Class A Class C and Investor Class [Member] Fees and Expenses - Class A, Class C and Investor Class - Meridian Small Cap Growth Fund	Jun. 30, 2026
Prospectus [Line Items]
Expense Heading [Optional Text]	Fees and Expenses of the Fund
Expense Narrative [Text Block]	This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables or examples below.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]	Please note that Total Annual Fund Operating Expenses in the table above may not correlate to the ratio of Operating Expenses Before Waivers/Reimbursements/Reductions to Average Net Assets found in the “Financial Highlights” section of this prospectus since the latter reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
Shareholder Fees Caption [Optional Text]	Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text]	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading]	Example
Expense Example Narrative [Text Block]	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 Class A shares, Class C shares or Investor Class shares of 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, the Fund’s operating expenses remain the same and the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement and Recoupment shown above will only be in place for the length of the current commitment. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block]	You would pay the following expenses if you did not redeem your shares of the Fund:
Portfolio Turnover [Heading]	Portfolio Turnover
Portfolio Turnover [Text Block]	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 the Fund’s 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. For the fiscal year ended June 30, 2026, the Fund’s portfolio turnover rate was 62% of the average value of its portfolio.
Portfolio Turnover, Rate	62.00%

Class A Class C and Investor Class [Member] Fees and Expenses - Class A, Class C and Investor Class - Meridian Small Cap Growth Fund

Jun. 30, 2026

Fees and Expenses of the Fund

Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables or examples below.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

Please note that Total Annual Fund Operating Expenses in the table above may not correlate to the ratio of Operating Expenses Before Waivers/Reimbursements/Reductions to Average Net Assets found in the “Financial Highlights” section of this prospectus since the latter reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Optional Text]

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Expense Example [Heading]

Example

Expense Example Narrative [Text Block]

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 Class A shares, Class C shares or Investor Class shares of 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, the Fund’s operating expenses remain the same and the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement and Recoupment shown above will only be in place for the length of the current commitment. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption Narrative [Text Block]

You would pay the following expenses if you did not redeem your shares of the Fund:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

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 the Fund’s 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. For the fiscal year ended June 30, 2026, the Fund’s portfolio turnover rate was 62% of the average value of its portfolio.

Portfolio Turnover, Rate

62.00%