| **Expense Example, No Redemption - FidelityChinaRegionFund-AMCIZPRO - FidelityChinaRegionFund-AMCIZPRO - Fidelity China Region Fund** | Dec. 30, 2024 USD ($) |
|---------------------------------------------------------------------------------------------------------------------------------------|-----------------------|
| Fidelity Advisor China Region Fund - Class A                                                                                          |                  |
| **Expense Example, No Redemption:**                                                                                                   |                  |
| 1 Year                                                                                                                                | $ 688                 |
| 3 Years                                                                                                                               | 928                   |
| 5 Years                                                                                                                               | 1,187                 |
| 10 Years                                                                                                                              | 1,924                 |
| Fidelity Advisor China Region Fund - Class C                                                                                          |                  |
| **Expense Example, No Redemption:**                                                                                                   |                  |
| 1 Year                                                                                                                                | 196                   |
| 3 Years                                                                                                                               | 606                   |
| 5 Years                                                                                                                               | 1,042                 |
| 10 Years                                                                                                                              | 2,059                 |
| Fidelity Advisor China Region Fund - Class M                                                                                          |                  |
| **Expense Example, No Redemption:**                                                                                                   |                  |
| 1 Year                                                                                                                                | 490                   |
| 3 Years                                                                                                                               | 787                   |
| 5 Years                                                                                                                               | 1,104                 |
| 10 Years                                                                                                                              | 2,003                 |
| Fidelity Advisor China Region Fund - Class I                                                                                          |                  |
| **Expense Example, No Redemption:**                                                                                                   |                  |
| 1 Year                                                                                                                                | 92                    |
| 3 Years                                                                                                                               | 287                   |
| 5 Years                                                                                                                               | 498                   |
| 10 Years                                                                                                                              | 1,108                 |
| Fidelity Advisor China Region Fund - Class Z                                                                                          |                  |
| **Expense Example, No Redemption:**                                                                                                   |                  |
| 1 Year                                                                                                                                | 79                    |
| 3 Years                                                                                                                               | 246                   |
| 5 Years                                                                                                                               | 428                   |
| 10 Years                                                                                                                              | $ 954                 |

| X                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - References
No definition available.
+ Details**Name:**rr_ExpenseExampleNoRedemptionAbstract**Namespace Prefix:**rr_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
You would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form N-1A -Section 3 -Subsection example -Paragraph 2 -Subparagraph 1
+ Details**Name:**rr_ExpenseExampleNoRedemptionYear01**Namespace Prefix:**rr_**Data Type:**rr:NonNegativeMonetaryType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
You would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form N-1A -Section 3 -Subsection example -Paragraph 2 -Subparagraph 1
+ Details**Name:**rr_ExpenseExampleNoRedemptionYear03**Namespace Prefix:**rr_**Data Type:**rr:NonNegativeMonetaryType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
You would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form N-1A -Section 3 -Subsection instructions -Paragraph 4 -Subparagraph f
+ Details**Name:**rr_ExpenseExampleNoRedemptionYear05**Namespace Prefix:**rr_**Data Type:**rr:NonNegativeMonetaryType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
You would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form N-1A -Section 3 -Subsection instructions -Paragraph 4 -Subparagraph f
+ Details**Name:**rr_ExpenseExampleNoRedemptionYear10**Namespace Prefix:**rr_**Data Type:**rr:NonNegativeMonetaryType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**dei_DocumentInformationDocumentAxis=fmr_FidelityChinaRegionFund-AMCIZPROMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**dei_LegalEntityAxis=fmr_S000007108Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**rr_ProspectusShareClassAxis=fmr_C000064261Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**rr_ProspectusShareClassAxis=fmr_C000064263Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**rr_ProspectusShareClassAxis=fmr_C000064264Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**rr_ProspectusShareClassAxis=fmr_C000064265Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**rr_ProspectusShareClassAxis=fmr_C000205033Member**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |