Shareholder Report, Line Graph (Details) - USD ($) |
6 Months Ended | 12 Months Ended | 18 Months Ended | 24 Months Ended | 30 Months Ended | 36 Months Ended | 42 Months Ended | 48 Months Ended | 54 Months Ended | 60 Months Ended | 66 Months Ended | 72 Months Ended | 78 Months Ended | 84 Months Ended | 90 Months Ended | 96 Months Ended | 102 Months Ended | 108 Months Ended | 114 Months Ended | 120 Months Ended | |||
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Jan. 27, 2017 |
Jul. 31, 2016 |
Jul. 31, 2017 |
Jul. 31, 2026 |
Jul. 31, 2017 |
Jul. 31, 2018 |
Jul. 31, 2018 |
Jul. 31, 2019 |
Jul. 31, 2019 |
Jul. 31, 2020 |
Jul. 31, 2020 |
Jul. 31, 2021 |
Jul. 31, 2021 |
Jul. 31, 2022 |
Jul. 31, 2022 |
Jul. 31, 2023 |
Jul. 31, 2023 |
Jul. 31, 2024 |
Jul. 31, 2024 |
Jul. 31, 2025 |
Jul. 31, 2025 |
Jul. 31, 2026 |
Jul. 31, 2026 |
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| The Tax-Exempt Fund of California® - Class A [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | The Tax-Exempt Fund of California — Class A (with sales charge) | ||||||||||||||||||||||
| Accumulated Value | $ 9,625 | $ 9,604 | $ 9,774 | $ 10,432 | $ 10,864 | $ 11,290 | $ 10,435 | $ 10,485 | $ 11,061 | $ 10,970 | $ 11,597 | ||||||||||||
| The Tax-Exempt Fund of California® - Class C [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | The Tax-Exempt Fund of California — Class C (with sales charge) | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 9,900 | 9,996 | 10,586 | 10,942 | 11,286 | 10,353 | 10,326 | 10,809 | 10,720 | 11,333 | ||||||||||||
| The Tax-Exempt Fund of California® - Class F-1 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | The Tax-Exempt Fund of California — Class F-1 | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 9,966 | 10,129 | 10,797 | 11,234 | 11,663 | 10,770 | 10,812 | 11,395 | 11,290 | 11,924 | ||||||||||||
| The Tax-Exempt Fund of California® - Class F-2 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | The Tax-Exempt Fund of California — Class F-2 | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 9,990 | 10,180 | 10,880 | 11,351 | 11,816 | 10,941 | 11,014 | 11,641 | 11,564 | 12,246 | ||||||||||||
| The Tax-Exempt Fund of California® - Class F-3 [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | The Tax-Exempt Fund of California — Class F-3 | ||||||||||||||||||||||
| Accumulated Value | $ 10,000 | $ 10,379 | $ 10,587 | $ 11,326 | $ 11,827 | $ 12,323 | $ 11,421 | $ 11,508 | $ 12,174 | $ 12,107 | $ 12,834 | ||||||||||||
| Bloomberg Municipal Bond Index [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||
| Accumulated Value | 10,000 | 10,000 | 10,391 | 10,026 | 10,494 | 10,125 | 11,261 | 10,865 | 11,865 | 11,447 | 12,255 | 11,824 | 11,406 | 11,005 | 11,512 | 11,107 | 11,943 | 11,523 | 11,942 | 11,522 | 12,571 | 12,129 | |
| Bloomberg California Municipal Index [Member] | |||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg California Municipal Index | ||||||||||||||||||||||
| Accumulated Value | $ 10,000 | $ 10,000 | $ 10,455 | $ 10,007 | $ 10,575 | $ 10,122 | $ 11,322 | $ 10,837 | $ 11,973 | $ 11,460 | $ 12,272 | $ 11,746 | $ 11,439 | $ 10,949 | $ 11,560 | $ 11,064 | $ 11,970 | $ 11,457 | $ 11,974 | $ 11,460 | $ 12,577 | $ 12,039 | |