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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2021
Entity Registrant Name dei_EntityRegistrantName Pax World Funds Series Trust I
Entity Central Index Key dei_EntityCentralIndexKey 0000076721
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Nov. 15, 2022
Document Effective Date dei_DocumentEffectiveDate Nov. 15, 2022
Prospectus Date rr_ProspectusDate May 02, 2022
Pax Global Sustainable Infrastructure Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

3)Effective immediately, the FTSE Global Infrastructure Opportunities Index will replace the S&P Global Infrastructure (Net) Index as the primary benchmark for Pax Global Sustainable Infrastructure Fund because IAM believes the FTSE Global Infrastructure Opportunities Index is a more appropriate broad-based securities market index representing the universe of securities in which the Fund may invest.