v3.26.3
Shareholder Report, Holdings (Details)
Jul. 31, 2026
Fidelity New York Municipal Money Market Fund | EMD0Member  
Holdings [Line Items]  
Percent of Net Asset Value 82.60%
Fidelity New York Municipal Money Market Fund | EMD1Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity New York Municipal Money Market Fund | EMD2Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity New York Municipal Money Market Fund | EMD3Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity New York Municipal Money Market Fund | EMD4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity New York Municipal Money Market Fund | EMD5Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
Fidelity New York Municipal Money Market Fund | AAVariableRateDemandNotesVRDNsMember  
Holdings [Line Items]  
Percent of Net Asset Value 46.80%
Fidelity New York Municipal Money Market Fund | AATenderOptionBondMember  
Holdings [Line Items]  
Percent of Net Asset Value 33.20%
Fidelity New York Municipal Money Market Fund | AAMunicipalSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 13.40%
Fidelity New York Municipal Money Market Fund | AACommercialPaperMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
Fidelity New York Municipal Money Market Fund | AANetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Fidelity New York Municipal Money Market Fund - Premium Class | EMD0Member  
Holdings [Line Items]  
Percent of Net Asset Value 82.60%
Fidelity New York Municipal Money Market Fund - Premium Class | EMD1Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity New York Municipal Money Market Fund - Premium Class | EMD2Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity New York Municipal Money Market Fund - Premium Class | EMD3Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity New York Municipal Money Market Fund - Premium Class | EMD4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity New York Municipal Money Market Fund - Premium Class | EMD5Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
Fidelity New York Municipal Money Market Fund - Premium Class | AAVariableRateDemandNotesVRDNsMember  
Holdings [Line Items]  
Percent of Net Asset Value 46.80%
Fidelity New York Municipal Money Market Fund - Premium Class | AATenderOptionBondMember  
Holdings [Line Items]  
Percent of Net Asset Value 33.20%
Fidelity New York Municipal Money Market Fund - Premium Class | AAMunicipalSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 13.40%
Fidelity New York Municipal Money Market Fund - Premium Class | AACommercialPaperMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
Fidelity New York Municipal Money Market Fund - Premium Class | AANetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
Fidelity New York Municipal Money Market Fund - Institutional Class | EMD0Member  
Holdings [Line Items]  
Percent of Net Asset Value 82.60%
Fidelity New York Municipal Money Market Fund - Institutional Class | EMD1Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity New York Municipal Money Market Fund - Institutional Class | EMD2Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity New York Municipal Money Market Fund - Institutional Class | EMD3Member  
Holdings [Line Items]  
Percent of Net Asset Value 0.70%
Fidelity New York Municipal Money Market Fund - Institutional Class | EMD4Member  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
Fidelity New York Municipal Money Market Fund - Institutional Class | EMD5Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.50%
Fidelity New York Municipal Money Market Fund - Institutional Class | AAVariableRateDemandNotesVRDNsMember  
Holdings [Line Items]  
Percent of Net Asset Value 46.80%
Fidelity New York Municipal Money Market Fund - Institutional Class | AATenderOptionBondMember  
Holdings [Line Items]  
Percent of Net Asset Value 33.20%
Fidelity New York Municipal Money Market Fund - Institutional Class | AAMunicipalSecuritiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 13.40%
Fidelity New York Municipal Money Market Fund - Institutional Class | AACommercialPaperMember  
Holdings [Line Items]  
Percent of Net Asset Value 1.90%
Fidelity New York Municipal Money Market Fund - Institutional Class | AANetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%