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Shareholder Report
 6 Months Ended
Aug. 31, 2024
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Fidelity California Municipal Trust
Entity Central Index Key 0000718891
Entity Investment Company Type N-1A
Document Period End Date Aug. 31, 2024
Fidelity Advisor California Municipal Income Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity® California Municipal Income Fund
Class Name Fidelity Advisor® California Municipal Income Fund Class Z
Trading Symbol FIJBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® California Municipal Income Fund for the period March 1, 2024 to August 31, 2024.
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 
$ 20 
0.40%
  
Expenses Paid, Amount $ 20
Expense Ratio, Percent 0.40%
Net Assets $ 1,595,445,829
Holdings Count | shares 629
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,595,445,829
 
  
Number of Holdings
629
 
  
Portfolio Turnover
25%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 28.7   Transportation 24.7   Health Care 14.9   Education 12.0   Special Tax 5.4   Others(Individually Less Than 5%) 14.3   100.0       AAA 1.9 AA 46.2 A 35.1 BBB 10.3 Not Rated 4.9 Short-Term Investments and Net Other Assets (Liabilities) 1.6 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.    
Fidelity Advisor California Municipal Income Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity® California Municipal Income Fund
Class Name Fidelity Advisor® California Municipal Income Fund Class M
Trading Symbol FCMTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® California Municipal Income Fund for the period March 1, 2024 to August 31, 2024.
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 
$ 34 
0.67%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.67%
Net Assets $ 1,595,445,829
Holdings Count | shares 629
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,595,445,829
 
  
Number of Holdings
629
 
  
Portfolio Turnover
25%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 28.7   Transportation 24.7   Health Care 14.9   Education 12.0   Special Tax 5.4   Others(Individually Less Than 5%) 14.3   100.0       AAA 1.9 AA 46.2 A 35.1 BBB 10.3 Not Rated 4.9 Short-Term Investments and Net Other Assets (Liabilities) 1.6 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.    
Fidelity Advisor California Municipal Income Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity® California Municipal Income Fund
Class Name Fidelity Advisor® California Municipal Income Fund Class C
Trading Symbol FCMKX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® California Municipal Income Fund for the period March 1, 2024 to August 31, 2024.
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 
$ 75 
1.48%
  
Expenses Paid, Amount $ 75
Expense Ratio, Percent 1.48%
Net Assets $ 1,595,445,829
Holdings Count | shares 629
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,595,445,829
 
  
Number of Holdings
629
 
  
Portfolio Turnover
25%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 28.7   Transportation 24.7   Health Care 14.9   Education 12.0   Special Tax 5.4   Others(Individually Less Than 5%) 14.3   100.0       AAA 1.9 AA 46.2 A 35.1 BBB 10.3 Not Rated 4.9 Short-Term Investments and Net Other Assets (Liabilities) 1.6 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.    
Fidelity California Limited Term Tax-Free Bond Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® California Limited Term Tax-Free Bond Fund
Class Name Fidelity® California Limited Term Tax-Free Bond Fund
Trading Symbol FCSTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® California Limited Term Tax-Free Bond Fund for the period March 1, 2024 to August 31, 2024.
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® California Limited Term Tax-Free Bond Fund 
$ 15 
0.29%
  
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.29%
Net Assets $ 519,549,936
Holdings Count | shares 279
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$519,549,936
 
  
Number of Holdings
279
 
  
Portfolio Turnover
12%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 41.1   Health Care 19.9   Education 9.5   Transportation 7.9   Electric Utilities 5.2   Others(Individually Less Than 5%) 16.4   100.0       AAA 6.5 AA 56.4 A 25.1 BBB 8.0 Not Rated 2.2 Short-Term Investments and Net Other Assets (Liabilities) 1.8 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.    
Fidelity Advisor California Municipal Income Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity® California Municipal Income Fund
Class Name Fidelity Advisor® California Municipal Income Fund Class I
Trading Symbol FCMQX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® California Municipal Income Fund for the period March 1, 2024 to August 31, 2024.
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 
$ 27 
0.53%
  
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.53%
Net Assets $ 1,595,445,829
Holdings Count | shares 629
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,595,445,829
 
  
Number of Holdings
629
 
  
Portfolio Turnover
25%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 28.7   Transportation 24.7   Health Care 14.9   Education 12.0   Special Tax 5.4   Others(Individually Less Than 5%) 14.3   100.0       AAA 1.9 AA 46.2 A 35.1 BBB 10.3 Not Rated 4.9 Short-Term Investments and Net Other Assets (Liabilities) 1.6 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.    
Fidelity Advisor California Municipal Income Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity® California Municipal Income Fund
Class Name Fidelity Advisor® California Municipal Income Fund Class A
Trading Symbol FCMAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® California Municipal Income Fund for the period March 1, 2024 to August 31, 2024.
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 
$ 39 
0.76%
  
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.76%
Net Assets $ 1,595,445,829
Holdings Count | shares 629
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,595,445,829
 
  
Number of Holdings
629
 
  
Portfolio Turnover
25%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 28.7   Transportation 24.7   Health Care 14.9   Education 12.0   Special Tax 5.4   Others(Individually Less Than 5%) 14.3   100.0       AAA 1.9 AA 46.2 A 35.1 BBB 10.3 Not Rated 4.9 Short-Term Investments and Net Other Assets (Liabilities) 1.6 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.    
Fidelity California Municipal Income Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® California Municipal Income Fund
Class Name Fidelity® California Municipal Income Fund
Trading Symbol FCTFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® California Municipal Income Fund for the period March 1, 2024 to August 31, 2024.
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® California Municipal Income Fund 
$ 22 
0.43%
  
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.43%
Net Assets $ 1,595,445,829
Holdings Count | shares 629
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of August 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$1,595,445,829
 
  
Number of Holdings
629
 
  
Portfolio Turnover
25%
 
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 28.7   Transportation 24.7   Health Care 14.9   Education 12.0   Special Tax 5.4   Others(Individually Less Than 5%) 14.3   100.0       AAA 1.9 AA 46.2 A 35.1 BBB 10.3 Not Rated 4.9 Short-Term Investments and Net Other Assets (Liabilities) 1.6 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.