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Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000076721_SupplementTextBlock

Pax World Funds Series Trust I


ESG Managers Income Portfolio


Supplement Dated May 30, 2013
to the
Prospectus


Dated May 1, 2013


Effective May 30, 2013, the table titled “Annual Fund Operating Expenses (Expenses You Pay Each Year as a Percentage of the Value of Your Investment” for the ESG Managers Income Portfolio on page 31 is deleted in its entirety and replaced with the following:

Risk/Return [Heading] rr_RiskReturnHeading ESG Managers Income Portfolio
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
Class A
  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Service (Rule 12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 3.34%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.22% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 4.56%
Contractual Reimbursements rr_FeeWaiverOrReimbursementOverAssets (3.27%) [2]
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.29%
Class C
  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Service (Rule 12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 3.34%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.22% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 5.31%
Contractual Reimbursements rr_FeeWaiverOrReimbursementOverAssets (3.27%) [2]
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 2.04%
Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.75%
Distribution and/or Service (Rule 12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 3.34%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.22% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 4.31%
Contractual Reimbursements rr_FeeWaiverOrReimbursementOverAssets (3.27%) [2]
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.04%
[1] Acquired Fund Fees and Expenses represent expenses indirectly borne by the Fund through its investment in other investment companies.
[2] The Adviser has agreed contractually to reimburse a portion of the Fund's expenses so that the Fund's ordinary operating expenses (excluding 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 exchange-traded funds) advised by the Adviser), as a percentage of its average net assets, do not exceed the following applicable rate (the "Cap") on an annualized basis on the Class A, Institutional Class and Class C shares, respectively: 1.14%, 0.89% and 1.89% . This reimbursement arrangement will continue in effect until at least December 31, 2015. If the Adviser reimburses expenses of a Fund pursuant to its Cap arrangement, the Adviser may recoup the amount of such reimbursement from such Fund at any time within three years after the year in which the Adviser incurred the reimbursement expense (the "Recovery Period") if, and only to the extent that, the Fund's annualized ordinary operating expense ratio is below the applicable Cap during the Recovery Period.