This semi-annual shareholder report contains important information about the Impax Large Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Investor Class	$50	1.00%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 50

Expense Ratio, Percent

1.00%

AssetsNet

$ 365,228,063

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

25.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$365,228,063
Total Number of Portfolio Holdings	39
Portfolio Turnover Rate	25%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	2.3%
Real Estate	1.6%
Utilities	1.9%
Consumer Staples	2.1%
Materials	2.2%
Communication Services	7.3%
Health Care	10.4%
Financials	11.8%
Consumer Discretionary	12.5%
Industrials	14.2%
Information Technology	33.7%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	2.3%
Others^{Footnote Reference†}	32.3%
Biotechnology	2.8%
Trading Companies & Distributors	2.9%
Banks	3.9%
Financial Services	4.2%
Ground Transportation	4.5%
Interactive Media & Services	5.7%
Broadline Retail	6.0%
Life Sciences Tools & Services	6.1%
Software	10.9%
Semiconductors & Semiconductor Equipment	18.4%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^†	Includes additional industries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	93.4%
Foreign Stocks	4.0%
Cash & Cash Equivalents	2.6%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
NVIDIA Corp.	10.3%
Microsoft Corp.	6.7%
Amazon.com, Inc.	6.1%
Alphabet, Inc., A	5.7%
Broadcom, Inc.	4.9%
Mastercard, Inc., A	4.2%
Gilead Sciences, Inc.	2.8%
Uber Technologies, Inc.	2.7%
Agilent Technologies, Inc.	2.6%
Waste Connections, Inc.	2.5%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000175860

Shareholder Report [Line Items]

Fund Name

Impax Large Cap Fund

Class Name

Institutional Class

Trading Symbol

PXLIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Large Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Institutional Class	$37	0.75%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 37

Expense Ratio, Percent

0.75%

AssetsNet

$ 365,228,063

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

25.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$365,228,063
Total Number of Portfolio Holdings	39
Portfolio Turnover Rate	25%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	2.3%
Real Estate	1.6%
Utilities	1.9%
Consumer Staples	2.1%
Materials	2.2%
Communication Services	7.3%
Health Care	10.4%
Financials	11.8%
Consumer Discretionary	12.5%
Industrials	14.2%
Information Technology	33.7%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	2.3%
Others^{Footnote Reference†}	32.3%
Biotechnology	2.8%
Trading Companies & Distributors	2.9%
Banks	3.9%
Financial Services	4.2%
Ground Transportation	4.5%
Interactive Media & Services	5.7%
Broadline Retail	6.0%
Life Sciences Tools & Services	6.1%
Software	10.9%
Semiconductors & Semiconductor Equipment	18.4%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^†	Includes additional industries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	93.4%
Foreign Stocks	4.0%
Cash & Cash Equivalents	2.6%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
NVIDIA Corp.	10.3%
Microsoft Corp.	6.7%
Amazon.com, Inc.	6.1%
Alphabet, Inc., A	5.7%
Broadcom, Inc.	4.9%
Mastercard, Inc., A	4.2%
Gilead Sciences, Inc.	2.8%
Uber Technologies, Inc.	2.7%
Agilent Technologies, Inc.	2.6%
Waste Connections, Inc.	2.5%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000061360

Shareholder Report [Line Items]

Fund Name

Impax Small Cap Fund

Class Name

Investor Class

Trading Symbol

PXSCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Small Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Investor Class	$63	1.14%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 63

Expense Ratio, Percent

1.14%

AssetsNet

$ 949,240,211

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$949,240,211
Total Number of Portfolio Holdings	61
Portfolio Turnover Rate	27%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.8%
Communication Services	0.5%
Materials	1.9%
Real Estate	3.7%
Consumer Staples	4.7%
Consumer Discretionary	9.3%
Financials	17.7%
Industrials	18.3%
Information Technology	18.9%
Health Care	23.2%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.9%
Others^{Footnote Reference†}	34.9%
Hotels, Restaurants & Leisure	4.1%
Machinery	4.4%
Construction & Engineering	4.9%
Communications Equipment	5.0%
Health Care Equipment & Supplies	5.6%
Biotechnology	7.2%
Capital Markets	7.3%
Pharmaceuticals	8.0%
Software	8.2%
Banks	8.5%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^†	Includes additional industries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	96.3%
Cash & Cash Equivalents	3.0%
Foreign Stocks	0.7%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
Victory Capital Holdings, Inc., A	4.7%
Ligand Pharmaceuticals, Inc.	4.3%
Pinnacle Financial Partners, Inc.	3.0%
Eastern Bankshares, Inc.	3.0%
Mitek Systems, Inc.	2.9%
Neurocrine Biosciences, Inc.	2.8%
Acadian Asset Management, Inc.	2.6%
Teradata Corp.	2.5%
SI-BONE, Inc.	2.5%
Onto Innovation, Inc.	2.3%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000128850

Shareholder Report [Line Items]

Fund Name

Impax Small Cap Fund

Class Name

Class A

Trading Symbol

PXSAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Small Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Class A	$63	1.14%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 63

Expense Ratio, Percent

1.14%

AssetsNet

$ 949,240,211

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$949,240,211
Total Number of Portfolio Holdings	61
Portfolio Turnover Rate	27%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.8%
Communication Services	0.5%
Materials	1.9%
Real Estate	3.7%
Consumer Staples	4.7%
Consumer Discretionary	9.3%
Financials	17.7%
Industrials	18.3%
Information Technology	18.9%
Health Care	23.2%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.9%
Others^{Footnote Reference†}	34.9%
Hotels, Restaurants & Leisure	4.1%
Machinery	4.4%
Construction & Engineering	4.9%
Communications Equipment	5.0%
Health Care Equipment & Supplies	5.6%
Biotechnology	7.2%
Capital Markets	7.3%
Pharmaceuticals	8.0%
Software	8.2%
Banks	8.5%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^†	Includes additional industries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	96.3%
Cash & Cash Equivalents	3.0%
Foreign Stocks	0.7%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
Victory Capital Holdings, Inc., A	4.7%
Ligand Pharmaceuticals, Inc.	4.3%
Pinnacle Financial Partners, Inc.	3.0%
Eastern Bankshares, Inc.	3.0%
Mitek Systems, Inc.	2.9%
Neurocrine Biosciences, Inc.	2.8%
Acadian Asset Management, Inc.	2.6%
Teradata Corp.	2.5%
SI-BONE, Inc.	2.5%
Onto Innovation, Inc.	2.3%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000061361

Shareholder Report [Line Items]

Fund Name

Impax Small Cap Fund

Class Name

Institutional Class

Trading Symbol

PXSIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Small Cap Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Institutional Class	$50	0.90%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 50

Expense Ratio, Percent

0.90%

AssetsNet

$ 949,240,211

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$949,240,211
Total Number of Portfolio Holdings	61
Portfolio Turnover Rate	27%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.8%
Communication Services	0.5%
Materials	1.9%
Real Estate	3.7%
Consumer Staples	4.7%
Consumer Discretionary	9.3%
Financials	17.7%
Industrials	18.3%
Information Technology	18.9%
Health Care	23.2%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.9%
Others^{Footnote Reference†}	34.9%
Hotels, Restaurants & Leisure	4.1%
Machinery	4.4%
Construction & Engineering	4.9%
Communications Equipment	5.0%
Health Care Equipment & Supplies	5.6%
Biotechnology	7.2%
Capital Markets	7.3%
Pharmaceuticals	8.0%
Software	8.2%
Banks	8.5%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^†	Includes additional industries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	96.3%
Cash & Cash Equivalents	3.0%
Foreign Stocks	0.7%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
Victory Capital Holdings, Inc., A	4.7%
Ligand Pharmaceuticals, Inc.	4.3%
Pinnacle Financial Partners, Inc.	3.0%
Eastern Bankshares, Inc.	3.0%
Mitek Systems, Inc.	2.9%
Neurocrine Biosciences, Inc.	2.8%
Acadian Asset Management, Inc.	2.6%
Teradata Corp.	2.5%
SI-BONE, Inc.	2.5%
Onto Innovation, Inc.	2.3%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000043241

Shareholder Report [Line Items]

Fund Name

Impax US Sustainable Economy Fund

Class Name

Investor Class

Trading Symbol

PXWGX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax US Sustainable Economy Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Investor Class	$38	0.72%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 38

Expense Ratio, Percent

0.72%

AssetsNet

$ 1,086,888,041

Holdings Count | Holding

132

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$1,086,888,041
Total Number of Portfolio Holdings	132
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	0.9%
Consumer Staples	0.7%
Real Estate	3.0%
Materials	3.4%
Utilities	3.9%
Consumer Discretionary	5.5%
Communication Services	5.6%
Industrials	6.3%
Health Care	13.9%
Financials	15.6%
Information Technology	41.2%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	0.9%
Others^{Footnote Reference†}	31.3%
Chemicals	3.1%
Banks	3.2%
Insurance	3.6%
Financial Services	4.0%
Interactive Media & Services	4.1%
Capital Markets	4.4%
Pharmaceuticals	5.6%
Software	6.9%
Technology Hardware, Storage & Peripherals	7.0%
Semiconductors & Semiconductor Equipment	25.9%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^†	Includes additional industries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	99.1%
Cash & Cash Equivalents	0.8%
Foreign Stocks	0.1%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
NVIDIA Corp.	8.2%
Apple, Inc.	6.2%
Microsoft Corp.	3.4%
Micron Technology, Inc.	2.7%
Broadcom, Inc.	2.4%
Applied Materials, Inc.	2.4%
Alphabet, Inc., A	2.3%
Advanced Micro Devices, Inc.	2.2%
Johnson & Johnson	2.2%
KLA Corp.	2.1%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

Material Fund Change [Text Block]

Material Fund Changes

Management contractually agreed to waive a portion of its management fee. This fee waiver was terminated with the approval of the Fund's Board of Trustees on May 1, 2026.

C000128848

Shareholder Report [Line Items]

Fund Name

Impax US Sustainable Economy Fund

Class Name

Class A

Trading Symbol

PXGAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax US Sustainable Economy Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Class A	$38	0.72%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 38

Expense Ratio, Percent

0.72%

AssetsNet

$ 1,086,888,041

Holdings Count | Holding

132

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$1,086,888,041
Total Number of Portfolio Holdings	132
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	0.9%
Consumer Staples	0.7%
Real Estate	3.0%
Materials	3.4%
Utilities	3.9%
Consumer Discretionary	5.5%
Communication Services	5.6%
Industrials	6.3%
Health Care	13.9%
Financials	15.6%
Information Technology	41.2%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	0.9%
Others^{Footnote Reference†}	31.3%
Chemicals	3.1%
Banks	3.2%
Insurance	3.6%
Financial Services	4.0%
Interactive Media & Services	4.1%
Capital Markets	4.4%
Pharmaceuticals	5.6%
Software	6.9%
Technology Hardware, Storage & Peripherals	7.0%
Semiconductors & Semiconductor Equipment	25.9%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^†	Includes additional industries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	99.1%
Cash & Cash Equivalents	0.8%
Foreign Stocks	0.1%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
NVIDIA Corp.	8.2%
Apple, Inc.	6.2%
Microsoft Corp.	3.4%
Micron Technology, Inc.	2.7%
Broadcom, Inc.	2.4%
Applied Materials, Inc.	2.4%
Alphabet, Inc., A	2.3%
Advanced Micro Devices, Inc.	2.2%
Johnson & Johnson	2.2%
KLA Corp.	2.1%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

Material Fund Change [Text Block]

Material Fund Changes

Management contractually agreed to waive a portion of its management fee. This fee waiver was terminated with the approval of the Fund's Board of Trustees on May 1, 2026.

C000043242

Shareholder Report [Line Items]

Fund Name

Impax US Sustainable Economy Fund

Class Name

Institutional Class

Trading Symbol

PWGIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax US Sustainable Economy Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Institutional Class	$25	0.48%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.48%

AssetsNet

$ 1,086,888,041

Holdings Count | Holding

132

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$1,086,888,041
Total Number of Portfolio Holdings	132
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	0.9%
Consumer Staples	0.7%
Real Estate	3.0%
Materials	3.4%
Utilities	3.9%
Consumer Discretionary	5.5%
Communication Services	5.6%
Industrials	6.3%
Health Care	13.9%
Financials	15.6%
Information Technology	41.2%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	0.9%
Others^{Footnote Reference†}	31.3%
Chemicals	3.1%
Banks	3.2%
Insurance	3.6%
Financial Services	4.0%
Interactive Media & Services	4.1%
Capital Markets	4.4%
Pharmaceuticals	5.6%
Software	6.9%
Technology Hardware, Storage & Peripherals	7.0%
Semiconductors & Semiconductor Equipment	25.9%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^†	Includes additional industries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	99.1%
Cash & Cash Equivalents	0.8%
Foreign Stocks	0.1%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
NVIDIA Corp.	8.2%
Apple, Inc.	6.2%
Microsoft Corp.	3.4%
Micron Technology, Inc.	2.7%
Broadcom, Inc.	2.4%
Applied Materials, Inc.	2.4%
Alphabet, Inc., A	2.3%
Advanced Micro Devices, Inc.	2.2%
Johnson & Johnson	2.2%
KLA Corp.	2.1%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

Material Fund Change [Text Block]

Material Fund Changes

Management contractually agreed to waive a portion of its management fee. This fee waiver was terminated with the approval of the Fund's Board of Trustees on May 1, 2026.

C000268069

Shareholder Report [Line Items]

Fund Name

Impax Global Sustainable Infrastructure ETF

No Trading Symbol [Flag]

true

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Global Sustainable Infrastructure ETF (the "Fund") (formerly, Impax Global Infrastructure ETF) for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses Paid, Amount

$ 32

Expense Ratio, Percent

0.61%

AssetsNet

$ 118,496,198

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

29.00%

C000201508

Shareholder Report [Line Items]

Fund Name

Impax Global Opportunities Fund

Class Name

Investor Class

Trading Symbol

PAXGX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Global Opportunities Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Investor Class	$65	1.27%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 65

Expense Ratio, Percent

1.27%

AssetsNet

$ 96,534,292

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

30.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$96,534,292
Total Number of Portfolio Holdings	43
Portfolio Turnover Rate	30%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	2.1%
Communication Services	1.3%
Utilities	2.1%
Materials	3.2%
Consumer Staples	3.5%
Consumer Discretionary	6.4%
Health Care	9.8%
Industrials	15.5%
Financials	21.2%
Information Technology	34.9%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	2.1%
Others^{Footnote Reference‡}	4.4%
United Kingdom	1.7%
France	2.1%
Spain	2.2%
Bermuda	2.4%
Switzerland	3.6%
Germany	4.1%
Taiwan	4.4%
Netherlands	4.8%
Japan	5.9%
United States	62.3%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^‡	Includes additional countries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	62.4%
Foreign Stocks	35.8%
Cash & Cash Equivalents	1.8%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
NVIDIA Corp.	6.8%
Microsoft Corp.	4.9%
Taiwan Semiconductor Manufacturing Co. Ltd.	4.4%
Mastercard, Inc., A	4.1%
Applied Materials, Inc.	4.0%
Keyence Corp.	3.2%
Linde plc	3.2%
Schneider Electric SE	3.2%
Citizens Financial Group, Inc.	2.6%
Pinnacle Financial Partners, Inc.	2.5%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

Material Fund Change [Text Block]

Material Fund Changes

The Adviser had contractually agreed to reimburse expenses (other than interest, commissions, taxes, extraordinary expenses and acquired fund fees and expenses, if any) to the extent that they exceeded the expense caps indicated. The reimbursement arrangement was terminated with the approval of the Fund's Board of Trustees on May 1, 2026.

Prior to May 1, 2026, the management fee was 0.80% for all assets.

C000201507

Shareholder Report [Line Items]

Fund Name

Impax Global Opportunities Fund

Class Name

Institutional Class

Trading Symbol

PXGOX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Global Opportunities Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Institutional Class	$52	1.02%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

1.02%

AssetsNet

$ 96,534,292

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

30.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$96,534,292
Total Number of Portfolio Holdings	43
Portfolio Turnover Rate	30%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	2.1%
Communication Services	1.3%
Utilities	2.1%
Materials	3.2%
Consumer Staples	3.5%
Consumer Discretionary	6.4%
Health Care	9.8%
Industrials	15.5%
Financials	21.2%
Information Technology	34.9%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	2.1%
Others^{Footnote Reference‡}	4.4%
United Kingdom	1.7%
France	2.1%
Spain	2.2%
Bermuda	2.4%
Switzerland	3.6%
Germany	4.1%
Taiwan	4.4%
Netherlands	4.8%
Japan	5.9%
United States	62.3%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^‡	Includes additional countries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	62.4%
Foreign Stocks	35.8%
Cash & Cash Equivalents	1.8%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
NVIDIA Corp.	6.8%
Microsoft Corp.	4.9%
Taiwan Semiconductor Manufacturing Co. Ltd.	4.4%
Mastercard, Inc., A	4.1%
Applied Materials, Inc.	4.0%
Keyence Corp.	3.2%
Linde plc	3.2%
Schneider Electric SE	3.2%
Citizens Financial Group, Inc.	2.6%
Pinnacle Financial Partners, Inc.	2.5%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

Material Fund Change [Text Block]

Material Fund Changes

Prior to May 1, 2026, the management fee was 0.80% for all assets.

C000061357

Shareholder Report [Line Items]

Fund Name

Impax Global Environmental Markets Fund

Class Name

Investor Class

Trading Symbol

PGRNX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Global Environmental Markets Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Investor Class	$66	1.20%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 66

Expense Ratio, Percent

1.20%

AssetsNet

$ 1,754,264,476

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

46.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$1,754,264,476
Total Number of Portfolio Holdings	43
Portfolio Turnover Rate	46%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.5%
Alternative Energy	1.6%
Sustainable Food & Agriculture	4.6%
Environmental Services & Resources	6.8%
Transport Solutions	8.5%
Resource Efficiency & Waste Management	9.2%
Water Infrastructure & Technologies	12.4%
Energy Management & Efficiency	24.9%
Digital Infrastructure	30.5%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.5%
Others^{Footnote Reference‡}	6.7%
Bermuda	1.9%
South Korea	2.5%
Ireland	2.6%
Switzerland	2.6%
Netherlands	3.6%
Germany	3.7%
Taiwan	3.9%
Japan	3.9%
France	6.2%
United States	60.9%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^‡	Includes additional countries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	60.8%
Foreign Stocks	37.7%
Cash & Cash Equivalents	1.5%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
NVIDIA Corp.	5.6%
KLA Corp.	4.8%
Microsoft Corp.	4.3%
Waste Connections, Inc.	4.3%
Taiwan Semiconductor Manufacturing Co. Ltd.	3.9%
Amphenol Corp., A	3.9%
ASML Holding NV	3.6%
Linde plc	3.5%
Schneider Electric SE	3.2%
Veolia Environnement SA	3.1%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000128849

Shareholder Report [Line Items]

Fund Name

Impax Global Environmental Markets Fund

Class Name

Class A

Trading Symbol

PXEAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Global Environmental Markets Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Class A	$66	1.20%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 66

Expense Ratio, Percent

1.20%

AssetsNet

$ 1,754,264,476

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

46.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$1,754,264,476
Total Number of Portfolio Holdings	43
Portfolio Turnover Rate	46%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.5%
Alternative Energy	1.6%
Sustainable Food & Agriculture	4.6%
Environmental Services & Resources	6.8%
Transport Solutions	8.5%
Resource Efficiency & Waste Management	9.2%
Water Infrastructure & Technologies	12.4%
Energy Management & Efficiency	24.9%
Digital Infrastructure	30.5%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.5%
Others^{Footnote Reference‡}	6.7%
Bermuda	1.9%
South Korea	2.5%
Ireland	2.6%
Switzerland	2.6%
Netherlands	3.6%
Germany	3.7%
Taiwan	3.9%
Japan	3.9%
France	6.2%
United States	60.9%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^‡	Includes additional countries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	60.8%
Foreign Stocks	37.7%
Cash & Cash Equivalents	1.5%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
NVIDIA Corp.	5.6%
KLA Corp.	4.8%
Microsoft Corp.	4.3%
Waste Connections, Inc.	4.3%
Taiwan Semiconductor Manufacturing Co. Ltd.	3.9%
Amphenol Corp., A	3.9%
ASML Holding NV	3.6%
Linde plc	3.5%
Schneider Electric SE	3.2%
Veolia Environnement SA	3.1%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000061358

Shareholder Report [Line Items]

Fund Name

Impax Global Environmental Markets Fund

Class Name

Institutional Class

Trading Symbol

PGINX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Global Environmental Markets Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Institutional Class	$52	0.95%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

0.95%

AssetsNet

$ 1,754,264,476

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

46.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$1,754,264,476
Total Number of Portfolio Holdings	43
Portfolio Turnover Rate	46%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.5%
Alternative Energy	1.6%
Sustainable Food & Agriculture	4.6%
Environmental Services & Resources	6.8%
Transport Solutions	8.5%
Resource Efficiency & Waste Management	9.2%
Water Infrastructure & Technologies	12.4%
Energy Management & Efficiency	24.9%
Digital Infrastructure	30.5%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.5%
Others^{Footnote Reference‡}	6.7%
Bermuda	1.9%
South Korea	2.5%
Ireland	2.6%
Switzerland	2.6%
Netherlands	3.6%
Germany	3.7%
Taiwan	3.9%
Japan	3.9%
France	6.2%
United States	60.9%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^‡	Includes additional countries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Stocks	60.8%
Foreign Stocks	37.7%
Cash & Cash Equivalents	1.5%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
NVIDIA Corp.	5.6%
KLA Corp.	4.8%
Microsoft Corp.	4.3%
Waste Connections, Inc.	4.3%
Taiwan Semiconductor Manufacturing Co. Ltd.	3.9%
Amphenol Corp., A	3.9%
ASML Holding NV	3.6%
Linde plc	3.5%
Schneider Electric SE	3.2%
Veolia Environnement SA	3.1%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000137562

Shareholder Report [Line Items]

Fund Name

Impax International Sustainable Economy Fund

Class Name

Investor Class

Trading Symbol

PXINX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax International Sustainable Economy Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Investor Class	$36	0.68%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 36

Expense Ratio, Percent

0.68%

AssetsNet

$ 1,869,734,983

Holdings Count | Holding

138

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$1,869,734,983
Total Number of Portfolio Holdings	138
Portfolio Turnover Rate	19%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.7%
Real Estate	1.4%
Materials	2.4%
Communication Services	4.4%
Consumer Discretionary	5.0%
Consumer Staples	5.9%
Utilities	8.6%
Health Care	10.5%
Information Technology	15.4%
Industrials	16.7%
Financials	28.0%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.7%
Others^{Footnote Reference‡}	10.8%
Spain	4.0%
Switzerland	4.6%
Italy	5.6%
Netherlands	6.2%
Australia	6.4%
United States	6.7%
France	8.1%
Germany	8.7%
United Kingdom	13.8%
Japan	23.4%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^‡	Includes additional countries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Foreign Stocks	92.4%
U.S. Stocks	6.7%
Cash & Cash Equivalents	0.9%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
ASML Holding NV	4.2%
HSBC Holdings plc	2.6%
Novartis AG	2.4%
Siemens AG	2.2%
ABB Ltd.	2.0%
Tokyo Electron Ltd.	1.9%
Schneider Electric SE	1.9%
Iberdrola SA	1.9%
Sony Group Corp.	1.8%
Infineon Technologies AG	1.7%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000137561

Shareholder Report [Line Items]

Fund Name

Impax International Sustainable Economy Fund

Class Name

Institutional Class

Trading Symbol

PXNIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax International Sustainable Economy Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Institutional Class	$23	0.43%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 23

Expense Ratio, Percent

0.43%

AssetsNet

$ 1,869,734,983

Holdings Count | Holding

138

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$1,869,734,983
Total Number of Portfolio Holdings	138
Portfolio Turnover Rate	19%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.7%
Real Estate	1.4%
Materials	2.4%
Communication Services	4.4%
Consumer Discretionary	5.0%
Consumer Staples	5.9%
Utilities	8.6%
Health Care	10.5%
Information Technology	15.4%
Industrials	16.7%
Financials	28.0%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.7%
Others^{Footnote Reference‡}	10.8%
Spain	4.0%
Switzerland	4.6%
Italy	5.6%
Netherlands	6.2%
Australia	6.4%
United States	6.7%
France	8.1%
Germany	8.7%
United Kingdom	13.8%
Japan	23.4%

Footnote	Description
Footnote^{^}	Percent of Net Assets.
Footnote^‡	Includes additional countries outside the top 10 listed above.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Foreign Stocks	92.4%
U.S. Stocks	6.7%
Cash & Cash Equivalents	0.9%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
ASML Holding NV	4.2%
HSBC Holdings plc	2.6%
Novartis AG	2.4%
Siemens AG	2.2%
ABB Ltd.	2.0%
Tokyo Electron Ltd.	1.9%
Schneider Electric SE	1.9%
Iberdrola SA	1.9%
Sony Group Corp.	1.8%
Infineon Technologies AG	1.7%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000175863

Shareholder Report [Line Items]

Fund Name

Impax Core Bond Fund

Class Name

Investor Class

Trading Symbol

PAXBX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Core Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Investor Class	$36	0.72%

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 36

Expense Ratio, Percent

0.72%

AssetsNet

$ 889,672,149

Holdings Count | Holding

398

InvestmentCompanyPortfolioTurnover

64.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$889,672,149
Total Number of Portfolio Holdings	398
Portfolio Turnover Rate	64%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.4%
Municipal Bonds	0.7%
Foreign Government and Agency Securities	1.7%
Asset-Backed Securities	5.4%
Supranational	5.5%
U.S. Government and Agency Securities	25.8%
Mortgage-Backed Securities	29.7%
Corporate Bonds	29.8%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Credit Quality Allocation as of June 30, 2026^{Footnote Reference ^}^{Footnote Reference*}

Table Summary
U.S. Government	26.6%
AAA	8.0%
AA	5.0%
A	11.4%
BBB	14.0%
BB or lower	2.7%
N/R (Not Rated)	32.3%

Footnote	Description
Footnote^{^}	Percent of Net Bonds.
Footnote^*	The credit quality ratings shown above are assigned by S&P Global Ratings. S&P Global Ratings is a nationally recognized statistical rating organization. Investment grade ratings are credit ratings of BB or higher. Below investment grade are credit ratings of BB or lower. Investments designated N/R are not rated by S&P Global Ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Bonds	89.9%
Supranational	5.6%
Foreign Bonds	3.6%
Cash & Cash Equivalents	0.9%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
U.S. Treasury Notes, 3.875%, 5/15/29	6.1%
U.S. Treasury Notes, 3.500%, 1/31/28	6.0%
U.S. Treasury Bonds, 5.000%, 5/15/46	4.6%
U.S. Treasury Notes, 4.125%, 5/31/31	3.5%
U.S. Treasury Bonds, 4.750%, 2/15/56	3.1%
AT&T, Inc., 5.250%, 10/30/36	1.2%
U.S. Treasury Bonds, 1.875%, 11/15/51	1.1%
Bank of America Corp., 5.872%, 9/15/34	0.7%
International Bank for Reconstruction & Development, 4.625%, 1/15/32	0.6%
Morgan Stanley, 5.424%, 7/21/34	0.6%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000175862

Shareholder Report [Line Items]

Fund Name

Impax Core Bond Fund

Class Name

Institutional Class

Trading Symbol

PXBIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Core Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Institutional Class	$24	0.47%

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 24

Expense Ratio, Percent

0.47%

AssetsNet

$ 889,672,149

Holdings Count | Holding

398

InvestmentCompanyPortfolioTurnover

64.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$889,672,149
Total Number of Portfolio Holdings	398
Portfolio Turnover Rate	64%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	1.4%
Municipal Bonds	0.7%
Foreign Government and Agency Securities	1.7%
Asset-Backed Securities	5.4%
Supranational	5.5%
U.S. Government and Agency Securities	25.8%
Mortgage-Backed Securities	29.7%
Corporate Bonds	29.8%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.

Credit Quality Allocation as of June 30, 2026^{Footnote Reference ^}^{Footnote Reference*}

Table Summary
U.S. Government	26.6%
AAA	8.0%
AA	5.0%
A	11.4%
BBB	14.0%
BB or lower	2.7%
N/R (Not Rated)	32.3%

Footnote	Description
Footnote^{^}	Percent of Net Bonds.
Footnote^*	The credit quality ratings shown above are assigned by S&P Global Ratings. S&P Global Ratings is a nationally recognized statistical rating organization. Investment grade ratings are credit ratings of BB or higher. Below investment grade are credit ratings of BB or lower. Investments designated N/R are not rated by S&P Global Ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Bonds	89.9%
Supranational	5.6%
Foreign Bonds	3.6%
Cash & Cash Equivalents	0.9%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
U.S. Treasury Notes, 3.875%, 5/15/29	6.1%
U.S. Treasury Notes, 3.500%, 1/31/28	6.0%
U.S. Treasury Bonds, 5.000%, 5/15/46	4.6%
U.S. Treasury Notes, 4.125%, 5/31/31	3.5%
U.S. Treasury Bonds, 4.750%, 2/15/56	3.1%
AT&T, Inc., 5.250%, 10/30/36	1.2%
U.S. Treasury Bonds, 1.875%, 11/15/51	1.1%
Bank of America Corp., 5.872%, 9/15/34	0.7%
International Bank for Reconstruction & Development, 4.625%, 1/15/32	0.6%
Morgan Stanley, 5.424%, 7/21/34	0.6%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000043226

Shareholder Report [Line Items]

Fund Name

Impax High Yield Bond Fund

Class Name

Investor Class

Trading Symbol

PAXHX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax High Yield Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Investor Class	$47	0.93%

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 47

Expense Ratio, Percent

0.93%

AssetsNet

$ 533,611,186

Holdings Count | Holding

242

InvestmentCompanyPortfolioTurnover

44.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$533,611,186
Total Number of Portfolio Holdings	242
Portfolio Turnover Rate	44%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	4.2%
Others^{Footnote Reference†}	20.9%
Technology & Electronics	4.5%
Consumer Goods	5.0%
Retail	5.9%
Services	6.0%
Healthcare	6.6%
Basic Industry	7.0%
Capital Goods	7.4%
Financial Services	8.8%
Telecommunications	11.3%
Media	12.4%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.
Footnote^†	Includes additional sectors outside the top 10 listed above.

Credit Quality Allocation as of June 30, 2026^{Footnote Reference ^}^{Footnote Reference*}

Table Summary
BBB	3.7%
BB or lower	84.5%
N/R (Not Rated)	11.8%

Footnote	Description
Footnote^{^}	Percent of Net Bonds.
Footnote^*	The credit quality ratings shown above are assigned by S&P Global Ratings. S&P Global Ratings is a nationally recognized statistical rating organization. Investment grade ratings are credit ratings of BB or higher. Below investment grade are credit ratings of BB or lower. Investments designated N/R are not rated by S&P Global Ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Bonds	77.5%
Foreign Bonds	15.8%
Cash & Cash Equivalents	4.1%
Loans	2.5%
Foreign Stocks	0.1%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
Liberty Mutual Group, Inc., 4.125%, 12/15/51	1.1%
CCO Holdings LLC / CCO Holdings Capital Corp., 4.750%, 3/01/30	1.0%
Hilton Domestic Operating Co., Inc., 6.125%, 4/01/32	0.9%
Rocket Cos., Inc., 6.375%, 8/01/33	0.9%
Cogent Communications Group LLC / Cogent Finance, Inc., 7.000%, 6/15/27	0.8%
CVR Partners LP / CVR Nitrogen Finance Corp., 6.125%, 6/15/28	0.8%
Digicel International Finance Ltd. / DIFL US LLC, 8.625%, 8/01/32	0.8%
Humana, Inc., 6.625%, 9/15/56	0.7%
Gray Media, Inc., 9.625%, 7/15/32	0.7%
ATS Corp., 4.125%, 12/15/28	0.7%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000128847

Shareholder Report [Line Items]

Fund Name

Impax High Yield Bond Fund

Class Name

Class A

Trading Symbol

PXHAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax High Yield Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Class A	$47	0.93%

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 47

Expense Ratio, Percent

0.93%

AssetsNet

$ 533,611,186

Holdings Count | Holding

242

InvestmentCompanyPortfolioTurnover

44.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$533,611,186
Total Number of Portfolio Holdings	242
Portfolio Turnover Rate	44%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	4.2%
Others^{Footnote Reference†}	20.9%
Technology & Electronics	4.5%
Consumer Goods	5.0%
Retail	5.9%
Services	6.0%
Healthcare	6.6%
Basic Industry	7.0%
Capital Goods	7.4%
Financial Services	8.8%
Telecommunications	11.3%
Media	12.4%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.
Footnote^†	Includes additional sectors outside the top 10 listed above.

Credit Quality Allocation as of June 30, 2026^{Footnote Reference ^}^{Footnote Reference*}

Table Summary
BBB	3.7%
BB or lower	84.5%
N/R (Not Rated)	11.8%

Footnote	Description
Footnote^{^}	Percent of Net Bonds.
Footnote^*	The credit quality ratings shown above are assigned by S&P Global Ratings. S&P Global Ratings is a nationally recognized statistical rating organization. Investment grade ratings are credit ratings of BB or higher. Below investment grade are credit ratings of BB or lower. Investments designated N/R are not rated by S&P Global Ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Bonds	77.5%
Foreign Bonds	15.8%
Cash & Cash Equivalents	4.1%
Loans	2.5%
Foreign Stocks	0.1%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
Liberty Mutual Group, Inc., 4.125%, 12/15/51	1.1%
CCO Holdings LLC / CCO Holdings Capital Corp., 4.750%, 3/01/30	1.0%
Hilton Domestic Operating Co., Inc., 6.125%, 4/01/32	0.9%
Rocket Cos., Inc., 6.375%, 8/01/33	0.9%
Cogent Communications Group LLC / Cogent Finance, Inc., 7.000%, 6/15/27	0.8%
CVR Partners LP / CVR Nitrogen Finance Corp., 6.125%, 6/15/28	0.8%
Digicel International Finance Ltd. / DIFL US LLC, 8.625%, 8/01/32	0.8%
Humana, Inc., 6.625%, 9/15/56	0.7%
Gray Media, Inc., 9.625%, 7/15/32	0.7%
ATS Corp., 4.125%, 12/15/28	0.7%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000043227

Shareholder Report [Line Items]

Fund Name

Impax High Yield Bond Fund

Class Name

Institutional Class

Trading Symbol

PXHIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax High Yield Bond Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Institutional Class	$34	0.68%

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 34

Expense Ratio, Percent

0.68%

AssetsNet

$ 533,611,186

Holdings Count | Holding

242

InvestmentCompanyPortfolioTurnover

44.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$533,611,186
Total Number of Portfolio Holdings	242
Portfolio Turnover Rate	44%

Holdings [Text Block]

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Table Summary
Value	Value
Other assets and liabilities (net)	4.2%
Others^{Footnote Reference†}	20.9%
Technology & Electronics	4.5%
Consumer Goods	5.0%
Retail	5.9%
Services	6.0%
Healthcare	6.6%
Basic Industry	7.0%
Capital Goods	7.4%
Financial Services	8.8%
Telecommunications	11.3%
Media	12.4%

Footnote	Description
Footnote^*	May include companies representing multiple industries within a single “Sector”.
Footnote^{^}	Percent of Net Assets.
Footnote^†	Includes additional sectors outside the top 10 listed above.

Credit Quality Allocation as of June 30, 2026^{Footnote Reference ^}^{Footnote Reference*}

Table Summary
BBB	3.7%
BB or lower	84.5%
N/R (Not Rated)	11.8%

Footnote	Description
Footnote^{^}	Percent of Net Bonds.
Footnote^*	The credit quality ratings shown above are assigned by S&P Global Ratings. S&P Global Ratings is a nationally recognized statistical rating organization. Investment grade ratings are credit ratings of BB or higher. Below investment grade are credit ratings of BB or lower. Investments designated N/R are not rated by S&P Global Ratings. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
U.S. Bonds	77.5%
Foreign Bonds	15.8%
Cash & Cash Equivalents	4.1%
Loans	2.5%
Foreign Stocks	0.1%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Table Summary
Company	Percent of Net Assets
Liberty Mutual Group, Inc., 4.125%, 12/15/51	1.1%
CCO Holdings LLC / CCO Holdings Capital Corp., 4.750%, 3/01/30	1.0%
Hilton Domestic Operating Co., Inc., 6.125%, 4/01/32	0.9%
Rocket Cos., Inc., 6.375%, 8/01/33	0.9%
Cogent Communications Group LLC / Cogent Finance, Inc., 7.000%, 6/15/27	0.8%
CVR Partners LP / CVR Nitrogen Finance Corp., 6.125%, 6/15/28	0.8%
Digicel International Finance Ltd. / DIFL US LLC, 8.625%, 8/01/32	0.8%
Humana, Inc., 6.625%, 9/15/56	0.7%
Gray Media, Inc., 9.625%, 7/15/32	0.7%
ATS Corp., 4.125%, 12/15/28	0.7%

Footnote	Description
Footnote^*	Ten largest holdings do not include money market securities, certificates of deposit, commercial paper or cash and equivalents, if applicable. Holdings are subject to change.

C000043250

Shareholder Report [Line Items]

Fund Name

Impax Sustainable Allocation Fund

Class Name

Investor Class

Trading Symbol

PAXWX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Sustainable Allocation Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Investor Class	$15	0.30%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 15

Expense Ratio, Percent

0.30%

AssetsNet

$ 2,395,788,075

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$2,395,788,075
Total Number of Portfolio Holdings	10
Portfolio Turnover Rate	22%

Holdings [Text Block]

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Affiliated Investment Companies	96.1%
Cash & Cash Equivalents	3.9%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Affiliated Investment Companies as of June 30, 2026

Table Summary
	Percent of Net Assets
Impax Core Bond Fund	32.4%
Impax US Sustainable Economy Fund	26.0%
Impax Large Cap Fund	10.3%
Impax International Sustainable Economy Fund	8.8%
Impax Small Cap Fund	6.2%
Impax High Yield Bond Fund	5.1%
Impax Global Sustainable Infrastructure ETF	3.0%
Impax Global Environmental Markets Fund	2.3%
Impax Global Opportunities Fund	2.1%

Material Fund Change [Text Block]

C000043251

Shareholder Report [Line Items]

Fund Name

Impax Sustainable Allocation Fund

Class Name

Institutional Class

Trading Symbol

PAXIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Impax Sustainable Allocation Fund (the "Fund") for the period of January 1, 2026 to June 30, 2026.

Shareholder Report Annual or Semi-Annual

Semi-annual Shareholder Report

Additional Information [Text Block]

You can also request this information by contacting us at (800) 372-7827.

Additional Information Phone Number

(800) 372-7827

Expenses [Text Block]

What were the Fund's costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment^{Footnote Reference*}
Institutional Class	$3	0.05%

Footnote	Description
Footnote*	Annualized.

Expenses Paid, Amount

$ 3

Expense Ratio, Percent

0.05%

AssetsNet

$ 2,395,788,075

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics as of June 30, 2026

Table Summary
Net Assets	$2,395,788,075
Total Number of Portfolio Holdings	10
Portfolio Turnover Rate	22%

Holdings [Text Block]

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Table Summary
Value	Value
Affiliated Investment Companies	96.1%
Cash & Cash Equivalents	3.9%

Footnote	Description
Footnote^{^}	Percent of Total Investments.

Largest Holdings [Text Block]

Affiliated Investment Companies as of June 30, 2026

Table Summary
	Percent of Net Assets
Impax Core Bond Fund	32.4%
Impax US Sustainable Economy Fund	26.0%
Impax Large Cap Fund	10.3%
Impax International Sustainable Economy Fund	8.8%
Impax Small Cap Fund	6.2%
Impax High Yield Bond Fund	5.1%
Impax Global Sustainable Infrastructure ETF	3.0%
Impax Global Environmental Markets Fund	2.3%
Impax Global Opportunities Fund	2.1%

Material Fund Change [Text Block]

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Industry Diversification as of June 30, 2026Footnote Reference ^

Asset Allocation as of June 30, 2026Footnote Reference ^

Top Ten Holdings as of June 30, 2026Footnote Reference*

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Industry Diversification as of June 30, 2026Footnote Reference ^

Asset Allocation as of June 30, 2026Footnote Reference ^

Top Ten Holdings as of June 30, 2026Footnote Reference*

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Industry Diversification as of June 30, 2026Footnote Reference ^

Asset Allocation as of June 30, 2026Footnote Reference ^

Top Ten Holdings as of June 30, 2026Footnote Reference*

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Industry Diversification as of June 30, 2026Footnote Reference ^

Asset Allocation as of June 30, 2026Footnote Reference ^

Top Ten Holdings as of June 30, 2026Footnote Reference*

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Industry Diversification as of June 30, 2026Footnote Reference ^

Asset Allocation as of June 30, 2026Footnote Reference ^

Top Ten Holdings as of June 30, 2026Footnote Reference*

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Industry Diversification as of June 30, 2026Footnote Reference ^

Asset Allocation as of June 30, 2026Footnote Reference ^

Top Ten Holdings as of June 30, 2026Footnote Reference*

Material Fund Changes

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Industry Diversification as of June 30, 2026Footnote Reference ^

Asset Allocation as of June 30, 2026Footnote Reference ^

Top Ten Holdings as of June 30, 2026Footnote Reference*

Material Fund Changes

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Industry Diversification as of June 30, 2026Footnote Reference ^

Asset Allocation as of June 30, 2026Footnote Reference ^

Top Ten Holdings as of June 30, 2026Footnote Reference*

Material Fund Changes

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Geographical Diversification as of June 30, 2026Footnote Reference ^

Asset Allocation as of June 30, 2026Footnote Reference ^

Top Ten Holdings as of June 30, 2026Footnote Reference*

Material Fund Changes

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Geographical Diversification as of June 30, 2026Footnote Reference ^

Asset Allocation as of June 30, 2026Footnote Reference ^

Top Ten Holdings as of June 30, 2026Footnote Reference*

Material Fund Changes

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Geographical Diversification as of June 30, 2026Footnote Reference ^

Asset Allocation as of June 30, 2026Footnote Reference ^

Top Ten Holdings as of June 30, 2026Footnote Reference*

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Geographical Diversification as of June 30, 2026Footnote Reference ^

Asset Allocation as of June 30, 2026Footnote Reference ^

Top Ten Holdings as of June 30, 2026Footnote Reference*

What were the Fund's costs for the last six months?

Key Fund Statistics as of June 30, 2026

Sector Diversification as of June 30, 2026Footnote Reference *Footnote Reference ^

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Industry Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Geographical Diversification as of June 30, 2026^{Footnote Reference ^}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Credit Quality Allocation as of June 30, 2026^{Footnote Reference ^}^{Footnote Reference*}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Credit Quality Allocation as of June 30, 2026^{Footnote Reference ^}^{Footnote Reference*}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Credit Quality Allocation as of June 30, 2026^{Footnote Reference ^}^{Footnote Reference*}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Credit Quality Allocation as of June 30, 2026^{Footnote Reference ^}^{Footnote Reference*}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}

Sector Diversification as of June 30, 2026^{Footnote Reference *}^{Footnote Reference ^}

Credit Quality Allocation as of June 30, 2026^{Footnote Reference ^}^{Footnote Reference*}

Asset Allocation as of June 30, 2026^{Footnote Reference ^}

Top Ten Holdings as of June 30, 2026^{Footnote Reference*}