| Form N-CSR Cover | 12 Months Ended |
| Nov. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Fidelity Court Street Trust |
| Entity Central Index Key | 0000225323 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Nov. 30, 2024 |
| Shareholder Report | 12 Months Ended |
| Nov. 30, 2024 USD ($) shares | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Fidelity Court Street Trust |
| Entity Central Index Key | 0000225323 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Nov. 30, 2024 |
| Fidelity New Jersey Municipal Income Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® New Jersey Municipal Income Fund |
| Class Name | Fidelity® New Jersey Municipal Income Fund |
| Trading Symbol | FNJHX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® New Jersey Municipal Income Fund for the period December 1, 2023 to November 30, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® New Jersey Municipal Income Fund $ 0.45 % |
| Expenses Paid, Amount | $ 47 |
| Expense Ratio, Percent | 0.45% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B26"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE November 30, 2014 through November 30, 2024. Initial investment of $10,000. Fidelity® New Jersey Municipal Income Fund $10,000 $10,156 $10,266 $10,927 $11,048 $12,115 $12,634 $13,086 $11,880 $12,504 $13,201 Bloomberg New Jersey Enhanced Modified Municipal Bond Index $10,000 $10,187 $10,302 $11,037 $11,227 $12,295 $12,844 $13,335 $12,185 $12,816 $13,475 Bloomberg Municipal Bond Index $10,000 $10,310 $10,287 $10,862 $10,984 $11,917 $12,500 $12,747 $11,645 $12,144 $12,743 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Fidelity® New Jersey Municipal Income Fund 5.58% 1.73% 2.82% Bloomberg New Jersey Enhanced Modified Municipal Bond Index 5.15% 1.85% 3.03% Bloomberg Municipal Bond Index 4.93% 1.35% 2.45% Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 555,376,587 |
| Holdings Count | shares | 249 |
| Advisory Fees Paid, Amount | $ 2,168,180 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of November 30, 2024) KEY FACTS Fund Size $ Number of Holdings 249 Total Advisory Fee $ Portfolio Turnover 12 % |
| Holdings [Text Block] | REVENUE SOURCES (% of Fund's net assets) General Obligations 37.1 Transportation 19.2 Education 17.5 Health Care 11.7 Others(Individually Less Than 5%) 14.5 100.0 AAA 5.6 AA 32.3 A 45.4 BBB 10.6 Not Rated 1.3 Short-Term Investments and Net Other Assets (Liabilities) 4.8 QUALITY DIVERSIFICATION (% of Fund's net assets) We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes. |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since December 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by January 29, 2025 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments fidelity.com . The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes: Management fee The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. |
| Material Fund Change Expenses [Text Block] | The fees associated with this class changed during the reporting year. The variations in class fees are primarily the result of the following changes: Management fee The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since December 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by January 29, 2025 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments fidelity.com . |
| Updated Prospectus Phone Number | 1-800-544-8544</span>" id="sjs-B39"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> |
| Updated Prospectus Email Address | fidfunddocuments@fidelity.com</span>" id="sjs-B40"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B41"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Fidelity Connecticut Municipal Income Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Connecticut Municipal Income Fund |
| Class Name | Fidelity® Connecticut Municipal Income Fund |
| Trading Symbol | FICNX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® Connecticut Municipal Income Fund for the period December 1, 2023 to November 30, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Connecticut Municipal Income Fund $ 0.47 % |
| Expenses Paid, Amount | $ 48 |
| Expense Ratio, Percent | 0.47% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B58"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE November 30, 2014 through November 30, 2024. Initial investment of $10,000. Fidelity® Connecticut Municipal Income Fund $10,000 $10,310 $10,242 $10,678 $10,765 $11,716 $12,189 $12,481 $11,444 $11,864 $12,435 Bloomberg Connecticut 2 + Year Enhanced Municipal Bond Index Linked $10,000 $10,313 $10,206 $10,732 $10,878 $11,866 $12,502 $12,683 $11,762 $12,219 $12,715 Bloomberg Municipal Bond Index $10,000 $10,310 $10,287 $10,862 $10,984 $11,917 $12,500 $12,747 $11,645 $12,144 $12,743 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Fidelity® Connecticut Municipal Income Fund 4.81% 1.20% 2.20% Bloomberg Connecticut 2 + Year Enhanced Municipal Bond Index Linked 4.06% 1.39% 2.43% Bloomberg Municipal Bond Index 4.93% 1.35% 2.45% Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 317,136,142 |
| Holdings Count | shares | 223 |
| Advisory Fees Paid, Amount | $ 1,232,235 |
| Investment Company Portfolio Turnover | 20% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of November 30, 2024) KEY FACTS Fund Size $ Number of Holdings 223 Total Advisory Fee $ Portfolio Turnover 20 % |
| Holdings [Text Block] | REVENUE SOURCES (% of Fund's net assets) General Obligations 49.9 Health Care 13.8 Education 12.0 Housing 8.3 Special Tax 6.5 Others(Individually Less Than 5%) 9.5 100.0 AAA 9.3 AA 44.1 A 20.8 BBB 11.3 BB 3.2 Not Rated 3.6 Short-Term Investments and Net Other Assets (Liabilities) 7.7 QUALITY DIVERSIFICATION (% of Fund's net assets) We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes. |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since December 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by January 29, 2025 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments fidelity.com . The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. |
| Material Fund Change Expenses [Text Block] | The fund's transfer agent and pricing & bookkeeping fees were changed to a fixed rate effective December 1, 2023, through February 29, 2024, in anticipation of the transition to a new management fee structure. Effective March 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since December 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by January 29, 2025 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments fidelity.com . |
| Updated Prospectus Phone Number | 1-800-544-8544</span>" id="sjs-B71"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> |
| Updated Prospectus Email Address | fidfunddocuments@fidelity.com</span>" id="sjs-B72"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B73"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 60 Months Ended | 120 Months Ended | 132 Months Ended | ||||||||||
| Nov. 30, 2024 | Nov. 30, 2024 | Nov. 30, 2024 | Nov. 30, 2024 | Nov. 30, 2023 | Nov. 30, 2022 | Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2016 | Nov. 30, 2015 | Nov. 30, 2014 | |
| C000016604_1_BBIndexMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 4.93% | |||||||||||||
| C000016604_1_BBIndexMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 1.35% | |||||||||||||
| C000016604_1_BBIndexMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 2.45% | |||||||||||||
| C000016602_1_BBIndexMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 4.93% | |||||||||||||
| C000016602_1_BBIndexMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 1.35% | |||||||||||||
| C000016602_1_BBIndexMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 2.45% | |||||||||||||
| C000016604_LG_ClassMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Fidelity® New Jersey Municipal Income Fund</span>" id="sjs-E23"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® New Jersey Municipal Income Fund</span> | |||||||||||||
| C000016604_ClassMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 10,000 | |||||||||||||
| C000016604_ClassMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 10,156 | |||||||||||||
| C000016604_ClassMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 10,266 | |||||||||||||
| C000016604_ClassMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 10,927 | |||||||||||||
| C000016604_ClassMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 11,048 | |||||||||||||
| C000016604_ClassMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 12,115 | |||||||||||||
| C000016604_ClassMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 12,634 | |||||||||||||
| C000016604_ClassMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 13,086 | |||||||||||||
| C000016604_ClassMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 11,880 | |||||||||||||
| C000016604_ClassMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 12,504 | |||||||||||||
| C000016604_ClassMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 13,201 | $ 13,201 | $ 13,201 | $ 13,201 | ||||||||||
| C000016604_LG_1_AdditionalIndexMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Bloomberg New Jersey Enhanced Modified Municipal Bond Index</span>" id="sjs-E59"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg New Jersey Enhanced Modified Municipal Bond Index</span> | |||||||||||||
| C000016604_1_AdditionalIndexMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000016604_1_AdditionalIndexMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,187 | |||||||||||||
| C000016604_1_AdditionalIndexMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,302 | |||||||||||||
| C000016604_1_AdditionalIndexMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,037 | |||||||||||||
| C000016604_1_AdditionalIndexMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,227 | |||||||||||||
| C000016604_1_AdditionalIndexMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,295 | |||||||||||||
| C000016604_1_AdditionalIndexMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,844 | |||||||||||||
| C000016604_1_AdditionalIndexMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 13,335 | |||||||||||||
| C000016604_1_AdditionalIndexMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,185 | |||||||||||||
| C000016604_1_AdditionalIndexMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,816 | |||||||||||||
| C000016604_1_AdditionalIndexMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 13,475 | 13,475 | 13,475 | $ 13,475 | ||||||||||
| C000016604_LG_2_AdditionalIndexMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index</span>" id="sjs-E95"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Municipal Bond Index</span> | |||||||||||||
| C000016604_2_AdditionalIndexMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000016604_2_AdditionalIndexMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,310 | |||||||||||||
| C000016604_2_AdditionalIndexMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,287 | |||||||||||||
| C000016604_2_AdditionalIndexMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,862 | |||||||||||||
| C000016604_2_AdditionalIndexMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,984 | |||||||||||||
| C000016604_2_AdditionalIndexMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,917 | |||||||||||||
| C000016604_2_AdditionalIndexMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,500 | |||||||||||||
| C000016604_2_AdditionalIndexMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,747 | |||||||||||||
| C000016604_2_AdditionalIndexMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,645 | |||||||||||||
| C000016604_2_AdditionalIndexMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,144 | |||||||||||||
| C000016604_2_AdditionalIndexMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 12,743 | $ 12,743 | $ 12,743 | $ 12,743 | ||||||||||
| C000016604_NoLoadClassMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 5.58% | |||||||||||||
| C000016604_NoLoadClassMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 1.73% | |||||||||||||
| C000016604_NoLoadClassMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 2.82% | |||||||||||||
| C000016604_0_AdditionalIndexMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 5.15% | |||||||||||||
| C000016604_0_AdditionalIndexMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 1.85% | |||||||||||||
| C000016604_0_AdditionalIndexMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 3.03% | |||||||||||||
| C000016602_LG_ClassMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Fidelity® Connecticut Municipal Income Fund</span>" id="sjs-E149"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Connecticut Municipal Income Fund</span> | |||||||||||||
| C000016602_ClassMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000016602_ClassMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,310 | |||||||||||||
| C000016602_ClassMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,242 | |||||||||||||
| C000016602_ClassMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,678 | |||||||||||||
| C000016602_ClassMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,765 | |||||||||||||
| C000016602_ClassMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,716 | |||||||||||||
| C000016602_ClassMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,189 | |||||||||||||
| C000016602_ClassMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,481 | |||||||||||||
| C000016602_ClassMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,444 | |||||||||||||
| C000016602_ClassMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,864 | |||||||||||||
| C000016602_ClassMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 12,435 | $ 12,435 | $ 12,435 | $ 12,435 | ||||||||||
| C000016602_LG_1_AdditionalIndexMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Connecticut 2 + Year Enhanced Municipal Bond Index Linked</span>" id="sjs-E185"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Connecticut 2 + Year Enhanced Municipal Bond Index Linked</span> | |||||||||||||
| C000016602_1_AdditionalIndexMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000016602_1_AdditionalIndexMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,313 | |||||||||||||
| C000016602_1_AdditionalIndexMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,206 | |||||||||||||
| C000016602_1_AdditionalIndexMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,732 | |||||||||||||
| C000016602_1_AdditionalIndexMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,878 | |||||||||||||
| C000016602_1_AdditionalIndexMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,866 | |||||||||||||
| C000016602_1_AdditionalIndexMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,502 | |||||||||||||
| C000016602_1_AdditionalIndexMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,683 | |||||||||||||
| C000016602_1_AdditionalIndexMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,762 | |||||||||||||
| C000016602_1_AdditionalIndexMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,219 | |||||||||||||
| C000016602_1_AdditionalIndexMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,715 | 12,715 | 12,715 | $ 12,715 | ||||||||||
| C000016602_LG_2_AdditionalIndexMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index</span>" id="sjs-E221"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg Municipal Bond Index</span> | |||||||||||||
| C000016602_2_AdditionalIndexMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 10,000 | |||||||||||||
| C000016602_2_AdditionalIndexMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 10,310 | |||||||||||||
| C000016602_2_AdditionalIndexMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 10,287 | |||||||||||||
| C000016602_2_AdditionalIndexMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 10,862 | |||||||||||||
| C000016602_2_AdditionalIndexMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 10,984 | |||||||||||||
| C000016602_2_AdditionalIndexMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 11,917 | |||||||||||||
| C000016602_2_AdditionalIndexMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 12,500 | |||||||||||||
| C000016602_2_AdditionalIndexMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 12,747 | |||||||||||||
| C000016602_2_AdditionalIndexMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 11,645 | |||||||||||||
| C000016602_2_AdditionalIndexMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 12,144 | |||||||||||||
| C000016602_2_AdditionalIndexMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 12,743 | $ 12,743 | $ 12,743 | $ 12,743 | ||||||||||
| C000016602_NoLoadClassMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 4.81% | |||||||||||||
| C000016602_NoLoadClassMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 1.20% | |||||||||||||
| C000016602_NoLoadClassMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 2.20% | |||||||||||||
| C000016602_0_AdditionalIndexMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 4.06% | |||||||||||||
| C000016602_0_AdditionalIndexMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 1.39% | |||||||||||||
| C000016602_0_AdditionalIndexMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 2.43% |
| Shareholder Report, Holdings (Details) | Nov. 30, 2024 |
| Fidelity New Jersey Municipal Income Fund | RS0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.10% |
| Fidelity New Jersey Municipal Income Fund | RS1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.20% |
| Fidelity New Jersey Municipal Income Fund | RS2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.50% |
| Fidelity New Jersey Municipal Income Fund | RS3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| Fidelity New Jersey Municipal Income Fund | RS4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.50% |
| Fidelity New Jersey Municipal Income Fund | QDAAAMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity New Jersey Municipal Income Fund | QDAAMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.30% |
| Fidelity New Jersey Municipal Income Fund | QDAMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 45.40% |
| Fidelity New Jersey Municipal Income Fund | QDBBBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity New Jersey Municipal Income Fund | QDNotRatedMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity New Jersey Municipal Income Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Connecticut Municipal Income Fund | RS0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.90% |
| Fidelity Connecticut Municipal Income Fund | RS1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.80% |
| Fidelity Connecticut Municipal Income Fund | RS2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12% |
| Fidelity Connecticut Municipal Income Fund | RS3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.30% |
| Fidelity Connecticut Municipal Income Fund | RS4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Connecticut Municipal Income Fund | RS5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.50% |
| Fidelity Connecticut Municipal Income Fund | QDAAAMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Connecticut Municipal Income Fund | QDAAMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 44.10% |
| Fidelity Connecticut Municipal Income Fund | QDAMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.80% |
| Fidelity Connecticut Municipal Income Fund | QDBBBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.30% |
| Fidelity Connecticut Municipal Income Fund | QDNotRatedMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Connecticut Municipal Income Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| Fidelity Connecticut Municipal Income Fund | QDBBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
