. Legislation over the last few years, as well as possible future U.S. tax legislation and administrative guidance, could materially affect the tax consequences of your investment in the Fund and the Fund’s investments.
HEARTLAND VALUE FUND | Cybersecurity Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock CYBERSECURITY RISk. The Fund is susceptible to operational, information security, and related cybersecurity risks. Cyber incidents affecting the Fund or its service providers may cause disruptions and impact business operations, potentially resulting in financial losses, interference with the Fund’s ability to calculate its NAV, impediments to trading, the inability of shareholders to transact business, violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, or additional compliance costs.
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)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (14.48%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.13%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.48%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 10.40%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 28, 1984
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 Amount Redeemed) 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 0.09%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.09%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 111
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 347
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 601
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,327
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%)
Annual Return 2019 rr_AnnualReturn2019 17.96%
Annual Return 2020 rr_AnnualReturn2020 13.14%
Annual Return 2021 rr_AnnualReturn2021 21.81%
Annual Return 2022 rr_AnnualReturn2022 (9.99%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (9.99%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.15%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.89%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 10.94%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 28, 1984
HEARTLAND VALUE FUND | Investor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (10.63%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.79%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.13%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 9.16%
HEARTLAND VALUE FUND | Investor Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (5.48%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.86%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.17%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 9.07%
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 Amount Redeemed) 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 0.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.98%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 100
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 312
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 541
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,200
Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (9.91%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.30%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.06%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 11.02%
Average Annual Returns, 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.