S000005594 [Member] Fees and Expenses - iMGP International Fund	Dec. 31, 2025
Prospectus [Line Items]
Expense Heading [Optional Text]	Fees and Expenses of the International 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 International Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
Operating Expenses Caption [Optional Text]	Annual 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 International Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the International 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 International Fund’s operating expenses remain the same. The cost for the International Fund reflects the net expenses of the International Fund that result from the contractual expense limitation in the first year only. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading]	Portfolio Turnover
Portfolio Turnover [Text Block]	The International 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 shares of the International Fund are held in a taxable account as compared to shares in investment companies that hold investments for a longer period. These costs, which are not reflected in annual fund operating expenses or in the example, affect the International Fund’s performance. During the most recent fiscal year, the International Fund’s portfolio turnover rate was 99% of the average value of its portfolio.
Portfolio Turnover, Rate	99.00%

S000005594 [Member] Fees and Expenses - iMGP International Fund

Dec. 31, 2025

Fees and Expenses of the International Fund

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

Operating Expenses Caption [Optional Text]

Annual 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 International Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the International 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 International Fund’s operating expenses remain the same. The cost for the International Fund reflects the net expenses of the International Fund that result from the contractual expense limitation in the first year only. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

The International 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 shares of the International Fund are held in a taxable account as compared to shares in investment companies that hold investments for a longer period. These costs, which are not reflected in annual fund operating expenses or in the example, affect the International Fund’s performance. During the most recent fiscal year, the International Fund’s portfolio turnover rate was 99% of the average value of its portfolio.

Portfolio Turnover, Rate

99.00%