2.4.0.8020001 - Disclosure - Risk/Return Detail Data {Elements} - Pax World Global Environmental Markets Fundtruetruefalse1false falsefalseS000021458Memberhttp://www.sec.gov/CIK0000076721duration2013-07-31T00:00:002013-07-31T00:00:001false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse1false truefalseS000021458Memberhttp://www.sec.gov/CIK0000076721duration2013-07-31T00:00:002013-07-31T00:00:00falsefalsePax World Global Environmental Markets Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000076721_S000021458Memberdei_LegalEntityAxisexplicitMembernanafalse0Pax World Global Environmental Markets Fund2true 3rr_RiskReturnAbstractrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Risk/Return:3false 4ck0000076721_SupplementTextBlockck0000076721_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 PAX WORLD FUNDS SERIES TRUST I PAX WORLD GLOBAL ENVIRONMENTAL MARKETS FUND Supplement Dated August 1, 2013 to the Prospectus Dated May 1, 2013 falsefalsefalsenonnum:textBlockItemTypenaNo authoritative reference available.No definition available.false0Supplement [Text Block]4false 4rr_RiskReturnHeadingrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00Pax World Global Environmental Markets Fundfalsefalsefalsexbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 false0Risk/Return [Heading]5false 4rr_StrategyNarrativeTextBlockrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00 Effective August 1, 2013, the Prospectus is amended, as follows: 1)             The following sentence is added to the fourth full paragraph on page 49, in the subsection of the Prospectus titled “Principal Investment Strategies” in the section captioned “Pax World Global Environmental Markets Fund:” In addition, the Fund strives to be fossil fuel-free (avoiding investing in companies that the Adviser determines are significantly involved in the extraction and/or refining of fossil fuels) and carbon neutral (through carbon offsets acquired by the Adviser and other measures), as determined by an independent evaluator. The next paragraph, which begins on page 49 and carries over to page 50, is deleted in its entirety and replaced with the following: The Global Environmental Markets Fund avoids investing in companies that the Adviser determines are significantly involved in the extraction and/or refining of fossil fuels (coal, oil and gas), in the manufacture of weapons or weapons-related products, manufacture tobacco products or engage in unethical business practices. falsefalsefalsenonnum:textBlockItemTypenaPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a false0Strategy Narrative [Text Block]falseRisk/Return Detail Data - Pax World Global Environmental Markets Fund (Pax World Global Environmental Markets Fund)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://paxworld.com/20130731/role/DisclosureRiskReturnDetailDataElementsPaxWorldGlobalEnvironmentalMarketsFund15