Expense Example - FidelitySAIRealEstateFund-PRO - FidelitySAIRealEstateFund-PRO - Fidelity SAI Real Estate Fund - Fidelity SAI Real Estate Fund	Jul. 10, 2024 USD ($)
Expense Example:
1 year	$ 57
3 years	$ 179

The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 3
-Subsection example
-Paragraph 1
-Subparagraph 2

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Namespace Prefix:	rr_
Data Type:	rr:NonNegativeMonetaryType
Balance Type:	na
Period Type:	duration