Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FIDELITY SCHOOL STREET TRUST
Prospectus Date	rr_ProspectusDate	Feb. 28, 2015
I | Fidelity Global Bond Fund
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	fsst_SupplementTextBlock	Supplement to the Fidelity Advisor® Global Bond Fund Institutional Class February 28, 2015 Prospectus Effective October 1, 2015, the fund changed its classification from a non-diversified fund to a diversified fund. Effective July 1, 2015, Institutional Class will be renamed Class I. The features and policies of the class will not change.