v3.26.1
Shareholder Report
 6 Months Ended
Apr. 30, 2026
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Fidelity Advisor Series VIII
Entity Central Index Key 0000729218
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
Fidelity Advisor International Capital Appreciation Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® International Capital Appreciation Fund
Class Name Fidelity Advisor® International Capital Appreciation Fund Class Z
Trading Symbol FIDZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® International Capital Appreciation Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class Z 
$ 31 
0.62%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.62%
Net Assets $ 16,250,767,968
Holdings Count | shares 64
Investment Company Portfolio Turnover 135.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$16,250,767,968
  
Number of Holdings
64
  
Portfolio Turnover
135%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Industrials 33.2   Information Technology 27.0   Financials 24.2   Materials 6.7   Consumer Staples 3.2   Consumer Discretionary 2.7   Utilities 1.8   Communication Services 1.3     Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.1                    Short-Term Investments and Net Other Assets (Liabilities) - (0.1)%   United States 19.8 Japan 15.8 Taiwan 6.9 United Kingdom 6.8 Israel 6.5 Netherlands 5.2 Germany 5.2 India 3.8 Spain 3.8 Others 26.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 19.8                       Japan - 15.8                               Taiwan - 6.9                               United Kingdom - 6.8                       Israel - 6.5                               Netherlands - 5.2                          Germany - 5.2                              India - 3.8                                Spain - 3.8                                Others - 26.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 6.9   ASML Holding NV 3.1   SK Hynix Inc 2.5   ASM International NV 2.1   Schneider Electric SE 2.1   Hitachi Ltd 2.1   Siemens Energy AG 2.1   Rolls-Royce Holdings PLC 2.1   Next Vision Stabilized Systems Ltd 2.0   Celestica Inc (United States) 2.0     27.0  
Fidelity Advisor International Capital Appreciation Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® International Capital Appreciation Fund
Class Name Fidelity Advisor® International Capital Appreciation Fund Class M
Trading Symbol FIATX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® International Capital Appreciation Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class M 
$ 63 
1.23%
  
Expenses Paid, Amount $ 63
Expense Ratio, Percent 1.23%
Net Assets $ 16,250,767,968
Holdings Count | shares 64
Investment Company Portfolio Turnover 135.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$16,250,767,968
  
Number of Holdings
64
  
Portfolio Turnover
135%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Industrials 33.2   Information Technology 27.0   Financials 24.2   Materials 6.7   Consumer Staples 3.2   Consumer Discretionary 2.7   Utilities 1.8   Communication Services 1.3     Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.1                    Short-Term Investments and Net Other Assets (Liabilities) - (0.1)%   United States 19.8 Japan 15.8 Taiwan 6.9 United Kingdom 6.8 Israel 6.5 Netherlands 5.2 Germany 5.2 India 3.8 Spain 3.8 Others 26.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 19.8                       Japan - 15.8                               Taiwan - 6.9                               United Kingdom - 6.8                       Israel - 6.5                               Netherlands - 5.2                          Germany - 5.2                              India - 3.8                                Spain - 3.8                                Others - 26.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 6.9   ASML Holding NV 3.1   SK Hynix Inc 2.5   ASM International NV 2.1   Schneider Electric SE 2.1   Hitachi Ltd 2.1   Siemens Energy AG 2.1   Rolls-Royce Holdings PLC 2.1   Next Vision Stabilized Systems Ltd 2.0   Celestica Inc (United States) 2.0     27.0  
Fidelity Advisor International Capital Appreciation Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® International Capital Appreciation Fund
Class Name Fidelity Advisor® International Capital Appreciation Fund Class I
Trading Symbol FCPIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® International Capital Appreciation Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class I 
$ 37 
0.73%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.73%
Net Assets $ 16,250,767,968
Holdings Count | shares 64
Investment Company Portfolio Turnover 135.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$16,250,767,968
  
Number of Holdings
64
  
Portfolio Turnover
135%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Industrials 33.2   Information Technology 27.0   Financials 24.2   Materials 6.7   Consumer Staples 3.2   Consumer Discretionary 2.7   Utilities 1.8   Communication Services 1.3     Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.1                    Short-Term Investments and Net Other Assets (Liabilities) - (0.1)%   United States 19.8 Japan 15.8 Taiwan 6.9 United Kingdom 6.8 Israel 6.5 Netherlands 5.2 Germany 5.2 India 3.8 Spain 3.8 Others 26.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 19.8                       Japan - 15.8                               Taiwan - 6.9                               United Kingdom - 6.8                       Israel - 6.5                               Netherlands - 5.2                          Germany - 5.2                              India - 3.8                                Spain - 3.8                                Others - 26.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 6.9   ASML Holding NV 3.1   SK Hynix Inc 2.5   ASM International NV 2.1   Schneider Electric SE 2.1   Hitachi Ltd 2.1   Siemens Energy AG 2.1   Rolls-Royce Holdings PLC 2.1   Next Vision Stabilized Systems Ltd 2.0   Celestica Inc (United States) 2.0     27.0  
Fidelity Advisor International Capital Appreciation Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® International Capital Appreciation Fund
Class Name Fidelity Advisor® International Capital Appreciation Fund Class C
Trading Symbol FCPCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® International Capital Appreciation Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class C 
$ 88 
1.73%
  
Expenses Paid, Amount $ 88
Expense Ratio, Percent 1.73%
Net Assets $ 16,250,767,968
Holdings Count | shares 64
Investment Company Portfolio Turnover 135.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$16,250,767,968
  
Number of Holdings
64
  
Portfolio Turnover
135%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Industrials 33.2   Information Technology 27.0   Financials 24.2   Materials 6.7   Consumer Staples 3.2   Consumer Discretionary 2.7   Utilities 1.8   Communication Services 1.3     Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.1                    Short-Term Investments and Net Other Assets (Liabilities) - (0.1)%   United States 19.8 Japan 15.8 Taiwan 6.9 United Kingdom 6.8 Israel 6.5 Netherlands 5.2 Germany 5.2 India 3.8 Spain 3.8 Others 26.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 19.8                       Japan - 15.8                               Taiwan - 6.9                               United Kingdom - 6.8                       Israel - 6.5                               Netherlands - 5.2                          Germany - 5.2                              India - 3.8                                Spain - 3.8                                Others - 26.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 6.9   ASML Holding NV 3.1   SK Hynix Inc 2.5   ASM International NV 2.1   Schneider Electric SE 2.1   Hitachi Ltd 2.1   Siemens Energy AG 2.1   Rolls-Royce Holdings PLC 2.1   Next Vision Stabilized Systems Ltd 2.0   Celestica Inc (United States) 2.0     27.0  
Fidelity Advisor International Capital Appreciation Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® International Capital Appreciation Fund
Class Name Fidelity Advisor® International Capital Appreciation Fund Class A
Trading Symbol FCPAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® International Capital Appreciation Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class A 
$ 50 
0.98%
  
Expenses Paid, Amount $ 50
Expense Ratio, Percent 0.98%
Net Assets $ 16,250,767,968
Holdings Count | shares 64
Investment Company Portfolio Turnover 135.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$16,250,767,968
  
Number of Holdings
64
  
Portfolio Turnover
135%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Industrials 33.2   Information Technology 27.0   Financials 24.2   Materials 6.7   Consumer Staples 3.2   Consumer Discretionary 2.7   Utilities 1.8   Communication Services 1.3     Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.1                    Short-Term Investments and Net Other Assets (Liabilities) - (0.1)%   United States 19.8 Japan 15.8 Taiwan 6.9 United Kingdom 6.8 Israel 6.5 Netherlands 5.2 Germany 5.2 India 3.8 Spain 3.8 Others 26.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 19.8                       Japan - 15.8                               Taiwan - 6.9                               United Kingdom - 6.8                       Israel - 6.5                               Netherlands - 5.2                          Germany - 5.2                              India - 3.8                                Spain - 3.8                                Others - 26.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 6.9   ASML Holding NV 3.1   SK Hynix Inc 2.5   ASM International NV 2.1   Schneider Electric SE 2.1   Hitachi Ltd 2.1   Siemens Energy AG 2.1   Rolls-Royce Holdings PLC 2.1   Next Vision Stabilized Systems Ltd 2.0   Celestica Inc (United States) 2.0     27.0  
Fidelity Advisor Global Capital Appreciation Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Global Capital Appreciation Fund
Class Name Fidelity Advisor® Global Capital Appreciation Fund Class M
Trading Symbol FGETX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Global Capital Appreciation Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class M 
$ 79 
1.55%
  
Expenses Paid, Amount $ 79
Expense Ratio, Percent 1.55%
Net Assets $ 176,426,894
Holdings Count | shares 62
Investment Company Portfolio Turnover 86.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$176,426,894
  
Number of Holdings
62
  
Portfolio Turnover
86%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 36.3   Industrials 16.6   Financials 15.1   Communication Services 8.8   Consumer Discretionary 6.7   Health Care 5.0   Energy 4.7   Materials 1.7   Consumer Staples 1.3     Common Stocks 95.8 Preferred Stocks 0.4 Short-Term Investments and Net Other Assets (Liabilities) 3.8 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 95.8                       Preferred Stocks - 0.4                     Short-Term Investments and Net Other Assets (Liabilities) - 3.8   United States 67.5 Taiwan 4.7 Korea (South) 4.4 Japan 4.4 China 3.5 United Kingdom 2.9 Germany 2.4 Spain 2.1 Canada 1.6 Others 6.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 67.5                       Taiwan - 4.7                               Korea (South) - 4.4                        Japan - 4.4                                China - 3.5                                United Kingdom - 2.9                       Germany - 2.4                              Spain - 2.1                                Canada - 1.6                               Others - 6.5                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 7.2   Alphabet Inc Class A 5.1   Taiwan Semiconductor Manufacturing Co Ltd ADR 4.7   SK Hynix Inc 4.4   Amazon.com Inc 3.7   Amphenol Corp Class A 2.9   Westinghouse Air Brake Technologies Corp 2.4   Seagate Technology Holdings PLC 2.3   Broadcom Inc 2.3   EMCOR Group Inc 2.2     37.2  
Fidelity Advisor Global Capital Appreciation Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Global Capital Appreciation Fund
Class Name Fidelity Advisor® Global Capital Appreciation Fund Class I
Trading Symbol FEUIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Global Capital Appreciation Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class I 
$ 54 
1.05%
  
Expenses Paid, Amount $ 54
Expense Ratio, Percent 1.05%
Net Assets $ 176,426,894
Holdings Count | shares 62
Investment Company Portfolio Turnover 86.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$176,426,894
  
Number of Holdings
62
  
Portfolio Turnover
86%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 36.3   Industrials 16.6   Financials 15.1   Communication Services 8.8   Consumer Discretionary 6.7   Health Care 5.0   Energy 4.7   Materials 1.7   Consumer Staples 1.3     Common Stocks 95.8 Preferred Stocks 0.4 Short-Term Investments and Net Other Assets (Liabilities) 3.8 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 95.8                       Preferred Stocks - 0.4                     Short-Term Investments and Net Other Assets (Liabilities) - 3.8   United States 67.5 Taiwan 4.7 Korea (South) 4.4 Japan 4.4 China 3.5 United Kingdom 2.9 Germany 2.4 Spain 2.1 Canada 1.6 Others 6.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 67.5                       Taiwan - 4.7                               Korea (South) - 4.4                        Japan - 4.4                                China - 3.5                                United Kingdom - 2.9                       Germany - 2.4                              Spain - 2.1                                Canada - 1.6                               Others - 6.5                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 7.2   Alphabet Inc Class A 5.1   Taiwan Semiconductor Manufacturing Co Ltd ADR 4.7   SK Hynix Inc 4.4   Amazon.com Inc 3.7   Amphenol Corp Class A 2.9   Westinghouse Air Brake Technologies Corp 2.4   Seagate Technology Holdings PLC 2.3   Broadcom Inc 2.3   EMCOR Group Inc 2.2     37.2  
Fidelity Advisor Global Capital Appreciation Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Global Capital Appreciation Fund
Class Name Fidelity Advisor® Global Capital Appreciation Fund Class C
Trading Symbol FEUCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Global Capital Appreciation Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class C 
$ 105 
2.05%
  
Expenses Paid, Amount $ 105
Expense Ratio, Percent 2.05%
Net Assets $ 176,426,894
Holdings Count | shares 62
Investment Company Portfolio Turnover 86.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$176,426,894
  
Number of Holdings
62
  
Portfolio Turnover
86%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 36.3   Industrials 16.6   Financials 15.1   Communication Services 8.8   Consumer Discretionary 6.7   Health Care 5.0   Energy 4.7   Materials 1.7   Consumer Staples 1.3     Common Stocks 95.8 Preferred Stocks 0.4 Short-Term Investments and Net Other Assets (Liabilities) 3.8 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 95.8                       Preferred Stocks - 0.4                     Short-Term Investments and Net Other Assets (Liabilities) - 3.8   United States 67.5 Taiwan 4.7 Korea (South) 4.4 Japan 4.4 China 3.5 United Kingdom 2.9 Germany 2.4 Spain 2.1 Canada 1.6 Others 6.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 67.5                       Taiwan - 4.7                               Korea (South) - 4.4                        Japan - 4.4                                China - 3.5                                United Kingdom - 2.9                       Germany - 2.4                              Spain - 2.1                                Canada - 1.6                               Others - 6.5                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 7.2   Alphabet Inc Class A 5.1   Taiwan Semiconductor Manufacturing Co Ltd ADR 4.7   SK Hynix Inc 4.4   Amazon.com Inc 3.7   Amphenol Corp Class A 2.9   Westinghouse Air Brake Technologies Corp 2.4   Seagate Technology Holdings PLC 2.3   Broadcom Inc 2.3   EMCOR Group Inc 2.2     37.2  
Fidelity Advisor Global Capital Appreciation Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Global Capital Appreciation Fund
Class Name Fidelity Advisor® Global Capital Appreciation Fund Class A
Trading Symbol FGEAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Global Capital Appreciation Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class A 
$ 67 
1.30%
  
Expenses Paid, Amount $ 67
Expense Ratio, Percent 1.30%
Net Assets $ 176,426,894
Holdings Count | shares 62
Investment Company Portfolio Turnover 86.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$176,426,894
  
Number of Holdings
62
  
Portfolio Turnover
86%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 36.3   Industrials 16.6   Financials 15.1   Communication Services 8.8   Consumer Discretionary 6.7   Health Care 5.0   Energy 4.7   Materials 1.7   Consumer Staples 1.3     Common Stocks 95.8 Preferred Stocks 0.4 Short-Term Investments and Net Other Assets (Liabilities) 3.8 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 95.8                       Preferred Stocks - 0.4                     Short-Term Investments and Net Other Assets (Liabilities) - 3.8   United States 67.5 Taiwan 4.7 Korea (South) 4.4 Japan 4.4 China 3.5 United Kingdom 2.9 Germany 2.4 Spain 2.1 Canada 1.6 Others 6.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 67.5                       Taiwan - 4.7                               Korea (South) - 4.4                        Japan - 4.4                                China - 3.5                                United Kingdom - 2.9                       Germany - 2.4                              Spain - 2.1                                Canada - 1.6                               Others - 6.5                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 7.2   Alphabet Inc Class A 5.1   Taiwan Semiconductor Manufacturing Co Ltd ADR 4.7   SK Hynix Inc 4.4   Amazon.com Inc 3.7   Amphenol Corp Class A 2.9   Westinghouse Air Brake Technologies Corp 2.4   Seagate Technology Holdings PLC 2.3   Broadcom Inc 2.3   EMCOR Group Inc 2.2     37.2  
Fidelity Advisor Focused Emerging Markets Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Focused Emerging Markets Fund
Class Name Fidelity Advisor® Focused Emerging Markets Fund Class Z
Trading Symbol FZAEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Focused Emerging Markets Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class Z 
$ 43 
0.78%
  
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.78%
Net Assets $ 12,475,458,273
Holdings Count | shares 62
Investment Company Portfolio Turnover 54.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$12,475,458,273
  
Number of Holdings
62
  
Portfolio Turnover
54%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 31.2   Financials 21.4   Industrials 12.2   Communication Services 8.6   Materials 7.7   Consumer Discretionary 6.4   Energy 5.1   Health Care 3.5   Consumer Staples 2.1     Common Stocks 98.2 Short-Term Investments and Net Other Assets (Liabilities) 1.8 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.2                       Short-Term Investments and Net Other Assets (Liabilities) - 1.8   China 24.0 Taiwan 22.2 Korea (South) 11.7 India 7.1 Mexico 4.8 South Africa 3.3 Hungary 3.1 United States 3.0 Saudi Arabia 2.8 Others 18.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     China - 24.0                               Taiwan - 22.2                              Korea (South) - 11.7                       India - 7.1                                Mexico - 4.8                               South Africa - 3.3                         Hungary - 3.1                              United States - 3.0                        Saudi Arabia - 2.8                         Others - 18.0                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 10.3   Samsung Electronics Co Ltd 9.2   Tencent Holdings Ltd 5.0   MediaTek Inc 4.1   Delta Electronics Inc 2.8   Larsen & Toubro Ltd 2.2   China Construction Bank Corp H Shares 2.1   America Movil SAB de CV ADR 2.1   Yageo Corp 2.0   Credicorp Ltd 2.0     41.8  
Fidelity Advisor Focused Emerging Markets Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Focused Emerging Markets Fund
Class Name Fidelity Advisor® Focused Emerging Markets Fund Class M
Trading Symbol FTMKX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Focused Emerging Markets Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class M 
$ 76 
1.40%
  
Expenses Paid, Amount $ 76
Expense Ratio, Percent 1.40%
Net Assets $ 12,475,458,273
Holdings Count | shares 62
Investment Company Portfolio Turnover 54.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$12,475,458,273
  
Number of Holdings
62
  
Portfolio Turnover
54%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 31.2   Financials 21.4   Industrials 12.2   Communication Services 8.6   Materials 7.7   Consumer Discretionary 6.4   Energy 5.1   Health Care 3.5   Consumer Staples 2.1     Common Stocks 98.2 Short-Term Investments and Net Other Assets (Liabilities) 1.8 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.2                       Short-Term Investments and Net Other Assets (Liabilities) - 1.8   China 24.0 Taiwan 22.2 Korea (South) 11.7 India 7.1 Mexico 4.8 South Africa 3.3 Hungary 3.1 United States 3.0 Saudi Arabia 2.8 Others 18.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     China - 24.0                               Taiwan - 22.2                              Korea (South) - 11.7                       India - 7.1                                Mexico - 4.8                               South Africa - 3.3                         Hungary - 3.1                              United States - 3.0                        Saudi Arabia - 2.8                         Others - 18.0                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 10.3   Samsung Electronics Co Ltd 9.2   Tencent Holdings Ltd 5.0   MediaTek Inc 4.1   Delta Electronics Inc 2.8   Larsen & Toubro Ltd 2.2   China Construction Bank Corp H Shares 2.1   America Movil SAB de CV ADR 2.1   Yageo Corp 2.0   Credicorp Ltd 2.0     41.8  
Fidelity Advisor Focused Emerging Markets Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Focused Emerging Markets Fund
Class Name Fidelity Advisor® Focused Emerging Markets Fund Class I
Trading Symbol FIMKX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Focused Emerging Markets Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class I 
$ 49 
0.90%
  
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.90%
Net Assets $ 12,475,458,273
Holdings Count | shares 62
Investment Company Portfolio Turnover 54.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$12,475,458,273
  
Number of Holdings
62
  
Portfolio Turnover
54%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 31.2   Financials 21.4   Industrials 12.2   Communication Services 8.6   Materials 7.7   Consumer Discretionary 6.4   Energy 5.1   Health Care 3.5   Consumer Staples 2.1     Common Stocks 98.2 Short-Term Investments and Net Other Assets (Liabilities) 1.8 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.2                       Short-Term Investments and Net Other Assets (Liabilities) - 1.8   China 24.0 Taiwan 22.2 Korea (South) 11.7 India 7.1 Mexico 4.8 South Africa 3.3 Hungary 3.1 United States 3.0 Saudi Arabia 2.8 Others 18.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     China - 24.0                               Taiwan - 22.2                              Korea (South) - 11.7                       India - 7.1                                Mexico - 4.8                               South Africa - 3.3                         Hungary - 3.1                              United States - 3.0                        Saudi Arabia - 2.8                         Others - 18.0                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 10.3   Samsung Electronics Co Ltd 9.2   Tencent Holdings Ltd 5.0   MediaTek Inc 4.1   Delta Electronics Inc 2.8   Larsen & Toubro Ltd 2.2   China Construction Bank Corp H Shares 2.1   America Movil SAB de CV ADR 2.1   Yageo Corp 2.0   Credicorp Ltd 2.0     41.8  
Fidelity Advisor Focused Emerging Markets Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Focused Emerging Markets Fund
Class Name Fidelity Advisor® Focused Emerging Markets Fund Class C
Trading Symbol FMCKX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Focused Emerging Markets Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class C 
$ 103 
1.90%
  
Expenses Paid, Amount $ 103
Expense Ratio, Percent 1.90%
Net Assets $ 12,475,458,273
Holdings Count | shares 62
Investment Company Portfolio Turnover 54.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$12,475,458,273
  
Number of Holdings
62
  
Portfolio Turnover
54%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 31.2   Financials 21.4   Industrials 12.2   Communication Services 8.6   Materials 7.7   Consumer Discretionary 6.4   Energy 5.1   Health Care 3.5   Consumer Staples 2.1     Common Stocks 98.2 Short-Term Investments and Net Other Assets (Liabilities) 1.8 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.2                       Short-Term Investments and Net Other Assets (Liabilities) - 1.8   China 24.0 Taiwan 22.2 Korea (South) 11.7 India 7.1 Mexico 4.8 South Africa 3.3 Hungary 3.1 United States 3.0 Saudi Arabia 2.8 Others 18.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     China - 24.0                               Taiwan - 22.2                              Korea (South) - 11.7                       India - 7.1                                Mexico - 4.8                               South Africa - 3.3                         Hungary - 3.1                              United States - 3.0                        Saudi Arabia - 2.8                         Others - 18.0                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 10.3   Samsung Electronics Co Ltd 9.2   Tencent Holdings Ltd 5.0   MediaTek Inc 4.1   Delta Electronics Inc 2.8   Larsen & Toubro Ltd 2.2   China Construction Bank Corp H Shares 2.1   America Movil SAB de CV ADR 2.1   Yageo Corp 2.0   Credicorp Ltd 2.0     41.8  
Fidelity Advisor Focused Emerging Markets Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Focused Emerging Markets Fund
Class Name Fidelity Advisor® Focused Emerging Markets Fund Class A
Trading Symbol FAMKX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Focused Emerging Markets Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class A 
$ 62 
1.15%
  
Expenses Paid, Amount $ 62
Expense Ratio, Percent 1.15%
Net Assets $ 12,475,458,273
Holdings Count | shares 62
Investment Company Portfolio Turnover 54.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$12,475,458,273
  
Number of Holdings
62
  
Portfolio Turnover
54%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 31.2   Financials 21.4   Industrials 12.2   Communication Services 8.6   Materials 7.7   Consumer Discretionary 6.4   Energy 5.1   Health Care 3.5   Consumer Staples 2.1     Common Stocks 98.2 Short-Term Investments and Net Other Assets (Liabilities) 1.8 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 98.2                       Short-Term Investments and Net Other Assets (Liabilities) - 1.8   China 24.0 Taiwan 22.2 Korea (South) 11.7 India 7.1 Mexico 4.8 South Africa 3.3 Hungary 3.1 United States 3.0 Saudi Arabia 2.8 Others 18.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     China - 24.0                               Taiwan - 22.2                              Korea (South) - 11.7                       India - 7.1                                Mexico - 4.8                               South Africa - 3.3                         Hungary - 3.1                              United States - 3.0                        Saudi Arabia - 2.8                         Others - 18.0                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 10.3   Samsung Electronics Co Ltd 9.2   Tencent Holdings Ltd 5.0   MediaTek Inc 4.1   Delta Electronics Inc 2.8   Larsen & Toubro Ltd 2.2   China Construction Bank Corp H Shares 2.1   America Movil SAB de CV ADR 2.1   Yageo Corp 2.0   Credicorp Ltd 2.0     41.8  
Fidelity Advisor Emerging Asia Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Emerging Asia Fund
Class Name Fidelity Advisor® Emerging Asia Fund Class Z
Trading Symbol FIQPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Emerging Asia Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class Z 
$ 43 
0.79%
  
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.79%
Net Assets $ 718,365,445
Holdings Count | shares 72
Investment Company Portfolio Turnover 103.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$718,365,445
  
Number of Holdings
72
  
Portfolio Turnover
103%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 42.8   Industrials 16.3   Financials 12.5   Consumer Discretionary 8.1   Communication Services 6.2   Materials 5.0   Health Care 3.2   Consumer Staples 1.9   Energy 1.8     Common Stocks 92.8 Preferred Stocks 5.0 Short-Term Investments and Net Other Assets (Liabilities) 2.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 92.8                       Preferred Stocks - 5.0                     Short-Term Investments and Net Other Assets (Liabilities) - 2.2   China 31.7 Taiwan 30.2 Korea (South) 21.2 India 7.0 Singapore 3.3 United States 2.6 Hong Kong 1.6 Indonesia 1.3 Philippines 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     China - 31.7                               Taiwan - 30.2                              Korea (South) - 21.2                       India - 7.0                                Singapore - 3.3                            United States - 2.6                        Hong Kong - 1.6                            Indonesia - 1.3                            Philippines - 1.1                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 17.0   Tencent Holdings Ltd 4.6   Samsung Electronics Co Ltd non-voting shares 4.4   SK Square Co Ltd 4.0   MediaTek Inc 2.7   Samsung Electronics Co Ltd 2.7   Delta Electronics Inc 2.5   Contemporary Amperex Technology Co Ltd A Shares (China) 2.1   Ping An Insurance Group Co of China Ltd H Shares 2.0   LS Electric Co Ltd 1.8     43.8  
Fidelity Advisor Emerging Asia Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Emerging Asia Fund
Class Name Fidelity Advisor® Emerging Asia Fund Class M
Trading Symbol FEATX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Emerging Asia Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class M 
$ 79 
1.45%
  
Expenses Paid, Amount $ 79
Expense Ratio, Percent 1.45%
Net Assets $ 718,365,445
Holdings Count | shares 72
Investment Company Portfolio Turnover 103.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$718,365,445
  
Number of Holdings
72
  
Portfolio Turnover
103%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 42.8   Industrials 16.3   Financials 12.5   Consumer Discretionary 8.1   Communication Services 6.2   Materials 5.0   Health Care 3.2   Consumer Staples 1.9   Energy 1.8     Common Stocks 92.8 Preferred Stocks 5.0 Short-Term Investments and Net Other Assets (Liabilities) 2.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 92.8                       Preferred Stocks - 5.0                     Short-Term Investments and Net Other Assets (Liabilities) - 2.2   China 31.7 Taiwan 30.2 Korea (South) 21.2 India 7.0 Singapore 3.3 United States 2.6 Hong Kong 1.6 Indonesia 1.3 Philippines 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     China - 31.7                               Taiwan - 30.2                              Korea (South) - 21.2                       India - 7.0                                Singapore - 3.3                            United States - 2.6                        Hong Kong - 1.6                            Indonesia - 1.3                            Philippines - 1.1                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 17.0   Tencent Holdings Ltd 4.6   Samsung Electronics Co Ltd non-voting shares 4.4   SK Square Co Ltd 4.0   MediaTek Inc 2.7   Samsung Electronics Co Ltd 2.7   Delta Electronics Inc 2.5   Contemporary Amperex Technology Co Ltd A Shares (China) 2.1   Ping An Insurance Group Co of China Ltd H Shares 2.0   LS Electric Co Ltd 1.8     43.8  
Fidelity Advisor Emerging Asia Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Emerging Asia Fund
Class Name Fidelity Advisor® Emerging Asia Fund Class I
Trading Symbol FERIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Emerging Asia Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class I 
$ 51 
0.93%
  
Expenses Paid, Amount $ 51
Expense Ratio, Percent 0.93%
Net Assets $ 718,365,445
Holdings Count | shares 72
Investment Company Portfolio Turnover 103.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$718,365,445
  
Number of Holdings
72
  
Portfolio Turnover
103%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 42.8   Industrials 16.3   Financials 12.5   Consumer Discretionary 8.1   Communication Services 6.2   Materials 5.0   Health Care 3.2   Consumer Staples 1.9   Energy 1.8     Common Stocks 92.8 Preferred Stocks 5.0 Short-Term Investments and Net Other Assets (Liabilities) 2.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 92.8                       Preferred Stocks - 5.0                     Short-Term Investments and Net Other Assets (Liabilities) - 2.2   China 31.7 Taiwan 30.2 Korea (South) 21.2 India 7.0 Singapore 3.3 United States 2.6 Hong Kong 1.6 Indonesia 1.3 Philippines 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     China - 31.7                               Taiwan - 30.2                              Korea (South) - 21.2                       India - 7.0                                Singapore - 3.3                            United States - 2.6                        Hong Kong - 1.6                            Indonesia - 1.3                            Philippines - 1.1                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 17.0   Tencent Holdings Ltd 4.6   Samsung Electronics Co Ltd non-voting shares 4.4   SK Square Co Ltd 4.0   MediaTek Inc 2.7   Samsung Electronics Co Ltd 2.7   Delta Electronics Inc 2.5   Contemporary Amperex Technology Co Ltd A Shares (China) 2.1   Ping An Insurance Group Co of China Ltd H Shares 2.0   LS Electric Co Ltd 1.8     43.8  
Fidelity Advisor Emerging Asia Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Emerging Asia Fund
Class Name Fidelity Advisor® Emerging Asia Fund Class C
Trading Symbol FERCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Emerging Asia Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class C 
$ 106 
1.94%
  
Expenses Paid, Amount $ 106
Expense Ratio, Percent 1.94%
Net Assets $ 718,365,445
Holdings Count | shares 72
Investment Company Portfolio Turnover 103.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$718,365,445
  
Number of Holdings
72
  
Portfolio Turnover
103%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 42.8   Industrials 16.3   Financials 12.5   Consumer Discretionary 8.1   Communication Services 6.2   Materials 5.0   Health Care 3.2   Consumer Staples 1.9   Energy 1.8     Common Stocks 92.8 Preferred Stocks 5.0 Short-Term Investments and Net Other Assets (Liabilities) 2.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 92.8                       Preferred Stocks - 5.0                     Short-Term Investments and Net Other Assets (Liabilities) - 2.2   China 31.7 Taiwan 30.2 Korea (South) 21.2 India 7.0 Singapore 3.3 United States 2.6 Hong Kong 1.6 Indonesia 1.3 Philippines 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     China - 31.7                               Taiwan - 30.2                              Korea (South) - 21.2                       India - 7.0                                Singapore - 3.3                            United States - 2.6                        Hong Kong - 1.6                            Indonesia - 1.3                            Philippines - 1.1                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 17.0   Tencent Holdings Ltd 4.6   Samsung Electronics Co Ltd non-voting shares 4.4   SK Square Co Ltd 4.0   MediaTek Inc 2.7   Samsung Electronics Co Ltd 2.7   Delta Electronics Inc 2.5   Contemporary Amperex Technology Co Ltd A Shares (China) 2.1   Ping An Insurance Group Co of China Ltd H Shares 2.0   LS Electric Co Ltd 1.8     43.8  
Fidelity Advisor Emerging Asia Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Emerging Asia Fund
Class Name Fidelity Advisor® Emerging Asia Fund Class A
Trading Symbol FEAAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Emerging Asia Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class A 
$ 66 
1.20%
  
Expenses Paid, Amount $ 66
Expense Ratio, Percent 1.20%
Net Assets $ 718,365,445
Holdings Count | shares 72
Investment Company Portfolio Turnover 103.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$718,365,445
  
Number of Holdings
72
  
Portfolio Turnover
103%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 42.8   Industrials 16.3   Financials 12.5   Consumer Discretionary 8.1   Communication Services 6.2   Materials 5.0   Health Care 3.2   Consumer Staples 1.9   Energy 1.8     Common Stocks 92.8 Preferred Stocks 5.0 Short-Term Investments and Net Other Assets (Liabilities) 2.2 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 92.8                       Preferred Stocks - 5.0                     Short-Term Investments and Net Other Assets (Liabilities) - 2.2   China 31.7 Taiwan 30.2 Korea (South) 21.2 India 7.0 Singapore 3.3 United States 2.6 Hong Kong 1.6 Indonesia 1.3 Philippines 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     China - 31.7                               Taiwan - 30.2                              Korea (South) - 21.2                       India - 7.0                                Singapore - 3.3                            United States - 2.6                        Hong Kong - 1.6                            Indonesia - 1.3                            Philippines - 1.1                             
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 17.0   Tencent Holdings Ltd 4.6   Samsung Electronics Co Ltd non-voting shares 4.4   SK Square Co Ltd 4.0   MediaTek Inc 2.7   Samsung Electronics Co Ltd 2.7   Delta Electronics Inc 2.5   Contemporary Amperex Technology Co Ltd A Shares (China) 2.1   Ping An Insurance Group Co of China Ltd H Shares 2.0   LS Electric Co Ltd 1.8     43.8  
Fidelity Advisor Diversified International Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Diversified International Fund
Class Name Fidelity Advisor® Diversified International Fund Class Z
Trading Symbol FZABX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Diversified International Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class Z 
$ 37 
0.72%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.72%
Net Assets $ 1,724,046,590
Holdings Count | shares 152
Investment Company Portfolio Turnover 49.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,724,046,590
  
Number of Holdings
152
  
Portfolio Turnover
49%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Financials 26.1   Industrials 23.6   Information Technology 15.6   Health Care 7.9   Materials 7.6   Consumer Discretionary 6.7   Energy 4.2   Consumer Staples 3.1   Utilities 2.2   Communication Services 0.7     Common Stocks 96.9 Preferred Stocks 0.8 Short-Term Investments and Net Other Assets (Liabilities) 2.3 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 96.9                       Preferred Stocks - 0.8                     Short-Term Investments and Net Other Assets (Liabilities) - 2.3   Japan 20.2 United Kingdom 15.1 United States 10.6 Germany 8.8 Spain 5.0 France 4.9 Italy 4.4 Netherlands 4.2 Canada 3.9 Others 22.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Japan - 20.2                               United Kingdom - 15.1                      United States - 10.6                       Germany - 8.8                              Spain - 5.0                                France - 4.9                               Italy - 4.4                                Netherlands - 4.2                          Canada - 3.9                               Others - 22.9                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     ASML Holding NV depository receipt 3.3   Banco Santander SA 2.5   Taiwan Semiconductor Manufacturing Co Ltd ADR 2.4   Rolls-Royce Holdings PLC 2.1   Shell PLC 1.9   Siemens Energy AG 1.9   Schneider Electric SE 1.9   Lloyds Banking Group PLC 1.8   SK Hynix Inc 1.8   CaixaBank SA 1.7     21.3  
Fidelity Advisor Diversified International Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Diversified International Fund
Class Name Fidelity Advisor® Diversified International Fund Class M
Trading Symbol FADIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Diversified International Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class M 
$ 70 
1.34%
  
Expenses Paid, Amount $ 70
Expense Ratio, Percent 1.34%
Net Assets $ 1,724,046,590
Holdings Count | shares 152
Investment Company Portfolio Turnover 49.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,724,046,590
  
Number of Holdings
152
  
Portfolio Turnover
49%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Financials 26.1   Industrials 23.6   Information Technology 15.6   Health Care 7.9   Materials 7.6   Consumer Discretionary 6.7   Energy 4.2   Consumer Staples 3.1   Utilities 2.2   Communication Services 0.7     Common Stocks 96.9 Preferred Stocks 0.8 Short-Term Investments and Net Other Assets (Liabilities) 2.3 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 96.9                       Preferred Stocks - 0.8                     Short-Term Investments and Net Other Assets (Liabilities) - 2.3   Japan 20.2 United Kingdom 15.1 United States 10.6 Germany 8.8 Spain 5.0 France 4.9 Italy 4.4 Netherlands 4.2 Canada 3.9 Others 22.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Japan - 20.2                               United Kingdom - 15.1                      United States - 10.6                       Germany - 8.8                              Spain - 5.0                                France - 4.9                               Italy - 4.4                                Netherlands - 4.2                          Canada - 3.9                               Others - 22.9                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     ASML Holding NV depository receipt 3.3   Banco Santander SA 2.5   Taiwan Semiconductor Manufacturing Co Ltd ADR 2.4   Rolls-Royce Holdings PLC 2.1   Shell PLC 1.9   Siemens Energy AG 1.9   Schneider Electric SE 1.9   Lloyds Banking Group PLC 1.8   SK Hynix Inc 1.8   CaixaBank SA 1.7     21.3  
Fidelity Advisor Diversified International Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Diversified International Fund
Class Name Fidelity Advisor® Diversified International Fund Class I
Trading Symbol FDVIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Diversified International Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class I 
$ 44 
0.84%
  
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.84%
Net Assets $ 1,724,046,590
Holdings Count | shares 152
Investment Company Portfolio Turnover 49.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,724,046,590
  
Number of Holdings
152
  
Portfolio Turnover
49%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Financials 26.1   Industrials 23.6   Information Technology 15.6   Health Care 7.9   Materials 7.6   Consumer Discretionary 6.7   Energy 4.2   Consumer Staples 3.1   Utilities 2.2   Communication Services 0.7     Common Stocks 96.9 Preferred Stocks 0.8 Short-Term Investments and Net Other Assets (Liabilities) 2.3 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 96.9                       Preferred Stocks - 0.8                     Short-Term Investments and Net Other Assets (Liabilities) - 2.3   Japan 20.2 United Kingdom 15.1 United States 10.6 Germany 8.8 Spain 5.0 France 4.9 Italy 4.4 Netherlands 4.2 Canada 3.9 Others 22.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Japan - 20.2                               United Kingdom - 15.1                      United States - 10.6                       Germany - 8.8                              Spain - 5.0                                France - 4.9                               Italy - 4.4                                Netherlands - 4.2                          Canada - 3.9                               Others - 22.9                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     ASML Holding NV depository receipt 3.3   Banco Santander SA 2.5   Taiwan Semiconductor Manufacturing Co Ltd ADR 2.4   Rolls-Royce Holdings PLC 2.1   Shell PLC 1.9   Siemens Energy AG 1.9   Schneider Electric SE 1.9   Lloyds Banking Group PLC 1.8   SK Hynix Inc 1.8   CaixaBank SA 1.7     21.3  
Fidelity Advisor Diversified International Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Diversified International Fund
Class Name Fidelity Advisor® Diversified International Fund Class C
Trading Symbol FADCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Diversified International Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class C 
$ 96 
1.84%
  
Expenses Paid, Amount $ 96
Expense Ratio, Percent 1.84%
Net Assets $ 1,724,046,590
Holdings Count | shares 152
Investment Company Portfolio Turnover 49.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,724,046,590
  
Number of Holdings
152
  
Portfolio Turnover
49%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Financials 26.1   Industrials 23.6   Information Technology 15.6   Health Care 7.9   Materials 7.6   Consumer Discretionary 6.7   Energy 4.2   Consumer Staples 3.1   Utilities 2.2   Communication Services 0.7     Common Stocks 96.9 Preferred Stocks 0.8 Short-Term Investments and Net Other Assets (Liabilities) 2.3 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 96.9                       Preferred Stocks - 0.8                     Short-Term Investments and Net Other Assets (Liabilities) - 2.3   Japan 20.2 United Kingdom 15.1 United States 10.6 Germany 8.8 Spain 5.0 France 4.9 Italy 4.4 Netherlands 4.2 Canada 3.9 Others 22.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Japan - 20.2                               United Kingdom - 15.1                      United States - 10.6                       Germany - 8.8                              Spain - 5.0                                France - 4.9                               Italy - 4.4                                Netherlands - 4.2                          Canada - 3.9                               Others - 22.9                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     ASML Holding NV depository receipt 3.3   Banco Santander SA 2.5   Taiwan Semiconductor Manufacturing Co Ltd ADR 2.4   Rolls-Royce Holdings PLC 2.1   Shell PLC 1.9   Siemens Energy AG 1.9   Schneider Electric SE 1.9   Lloyds Banking Group PLC 1.8   SK Hynix Inc 1.8   CaixaBank SA 1.7     21.3  
Fidelity Advisor Diversified International Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Diversified International Fund
Class Name Fidelity Advisor® Diversified International Fund Class A
Trading Symbol FDVAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Diversified International Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class A 
$ 57 
1.09%
  
Expenses Paid, Amount $ 57
Expense Ratio, Percent 1.09%
Net Assets $ 1,724,046,590
Holdings Count | shares 152
Investment Company Portfolio Turnover 49.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,724,046,590
  
Number of Holdings
152
  
Portfolio Turnover
49%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Financials 26.1   Industrials 23.6   Information Technology 15.6   Health Care 7.9   Materials 7.6   Consumer Discretionary 6.7   Energy 4.2   Consumer Staples 3.1   Utilities 2.2   Communication Services 0.7     Common Stocks 96.9 Preferred Stocks 0.8 Short-Term Investments and Net Other Assets (Liabilities) 2.3 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 96.9                       Preferred Stocks - 0.8                     Short-Term Investments and Net Other Assets (Liabilities) - 2.3   Japan 20.2 United Kingdom 15.1 United States 10.6 Germany 8.8 Spain 5.0 France 4.9 Italy 4.4 Netherlands 4.2 Canada 3.9 Others 22.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Japan - 20.2                               United Kingdom - 15.1                      United States - 10.6                       Germany - 8.8                              Spain - 5.0                                France - 4.9                               Italy - 4.4                                Netherlands - 4.2                          Canada - 3.9                               Others - 22.9                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     ASML Holding NV depository receipt 3.3   Banco Santander SA 2.5   Taiwan Semiconductor Manufacturing Co Ltd ADR 2.4   Rolls-Royce Holdings PLC 2.1   Shell PLC 1.9   Siemens Energy AG 1.9   Schneider Electric SE 1.9   Lloyds Banking Group PLC 1.8   SK Hynix Inc 1.8   CaixaBank SA 1.7     21.3  
Fidelity International Capital Appreciation Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® International Capital Appreciation Fund
Class Name Fidelity® International Capital Appreciation Fund
Trading Symbol FICQX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® International Capital Appreciation Fund for the period November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® International Capital Appreciation Fund 
$ 35 
0.69%
  
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.69%
Net Assets $ 16,250,767,968
Holdings Count | shares 64
Investment Company Portfolio Turnover 135.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of April 30, 2026)
 
KEY FACTS 
  
  
Fund Size
$16,250,767,968
  
Number of Holdings
64
  
Portfolio Turnover
135%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Industrials 33.2   Information Technology 27.0   Financials 24.2   Materials 6.7   Consumer Staples 3.2   Consumer Discretionary 2.7   Utilities 1.8   Communication Services 1.3     Common Stocks 100.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 100.1                    Short-Term Investments and Net Other Assets (Liabilities) - (0.1)%   United States 19.8 Japan 15.8 Taiwan 6.9 United Kingdom 6.8 Israel 6.5 Netherlands 5.2 Germany 5.2 India 3.8 Spain 3.8 Others 26.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 19.8                       Japan - 15.8                               Taiwan - 6.9                               United Kingdom - 6.8                       Israel - 6.5                               Netherlands - 5.2                          Germany - 5.2                              India - 3.8                                Spain - 3.8                                Others - 26.2                                 
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Taiwan Semiconductor Manufacturing Co Ltd 6.9   ASML Holding NV 3.1   SK Hynix Inc 2.5   ASM International NV 2.1   Schneider Electric SE 2.1   Hitachi Ltd 2.1   Siemens Energy AG 2.1   Rolls-Royce Holdings PLC 2.1   Next Vision Stabilized Systems Ltd 2.0   Celestica Inc (United States) 2.0     27.0