Shareholder Report, Average Annual Return (Details)
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12 Months Ended |
36 Months Ended |
60 Months Ended |
120 Months Ended |
May 31, 2025 |
May 31, 2025 |
May 31, 2025 |
May 31, 2025 |
| C000001874 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
High Yield Municipal Bond Fund (Class A/JHTFX)
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| Average Annual Return, Percent |
(1.12%)
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1.61%
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2.09%
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| C000001876 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
High Yield Municipal Bond Fund (Class C/JCTFX)
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| Average Annual Return, Percent |
1.19%
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1.69%
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1.74%
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| C000193018 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
High Yield Municipal Bond Fund (Class R6/JCTRX)
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| Average Annual Return, Percent |
3.31%
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2.65%
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2.67%
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| C000178765 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
High Yield Municipal Bond Fund (Class I/JHYMX)
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| Average Annual Return, Percent |
3.09%
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2.62%
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2.65%
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| C000001877 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Municipal Opportunities Fund (Class A/TAMBX)
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| Average Annual Return, Percent |
(1.54%)
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0.66%
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1.61%
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| C000193019 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Municipal Opportunities Fund (Class R6/JTMRX)
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| Average Annual Return, Percent |
2.65%
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1.65%
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2.16%
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| C000178766 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Municipal Opportunities Fund (Class I/JTBDX)
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| Average Annual Return, Percent |
2.71%
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1.62%
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2.16%
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| C000001879 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Municipal Opportunities Fund (Class C/TBMBX)
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| Average Annual Return, Percent |
0.80%
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0.73%
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1.26%
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| C000236446 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Short Duration Municipal Opportunities Fund (Class A/JHSFX)
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| Average Annual Return, Percent |
2.44%
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3.43%
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| C000236447 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Short Duration Municipal Opportunities Fund (Class C/JHSHX)
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| Average Annual Return, Percent |
3.12%
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3.45%
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| C000236448 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Short Duration Municipal Opportunities Fund (Class I/JHSJX)
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| Average Annual Return, Percent |
5.05%
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4.41%
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| C000236445 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Short Duration Municipal Opportunities Fund (Class R6/JHSKX)
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| Average Annual Return, Percent |
5.11%
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4.44%
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| Without Sales Load [Member] | C000001874 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
High Yield Municipal Bond Fund (Class A/JHTFX)—excluding sales charge
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| Average Annual Return, Percent |
2.94%
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2.46%
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2.51%
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| Without Sales Load [Member] | C000001876 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
High Yield Municipal Bond Fund (Class C/JCTFX)—excluding sales charge
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| Average Annual Return, Percent |
2.17%
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1.69%
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1.74%
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| Without Sales Load [Member] | C000001877 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Municipal Opportunities Fund (Class A/TAMBX)—excluding sales charge
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| Average Annual Return, Percent |
2.55%
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1.49%
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2.02%
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| Without Sales Load [Member] | C000001879 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Municipal Opportunities Fund (Class C/TBMBX)—excluding sales charge
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| Average Annual Return, Percent |
1.79%
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0.73%
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1.26%
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| Without Sales Load [Member] | C000236446 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Short Duration Municipal Opportunities Fund (Class A/JHSFX)—excluding sales charge
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| Average Annual Return, Percent |
4.79%
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4.23%
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| Without Sales Load [Member] | C000236447 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Short Duration Municipal Opportunities Fund (Class C/JHSHX)—excluding sales charge
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| Average Annual Return, Percent |
4.12%
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3.45%
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| Bloomberg Municipal Bond Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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| Average Annual Return, Percent |
2.03%
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1.80%
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0.55%
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2.13%
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| Bloomberg Municipal 1 5 Year Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal 1-5 Year Index
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| Average Annual Return, Percent |
4.09%
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2.21%
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| Bloomberg High Yield Municipal Bond Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg High Yield Municipal Bond Index
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| Average Annual Return, Percent |
3.64%
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3.83%
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4.00%
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