Annual Operating Expenses - FidelitySAIInternationalIndexFunds-ComboPRO - FidelitySAIInternationalIndexFunds-ComboPRO - Fidelity SAI Emerging Markets Value Index Fund - Fidelity SAI Emerging Markets Value Index Fund	Dec. 30, 2024
Operating Expenses:
Management fee	0.15%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.06%
Total annual operating expenses	0.21%