Shareholder Report, Holdings (Details)	May 31, 2024
Fidelity New Jersey Municipal Money Market Fund - Institutional Class \| EMD0Member
Holdings [Line Items]
Percent of Net Asset Value	69.30%
Fidelity New Jersey Municipal Money Market Fund - Institutional Class \| EMD1Member
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Fidelity New Jersey Municipal Money Market Fund - Institutional Class \| EMD2Member
Holdings [Line Items]
Percent of Net Asset Value	6.70%
Fidelity New Jersey Municipal Money Market Fund - Institutional Class \| EMD3Member
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Fidelity New Jersey Municipal Money Market Fund - Institutional Class \| EMD4Member
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Fidelity New Jersey Municipal Money Market Fund - Institutional Class \| EMD5Member
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Fidelity New Jersey Municipal Money Market Fund - Institutional Class \| AAVariableRateDemandNotesVRDNsMember
Holdings [Line Items]
Percent of Net Asset Value	35.40%
Fidelity New Jersey Municipal Money Market Fund - Institutional Class \| AATenderOptionBondMember
Holdings [Line Items]
Percent of Net Asset Value	24.20%
Fidelity New Jersey Municipal Money Market Fund - Institutional Class \| AAMunicipalSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	24.10%
Fidelity New Jersey Municipal Money Market Fund - Institutional Class \| AACommercialPaperMember
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Fidelity New Jersey Municipal Money Market Fund - Institutional Class \| AANetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	15.00%
Fidelity New Jersey Municipal Money Market Fund - Premium Class \| EMD0Member
Holdings [Line Items]
Percent of Net Asset Value	69.30%
Fidelity New Jersey Municipal Money Market Fund - Premium Class \| EMD1Member
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Fidelity New Jersey Municipal Money Market Fund - Premium Class \| EMD2Member
Holdings [Line Items]
Percent of Net Asset Value	6.70%
Fidelity New Jersey Municipal Money Market Fund - Premium Class \| EMD3Member
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Fidelity New Jersey Municipal Money Market Fund - Premium Class \| EMD4Member
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Fidelity New Jersey Municipal Money Market Fund - Premium Class \| EMD5Member
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Fidelity New Jersey Municipal Money Market Fund - Premium Class \| AAVariableRateDemandNotesVRDNsMember
Holdings [Line Items]
Percent of Net Asset Value	35.40%
Fidelity New Jersey Municipal Money Market Fund - Premium Class \| AATenderOptionBondMember
Holdings [Line Items]
Percent of Net Asset Value	24.20%
Fidelity New Jersey Municipal Money Market Fund - Premium Class \| AAMunicipalSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	24.10%
Fidelity New Jersey Municipal Money Market Fund - Premium Class \| AACommercialPaperMember
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Fidelity New Jersey Municipal Money Market Fund - Premium Class \| AANetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	15.00%
Fidelity New Jersey Municipal Money Market Fund \| EMD0Member
Holdings [Line Items]
Percent of Net Asset Value	69.30%
Fidelity New Jersey Municipal Money Market Fund \| EMD1Member
Holdings [Line Items]
Percent of Net Asset Value	1.80%
Fidelity New Jersey Municipal Money Market Fund \| EMD2Member
Holdings [Line Items]
Percent of Net Asset Value	6.70%
Fidelity New Jersey Municipal Money Market Fund \| EMD3Member
Holdings [Line Items]
Percent of Net Asset Value	2.70%
Fidelity New Jersey Municipal Money Market Fund \| EMD4Member
Holdings [Line Items]
Percent of Net Asset Value	4.80%
Fidelity New Jersey Municipal Money Market Fund \| EMD5Member
Holdings [Line Items]
Percent of Net Asset Value	11.10%
Fidelity New Jersey Municipal Money Market Fund \| AAVariableRateDemandNotesVRDNsMember
Holdings [Line Items]
Percent of Net Asset Value	35.40%
Fidelity New Jersey Municipal Money Market Fund \| AATenderOptionBondMember
Holdings [Line Items]
Percent of Net Asset Value	24.20%
Fidelity New Jersey Municipal Money Market Fund \| AAMunicipalSecuritiesMember
Holdings [Line Items]
Percent of Net Asset Value	24.10%
Fidelity New Jersey Municipal Money Market Fund \| AACommercialPaperMember
Holdings [Line Items]
Percent of Net Asset Value	1.30%
Fidelity New Jersey Municipal Money Market Fund \| AANetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	15.00%

Shareholder Report, Holdings (Details)

May 31, 2024