v3.25.2
Shareholder Report, Holdings (Details)
Jul. 31, 2025
Fidelity Real Estate Investment Portfolio | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.90%
Fidelity Real Estate Investment Portfolio | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 9.20%
Fidelity Real Estate Investment Portfolio | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.70%
Fidelity Real Estate Investment Portfolio | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 7.50%
Fidelity Real Estate Investment Portfolio | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
Fidelity Real Estate Investment Portfolio | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity Real Estate Investment Portfolio | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
Fidelity Real Estate Investment Portfolio | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Fidelity Real Estate Investment Portfolio | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
Fidelity Real Estate Investment Portfolio | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.90%
Fidelity Real Estate Investment Portfolio | TI0Member  
Holdings [Line Items]  
Percent of Net Asset Value 35.60%
Fidelity Real Estate Investment Portfolio | TI1Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.60%
Fidelity Real Estate Investment Portfolio | TI2Member  
Holdings [Line Items]  
Percent of Net Asset Value 15.40%
Fidelity Real Estate Investment Portfolio | TI3Member  
Holdings [Line Items]  
Percent of Net Asset Value 13.70%
Fidelity Real Estate Investment Portfolio | TI4Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
Fidelity Real Estate Investment Portfolio | TI5Member  
Holdings [Line Items]  
Percent of Net Asset Value 8.10%
Fidelity Real Estate Investment Portfolio | United States  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
Fidelity Real Estate Investment Portfolio | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 99.60%
Fidelity Real Estate Investment Portfolio | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 0.40%
Fidelity International Real Estate Fund | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity International Real Estate Fund | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity International Real Estate Fund | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity International Real Estate Fund | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity International Real Estate Fund | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity International Real Estate Fund | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity International Real Estate Fund | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity International Real Estate Fund | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity International Real Estate Fund | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Fidelity International Real Estate Fund | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Fidelity International Real Estate Fund | TI0Member  
Holdings [Line Items]  
Percent of Net Asset Value 41.10%
Fidelity International Real Estate Fund | TI1Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
Fidelity International Real Estate Fund | TI2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
Fidelity International Real Estate Fund | TI3Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity International Real Estate Fund | TI4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Fidelity International Real Estate Fund | TI5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity International Real Estate Fund | TI6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity International Real Estate Fund | TI7Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity International Real Estate Fund | TI8Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity International Real Estate Fund | TI9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity International Real Estate Fund | United States  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Fidelity International Real Estate Fund | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 20.70%
Fidelity International Real Estate Fund | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 14.10%
Fidelity International Real Estate Fund | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity International Real Estate Fund | Singapore  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
Fidelity International Real Estate Fund | Belgium  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
Fidelity International Real Estate Fund | France  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity International Real Estate Fund | Hong Kong  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity International Real Estate Fund | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity International Real Estate Fund | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
Fidelity International Real Estate Fund | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 95.00%
Fidelity International Real Estate Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Fidelity Advisor International Real Estate Fund - Class Z | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class Z | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Advisor International Real Estate Fund - Class Z | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Advisor International Real Estate Fund - Class Z | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class Z | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class Z | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class Z | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Advisor International Real Estate Fund - Class Z | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Advisor International Real Estate Fund - Class Z | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Fidelity Advisor International Real Estate Fund - Class Z | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Fidelity Advisor International Real Estate Fund - Class Z | TI0Member  
Holdings [Line Items]  
Percent of Net Asset Value 41.10%
Fidelity Advisor International Real Estate Fund - Class Z | TI1Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
Fidelity Advisor International Real Estate Fund - Class Z | TI2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
Fidelity Advisor International Real Estate Fund - Class Z | TI3Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor International Real Estate Fund - Class Z | TI4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Fidelity Advisor International Real Estate Fund - Class Z | TI5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Advisor International Real Estate Fund - Class Z | TI6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Advisor International Real Estate Fund - Class Z | TI7Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Advisor International Real Estate Fund - Class Z | TI8Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor International Real Estate Fund - Class Z | TI9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Advisor International Real Estate Fund - Class Z | United States  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Fidelity Advisor International Real Estate Fund - Class Z | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 20.70%
Fidelity Advisor International Real Estate Fund - Class Z | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 14.10%
Fidelity Advisor International Real Estate Fund - Class Z | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor International Real Estate Fund - Class Z | Singapore  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
Fidelity Advisor International Real Estate Fund - Class Z | Belgium  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
Fidelity Advisor International Real Estate Fund - Class Z | France  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class Z | Hong Kong  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class Z | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity Advisor International Real Estate Fund - Class Z | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
Fidelity Advisor International Real Estate Fund - Class Z | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 95.00%
Fidelity Advisor International Real Estate Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Fidelity Advisor International Real Estate Fund - Class M | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class M | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Advisor International Real Estate Fund - Class M | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Advisor International Real Estate Fund - Class M | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class M | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class M | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class M | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Advisor International Real Estate Fund - Class M | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Advisor International Real Estate Fund - Class M | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Fidelity Advisor International Real Estate Fund - Class M | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Fidelity Advisor International Real Estate Fund - Class M | TI0Member  
Holdings [Line Items]  
Percent of Net Asset Value 41.10%
Fidelity Advisor International Real Estate Fund - Class M | TI1Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
Fidelity Advisor International Real Estate Fund - Class M | TI2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
Fidelity Advisor International Real Estate Fund - Class M | TI3Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor International Real Estate Fund - Class M | TI4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Fidelity Advisor International Real Estate Fund - Class M | TI5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Advisor International Real Estate Fund - Class M | TI6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Advisor International Real Estate Fund - Class M | TI7Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Advisor International Real Estate Fund - Class M | TI8Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor International Real Estate Fund - Class M | TI9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Advisor International Real Estate Fund - Class M | United States  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Fidelity Advisor International Real Estate Fund - Class M | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 20.70%
Fidelity Advisor International Real Estate Fund - Class M | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 14.10%
Fidelity Advisor International Real Estate Fund - Class M | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor International Real Estate Fund - Class M | Singapore  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
Fidelity Advisor International Real Estate Fund - Class M | Belgium  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
Fidelity Advisor International Real Estate Fund - Class M | France  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class M | Hong Kong  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class M | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity Advisor International Real Estate Fund - Class M | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
Fidelity Advisor International Real Estate Fund - Class M | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 95.00%
Fidelity Advisor International Real Estate Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Fidelity Advisor International Real Estate Fund - Class I | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class I | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Advisor International Real Estate Fund - Class I | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Advisor International Real Estate Fund - Class I | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class I | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class I | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class I | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Advisor International Real Estate Fund - Class I | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Advisor International Real Estate Fund - Class I | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Fidelity Advisor International Real Estate Fund - Class I | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Fidelity Advisor International Real Estate Fund - Class I | TI0Member  
Holdings [Line Items]  
Percent of Net Asset Value 41.10%
Fidelity Advisor International Real Estate Fund - Class I | TI1Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
Fidelity Advisor International Real Estate Fund - Class I | TI2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
Fidelity Advisor International Real Estate Fund - Class I | TI3Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor International Real Estate Fund - Class I | TI4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Fidelity Advisor International Real Estate Fund - Class I | TI5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Advisor International Real Estate Fund - Class I | TI6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Advisor International Real Estate Fund - Class I | TI7Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Advisor International Real Estate Fund - Class I | TI8Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor International Real Estate Fund - Class I | TI9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Advisor International Real Estate Fund - Class I | United States  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Fidelity Advisor International Real Estate Fund - Class I | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 20.70%
Fidelity Advisor International Real Estate Fund - Class I | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 14.10%
Fidelity Advisor International Real Estate Fund - Class I | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor International Real Estate Fund - Class I | Singapore  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
Fidelity Advisor International Real Estate Fund - Class I | Belgium  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
Fidelity Advisor International Real Estate Fund - Class I | France  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class I | Hong Kong  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class I | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity Advisor International Real Estate Fund - Class I | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
Fidelity Advisor International Real Estate Fund - Class I | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 95.00%
Fidelity Advisor International Real Estate Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Fidelity Advisor International Real Estate Fund - Class C | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class C | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Advisor International Real Estate Fund - Class C | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Advisor International Real Estate Fund - Class C | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class C | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class C | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class C | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Advisor International Real Estate Fund - Class C | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Advisor International Real Estate Fund - Class C | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Fidelity Advisor International Real Estate Fund - Class C | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Fidelity Advisor International Real Estate Fund - Class C | TI0Member  
Holdings [Line Items]  
Percent of Net Asset Value 41.10%
Fidelity Advisor International Real Estate Fund - Class C | TI1Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
Fidelity Advisor International Real Estate Fund - Class C | TI2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
Fidelity Advisor International Real Estate Fund - Class C | TI3Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor International Real Estate Fund - Class C | TI4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Fidelity Advisor International Real Estate Fund - Class C | TI5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Advisor International Real Estate Fund - Class C | TI6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Advisor International Real Estate Fund - Class C | TI7Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Advisor International Real Estate Fund - Class C | TI8Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor International Real Estate Fund - Class C | TI9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Advisor International Real Estate Fund - Class C | United States  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Fidelity Advisor International Real Estate Fund - Class C | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 20.70%
Fidelity Advisor International Real Estate Fund - Class C | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 14.10%
Fidelity Advisor International Real Estate Fund - Class C | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor International Real Estate Fund - Class C | Singapore  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
Fidelity Advisor International Real Estate Fund - Class C | Belgium  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
Fidelity Advisor International Real Estate Fund - Class C | France  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class C | Hong Kong  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class C | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity Advisor International Real Estate Fund - Class C | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
Fidelity Advisor International Real Estate Fund - Class C | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 95.00%
Fidelity Advisor International Real Estate Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
Fidelity Advisor International Real Estate Fund - Class A | TH0Member  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class A | TH1Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Advisor International Real Estate Fund - Class A | TH2Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
Fidelity Advisor International Real Estate Fund - Class A | TH3Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class A | TH4Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class A | TH5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
Fidelity Advisor International Real Estate Fund - Class A | TH6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Advisor International Real Estate Fund - Class A | TH7Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.10%
Fidelity Advisor International Real Estate Fund - Class A | TH8Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
Fidelity Advisor International Real Estate Fund - Class A | TH9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
Fidelity Advisor International Real Estate Fund - Class A | TI0Member  
Holdings [Line Items]  
Percent of Net Asset Value 41.10%
Fidelity Advisor International Real Estate Fund - Class A | TI1Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.70%
Fidelity Advisor International Real Estate Fund - Class A | TI2Member  
Holdings [Line Items]  
Percent of Net Asset Value 11.20%
Fidelity Advisor International Real Estate Fund - Class A | TI3Member  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor International Real Estate Fund - Class A | TI4Member  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
Fidelity Advisor International Real Estate Fund - Class A | TI5Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.40%
Fidelity Advisor International Real Estate Fund - Class A | TI6Member  
Holdings [Line Items]  
Percent of Net Asset Value 3.30%
Fidelity Advisor International Real Estate Fund - Class A | TI7Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Advisor International Real Estate Fund - Class A | TI8Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.60%
Fidelity Advisor International Real Estate Fund - Class A | TI9Member  
Holdings [Line Items]  
Percent of Net Asset Value 2.80%
Fidelity Advisor International Real Estate Fund - Class A | United States  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
Fidelity Advisor International Real Estate Fund - Class A | Japan  
Holdings [Line Items]  
Percent of Net Asset Value 20.70%
Fidelity Advisor International Real Estate Fund - Class A | Australia  
Holdings [Line Items]  
Percent of Net Asset Value 14.10%
Fidelity Advisor International Real Estate Fund - Class A | United Kingdom  
Holdings [Line Items]  
Percent of Net Asset Value 10.20%
Fidelity Advisor International Real Estate Fund - Class A | Singapore  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
Fidelity Advisor International Real Estate Fund - Class A | Belgium  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
Fidelity Advisor International Real Estate Fund - Class A | France  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class A | Hong Kong  
Holdings [Line Items]  
Percent of Net Asset Value 4.90%
Fidelity Advisor International Real Estate Fund - Class A | Germany  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
Fidelity Advisor International Real Estate Fund - Class A | OtherMember  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
Fidelity Advisor International Real Estate Fund - Class A | AACommonStocksMember  
Holdings [Line Items]  
Percent of Net Asset Value 95.00%
Fidelity Advisor International Real Estate Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%