v3.26.3
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 114 Months Ended 120 Months Ended
Jul. 31, 2026
Jul. 31, 2026
Jul. 31, 2026
 [2]
Jul. 31, 2026
The Tax-Exempt Fund of California® - Class A [Member]        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Tax-Exempt Fund of California — Class A (with sales charge)      
Average Annual Return, Percent [1] 1.76% (0.23%)   1.49%
The Tax-Exempt Fund of California® - Class C [Member]        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Tax-Exempt Fund of California — Class C (with sales charge)      
Average Annual Return, Percent [1] 3.93% (0.22%)   1.26%
The Tax-Exempt Fund of California® - Class F-1 [Member]        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Tax-Exempt Fund of California — Class F-1      
Average Annual Return, Percent [1] 5.62% 0.45%   1.78%
The Tax-Exempt Fund of California® - Class F-2 [Member]        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Tax-Exempt Fund of California — Class F-2      
Average Annual Return, Percent [1] 5.90% 0.72%   2.05%
The Tax-Exempt Fund of California® - Class F-3 [Member]        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Tax-Exempt Fund of California — Class F-3      
Average Annual Return, Percent [1] 6.01% 0.82% 2.66%  
Without Sales Load [Member] | The Tax-Exempt Fund of California® - Class A [Member]        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Tax-Exempt Fund of California — Class A (without sales charge)      
Average Annual Return, Percent [1] 5.72% 0.54%   1.88%
Without Sales Load [Member] | The Tax-Exempt Fund of California® - Class C [Member]        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name The Tax-Exempt Fund of California — Class C (without sales charge)      
Average Annual Return, Percent [1] 4.93% (0.22%)   1.26%
Bloomberg Municipal Bond Index [Member]        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name Bloomberg Municipal Bond Index      
Average Annual Return, Percent [3] 5.27% 0.51% 2.43% 1.95%
Bloomberg California Municipal Index [Member]        
Average Annual Return [Line Items]        
Line Graph and Table Measure Name Bloomberg California Municipal Index      
Average Annual Return, Percent [3] 5.05% 0.49% 2.44% 1.87%
[1] Investment results assume all distributions are reinvested and reflect applicable fees and expenses. When applicable, results reflect fee waivers and/or expense reimbursements, without which they would have been lower.
[2] Class F-3 shares were first offered on January 27, 2017.
[3] Results assume all distributions are reinvested. Any market index shown is unmanaged, and therefore, has no expenses. Investors cannot invest directly in an index. Source(s): Bloomberg Index Services Ltd.