Shareholder Report, Line Graph (Details) - USD ($) |
12 Months Ended | 24 Months Ended | 36 Months Ended | 48 Months Ended | 60 Months Ended | 72 Months Ended | 84 Months Ended | 96 Months Ended | 108 Months Ended | 120 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 09, 2022 |
May 31, 2015 |
May 31, 2025 |
May 31, 2023 |
May 31, 2016 |
May 31, 2024 |
May 31, 2017 |
May 31, 2025 |
May 31, 2018 |
May 31, 2019 |
May 31, 2020 |
May 31, 2021 |
May 31, 2022 |
May 31, 2023 |
May 31, 2024 |
May 31, 2025 |
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| C000001874 [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | High Yield Municipal Bond Fund (Class A/JHTFX) | |||||||||||||||
| Accumulated Value | $ 9,600 | $ 10,238.08032 | $ 10,315.485121 | $ 10,681.75767 | $ 11,321.922457 | $ 10,891.670043 | $ 12,724.827205 | $ 11,575.721355 | $ 11,135.17151 | $ 11,947.489844 | $ 12,298.607813 | |||||
| C000001876 [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | High Yield Municipal Bond Fund (Class C/JCTFX) | |||||||||||||||
| Accumulated Value | 10,000 | 10,585.3148 | 10,585.760018 | 10,879.941465 | 11,446.134598 | 10,928.930247 | 12,673.338334 | 11,442.404103 | 10,924.322596 | 11,633.8745 | 11,886.630429 | |||||
| C000193018 [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | High Yield Municipal Bond Fund (Class R6/JCTRX) | |||||||||||||||
| Accumulated Value | 1,000,000 | 1,066,466.7 | 1,074,529.700156 | 1,114,143.548478 | 1,184,492.310193 | 1,141,743.982718 | 1,335,908.987254 | 1,217,881.695412 | 1,173,782.040897 | 1,259,524.177975 | 1,301,166.289252 | |||||
| C000178765 [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | High Yield Municipal Bond Fund (Class I/JHYMX) | |||||||||||||||
| Accumulated Value | 250,000 | 266,616.675 | 269,055.09512 | 278,990.516832 | 296,147.658024 | 285,350.502366 | 333,825.851415 | 304,184.546062 | 293,083.991134 | 314,921.852233 | 324,667.921449 | |||||
| C000001877 [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | Municipal Opportunities Fund (Class A/TAMBX) | |||||||||||||||
| Accumulated Value | 9,600 | 10,112.097792 | 10,146.229762 | 10,310.589654 | 10,882.713138 | 10,892.7618 | 11,910.284417 | 11,083.38255 | 11,035.052241 | 11,436.404264 | 11,728.555331 | |||||
| C000193019 [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | Municipal Opportunities Fund (Class R6/JTMRX) | |||||||||||||||
| Accumulated Value | 1,000,000 | 1,053,343.52 | 1,056,898.933584 | 1,075,645.202814 | 1,137,267.711761 | 1,140,420.843355 | 1,247,845.555917 | 1,164,711.052717 | 1,160,377.116301 | 1,205,892.827462 | 1,237,844.815001 | |||||
| C000178766 [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | Municipal Opportunities Fund (Class I/JTBDX) | |||||||||||||||
| Accumulated Value | 250,000 | 263,335.88 | 264,584.402808 | 269,275.7515 | 284,636.182831 | 285,630.866743 | 312,434.844311 | 291,524.845542 | 290,383.347942 | 301,396.223528 | 309,558.355755 | |||||
| C000001879 [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | Municipal Opportunities Fund (Class C/TBMBX) | |||||||||||||||
| Accumulated Value | 10,000 | 10,455.018 | 10,411.98661 | 10,501.681606 | 11,001.911041 | 10,930.017073 | 11,850.168539 | 10,955.585333 | 10,825.951288 | 11,135.879003 | 11,335.118253 | |||||
| C000236446 [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | Short Duration Municipal Opportunities Fund (Class A/JHSFX) | |||||||||||||||
| Accumulated Value | $ 9,775 | $ 9,939.206706 | $ 10,551.400216 | $ 11,057.123658 | ||||||||||||
| C000236447 [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | Short Duration Municipal Opportunities Fund (Class C/JHSHX) | |||||||||||||||
| Accumulated Value | 10,000 | 10,094.3191 | 10,625.833857 | 11,063.506959 | ||||||||||||
| C000236448 [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | Short Duration Municipal Opportunities Fund (Class I/JHSJX) | |||||||||||||||
| Accumulated Value | 250,000 | 254,564.9075 | 270,645.345038 | 284,320.412893 | ||||||||||||
| C000236445 [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | Short Duration Municipal Opportunities Fund (Class R6/JHSKX) | |||||||||||||||
| Accumulated Value | 1,000,000 | 1,018,431.84 | 1,082,917.569226 | 1,138,273.174904 | ||||||||||||
| Bloomberg Municipal Bond C000178765 Index [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Accumulated Value | 250,000 | 264,678.0175 | 268,540.040325 | 271,531.64888 | 288,921.249803 | 300,414.808706 | 314,640.555425 | 293,263.759672 | 294,701.752124 | 302,578.575919 | 308,713.889084 | |||||
| Bloomberg Municipal Bond C000193018 Index [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Accumulated Value | 1,000,000 | 1,058,712.07 | 1,074,160.161298 | 1,086,126.595518 | 1,155,684.999208 | 1,201,659.23482 | 1,258,562.221695 | 1,173,055.038685 | 1,178,807.008492 | 1,210,314.303672 | 1,234,855.556332 | |||||
| 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 | 10,067.2179 | 10,587.1207 | 10,336.295708 | 10,741.601613 | 10,545.882295 | 10,861.265955 | 11,556.849992 | 12,016.592348 | 12,585.622217 | 11,730.550387 | 11,788.070085 | 12,103.143037 | 12,348.555564 | |
| Bloomberg Municipal Bond C000178766 Index [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Accumulated Value | 250,000 | 264,678.0175 | 268,540.040325 | 271,531.64888 | 288,921.249803 | 300,414.808706 | 314,640.555425 | 293,263.759672 | 294,701.752124 | 302,578.575919 | 308,713.889084 | |||||
| Bloomberg Municipal Bond C000193019 Index [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Accumulated Value | 1,000,000 | 1,058,712.07 | 1,074,160.161298 | 1,086,126.595518 | 1,155,684.999208 | 1,201,659.23482 | 1,258,562.221695 | 1,173,055.038685 | 1,178,807.008492 | 1,210,314.303672 | 1,234,855.556332 | |||||
| Bloomberg Municipal Bond C000236445 Index [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Accumulated Value | 1,000,000 | 1,006,721.79 | 1,033,629.57081 | 1,054,588.229546 | ||||||||||||
| Bloomberg Municipal Bond C000236448 Index [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Accumulated Value | 250,000 | 251,680.4475 | 258,407.392702 | 263,647.057386 | ||||||||||||
| Bloomberg Municipal 1 5 Year Index [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal 1-5 Year Index | |||||||||||||||
| Accumulated Value | 10,000 | 9,999.5256 | 10,252.634992 | 10,671.888715 | ||||||||||||
| Bloomberg Municipal 1 5 Year C000236445 Index [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Accumulated Value | 1,000,000 | 999,952.56 | 1,025,263.499192 | 1,067,188.871527 | ||||||||||||
| Bloomberg Municipal 1 5 Year C000236448 Index [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Accumulated Value | $ 250,000 | $ 249,988.14 | $ 256,315.874798 | $ 266,797.217882 | ||||||||||||
| Bloomberg High Yield Municipal Bond Index [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg High Yield Municipal Bond Index | |||||||||||||||
| Accumulated Value | 10,000 | 10,470.4617 | 10,952.00839 | 11,650.365176 | 12,554.61992 | 12,263.777837 | 14,394.249049 | 13,491.4144 | 13,199.0530209999 | 14,279.828968 | 14,799.449096 | |||||
| Bloomberg High Yield Municipal Bond C000178765 Index [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Accumulated Value | 250,000 | 261,761.5425 | 273,800.209748 | 291,259.129407 | 313,865.497995 | 306,594.445927 | 359,856.226228 | 337,285.359992 | 329,976.32553 | 356,995.724197 | 369,986.227407 | |||||
| Bloomberg High Yield Municipal Bond C000193018 Index [Member] | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Accumulated Value | $ 1,000,000 | $ 1,047,046.17 | $ 1,095,200.838993 | $ 1,165,036.517628 | $ 1,255,461.99198 | $ 1,226,377.783709 | $ 1,439,424.904913 | $ 1,349,141.43997 | $ 1,319,905.30212 | $ 1,427,982.896789 | $ 1,479,944.909631 | |||||