Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	John Hancock California Tax-Free Income Fund
Prospectus Date	rr_ProspectusDate	Oct. 01, 2024
Classes A C I and R6 | John Hancock California Municipal Bond Fund
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:24pt;">John Hancock California Municipal Bond Fund</span>
Objective [Heading]	rr_ObjectiveHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Investment objective</span>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	To seek a high level of current income, consistent with preservation of capital, that is exempt from federal and California personal income taxes.
Expense [Heading]	rr_ExpenseHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Fees and expenses</span>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses you may pay if you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $100,000 in the John Hancock family of funds.Intermediaries may have different policies and procedures regarding the availability of front-end sales charge waivers or contingent deferred sales charge (CDSC) waivers (See Appendix 1 - Intermediary sales charge waivers, which includes information about specific sales charge waivers applicable to the intermediaries identified therein). More information about these and other discounts is available from your financial professional and beginning on page 21 of the prospectus under “Sales charge reductions and waivers” or page 113 of the fund’s Statement of Additional Information under “Sales Charges on Class A and Class C Shares.”
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Shareholder fees (%) </span><span style="color:#000000;font-family:Arial Narrow;font-size:8pt;margin-left:0.0pt;">(fees paid directly from your investment)</span>
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Annual fund operating expenses (%) </span><span style="color:#000000;font-family:Arial Narrow;font-size:8pt;margin-left:0.0pt;">(expenses that you pay each year as a percentage of the value of your </span><span style="color:#000000;font-family:Arial Narrow;font-size:8pt;margin-left:0.0pt;">investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;">September 30, 2025</span><span style="color:#000000;font-family:Arial Narrow;font-size:8pt;">July 31, 2026</span><span style="color:#000000;font-family:Arial Narrow;font-size:8pt;">September 30, 2025</span>
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Portfolio turnover</span>
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During its most recent fiscal year, the fund’s portfolio turnover rate was 44% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	44.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">You may qualify for sales </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">100,000</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;"> in the John Hancock family of funds.</span>
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 100,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;">“Other expenses” have been restated from fiscal year amounts to reflect current fees and expenses.</span>
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]	rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;">The “Total annual fund operating expenses” shown may not correlate to the fund’s ratios of expenses to average daily net assets shown in the “Financial highlights” section of the fund’s prospectus, which does not include “Acquired fund fees and expenses.”</span>
Expense Example [Heading]	rr_ExpenseExampleHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Expense example</span>
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. Please see below a hypothetical example showing the expenses of a $10,000 investment for the time periods indicated and then, except as shown below, assuming you sell all of your shares at the end of those periods. The example assumes a 5% average annual return and that fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Shares Sold</span>
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Shares</span><span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Not Sold</span>
Strategy [Heading]	rr_StrategyHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal investment strategies</span>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the fund invests at least 80% of its net assets, plus amounts borrowed for investment purposes, in securities of any maturity exempt from federal and California personal income taxes. Most of these securities are investment-grade when purchased, but the fund may invest up to 20% of its net assets in junk bonds rated BB by S&P Global Ratings (S&P) or Fitch Ratings, Inc. (Fitch Ratings) or Ba by Moody’s Investors Service, Inc. (Moody’s), or their unrated equivalents. The fund’s investment policies are based on credit ratings at the time of purchase.The fund may buy bonds of any maturity. The fund may engage in derivative transactions. Derivatives may be used to reduce risk and/or enhance investment returns, and may include futures contracts on debt securities and debt securities indexes; options on futures, debt securities, and debt indexes; and inverse floating-rate securities. The fund may also use tender option bond transactions to seek to enhance potential gains. The fund will look through to the underlying municipal bonds held by a tender option bond trust for purposes of the fund’s 80% policy. The fund may leverage its assets through the use of proceeds received as a result of tender option bond transactions. The fund may contribute up to 15% of its holdings in municipal securities to tender option bond transactions.The manager looks for undervalued bonds, based on both broad and security-specific factors, such as issuer creditworthiness, bond structure, and general credit trends, and uses detailed analysis of an appropriate index to model portfolio performance and composition.The fund may invest in general obligation bonds, however, in general, the manager favors bonds backed by revenue from a specific public project or facility, such as a power plant (revenue bonds), as they tend to offer higher yields than general obligation bonds. The manager also favors bonds that have limitations on early payoff (call protection), which can help minimize the potential effect of falling interest rates on the fund’s yield. The manager may implement short-term trading strategies to take advantage of pricing imbalances within the municipal bond market. To the extent that the fund invests in bonds that are subject to the alternative minimum tax (AMT), the income paid by the fund may not be entirely tax-free to all investors. Investments in bonds subject to the AMT will not be counted toward the fund’s 80% investment policy.For liquidity and flexibility, the fund may invest up to 20% of its net assets (plus any borrowings for investment purposes) in taxable and tax-free investment-grade short-term securities.
Risk [Heading]	rr_RiskHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal risks</span>
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Past performance</span>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following information illustrates the variability of the fund’s returns and provides some indication of the risks of investing in the fund by showing changes in the fund’s performance from year to year and by showing how the fund’s average annual returns compared with a broad-based securities market index. Past performance (before and after taxes) does not indicate future results. The Bloomberg California Municipal Bond Index shows how the fund’s performance compares against the returns of similar investments. All figures assume dividend reinvestment. Performance information is updated daily, monthly, and quarterly and may be obtained at our website, jhinvestments.com, or by calling 800-225-5291 (Class A and Class C), Monday to Thursday, 8:00 a.m.—7:00 p.m., and Friday, 8:00 a.m.—6:00 p.m., Eastern time, or 888-972-8696 (Class I and Class R6) between 8:30 a.m. and 5:00 p.m., Eastern time, on most business days.A note on performanceClass A, Class I, and Class R6 shares commenced operations on December 29, 1989, February 13, 2017, and August 30, 2017, respectively. Returns shown prior to a class’s commencement date are those of Class A shares, except that they do not include sales charges and would be lower if they did. Returns for Class I and Class R6 shares would have been substantially similar to returns of Class A shares because each share class is invested in the same portfolio of securities and returns would differ only to the extent that expenses of the classes are different. To the extent expenses of a class would have been higher than expenses of Class A shares for the periods shown, performance would have been lower.Please note that after-tax returns (shown for Class A shares only) reflect the highest individual federal marginal income-tax rate in effect as of the date provided and do not reflect any state or local taxes. Your actual after-tax returns may be different. After-tax returns are not relevant to shares held in an IRA, 401(k), or other tax-advantaged investment plan. After-tax returns for other share classes would vary. The returns for Class A shares have been adjusted to reflect the reduction in the maximum sales charge from 4.50% to 4.00%, effective  February 3, 2014.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">The following information illustrates the variability of the fund’s returns and provides some indication of the risks of investing in the fund by showing changes in the fund’s performance from year to year and by showing how the fund’s average annual returns compared with a broad-based securities </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">market index. </span>
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">800-225-5291 (Class A and Class C), </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">Monday to Thursday, 8:00</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">a.m.</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">—7:00</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">p.m.</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">, and Friday, 8:00</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">a.m.</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">—6:00</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">p.m.</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">, Eastern time, or 888-972-8696 (Class I and Class R6) between 8:30</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">a.m.</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;"> and 5:00</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">p.m.</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">, Eastern time, on most business days.</span>
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">jhinvestments.com</span>
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">Past performance (before and after taxes) does not indicate future results.</span>
Bar Chart [Heading]	rr_BarChartHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;font-weight:bold;">Calendar year total returns (%)—Class A </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">(</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">sales charges are not reflected in the bar chart and returns would have been lower if they were</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">)</span>
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">sales charges are not reflected in the bar chart and returns would have been lower if they were</span>
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Year-to-date total return through:Q2 20240.92%Best quarter:Q4 20239.90%Worst quarter:Q1 2022-5.27%
Performance Table Heading	rr_PerformanceTableHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Average annual total returns (%)—as of 12/31/2023</span>
Performance Table Market Index Changed	rr_PerformanceTableMarketIndexChanged	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;">The fund has designated the Bloomberg Municipal Bond Index as its new broad-based securities market index in accordance with the revised definition for such an index.</span>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">Please note that after-tax returns (shown for Class A shares only)</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;"> reflect the highest individual federal marginal income-tax rate in effect as of the date </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">provided and do not reflect any state or local taxes.</span>
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;"> Your actual after-tax returns may be different. After-tax returns are not relevant to shares held in an </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">IRA, 401(k), or other tax-advantaged investment plan.</span>
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">Please note that after-tax returns (shown for Class A shares only)</span>
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Risk Lose Money [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Many factors affect performance, and fund shares will fluctuate in price, meaning you could lose money.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Risk Not Insured Depository Institution [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Changing Distribution Levels Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Changing distribution levels risk. The fund may cease or reduce the level of its distribution if income or dividends paid from its investments declines.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Credit And Counterparty Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Credit and counterparty risk. The issuer or guarantor of a fixed-income security, the counterparty to an over-the-counter derivatives contract, or a borrower of fund securities may not make timely payments or otherwise honor its obligations. A downgrade or default affecting any of the fund’s securities could affect the fund’s performance.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Economic And Market Events Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Economic and market events risk. Events in the U.S. and global financial markets, including actions taken by the U.S. Federal Reserve or foreign central banks to stimulate or stabilize economic growth, may at times result in unusually high market volatility, which could negatively impact performance. Reduced liquidity in credit and fixed-income markets could adversely affect issuers worldwide. Banks and financial services companies could suffer losses if interest rates rise or economic conditions deteriorate.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Fixed Income Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Fixed-income securities risk. A rise in interest rates typically causes bond prices to fall. The longer the average maturity or duration of the bonds held by a fund, the more sensitive it will likely be to interest-rate fluctuations. An issuer may not make all interest payments or repay all or any of the principal borrowed. Changes in a security’s credit quality may adversely affect fund performance.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Hedging Derivatives And Other Strategic Transactions Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Hedging, derivatives, and other strategic transactions risk. Hedging, derivatives, and other strategic transactions may increase a fund’s volatility and could produce disproportionate losses, potentially more than the fund’s principal investment. Risks of these transactions are different from and possibly greater than risks of investing directly in securities and other traditional instruments. Under certain market conditions, derivatives could become harder to value or sell and may become subject to liquidity risk (i.e., the inability to enter into closing transactions). Derivatives and other strategic transactions that the fund intends to utilize include: futures contracts; inverse floating-rate securities; options on futures; and options. Futures contracts and options generally are subject to counterparty risk.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | High Portfolio Turnover Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	High portfolio turnover risk. Trading securities actively and frequently can increase transaction costs (thus lowering performance) and taxable distributions.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Liquidity Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Liquidity risk. The extent (if at all) to which a security may be sold or a derivative position closed without negatively impacting its market value may be impaired by reduced market activity or participation, legal restrictions, or other economic and market impediments. Liquidity risk may be magnified in rising interest rate environments due to higher than normal redemption rates. Widespread selling of fixed-income securities to satisfy redemptions during periods of reduced demand may adversely impact the price or salability of such securities. Periods of heavy redemption could cause the fund to sell assets at a loss or depressed value, which could negatively affect performance. Redemption risk is heightened during periods of declining or illiquid markets. The secondary market for certain tax-exempt securities tends to be less well-developed or liquid than many other securities markets, which may result in increased volatility or liquidity risk.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Lower Rated And High Yield Fixed Income Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Lower-rated and high-yield fixed-income securities risk. Lower-rated and high-yield fixed-income securities (junk bonds) are subject to greater credit quality risk, risk of default, and price volatility than higher-rated fixed-income securities, may be considered speculative, and can be difficult to resell.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Municipal Bond Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Municipal bond risk. The prices of municipal bonds, including general obligation bonds, can decline if the issuer’s credit quality declines. Revenue bond prices can decline if related projects become unprofitable. An insured municipal bond is subject to the risk that the insurer may be unable to pay claims and is not insured with respect to the market value of the obligation. Municipal bond income could become taxable in the future. Investments in bonds subject to the alternative minimum tax may result in tax liability for shareholders.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Operational And Cybersecurity Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Operational and cybersecurity risk. Cybersecurity breaches may allow an unauthorized party to gain access to fund assets, customer data, or proprietary information, or cause a fund or its service providers to suffer data corruption or lose operational functionality. Similar incidents affecting issuers of a fund’s securities may negatively impact performance. Operational risk may arise from human error, error by third parties, communication errors, or technology failures, among other causes.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Sector Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Sector risk. When a fund focuses its investments in certain sectors of the economy, its performance may be driven largely by sector performance and could fluctuate more widely than if the fund were invested more evenly across sectors.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | State Region Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	State/region risk. Investing heavily in any one state or region increases exposure to losses in that state or region. This risk is magnified for a fund that invests mainly in bonds from a single state. Factors that may affect performance include economic or political changes, tax base erosion, state constitutional limits on tax increases, budget deficits and other financial difficulties, and changes in credit ratings. At times, California has been more economically volatile than the United States as a whole. Puerto Rican municipal obligations, in which the fund may invest, may be subject to further devaluation due to adverse political, economic, and market conditions.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Tender Option Bonds Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Tender option bonds risk. The fund’s participation in tender option bond transactions may increase volatility and/or reduce the fund’s returns. Tender option bond transactions create leverage. Leverage magnifies returns, both positive and negative, and risk by magnifying the volatility of returns. An investment in a tender option bond transaction typically involves greater risk than investing in the underlying municipal fixed rate bonds, including the risk of loss of principal.
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Class A
Risk Return Abstract	rr_RiskReturnAbstract
Maximum front-end sales charge (load) on purchases, as a % of purchase price	rr_MaximumCumulativeSalesChargeOverOfferingPrice	4.00%
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Small account fee (for fund account balances under $1,000) ($)	rr_MaximumAccountFee	$ 20
Management fee	rr_ManagementFeesOverAssets	0.51%
Distribution and service (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.15%
Other expenses	rr_OtherExpensesOverAssets	0.23%	[1],[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.02%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.91%	[4]
Contractual expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.17%)	[5]
Total annual fund operating expenses after expense reimbursements	rr_NetExpensesOverAssets	0.74%
1 year	rr_ExpenseExampleYear01	$ 473
3 years	rr_ExpenseExampleYear03	662
5 years	rr_ExpenseExampleYear05	868
10 years	rr_ExpenseExampleYear10	$ 1,460
2014	rr_AnnualReturn2014	11.18%
2015	rr_AnnualReturn2015	3.18%
2016	rr_AnnualReturn2016	(0.01%)
2017	rr_AnnualReturn2017	6.10%
2018	rr_AnnualReturn2018	0.42%
2019	rr_AnnualReturn2019	7.44%
2020	rr_AnnualReturn2020	3.69%
2021	rr_AnnualReturn2021	2.53%
2022	rr_AnnualReturn2022	(8.65%)
2023	rr_AnnualReturn2023	8.22%
Year to Date Return, Label	rr_YearToDateReturnLabel	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Year-to-date total return through:</span>
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2024
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	0.92%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Best quarter:</span>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2023
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	9.90%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Worst quarter:</span>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2022
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(5.27%)
1 year	rr_AverageAnnualReturnYear01	3.91%
5 year	rr_AverageAnnualReturnYear05	1.63%
10 year	rr_AverageAnnualReturnYear10	2.86%
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Class C
Risk Return Abstract	rr_RiskReturnAbstract
Maximum front-end sales charge (load) on purchases, as a % of purchase price	rr_MaximumCumulativeSalesChargeOverOfferingPrice	none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Small account fee (for fund account balances under $1,000) ($)	rr_MaximumAccountFee	$ 20
Management fee	rr_ManagementFeesOverAssets	0.51%
Distribution and service (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.23%	[1],[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.02%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.76%	[4]
Contractual expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.27%)	[5],[6]
Total annual fund operating expenses after expense reimbursements	rr_NetExpensesOverAssets	1.49%
1 year	rr_ExpenseExampleYear01	$ 252
3 years	rr_ExpenseExampleYear03	528
5 years	rr_ExpenseExampleYear05	929
10 years	rr_ExpenseExampleYear10	1,826
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	152
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	528
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	929
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,826
1 year	rr_AverageAnnualReturnYear01	6.30%
5 year	rr_AverageAnnualReturnYear05	1.68%
10 year	rr_AverageAnnualReturnYear10	2.49%
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Class I
Risk Return Abstract	rr_RiskReturnAbstract
Maximum front-end sales charge (load) on purchases, as a % of purchase price	rr_MaximumCumulativeSalesChargeOverOfferingPrice	none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Small account fee (for fund account balances under $1,000) ($)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.51%
Distribution and service (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.23%	[1],[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.02%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.76%	[4]
Contractual expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.17%)	[5]
Total annual fund operating expenses after expense reimbursements	rr_NetExpensesOverAssets	0.59%
1 year	rr_ExpenseExampleYear01	$ 60
3 years	rr_ExpenseExampleYear03	226
5 years	rr_ExpenseExampleYear05	406
10 years	rr_ExpenseExampleYear10	$ 926
1 year	rr_AverageAnnualReturnYear01	8.27%
5 year	rr_AverageAnnualReturnYear05	2.60%
10 year	rr_AverageAnnualReturnYear10	3.38%
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Maximum front-end sales charge (load) on purchases, as a % of purchase price	rr_MaximumCumulativeSalesChargeOverOfferingPrice	none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Small account fee (for fund account balances under $1,000) ($)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.51%
Distribution and service (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.16%	[1]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.02%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.69%	[4]
Contractual expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.17%)	[5]
Total annual fund operating expenses after expense reimbursements	rr_NetExpensesOverAssets	0.52%
1 year	rr_ExpenseExampleYear01	$ 53
3 years	rr_ExpenseExampleYear03	204
5 years	rr_ExpenseExampleYear05	367
10 years	rr_ExpenseExampleYear10	$ 843
1 year	rr_AverageAnnualReturnYear01	8.39%
5 year	rr_AverageAnnualReturnYear05	2.64%
10 year	rr_AverageAnnualReturnYear10	3.39%
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Return After Taxes on Distributions | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.90%
5 year	rr_AverageAnnualReturnYear05	1.53%
10 year	rr_AverageAnnualReturnYear10	2.79%
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Return After Taxes on Distributions and Sale of Shares | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	3.65%
5 year	rr_AverageAnnualReturnYear05	1.93%
10 year	rr_AverageAnnualReturnYear10	2.95%
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Bloomberg Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	6.40%	[7]
5 year	rr_AverageAnnualReturnYear05	2.25%	[7]
10 year	rr_AverageAnnualReturnYear10	3.03%	[7]
Classes A C I and R6 | John Hancock California Municipal Bond Fund | Bloomberg California Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	6.22%
5 year	rr_AverageAnnualReturnYear05	2.25%
10 year	rr_AverageAnnualReturnYear10	3.10%

[1] Includes interest expenses in the amount of 0.06%.

[2] “Other expenses” have been restated from fiscal year amounts to reflect current fees and expenses.

[3] “Acquired fund fees and expenses” are based on indirect net expenses associated with the fund’s investments in underlying investment companies.

[4] The “Total annual fund operating expenses” shown may not correlate to the fund’s ratios of expenses to average daily net assets shown in the “Financial highlights” section of the fund’s prospectus, which does not include “Acquired fund fees and expenses.”

[5] The advisor contractually agrees to reduce its management fee or, if necessary, make payment to the fund in an amount equal to the amount by which expenses of the fund exceed 0.43% of average daily net assets of the fund. For purposes of this agreement, “expenses of the fund” means all fund expenses, excluding (a) taxes, (b) brokerage commissions, (c) interest expense, (d) litigation and indemnification expenses and other extraordinary expenses not incurred in the ordinary course of the fund’s business, (e) class-specific expenses, (f) borrowing costs, (g) prime brokerage fees, (h) acquired fund fees and expenses paid indirectly, and (i) short dividend expense. This agreement expires on September 30, 2025, unless renewed by mutual agreement of the advisor and the fund based upon a determination that this is appropriate under the circumstances at that time. The advisor also contractually agrees to waive a portion of its management fee and/or reimburse expenses for the fund and certain other John Hancock funds according to an asset level breakpoint schedule that is based on the aggregate net assets of all the funds participating in the waiver or reimbursement, including the fund (the participating portfolios). This waiver equals, on an annualized basis, 0.0100% of that portion of the aggregate net assets of all the participating portfolios that exceeds $75 billion but is less than or equal to $125 billion; 0.0125% of that portion of the aggregate net assets of all the participating portfolios that exceeds $125 billion but is less than or equal to $150 billion; 0.0150% of that portion of the aggregate net assets of all the participating portfolios that exceeds $150 billion but is less than or equal to $175 billion; 0.0175% of that portion of the aggregate net assets of all the participating portfolios that exceeds $175 billion but is less than or equal to $200 billion; 0.0200% of that portion of the aggregate net assets of all the participating portfolios that exceeds $200 billion but is less than or equal to $225 billion; and 0.0225% of that portion of the aggregate net assets of all the participating portfolios that exceeds $225 billion. The amount of the reimbursement is calculated daily and allocated among all the participating portfolios in proportion to the daily net assets of each participating portfolio. During its most recent fiscal year, the fund’s reimbursement amounted to 0.01% of the fund’s average daily net assets. This agreement expires on July 31, 2026, unless renewed by mutual agreement of the fund and the advisor based upon a determination that this is appropriate under the circumstances at that time.

[6] The distributor contractually agrees to limit its Rule 12b-1 fees for Class C shares to 0.90%. This agreement expires on September 30, 2025, unless renewed by mutual agreement of the fund and the distributor based upon a determination that this is appropriate under the circumstances at that time.

[7] The fund has designated the Bloomberg Municipal Bond Index as its new broad-based securities market index in accordance with the revised definition for such an index.