Expense Example - FidelitySAIInternationalIndexFunds-ComboPRO - FidelitySAIInternationalIndexFunds-ComboPRO - Fidelity SAI Emerging Markets Value Index Fund - Fidelity SAI Emerging Markets Value Index Fund	Dec. 30, 2022 USD ($)
Expense Example:
1 year	$ 23
3 years	71
5 years	124
10 years	$ 280