497

EXPLANATORY NOTE

Incorporated herein by reference is a supplement  to the Pax World Funds Series Trust I prospectus for Pax World ESG Managers Growth Portfolio, ESG Managers Income Portfolio, ESG Managers Growth and Income Portfolio, and ESG Managers Balanced Portfolio filed pursuant to Rule 497(e) under the Securities Act of 1933, as amended, on September 26, 2013 (SEC Accession No. 0001104659-13-072395).

XML

ESG Managers Income Portfolio

ESG Managers Income Portfolio

Pax World Funds Series Trust I

ESG Managers Asset Allocation Portfolios

Supplement Dated September 26, 2013

to the

Prospectus

Dated May 1, 2013

Beginning October 1, 2013, the ESG Managers Portfolios plan to invest primarily through mutual funds and/or exchange-traded funds (“ETFs”).  Pax World Management LLC has agreed, effective October 1, 2013, to reduce the management fees it is paid by each ESG Managers Portfolio with respect to the portion of assets invested in mutual funds and/or ETFs to an annual rate of 0.45% of the Fund’s average daily net assets that are so invested.

Accordingly, effective October 1, 2013, the tables entitled “Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment)” and “Example of Expenses” for each of the ESG Managers Portfolios are deleted in their entirety and replaced with the following:

Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment)

Annual Fund Operating Expenses ESG Managers Income Portfolio		Class A	Institutional Class	Class C
Management Fees	[1][2]	0.46%	0.46%	0.46%
Distribution and/or Service (Rule 12b-1) Fees		0.25%	none	1.00%
Other Expenses	[3]	3.01%	3.01%	3.01%
Acquired Fund Fees and Expenses	[1][4]	0.57%	0.57%	0.57%
Total Annual Fund Operating Expenses		4.29%	4.04%	5.04%
Contractual Reimbursements	[1][5]	(2.82%)	(2.82%)	(2.82%)
Net Annual Fund Operating Expenses		1.47%	1.22%	2.22%

Example of Expenses

The table below is intended to help an investor compare the cost of investing in shares of the Income Portfolio with the cost of investing in other mutual funds.

The table assumes that an investor invests $10,000 in shares of the applicable Class 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 Class’s operating expenses remain the same throughout those periods. 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:

Expense Example ESG Managers Income Portfolio (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	593	1,181	2,072	4,355
Institutional Class	124	691	1,578	3,871
Class C	325	989	2,053	4,709

Expense Example No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
ESG Managers Income Portfolio Class C	225	989	2,053	4,709

[1] Restated to give effect to contractual changes effective October 1, 2013, assuming assets allocated to certain Sleeve Subadvisers during the most recent fiscal year were instead allocated to mutual funds or ETFs advised or subadvised by such Sleeve Subadvisers.

[2] This fee is blended, applying the reduced 0.45% management fee to the portion of fund assets allocated to mutual funds or ETFs, and applying previously existing management fees to the portion of fund assets managed directly by Sleeve Subadvisers.

[3] Restated to reflect cost savings that will result from contractual changes effective October 1, 2013, including contractual reductions in custody and fund accounting service fees.

[4] Acquired Fund Fees and Expenses represent expenses indirectly borne by the Fund through its investment in other investment companies.

[5] The Adviser has agreed contractually to reimburse a portion of the Fund's expenses so that the Fund's Other Expenses (excluding management fees, distribution and service fees, interest, taxes, certain securities lending costs, brokerage commissions, extraordinary expenses and Acquired Fund Fees and Expenses other than those attributable to advisory fees indirectly borne by the Fund through its investment in funds (other than ETFs) advised by the Adviser), as a percentage of its average net assets, do not exceed 0.24% on an annualized basis. This reimbursement arrangement will continue in effect until at least December 31, 2015 unless modified or terminated by the Fund's Trustees.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

ck0000076721_SupplementTextBlock

Pax World Funds Series Trust I

ESG Managers Asset Allocation Portfolios

Supplement Dated September 26, 2013

to the

Prospectus

Dated May 1, 2013

Risk/Return [Heading]

rr_RiskReturnHeading

ESG Managers Growth Portfolio

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

Beginning October 1, 2013, the ESG Managers Portfolios plan to invest primarily through mutual funds and/or exchange-traded funds (“ETFs”).  Pax World Management LLC has agreed, effective October 1, 2013, to reduce the management fees it is paid by each ESG Managers Portfolio with respect to the portion of assets invested in mutual funds and/or ETFs to an annual rate of 0.45% of the Fund’s average daily net assets that are so invested.

Accordingly, effective October 1, 2013, the tables entitled “Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment)” and “Example of Expenses” for each of the ESG Managers Portfolios are deleted in their entirety and replaced with the following:

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

2015-12-31

Expense Example [Heading]

rr_ExpenseExampleHeading

Example of Expenses

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The table below is intended to help an investor compare the cost of investing in shares of the Growth Portfolio with the cost of investing in other mutual funds.

The table assumes that an investor invests $10,000 in shares of the applicable Class 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 Class’s operating expenses remain the same throughout those periods. 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:

Class A

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.51%

^[1],[2]

Distribution and/or Service (Rule 12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

1.83%

^[3]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.69%

^[1],[4]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

3.28%

Contractual Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(1.56%)

^[1],[5]

Net Annual Fund Operating Expenses

rr_NetExpensesOverAssets

1.72%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 715

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,219

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,904

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

3,720

Institutional Class

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.51%

^[1],[2]

Distribution and/or Service (Rule 12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

1.83%

^[3]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.69%

^[1],[4]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

3.03%

Contractual Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(1.56%)

^[1],[5]

Net Annual Fund Operating Expenses

rr_NetExpensesOverAssets

1.47%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

150

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

632

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,308

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

3,116

Class C

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.51%

^[1],[2]

Distribution and/or Service (Rule 12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

1.83%

^[3]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.69%

^[1],[4]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

4.03%

Contractual Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(1.56%)

^[1],[5]

Net Annual Fund Operating Expenses

rr_NetExpensesOverAssets

2.47%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

350

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

932

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,796

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

4,030

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

250

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

932

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,796

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 4,030

[1] Restated to give effect to contractual changes effective October 1, 2013, assuming assets allocated to certain Sleeve Subadvisers during the most recent fiscal year were instead allocated to mutual funds or ETFs advised or subadvised by such Sleeve Subadvisers.

[2] This fee is blended, applying the reduced 0.45% management fee to the portion of fund assets allocated to mutual funds or ETFs, and applying previously existing management fees to the portion of fund assets managed directly by Sleeve Subadvisers.

[3] Restated to reflect cost savings that will result from contractual changes effective October 1, 2013, including contractual reductions in custody and fund accounting service fees.

[4] Acquired Fund Fees and Expenses represent expenses indirectly borne by the Fund through its investment in other investment companies.

[5] The Adviser has agreed contractually to reimburse a portion of the Fund's expenses so that the Fund's Other Expenses (excluding management fees, distribution and service fees, interest, taxes, certain securities lending costs, brokerage commissions, extraordinary expenses and Acquired Fund Fees and Expenses other than those attributable to advisory fees indirectly borne by the Fund through its investment in funds (other than ETFs) advised by the Adviser), as a percentage of its average net assets, do not exceed 0.39% on an annualized basis. This reimbursement arrangement will continue in effect until at least December 31, 2015 unless modified or terminated by the Fund's Trustees.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

ck0000076721_SupplementTextBlock

Pax World Funds Series Trust I

ESG Managers Asset Allocation Portfolios

Supplement Dated September 26, 2013

to the

Prospectus

Dated May 1, 2013

Risk/Return [Heading]

rr_RiskReturnHeading

ESG Managers Growth and Income Portfolio

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

Beginning October 1, 2013, the ESG Managers Portfolios plan to invest primarily through mutual funds and/or exchange-traded funds (“ETFs”).  Pax World Management LLC has agreed, effective October 1, 2013, to reduce the management fees it is paid by each ESG Managers Portfolio with respect to the portion of assets invested in mutual funds and/or ETFs to an annual rate of 0.45% of the Fund’s average daily net assets that are so invested.

Accordingly, effective October 1, 2013, the tables entitled “Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment)” and “Example of Expenses” for each of the ESG Managers Portfolios are deleted in their entirety and replaced with the following:

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

2015-12-31

Expense Example [Heading]

rr_ExpenseExampleHeading

Example of Expenses

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The table below is intended to help an investor compare the cost of investing in shares of the Growth and Income Portfolio with the cost of investing in other mutual funds.

The table assumes that an investor invests $10,000 in shares of the applicable Class 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 Class’s operating expenses remain the same throughout those periods. 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:

Class A

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.50%

^[1],[2]

Distribution and/or Service (Rule 12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

2.23%

^[3]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.69%

^[1],[4]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

3.67%

Contractual Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(1.99%)

^[1],[5]

Net Annual Fund Operating Expenses

rr_NetExpensesOverAssets

1.68%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 711

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,251

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

2,011

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

4,002

Institutional Class

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.50%

^[1],[2]

Distribution and/or Service (Rule 12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

2.23%

^[3]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.69%

^[1],[4]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

3.42%

Contractual Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(1.99%)

^[1],[5]

Net Annual Fund Operating Expenses

rr_NetExpensesOverAssets

1.43%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

146

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

666

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,423

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

3,423

Class C

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.50%

^[1],[2]

Distribution and/or Service (Rule 12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

2.23%

^[3]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.69%

^[1],[4]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

4.42%

Contractual Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(1.99%)

^[1],[5]

Net Annual Fund Operating Expenses

rr_NetExpensesOverAssets

2.43%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

346

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

965

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,906

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

4,306

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

246

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

965

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,906

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 4,306

[1] Restated to give effect to contractual changes effective October 1, 2013, assuming assets allocated to certain Sleeve Subadvisers during the most recent fiscal year were instead allocated to mutual funds or ETFs advised or subadvised by such Sleeve Subadvisers.

[2] This fee is blended, applying the reduced 0.45% management fee to the portion of fund assets allocated to mutual funds or ETFs, and applying previously existing management fees to the portion of fund assets managed directly by Sleeve Subadvisers.

[3] Restated to reflect cost savings that will result from contractual changes effective October 1, 2013, including contractual reductions in custody and fund accounting service fees.

[4] Acquired Fund Fees and Expenses represent expenses indirectly borne by the Fund through its investment in other investment companies.

[5] The Adviser has agreed contractually to reimburse a portion of the Fund's expenses so that the Fund's Other Expenses (excluding management fees, distribution and service fees, interest, taxes, certain securities lending costs, brokerage commissions, extraordinary expenses and Acquired Fund Fees and Expenses other than those attributable to advisory fees indirectly borne by the Fund through its investment in funds (other than ETFs) advised by the Adviser), as a percentage of its average net assets, do not exceed 0.34% on an annualized basis. This reimbursement arrangement will continue in effect until at least December 31, 2015 unless modified or terminated by the Fund's Trustees.

XML

ESG Managers Growth Portfolio

ESG Managers Growth Portfolio

Pax World Funds Series Trust I

ESG Managers Asset Allocation Portfolios

Supplement Dated September 26, 2013

to the

Prospectus

Dated May 1, 2013

Beginning October 1, 2013, the ESG Managers Portfolios plan to invest primarily through mutual funds and/or exchange-traded funds (“ETFs”).  Pax World Management LLC has agreed, effective October 1, 2013, to reduce the management fees it is paid by each ESG Managers Portfolio with respect to the portion of assets invested in mutual funds and/or ETFs to an annual rate of 0.45% of the Fund’s average daily net assets that are so invested.

Accordingly, effective October 1, 2013, the tables entitled “Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment)” and “Example of Expenses” for each of the ESG Managers Portfolios are deleted in their entirety and replaced with the following:

Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment)

Annual Fund Operating Expenses ESG Managers Growth Portfolio		Class A	Institutional Class	Class C
Management Fees	[1][2]	0.51%	0.51%	0.51%
Distribution and/or Service (Rule 12b-1) Fees		0.25%	none	1.00%
Other Expenses	[3]	1.83%	1.83%	1.83%
Acquired Fund Fees and Expenses	[1][4]	0.69%	0.69%	0.69%
Total Annual Fund Operating Expenses		3.28%	3.03%	4.03%
Contractual Reimbursements	[1][5]	(1.56%)	(1.56%)	(1.56%)
Net Annual Fund Operating Expenses		1.72%	1.47%	2.47%

Example of Expenses

The table below is intended to help an investor compare the cost of investing in shares of the Growth Portfolio with the cost of investing in other mutual funds.

The table assumes that an investor invests $10,000 in shares of the applicable Class 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 Class’s operating expenses remain the same throughout those periods. 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:

Expense Example ESG Managers Growth Portfolio (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	715	1,219	1,904	3,720
Institutional Class	150	632	1,308	3,116
Class C	350	932	1,796	4,030

Expense Example No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
ESG Managers Growth Portfolio Class C	250	932	1,796	4,030

[1] Restated to give effect to contractual changes effective October 1, 2013, assuming assets allocated to certain Sleeve Subadvisers during the most recent fiscal year were instead allocated to mutual funds or ETFs advised or subadvised by such Sleeve Subadvisers.

[2] This fee is blended, applying the reduced 0.45% management fee to the portion of fund assets allocated to mutual funds or ETFs, and applying previously existing management fees to the portion of fund assets managed directly by Sleeve Subadvisers.

[3] Restated to reflect cost savings that will result from contractual changes effective October 1, 2013, including contractual reductions in custody and fund accounting service fees.

[4] Acquired Fund Fees and Expenses represent expenses indirectly borne by the Fund through its investment in other investment companies.

[5] The Adviser has agreed contractually to reimburse a portion of the Fund's expenses so that the Fund's Other Expenses (excluding management fees, distribution and service fees, interest, taxes, certain securities lending costs, brokerage commissions, extraordinary expenses and Acquired Fund Fees and Expenses other than those attributable to advisory fees indirectly borne by the Fund through its investment in funds (other than ETFs) advised by the Adviser), as a percentage of its average net assets, do not exceed 0.39% on an annualized basis. This reimbursement arrangement will continue in effect until at least December 31, 2015 unless modified or terminated by the Fund's Trustees.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

ck0000076721_SupplementTextBlock

Pax World Funds Series Trust I

ESG Managers Asset Allocation Portfolios

Supplement Dated September 26, 2013

to the

Prospectus

Dated May 1, 2013

Risk/Return [Heading]

rr_RiskReturnHeading

ESG Managers Balanced Portfolio

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

Beginning October 1, 2013, the ESG Managers Portfolios plan to invest primarily through mutual funds and/or exchange-traded funds (“ETFs”).  Pax World Management LLC has agreed, effective October 1, 2013, to reduce the management fees it is paid by each ESG Managers Portfolio with respect to the portion of assets invested in mutual funds and/or ETFs to an annual rate of 0.45% of the Fund’s average daily net assets that are so invested.

Accordingly, effective October 1, 2013, the tables entitled “Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment)” and “Example of Expenses” for each of the ESG Managers Portfolios are deleted in their entirety and replaced with the following:

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

2015-12-31

Expense Example [Heading]

rr_ExpenseExampleHeading

Example of Expenses

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The table below is intended to help an investor compare the cost of investing in shares of the Balanced Portfolio with the cost of investing in other mutual funds.

The table assumes that an investor invests $10,000 in shares of the applicable Class 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 Class’s operating expenses remain the same throughout those periods. 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:

Class A

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.48%

^[1],[2]

Distribution and/or Service (Rule 12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

1.74%

^[3]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.64%

^[1],[4]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

3.11%

Contractual Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(1.54%)

^[1],[5]

Net Annual Fund Operating Expenses

rr_NetExpensesOverAssets

1.57%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 701

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,174

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,827

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

3,570

Institutional Class

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.48%

^[1],[2]

Distribution and/or Service (Rule 12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

1.74%

^[3]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.64%

^[1],[4]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.86%

Contractual Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(1.54%)

^[1],[5]

Net Annual Fund Operating Expenses

rr_NetExpensesOverAssets

1.32%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

134

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

585

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,226

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,954

Class C

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.48%

^[1],[2]

Distribution and/or Service (Rule 12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

1.74%

^[3]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.64%

^[1],[4]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

3.86%

Contractual Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(1.54%)

^[1],[5]

Net Annual Fund Operating Expenses

rr_NetExpensesOverAssets

2.32%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

335

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

886

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,718

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

3,884

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

235

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

886

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,718

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 3,884

[1] Restated to give effect to contractual changes effective October 1, 2013, assuming assets allocated to certain Sleeve Subadvisers during the most recent fiscal year were instead allocated to mutual funds or ETFs advised or subadvised by such Sleeve Subadvisers.

[2] This fee is blended, applying the reduced 0.45% management fee to the portion of fund assets allocated to mutual funds or ETFs, and applying previously existing management fees to the portion of fund assets managed directly by Sleeve Subadvisers.

[3] Restated to reflect cost savings that will result from contractual changes effective October 1, 2013, including contractual reductions in custody and fund accounting service fees.

[4] Acquired Fund Fees and Expenses represent expenses indirectly borne by the Fund through its investment in other investment companies.

[5] The Adviser has agreed contractually to reimburse a portion of the Fund's expenses so that the Fund's Other Expenses (excluding management fees, distribution and service fees, interest, taxes, certain securities lending costs, brokerage commissions, extraordinary expenses and Acquired Fund Fees and Expenses other than those attributable to advisory fees indirectly borne by the Fund through its investment in funds (other than ETFs) advised by the Adviser), as a percentage of its average net assets, do not exceed 0.29% on an annualized basis. This reimbursement arrangement will continue in effect until at least December 31, 2015 unless modified or terminated by the Fund's Trustees.

XML

ESG Managers Balanced Portfolio

ESG Managers Balanced Portfolio

Pax World Funds Series Trust I

ESG Managers Asset Allocation Portfolios

Supplement Dated September 26, 2013

to the

Prospectus

Dated May 1, 2013

Beginning October 1, 2013, the ESG Managers Portfolios plan to invest primarily through mutual funds and/or exchange-traded funds (“ETFs”).  Pax World Management LLC has agreed, effective October 1, 2013, to reduce the management fees it is paid by each ESG Managers Portfolio with respect to the portion of assets invested in mutual funds and/or ETFs to an annual rate of 0.45% of the Fund’s average daily net assets that are so invested.

Accordingly, effective October 1, 2013, the tables entitled “Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment)” and “Example of Expenses” for each of the ESG Managers Portfolios are deleted in their entirety and replaced with the following:

Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment)

Annual Fund Operating Expenses ESG Managers Balanced Portfolio		Class A	Institutional Class	Class C
Management Fees	[1][2]	0.48%	0.48%	0.48%
Distribution and/or Service (Rule 12b-1) Fees		0.25%	none	1.00%
Other Expenses	[3]	1.74%	1.74%	1.74%
Acquired Fund Fees and Expenses	[1][4]	0.64%	0.64%	0.64%
Total Annual Fund Operating Expenses		3.11%	2.86%	3.86%
Contractual Reimbursements	[1][5]	(1.54%)	(1.54%)	(1.54%)
Net Annual Fund Operating Expenses		1.57%	1.32%	2.32%

Example of Expenses

The table below is intended to help an investor compare the cost of investing in shares of the Balanced Portfolio with the cost of investing in other mutual funds.

The table assumes that an investor invests $10,000 in shares of the applicable Class 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 Class’s operating expenses remain the same throughout those periods. 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:

Expense Example ESG Managers Balanced Portfolio (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	701	1,174	1,827	3,570
Institutional Class	134	585	1,226	2,954
Class C	335	886	1,718	3,884

Expense Example No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
ESG Managers Balanced Portfolio Class C	235	886	1,718	3,884

[1] Restated to give effect to contractual changes effective October 1, 2013, assuming assets allocated to certain Sleeve Subadvisers during the most recent fiscal year were instead allocated to mutual funds or ETFs advised or subadvised by such Sleeve Subadvisers.

[2] This fee is blended, applying the reduced 0.45% management fee to the portion of fund assets allocated to mutual funds or ETFs, and applying previously existing management fees to the portion of fund assets managed directly by Sleeve Subadvisers.

[3] Restated to reflect cost savings that will result from contractual changes effective October 1, 2013, including contractual reductions in custody and fund accounting service fees.

[4] Acquired Fund Fees and Expenses represent expenses indirectly borne by the Fund through its investment in other investment companies.

[5] The Adviser has agreed contractually to reimburse a portion of the Fund's expenses so that the Fund's Other Expenses (excluding management fees, distribution and service fees, interest, taxes, certain securities lending costs, brokerage commissions, extraordinary expenses and Acquired Fund Fees and Expenses other than those attributable to advisory fees indirectly borne by the Fund through its investment in funds (other than ETFs) advised by the Adviser), as a percentage of its average net assets, do not exceed 0.29% on an annualized basis. This reimbursement arrangement will continue in effect until at least December 31, 2015 unless modified or terminated by the Fund's Trustees.

XML

ESG Managers Growth and Income Portfolio

ESG Managers Growth and Income Portfolio

Pax World Funds Series Trust I

ESG Managers Asset Allocation Portfolios

Supplement Dated September 26, 2013

to the

Prospectus

Dated May 1, 2013

Beginning October 1, 2013, the ESG Managers Portfolios plan to invest primarily through mutual funds and/or exchange-traded funds (“ETFs”).  Pax World Management LLC has agreed, effective October 1, 2013, to reduce the management fees it is paid by each ESG Managers Portfolio with respect to the portion of assets invested in mutual funds and/or ETFs to an annual rate of 0.45% of the Fund’s average daily net assets that are so invested.

Accordingly, effective October 1, 2013, the tables entitled “Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment)” and “Example of Expenses” for each of the ESG Managers Portfolios are deleted in their entirety and replaced with the following:

Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment)

Annual Fund Operating Expenses ESG Managers Growth and Income Portfolio		Class A	Institutional Class	Class C
Management Fees	[1][2]	0.50%	0.50%	0.50%
Distribution and/or Service (Rule 12b-1) Fees		0.25%	none	1.00%
Other Expenses	[3]	2.23%	2.23%	2.23%
Acquired Fund Fees and Expenses	[1][4]	0.69%	0.69%	0.69%
Total Annual Fund Operating Expenses		3.67%	3.42%	4.42%
Contractual Reimbursements	[1][5]	(1.99%)	(1.99%)	(1.99%)
Net Annual Fund Operating Expenses		1.68%	1.43%	2.43%

Example of Expenses

The table below is intended to help an investor compare the cost of investing in shares of the Growth and Income Portfolio with the cost of investing in other mutual funds.

The table assumes that an investor invests $10,000 in shares of the applicable Class 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 Class’s operating expenses remain the same throughout those periods. 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:

Expense Example ESG Managers Growth and Income Portfolio (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	711	1,251	2,011	4,002
Institutional Class	146	666	1,423	3,423
Class C	346	965	1,906	4,306

Expense Example No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
ESG Managers Growth and Income Portfolio Class C	246	965	1,906	4,306

[1] Restated to give effect to contractual changes effective October 1, 2013, assuming assets allocated to certain Sleeve Subadvisers during the most recent fiscal year were instead allocated to mutual funds or ETFs advised or subadvised by such Sleeve Subadvisers.

[2] This fee is blended, applying the reduced 0.45% management fee to the portion of fund assets allocated to mutual funds or ETFs, and applying previously existing management fees to the portion of fund assets managed directly by Sleeve Subadvisers.

[3] Restated to reflect cost savings that will result from contractual changes effective October 1, 2013, including contractual reductions in custody and fund accounting service fees.

[4] Acquired Fund Fees and Expenses represent expenses indirectly borne by the Fund through its investment in other investment companies.

[5] The Adviser has agreed contractually to reimburse a portion of the Fund's expenses so that the Fund's Other Expenses (excluding management fees, distribution and service fees, interest, taxes, certain securities lending costs, brokerage commissions, extraordinary expenses and Acquired Fund Fees and Expenses other than those attributable to advisory fees indirectly borne by the Fund through its investment in funds (other than ETFs) advised by the Adviser), as a percentage of its average net assets, do not exceed 0.34% on an annualized basis. This reimbursement arrangement will continue in effect until at least December 31, 2015 unless modified or terminated by the Fund's Trustees.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Prospectus Date	rr_ProspectusDate	May 01, 2013

XML

Document and Entity Information	0 Months Ended
	Sep. 26, 2013
Risk/Return:
Document Type	497
Document Period End Date	Sep. 26, 2013
Registrant Name	PAX WORLD FUNDS SERIES TRUST I
Central Index Key	0000076721
Amendment Flag	false
Document Creation Date	Sep. 26, 2013
Document Effective Date	Sep. 26, 2013
Prospectus Date	May 01, 2013
ESG Managers Growth Portfolio | Class A
Risk/Return:
Trading Symbol	PAGAX
ESG Managers Growth Portfolio | Class C
Risk/Return:
Trading Symbol	PAGCX
ESG Managers Growth Portfolio | Institutional Class
Risk/Return:
Trading Symbol	PAGIX
ESG Managers Growth and Income Portfolio | Class A
Risk/Return:
Trading Symbol	PGPAX
ESG Managers Growth and Income Portfolio | Class C
Risk/Return:
Trading Symbol	PWCCX
ESG Managers Growth and Income Portfolio | Institutional Class
Risk/Return:
Trading Symbol	PMIIX
ESG Managers Balanced Portfolio | Class A
Risk/Return:
Trading Symbol	PMPAX
ESG Managers Balanced Portfolio | Class C
Risk/Return:
Trading Symbol	PWPCX
ESG Managers Balanced Portfolio | Institutional Class
Risk/Return:
Trading Symbol	PWPIX
ESG Managers Income Portfolio | Class A
Risk/Return:
Trading Symbol	PWMAX
ESG Managers Income Portfolio | Class C
Risk/Return:
Trading Symbol	PWMCX
ESG Managers Income Portfolio | Institutional Class
Risk/Return:
Trading Symbol	PWMIX

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

ck0000076721_SupplementTextBlock

Pax World Funds Series Trust I

ESG Managers Asset Allocation Portfolios

Supplement Dated September 26, 2013

to the

Prospectus

Dated May 1, 2013

Risk/Return [Heading]

rr_RiskReturnHeading

ESG Managers Income Portfolio

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

Beginning October 1, 2013, the ESG Managers Portfolios plan to invest primarily through mutual funds and/or exchange-traded funds (“ETFs”).  Pax World Management LLC has agreed, effective October 1, 2013, to reduce the management fees it is paid by each ESG Managers Portfolio with respect to the portion of assets invested in mutual funds and/or ETFs to an annual rate of 0.45% of the Fund’s average daily net assets that are so invested.

Accordingly, effective October 1, 2013, the tables entitled “Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment)” and “Example of Expenses” for each of the ESG Managers Portfolios are deleted in their entirety and replaced with the following:

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

2015-12-31

Expense Example [Heading]

rr_ExpenseExampleHeading

Example of Expenses

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The table below is intended to help an investor compare the cost of investing in shares of the Income Portfolio with the cost of investing in other mutual funds.

The table assumes that an investor invests $10,000 in shares of the applicable Class 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 Class’s operating expenses remain the same throughout those periods. 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:

Class A

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.46%

^[1],[2]

Distribution and/or Service (Rule 12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

3.01%

^[3]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.57%

^[1],[4]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

4.29%

Contractual Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(2.82%)

^[1],[5]

Net Annual Fund Operating Expenses

rr_NetExpensesOverAssets

1.47%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 593

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,181

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

2,072

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

4,355

Institutional Class

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.46%

^[1],[2]

Distribution and/or Service (Rule 12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

3.01%

^[3]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.57%

^[1],[4]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

4.04%

Contractual Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(2.82%)

^[1],[5]

Net Annual Fund Operating Expenses

rr_NetExpensesOverAssets

1.22%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

124

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

691

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,578

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

3,871

Class C

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.46%

^[1],[2]

Distribution and/or Service (Rule 12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

3.01%

^[3]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.57%

^[1],[4]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

5.04%

Contractual Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(2.82%)

^[1],[5]

Net Annual Fund Operating Expenses

rr_NetExpensesOverAssets

2.22%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

325

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

989

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

2,053

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

4,709

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

225

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

989

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

2,053

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 4,709

[1] Restated to give effect to contractual changes effective October 1, 2013, assuming assets allocated to certain Sleeve Subadvisers during the most recent fiscal year were instead allocated to mutual funds or ETFs advised or subadvised by such Sleeve Subadvisers.

[2] This fee is blended, applying the reduced 0.45% management fee to the portion of fund assets allocated to mutual funds or ETFs, and applying previously existing management fees to the portion of fund assets managed directly by Sleeve Subadvisers.

[3] Restated to reflect cost savings that will result from contractual changes effective October 1, 2013, including contractual reductions in custody and fund accounting service fees.

[4] Acquired Fund Fees and Expenses represent expenses indirectly borne by the Fund through its investment in other investment companies.

[5] The Adviser has agreed contractually to reimburse a portion of the Fund's expenses so that the Fund's Other Expenses (excluding management fees, distribution and service fees, interest, taxes, certain securities lending costs, brokerage commissions, extraordinary expenses and Acquired Fund Fees and Expenses other than those attributable to advisory fees indirectly borne by the Fund through its investment in funds (other than ETFs) advised by the Adviser), as a percentage of its average net assets, do not exceed 0.24% on an annualized basis. This reimbursement arrangement will continue in effect until at least December 31, 2015 unless modified or terminated by the Fund's Trustees.