v3.25.2
Shareholder Report, Holdings (Details)
Jun. 30, 2025
Fidelity Series Emerging Markets Debt Local Currency Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.80%
Fidelity Series Emerging Markets Debt Local Currency Fund | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
Fidelity Series Emerging Markets Debt Local Currency Fund | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
Fidelity Series Emerging Markets Debt Local Currency Fund | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
Fidelity Series Emerging Markets Debt Local Currency Fund | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
Fidelity Series Emerging Markets Debt Local Currency Fund | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Series Emerging Markets Debt Local Currency Fund | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity Series Emerging Markets Debt Local Currency Fund | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity Series Emerging Markets Debt Local Currency Fund | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Fidelity Series Emerging Markets Debt Local Currency Fund | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Fidelity Series Emerging Markets Debt Local Currency Fund | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Fidelity Series Emerging Markets Debt Local Currency Fund | QDAAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Series Emerging Markets Debt Local Currency Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Fidelity Series Emerging Markets Debt Local Currency Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Series Emerging Markets Debt Local Currency Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 16.90%
Fidelity Series Emerging Markets Debt Local Currency Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 10.50%
Fidelity Series Emerging Markets Debt Local Currency Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 49.80%
Fidelity Series Emerging Markets Debt Local Currency Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
Fidelity Series Emerging Markets Debt Local Currency Fund | United States  
Holdings [Line Items]  
Percent of Net Asset Value 12.40%
Fidelity Series Emerging Markets Debt Local Currency Fund | Indonesia  
Holdings [Line Items]  
Percent of Net Asset Value 9.80%
Fidelity Series Emerging Markets Debt Local Currency Fund | Malaysia  
Holdings [Line Items]  
Percent of Net Asset Value 9.40%
Fidelity Series Emerging Markets Debt Local Currency Fund | Mexico  
Holdings [Line Items]  
Percent of Net Asset Value 8.60%
Fidelity Series Emerging Markets Debt Local Currency Fund | Brazil  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
Fidelity Series Emerging Markets Debt Local Currency Fund | South Africa  
Holdings [Line Items]  
Percent of Net Asset Value 6.80%
Fidelity Series Emerging Markets Debt Local Currency Fund | India  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
Fidelity Series Emerging Markets Debt Local Currency Fund | Thailand  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Series Emerging Markets Debt Local Currency Fund | China  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity Series Emerging Markets Debt Local Currency Fund | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 29.10%
Fidelity Series Emerging Markets Debt Local Currency Fund | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 85.00%
Fidelity Series Emerging Markets Debt Local Currency Fund | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Series Emerging Markets Debt Local Currency Fund | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Fidelity Series Emerging Markets Debt Local Currency Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
Fidelity Series Emerging Markets Debt Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Series Emerging Markets Debt Fund | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Series Emerging Markets Debt Fund | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Series Emerging Markets Debt Fund | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Fidelity Series Emerging Markets Debt Fund | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.70%
Fidelity Series Emerging Markets Debt Fund | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Series Emerging Markets Debt Fund | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
Fidelity Series Emerging Markets Debt Fund | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.10%
Fidelity Series Emerging Markets Debt Fund | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
Fidelity Series Emerging Markets Debt Fund | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
Fidelity Series Emerging Markets Debt Fund | QDUSGovernmentandUSGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Series Emerging Markets Debt Fund | QDAAMember  
Holdings [Line Items]  
Percent of Net Asset Value 8.40%
Fidelity Series Emerging Markets Debt Fund | QDAMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.50%
Fidelity Series Emerging Markets Debt Fund | QDBBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 19.50%
Fidelity Series Emerging Markets Debt Fund | QDBBMember  
Holdings [Line Items]  
Percent of Net Asset Value 23.90%
Fidelity Series Emerging Markets Debt Fund | QDNotRatedMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Series Emerging Markets Debt Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
Fidelity Series Emerging Markets Debt Fund | QDBMember  
Holdings [Line Items]  
Percent of Net Asset Value 18.60%
Fidelity Series Emerging Markets Debt Fund | QDCCCCCCMember  
Holdings [Line Items]  
Percent of Net Asset Value 12.70%
Fidelity Series Emerging Markets Debt Fund | QDDMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.20%
Fidelity Series Emerging Markets Debt Fund | QDEquitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
Fidelity Series Emerging Markets Debt Fund | United States  
Holdings [Line Items]  
Percent of Net Asset Value 9.50%
Fidelity Series Emerging Markets Debt Fund | Mexico  
Holdings [Line Items]  
Percent of Net Asset Value 7.60%
Fidelity Series Emerging Markets Debt Fund | Brazil  
Holdings [Line Items]  
Percent of Net Asset Value 4.30%
Fidelity Series Emerging Markets Debt Fund | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 55.40%
Fidelity Series Emerging Markets Debt Fund | Colombia  
Holdings [Line Items]  
Percent of Net Asset Value 4.40%
Fidelity Series Emerging Markets Debt Fund | Saudi Arabia  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity Series Emerging Markets Debt Fund | United Arab Emirates  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Fidelity Series Emerging Markets Debt Fund | Chile  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Fidelity Series Emerging Markets Debt Fund | Turkey  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Series Emerging Markets Debt Fund | Dominican Republic  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Series Emerging Markets Debt Fund | AAForeignGovernmentandGovernmentAgencyObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 57.40%
Fidelity Series Emerging Markets Debt Fund | AACorporateBondsMember  
Holdings [Line Items]  
Percent of Net Asset Value 31.30%
Fidelity Series Emerging Markets Debt Fund | AAUSTreasuryObligationsMember  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Series Emerging Markets Debt Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 6.40%
Fidelity Series Emerging Markets Debt Fund | AAPreferredSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.70%
Fidelity Series Emerging Markets Debt Fund | AAPreferredStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%