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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2022
Entity Registrant Name dei_EntityRegistrantName Impax Funds Series Trust I
Entity Central Index Key dei_EntityCentralIndexKey 0000076721
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Nov. 07, 2023
Document Effective Date dei_DocumentEffectiveDate Nov. 08, 2023
Prospectus Date rr_ProspectusDate Nov. 08, 2023
IMPAX GLOBAL SOCIAL LEADERS FUND  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Impax Global Social Leaders Fund (the “Global Social Leaders Fund”)   Summary of Key Information
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Global Social Leaders Fund’s investment objective is to seek long term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees & Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell Institutional Class or Investor Class shares of the Global Social Leaders Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples 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 you pay each year as a percentage of the value of your investment):
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 31, 2026
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

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 shares are held in a taxable account. These transaction costs, which are not reflected in “Annual Fund Operating Expenses” or in the “Example of Expenses,” affect the Fund’s performance. Because the Global Social Leaders Fund is a newly-formed fund that has yet to commence operations, no prior fiscal year turnover rate is available.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates “Other Expenses” are based on estimated amounts for the first full fiscal year.
Expense Example [Heading] rr_ExpenseExampleHeading Example of Expenses
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in Institutional Class or Investor Class shares of the Global Social Leaders Fund with the cost of investing in other mutual funds.

 

The table assumes that an investor invests $10,000 in Institutional Class or Investor Class shares of the Fund for the time periods indicated and then redeems all of his or her shares at the end of those periods. The table also assumes that the investment has a 5% return each year, that all dividends and distributions are reinvested and that the Fund’s operating expenses remain the same throughout those periods. The amounts shown reflect the contractual reimbursement noted in the Annual Fund Operating Expenses table for the first year. Although an investor’s actual expenses may be higher or lower than those shown in the table, based on these assumptions his or her expenses would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Global Social Leaders Fund seeks to invest in companies around the world whose products or services address societal challenges, including meeting basic needs, broadening economic participation and improving quality of life, and that demonstrate positive behaviors through policies and programs that foster diverse, inclusive and equitable workplace cultures. From this universe, the Sub-Adviser selects portfolio companies for the Fund that it determines are best positioned to deliver long-term growth of capital.

 

The Global Social Leaders Fund follows a sustainable investing approach, investing in companies that the Sub-Adviser believes are well positioned to benefit from the transition to a more sustainable global economy, integrating environmental, social and governance (“ESG”) analysis and ratings into portfolio construction and managing the portfolio within certain risk parameters (e.g., sector and regional exposure) relative to the Fund’s benchmark universe of MSCI ACWI Index companies.

 

Under normal market conditions, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of companies that the Fund’s Sub-Adviser has determined are “social leaders.” To identify social leaders, the Fund’s Sub-Adviser identifies a universe of companies that it has determined (1) derive significant revenues (i.e., at least 20% of revenues) from “social markets,” meaning products or services that address societal challenges, including meeting basic needs, such as food, water, and shelter, or essential services, such as transportation and utilities; broadening economic participation by enabling access to education, jobs, financial services and/or digital services; or improving quality of life through accessible and affordable health care and wellness; and (2) also demonstrate positive behaviors through policies and programs that foster diverse, inclusive and equitable workplace cultures. From this universe, the Fund’s Sub-Adviser selects portfolio companies for the Fund that it determines to be social leaders on a company-by-company basis primarily through the use of fundamental financial analysis, which includes an analysis of ESG factors that the Fund’s Sub-Adviser has determined are financially material. The Fund is not constrained by any particular investment style, and may therefore invest in “growth” stocks, “value” stocks or a combination of both. Additionally, it may buy stocks in any sector or industry, and it is not limited to investing in securities of a specific market capitalization.

 

Under normal market conditions, the Fund will invest primarily in equity securities (such as common stocks, preferred stocks and securities convertible into common and preferred stocks) of companies located around the world, including at least 40% of its net assets in securities of companies organized or located outside the United States or doing a substantial amount of business outside the United States, including those located in emerging markets. The Fund’s investments may be diversified across multiple countries or geographic regions, or may be focused on a select geographic region, although the Fund will normally have investments in a minimum of three countries other than the United States. The Fund’s investments in securities of non-US issuers may be denominated in currencies other than the US dollar. 
Risk [Heading] rr_RiskHeading Principal Risks 
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Because the Global Social Leaders Fund is a newly-formed fund that has yet to commence operations, no performance information is available.
IMPAX GLOBAL SOCIAL LEADERS FUND | Equity Securities Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Equity Securities Risk The market price of equity securities may fluctuate significantly, rapidly and unpredictably, causing the Fund to experience losses. The prices of equity securities generally are more volatile than the prices of debt securities.
IMPAX GLOBAL SOCIAL LEADERS FUND | Market Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Market Risk Conditions in a broad or specialized market, a sector thereof or an individual industry or other factors including terrorism, war, natural disasters and the spread of infectious disease including epidemics or pandemics such as the COVID-19 outbreak may adversely affect security prices, thereby reducing the value of the Fund’s investments. To the extent the Fund takes significant positions in one or more specific sectors, countries or regions, the Fund will be subject to the risks associated with such sector(s), country(ies) or region(s) to a greater extent than would be a more broadly diversified fund.
IMPAX GLOBAL SOCIAL LEADERS FUND | Focused Investment Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Focused Investment Risk Focusing investments in a particular market or economic sector (which may include issuers in a number of different industries), including the energy efficiency and water and infrastructure sectors, increases the risk of loss because the stocks of many or all of the companies in the market or sector may decline in value due to economic, market, technological, political or regulatory developments adversely affecting the market or sector.
IMPAX GLOBAL SOCIAL LEADERS FUND | Non-US Securities Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Non-US Securities Risk Non-US securities may have less liquidity and more volatile prices than domestic securities, which can make it difficult for the Fund to sell such securities at desired times or prices. Non-US markets may differ from US markets in material and adverse ways. For example, securities transaction expenses generally are higher, transaction settlement may be slower, recourse in the event of default may be more limited and taxes and currency exchange controls may limit amounts available for distribution to shareholders. Non-US investments are also subject to the effects of local political, social, diplomatic or economic events.
IMPAX GLOBAL SOCIAL LEADERS FUND | Turnover Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Turnover Risk Frequent changes in the securities held by the Fund increases the Fund’s transaction costs and may result in adverse tax consequences, which together may adversely affect the Fund’s performance.
IMPAX GLOBAL SOCIAL LEADERS FUND | Growth Securities Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Securities Risk The values of growth securities may be more sensitive to changes in current or expected earnings than the values of other securities.
IMPAX GLOBAL SOCIAL LEADERS FUND | Small- and Medium-Sized Capitalization Company Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Small- and Medium-Sized Capitalization Company Risk Securities of small- and medium-sized companies may have less liquidity and more volatile prices than securities of larger companies, which can make it difficult for the Fund to sell such securities at desired times or prices.
IMPAX GLOBAL SOCIAL LEADERS FUND | Value Securities Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Securities Risk Value securities are securities the investment adviser believes are selling at a price lower than their true value, perhaps due to adverse business developments or special risks. If that belief is wrong or remains unrecognized by the market, the price of the securities may decline or may not appreciate as anticipated.
IMPAX GLOBAL SOCIAL LEADERS FUND | Emerging Markets Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Emerging Markets Risk Investments in emerging markets are likely to have greater exposure to the risks associated with investments in non-US securities generally. Additionally, emerging market countries generally have less mature economies and less developed securities markets with more limited trading activity, are more heavily dependent on international trade and support, have a higher risk of currency devaluation, and may have more volatile inflation rates or longer periods of high inflation than more developed countries.
IMPAX GLOBAL SOCIAL LEADERS FUND | Currency Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Currency Risk The US dollar value of your investment in the Fund may go down if the value of the local currency of the non-US markets in which the Fund invests depreciates against the US dollar.
IMPAX GLOBAL SOCIAL LEADERS FUND | Management Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Management Risk The Fund is actively managed. The investment techniques and decisions of the investment adviser and the Fund’s portfolio manager(s), including the investment adviser’s assessment of a company’s ESG profile when selecting investments for the Fund, may not produce the desired results and may adversely impact the Fund’s performance, including relative to other funds that do not consider ESG factors or come to different conclusions regarding such factors. Further, in evaluating a company, the Adviser is often dependent upon information and data obtained from the company itself or from third-party data providers that may be incomplete or inaccurate, which could cause the investment adviser or the Fund’s portfolio manager(s) to incorrectly assess a company’s ESG profile.
IMPAX GLOBAL SOCIAL LEADERS FUND | Lack of Operating History Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Lack of Operating History Risk The Fund does not have an operating history and may not achieve significant scale.
IMPAX GLOBAL SOCIAL LEADERS FUND | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock As with all mutual funds, investors may lose money by investing in the Global Social Leaders Fund.
IMPAX GLOBAL SOCIAL LEADERS FUND | Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol IGSIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Redemption Fee rr_RedemptionFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 8.45% [1]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 9.50%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (8.27%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.23%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 125
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 390
IMPAX GLOBAL SOCIAL LEADERS FUND | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol IGSLX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Redemption Fee rr_RedemptionFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 8.45% [1]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 9.25%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (8.27%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.98%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 100
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 312
[1] “Other Expenses” are based on estimated amounts for the first full fiscal year.
[2] The Global Social Leaders Fund’s investment adviser has contractually agreed to reimburse expenses (other than interest, commissions, taxes, extraordinary expenses and Acquired Fund Fees and Expenses, if any) allocable to Institutional Class and Investor Class shares of the Fund to the extent such expenses exceed 0.98% and 1.23% of the average daily net assets of Institutional Class and Investor Class shares, respectively. This reimbursement arrangement may not be amended or terminated without the approval of the Fund’s Board of Trustees before December 31, 2026.