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Shareholder Report
 6 Months Ended
Aug. 31, 2025
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, 2025
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, 2025 to August 31, 2025.
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 $ 1,763,081,187
Holdings Count | shares 737
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,763,081,187
  
Number of Holdings
737
  
Portfolio Turnover
25%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 39.2   Transportation 20.3   Education 10.8   Health Care 9.5   Electric Utilities 5.8   Others(Individually Less Than 5%) 14.8   100.4       AAA 0.6 AA 57.8 A 30.5 BBB 7.8 Not Rated 3.7 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 0.6                                  AA - 57.8                                  A - 30.5                                   BBB - 7.8                                  Not Rated - 3.7                          Short-Term Investments and Net Other Assets (Liabilities) - (0.4)%   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 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, 2025 to August 31, 2025.
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 $ 1,763,081,187
Holdings Count | shares 737
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,763,081,187
  
Number of Holdings
737
  
Portfolio Turnover
25%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 39.2   Transportation 20.3   Education 10.8   Health Care 9.5   Electric Utilities 5.8   Others(Individually Less Than 5%) 14.8   100.4       AAA 0.6 AA 57.8 A 30.5 BBB 7.8 Not Rated 3.7 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 0.6                                  AA - 57.8                                  A - 30.5                                   BBB - 7.8                                  Not Rated - 3.7                          Short-Term Investments and Net Other Assets (Liabilities) - (0.4)%   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, 2025 to August 31, 2025.
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 $ 1,763,081,187
Holdings Count | shares 737
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,763,081,187
  
Number of Holdings
737
  
Portfolio Turnover
25%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 39.2   Transportation 20.3   Education 10.8   Health Care 9.5   Electric Utilities 5.8   Others(Individually Less Than 5%) 14.8   100.4       AAA 0.6 AA 57.8 A 30.5 BBB 7.8 Not Rated 3.7 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 0.6                                  AA - 57.8                                  A - 30.5                                   BBB - 7.8                                  Not Rated - 3.7                          Short-Term Investments and Net Other Assets (Liabilities) - (0.4)%   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, 2025 to August 31, 2025.
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 
$ 26 
0.52%
  
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.52%
Net Assets $ 1,763,081,187
Holdings Count | shares 737
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,763,081,187
  
Number of Holdings
737
  
Portfolio Turnover
25%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 39.2   Transportation 20.3   Education 10.8   Health Care 9.5   Electric Utilities 5.8   Others(Individually Less Than 5%) 14.8   100.4       AAA 0.6 AA 57.8 A 30.5 BBB 7.8 Not Rated 3.7 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 0.6                                  AA - 57.8                                  A - 30.5                                   BBB - 7.8                                  Not Rated - 3.7                          Short-Term Investments and Net Other Assets (Liabilities) - (0.4)%   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, 2025 to August 31, 2025.
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 
$ 74 
1.48%
  
Expenses Paid, Amount $ 74
Expense Ratio, Percent 1.48%
Net Assets $ 1,763,081,187
Holdings Count | shares 737
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,763,081,187
  
Number of Holdings
737
  
Portfolio Turnover
25%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 39.2   Transportation 20.3   Education 10.8   Health Care 9.5   Electric Utilities 5.8   Others(Individually Less Than 5%) 14.8   100.4       AAA 0.6 AA 57.8 A 30.5 BBB 7.8 Not Rated 3.7 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 0.6                                  AA - 57.8                                  A - 30.5                                   BBB - 7.8                                  Not Rated - 3.7                          Short-Term Investments and Net Other Assets (Liabilities) - (0.4)%   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, 2025 to August 31, 2025.
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 
$ 38 
0.76%
  
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.76%
Net Assets $ 1,763,081,187
Holdings Count | shares 737
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,763,081,187
  
Number of Holdings
737
  
Portfolio Turnover
25%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 39.2   Transportation 20.3   Education 10.8   Health Care 9.5   Electric Utilities 5.8   Others(Individually Less Than 5%) 14.8   100.4       AAA 0.6 AA 57.8 A 30.5 BBB 7.8 Not Rated 3.7 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 0.6                                  AA - 57.8                                  A - 30.5                                   BBB - 7.8                                  Not Rated - 3.7                          Short-Term Investments and Net Other Assets (Liabilities) - (0.4)%   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, 2025 to August 31, 2025.
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 
0.30%
  
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.30%
Net Assets $ 599,338,067
Holdings Count | shares 301
Investment Company Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of August 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$599,338,067
  
Number of Holdings
301
  
Portfolio Turnover
15%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 47.0   Health Care 11.4   Education 10.7   Electric Utilities 6.2   Water & Sewer 6.1   Transportation 5.7   Others(Individually Less Than 5%) 10.1   97.2       AAA 3.8 AA 63.0 A 21.6 BBB 6.1 Not Rated 2.7 Short-Term Investments and Net Other Assets (Liabilities) 2.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 3.8                                  AA - 63.0                                  A - 21.6                                   BBB - 6.1                                  Not Rated - 2.7                            Short-Term Investments and Net Other Assets (Liabilities) - 2.8   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.