| Form N-CSR Cover | 6 Months Ended |
| Aug. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Franklin California Tax Free Income Fund |
| Entity Central Index Key | 0000225375 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| Shareholder Report | 6 Months Ended | |
| Aug. 31, 2024 USD ($) $ / shares | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | Franklin California Tax Free Income Fund | |
| Entity Central Index Key | 0000225375 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Aug. 31, 2024 | |
| Class A | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Franklin California Tax-Free Income Fund | |
| Class Name | Class A | |
| Trading Symbol | FTFQX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Franklin California Tax-Free 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 https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) DIAL BEN/342-5236 . | |
| Additional Information Phone Number | (800) DIAL BEN/342-5236 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment † Class A $38 0.75% | [1] |
| Expenses Paid, Amount | $ 38 | |
| Expense Ratio, Percent | 0.75% | |
| Net Assets | $ 13,332,749,908 | |
| Holdings Count | $ / shares | 1,090 | [2] |
| Investment Company Portfolio Turnover | 2.39% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of August 31, 2024) Total Net Assets $13,332,749,908 Total Number of Portfolio Holdings * 1,090 Portfolio Turnover Rate 2.39% | [2] |
| Holdings [Text Block] | ||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Class A1 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Franklin California Tax-Free Income Fund | |
| Class Name | Class A1 | |
| Trading Symbol | FKTFX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Franklin California Tax-Free 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 https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) DIAL BEN/342-5236 . | |
| Additional Information Phone Number | (800) DIAL BEN/342-5236 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment † Class A1 $31 0.60% | [3] |
| Expenses Paid, Amount | $ 31 | |
| Expense Ratio, Percent | 0.60% | |
| Net Assets | $ 13,332,749,908 | |
| Holdings Count | $ / shares | 1,090 | [4] |
| Investment Company Portfolio Turnover | 2.39% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of August 31, 2024) Total Net Assets $13,332,749,908 Total Number of Portfolio Holdings * 1,090 Portfolio Turnover Rate 2.39% | [4] |
| Holdings [Text Block] | ||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Class C | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Franklin California Tax-Free Income Fund | |
| Class Name | Class C | |
| Trading Symbol | FRCTX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Franklin California Tax-Free 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 https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) DIAL BEN/342-5236 . | |
| Additional Information Phone Number | (800) DIAL BEN/342-5236 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment † Class C $59 1.15% | [5] |
| Expenses Paid, Amount | $ 59 | |
| Expense Ratio, Percent | 1.15% | |
| Net Assets | $ 13,332,749,908 | |
| Holdings Count | $ / shares | 1,090 | [6] |
| Investment Company Portfolio Turnover | 2.39% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of August 31, 2024) Total Net Assets $13,332,749,908 Total Number of Portfolio Holdings * 1,090 Portfolio Turnover Rate 2.39% | [6] |
| Holdings [Text Block] | ||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Class R6 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Franklin California Tax-Free Income Fund | |
| Class Name | Class R6 | |
| Trading Symbol | FKTQX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Franklin California Tax-Free 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 https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) DIAL BEN/342-5236 . | |
| Additional Information Phone Number | (800) DIAL BEN/342-5236 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment † Class R6 $24 0.47% | [7] |
| Expenses Paid, Amount | $ 24 | |
| Expense Ratio, Percent | 0.47% | |
| Net Assets | $ 13,332,749,908 | |
| Holdings Count | $ / shares | 1,090 | [8] |
| Investment Company Portfolio Turnover | 2.39% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of August 31, 2024) Total Net Assets $13,332,749,908 Total Number of Portfolio Holdings * 1,090 Portfolio Turnover Rate 2.39% | [8] |
| Holdings [Text Block] | ||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Advisor Class | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Franklin California Tax-Free Income Fund | |
| Class Name | Advisor Class | |
| Trading Symbol | FCAVX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Franklin California Tax-Free 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 https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) DIAL BEN/342-5236 . | |
| Additional Information Phone Number | (800) DIAL BEN/342-5236 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment † Advisor Class $26 0.50% | [9] |
| Expenses Paid, Amount | $ 26 | |
| Expense Ratio, Percent | 0.50% | |
| Net Assets | $ 13,332,749,908 | |
| Holdings Count | $ / shares | 1,090 | [10] |
| Investment Company Portfolio Turnover | 2.39% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of August 31, 2024) Total Net Assets $13,332,749,908 Total Number of Portfolio Holdings * 1,090 Portfolio Turnover Rate 2.39% | [10] |
| Holdings [Text Block] | ||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| [1] † Annualized. * Does not include derivatives, except purchased options, if any. † Annualized. * Does not include derivatives, except purchased options, if any. † Annualized. * Does not include derivatives, except purchased options, if any. † Annualized. * Does not include derivatives, except purchased options, if any. † Annualized. * Does not include derivatives, except purchased options, if any. | ||
| Label | Element | Value |
| Class A | Transportation [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 26.30% |
| Class A | Local [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 13% |
| Class A | Housing [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 11% |
| Class A | Health Care [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 11% |
| Class A | Utilities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 8.80% |
| Class A | Education [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 8.40% |
| Class A | Special Tax [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 7.20% |
| Class A | Industrial Dev. Revenue and Pollution Control [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 5.30% |
| Class A | State General Obligation [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.90% |
| Class A | Refunded [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 2.70% |
| Class A | Lease [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 1.60% |
| Class A | Other Revenue Bonds [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0.80% |
| Label | Element | Value |
| Class A1 | Transportation [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 26.30% |
| Class A1 | Local [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 13% |
| Class A1 | Housing [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 11% |
| Class A1 | Health Care [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 11% |
| Class A1 | Utilities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 8.80% |
| Class A1 | Education [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 8.40% |
| Class A1 | Special Tax [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 7.20% |
| Class A1 | Industrial Dev. Revenue and Pollution Control [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 5.30% |
| Class A1 | State General Obligation [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.90% |
| Class A1 | Refunded [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 2.70% |
| Class A1 | Lease [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 1.60% |
| Class A1 | Other Revenue Bonds [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0.80% |
| Label | Element | Value |
| Class C | Transportation [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 26.30% |
| Class C | Local [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 13% |
| Class C | Housing [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 11% |
| Class C | Health Care [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 11% |
| Class C | Utilities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 8.80% |
| Class C | Education [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 8.40% |
| Class C | Special Tax [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 7.20% |
| Class C | Industrial Dev. Revenue and Pollution Control [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 5.30% |
| Class C | State General Obligation [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.90% |
| Class C | Refunded [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 2.70% |
| Class C | Lease [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 1.60% |
| Class C | Other Revenue Bonds [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0.80% |
| Label | Element | Value |
| Class R6 | Transportation [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 26.30% |
| Class R6 | Local [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 13% |
| Class R6 | Housing [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 11% |
| Class R6 | Health Care [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 11% |
| Class R6 | Utilities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 8.80% |
| Class R6 | Education [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 8.40% |
| Class R6 | Special Tax [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 7.20% |
| Class R6 | Industrial Dev. Revenue and Pollution Control [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 5.30% |
| Class R6 | State General Obligation [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.90% |
| Class R6 | Refunded [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 2.70% |
| Class R6 | Lease [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 1.60% |
| Class R6 | Other Revenue Bonds [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0.80% |
| Label | Element | Value |
| Advisor Class | Transportation [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 26.30% |
| Advisor Class | Local [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 13% |
| Advisor Class | Housing [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 11% |
| Advisor Class | Health Care [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 11% |
| Advisor Class | Utilities [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 8.80% |
| Advisor Class | Education [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 8.40% |
| Advisor Class | Special Tax [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 7.20% |
| Advisor Class | Industrial Dev. Revenue and Pollution Control [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 5.30% |
| Advisor Class | State General Obligation [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 3.90% |
| Advisor Class | Refunded [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 2.70% |
| Advisor Class | Lease [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 1.60% |
| Advisor Class | Other Revenue Bonds [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0.80% |
