The tables below describe the fees and expenses that you may pay if you buy, hold, and sell Investor or Institutional Class Shares of the Mid Cap 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 (fees paid directly from your investment)	Investor Class Shares	Institutional Class Shares
Maximum Sales Charge (Load) Imposed on Purchases	None		None
Maximum Deferred Sales Charge (Load)	None		None
Maximum Sales Charge (Load) Imposed on Reinvested Distributions	None		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)	2%		2%
Exchange Fee	None		None

Annual Fund Operating Expenses [Table]

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)	Investor Class Shares		Institutional Class Shares
Management Fees		0.75%		0.75%
Distribution (12b-1) Fees		0.19%⁽¹⁾		None
Other Expenses		0.24%		0.24%
Total Annual Fund Operating Expenses		1.18%		0.99%
Fee Waiver and/or Expense Reimbursement		-0.08%		-0.14%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement⁽²⁾		1.10%		0.85%

⁽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⁾Pursuant to an operating expense limitation agreement between Heartland Advisors, Inc. (“Heartland Advisors”) and Heartland, on behalf of the Fund, Heartland Advisors has agreed to waive its management fees and/or pay expenses of the Fund to ensure that the Fund’s total annual fund operating expenses (excluding front-end or contingent deferred sales loads, taxes, leverage, interest, brokerage commissions, expenses incurred in connection with any merger or reorganization, dividends or interest expenses on short positions, acquired fund fees and expenses, or extraordinary expenses) do not exceed 1.10% of the Fund’s average daily net assets for the Investor Class Shares and 0.85% for the Institutional Class Shares through at least April 5, 2027, and subject to the annual renewal of the agreement by the Board of Directors thereafter. This operating expense limitation agreement can be terminated only with the consent of the Board of Directors.

Expense Example Narrative [Text Block]

This example is intended to help you compare the cost of investing in the Mid Cap 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. The fee waiver/expense reimbursement arrangement discussed in the previous table is reflected through April 5, 2027. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover [Heading]

PORTFOLIO TURNOVER

Portfolio Turnover, Rate

62.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell Investor or Institutional Class Shares of the Value Plus 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 [Table]

SHAREHOLDER FEES (fees paid directly from your investment)	Investor Class Shares		Institutional Class Shares
Maximum Sales Charge (Load) Imposed on Purchases		None		None
Maximum Deferred Sales Charge (Load)		None		None
Maximum Sales Charge (Load) Imposed on Reinvested Distributions		None		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)		2%		2%
Exchange Fee		None		None

Annual Fund Operating Expenses [Table]

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)	Investor Class Shares		Institutional Class Shares
Management Fees		0.70%		0.70%
Distribution (12b-1) Fees		0.24%⁽¹⁾		None
Other Expenses		0.27%		0.24%
Total Annual Fund Operating Expenses		1.21%		0.94%⁽²⁾

⁽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 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.

Expense Example Narrative [Text Block]

This example is intended to help you compare the cost of investing in the Value Plus 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:

Portfolio Turnover [Heading]

PORTFOLIO TURNOVER

Portfolio Turnover, Rate

68.00%

Prospectus [Line Items]

Expense Narrative [Text Block]

The tables below describe 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 [Table]

SHAREHOLDER FEES (fees paid directly from your investment)	Investor Class Shares		Institutional Class Shares
Maximum Sales Charge (Load) Imposed on Purchases		None		None
Maximum Deferred Sales Charge (Load)		None		None
Maximum Sales Charge (Load) Imposed on Reinvested Distributions		None		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)		2%		2%
Exchange Fee		None		None

Annual Fund Operating Expenses [Table]

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)	Investor Class Shares		Institutional Class Shares
Management Fees		0.75%		0.75%
Distribution (12b-1) Fees		0.13%⁽¹⁾		None
Other Expenses		0.18%		0.16%
Total Annual Fund Operating Expenses		1.06%		0.91%

⁽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.

Expense Example Narrative [Text Block]

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:

Portfolio Turnover [Heading]

PORTFOLIO TURNOVER

Portfolio Turnover, Rate

34.00%