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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Objective [Heading] rr_ObjectiveHeading

Investment objective

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

Fees and expenses

Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses you may pay if you buy and hold shares of the fund. 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. More information about these and other discounts is available on pages 15 to 16 of the prospectus under "Sales Charge Reductions and Waivers" or pages 125 to 128 of the fund's statement of additional information under "Initial Sales Charge on Class A Shares."
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption

Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Annual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2014-09-30
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading

Portfolio turnover

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 7% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 7.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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. More information about these and other discounts is available on pages 15 to 16 of the prospectus under "Sales Charge Reductions and Waivers" or pages 125 to 128 of the fund's statement of additional information under "Initial Sales Charge on Class A Shares."
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading

Expense example

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 in the fund for the time periods indicated (Kept column) and then assuming a redemption of all of your shares at the end of those periods (Sold column). The example assumes a 5% average annual return. The example assumes 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 Sold
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Kept
Strategy [Heading] rr_StrategyHeading

Principal investment strategies

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 Standard & Poor's Ratings Services (S&P), Fitch Ratings (Fitch), or Ba by Moody's Investors Service, Inc. (Moody's) or their unrated equivalents. Bonds that are rated at or below BB by S&P or Fitch or Ba by Moody's are considered junk bonds.

The fund may buy bonds of any maturity. If a bond's credit rating falls, the fund does not have to sell it unless the subadvisor determines a sale is in the fund's best interest. The fund is non-diversified and may invest more than 5% of its net assets in securities of any given issuer. The fund may engage in derivative transactions that include futures contracts on debt securities and debt securities indexes; options on futures, debt securities, and debt indexes; and inverse floating rate securities, in each case, for the purposes of reducing risk and/or enhancing investment returns.

The subadvisor looks for bonds that are undervalued, based on both broad and security-specific factors, such as issuer creditworthiness, bond structure, general credit trends, and the relative attractiveness of different types of issuers. The subadvisor uses detailed analysis of an appropriate index to model portfolio performance and composition, then blends the macro assessment with security analysis in a comprehensive and disciplined fashion. The fund does not intend to use frequent trading as part of its strategy.

In general, the subadvisor 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 subadvisor also favors bonds that have limitations on being paid off early (call protection), as this can help minimize the effect that falling interest rates may have on the fund's yield. 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.
Risk [Heading] rr_RiskHeading

Principal risks

Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

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. The fund's shares will go up and down in price, meaning that you could lose money by investing in the fund. Many factors influence a mutual fund's performance.

Instability in the financial markets has led many governments, including the U.S. government, to take a number of unprecedented actions designed to support certain financial institutions and segments of the financial markets that have experienced extreme volatility and, in some cases, a lack of liquidity. Federal, state, and other governments, and their regulatory agencies or self-regulatory organizations, may take actions that affect the regulation of the instruments in which the fund invests, or the issuers of such instruments, in ways that are unforeseeable. Legislation or regulation may also change the way in which the fund itself is regulated. Such legislation or regulation could limit or preclude the fund's ability to achieve its investment objective.

Governments or their agencies may also acquire distressed assets from financial institutions and acquire ownership interests in those institutions. The implications of government ownership and disposition of these assets are unclear, and such a program may have positive or negative effects on the liquidity, valuation, and performance of the fund's portfolio holdings. Furthermore, volatile financial markets can expose the fund to greater market and liquidity risk and potential difficulty in valuing portfolio instruments held by the fund.

The fund's main risk factors are listed below in alphabetical order. Before investing, be sure to read the additional descriptions of these risks beginning on page 6 of the prospectus.

Active management risk. The subadvisor's investment strategy may fail to produce the intended result.

Changing distribution levels risk. The distribution amounts paid by the fund generally depend on the amount of income and/or dividends paid by the fund's investments.

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 a fund's securities may be unable or unwilling to make timely principal, interest, or settlement payments, or otherwise honor its obligations. U.S. government securities are subject to varying degrees of credit risk depending upon the nature of their support. Funds that invest in fixed-income securities are subject to varying degrees of risk that the issuers of the securities will have their credit rating downgraded or will default, potentially reducing a fund's share price and income level.

Economic and market events risk. Events in the financial markets have resulted, and may continue to result, in an unusually high degree of volatility in the financial markets, both domestic and foreign. In addition, reduced liquidity in credit and fixed-income markets may adversely affect issuers worldwide.

Fixed-income securities risk. Fixed-income securities are affected by changes in interest rates and credit quality. A rise in interest rates typically causes bond prices to fall. The longer the average maturity or average duration of the bonds held by the fund, the more sensitive the fund is likely to be to interest-rate changes. There is the possibility that the issuer of the security will not repay all or a portion of the principal borrowed and will not make all interest payments.

Hedging, derivatives, and other strategic transactions risk. Hedging and other strategic transactions may increase the volatility of a fund and, if the transaction is not successful, could result in a significant loss to a fund. The use of derivative instruments could produce disproportionate gains or losses, more than the principal amount invested. Investing in derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments and, in a down market, could become harder to value or sell at a fair price. The following is a list of certain derivatives and other strategic transactions in which the fund intends to invest and the main risks associated with each of them:

Futures contracts. Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), and risk of disproportionate loss are the principal risks of engaging in transactions involving futures contracts. Counterparty risk does not apply to exchange-traded futures.

Inverse floating-rate securities. Liquidity risk (i.e., the inability to enter into closing transactions), interest-rate risk, issuer risk, and risk of disproportionate loss are the principal risks of engaging in transactions involving inverse floating-rate securities.

Options. Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), and risk of disproportionate loss are the principal risks of engaging in transactions involving options. Counterparty risk does not apply to exchange-traded options.

Lower-rated fixed-income securities risk and high-yield securities risk. Lower-rated fixed-income securities and high-yield fixed-income securities (commonly known as junk bonds) are subject to greater credit quality risk and risk of default than higher-rated fixed-income securities. These securities may be considered speculative and the value of these securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell.

Municipal bond risk. Municipal bond prices can decline due to fiscal mismanagement or tax shortfalls. Revenue bond prices can decline if related projects become unprofitable.

The fund may hold bonds that are insured as to principal and interest payments. Because the value of an insured municipal bond depends in part on the claims-paying ability of the insurer, the fund would be subject to the risk that the insurer may be unable to pay claims filed pursuant to the coverage. The fund may hold several investments covered by one insurer, which would increase the fund's exposure to the claims-paying ability of that insurer. In addition, insurance does not guarantee the market value of the insured obligation. Income from municipal bonds held by the fund could become taxable because of changes in tax laws or interpretations by taxing authorities, or noncompliant conduct of a municipal issuer. Values of municipal bonds could be adversely affected by changes in tax rates that make tax-exempt returns less attractive.

Non-diversified risk. Overall risk can be reduced by investing in securities from a diversified pool of issuers and is increased by investing in securities of a small number of issuers. Investments in a non-diversified fund may magnify the fund's losses from adverse events affecting a particular issuer.

Sector investing risk. Because the fund may focus on a single sector of the economy, its performance depends in large part on the performance of that sector. As a result, the value of your investment may fluctuate more widely than it would in a fund that is diversified across sectors.

State-specific risk. Because the fund invests mainly in bonds from a single state, its performance is affected by local, state, and regional factors. These factors may include economic or political changes, tax base erosion, state constitutional limits on tax increases, budget deficits and other financial difficulties, and changes in the credit ratings assigned to the state's municipal issuers. Historically, California's economy has been more volatile than that of the nation as a whole. The state's economy is relatively diverse, with key drivers being international trade, technology production, tourism, finance, defense, and construction.
Risk Lose Money [Text] rr_RiskLoseMoney The fund's shares will go up and down in price, meaning that you could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Non-diversified risk. Overall risk can be reduced by investing in securities from a diversified pool of issuers and is increased by investing in securities of a small number of issuers. Investments in a non-diversified fund may magnify the fund's losses from adverse events affecting a particular issuer.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information in the bar chart and table below 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.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex Average annual total returns. Performance of a broad-based market index is included for comparison.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-225-5291
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.jhinvestments.com/FundPerformance
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

Past performance

Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following performance information in the bar chart and table below 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. However, past performance (before and after taxes) does not indicate future results. All figures assume dividend reinvestment. Performance for the fund is updated daily, monthly, and quarterly and may be obtained at our website: www.jhinvestments.com/FundPerformance, or by calling 800-225-5291, Monday–Thursday, between 8:00 A.M. and 7:00 P.M., and on Fridays between 8:00 A.M. and 6:00 P.M., Eastern time.

Calendar year total returns. These do not include sales charges and would have been lower if they did. Calendar year total returns are shown only for Class A shares and would be different for other share classes.

Average annual total returns. Performance of a broad-based market index is included for comparison.

After-tax returns. These are shown only for Class A shares and would be different for other classes. They reflect the highest individual federal marginal income-tax rates 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.

Barclays California Municipal Bond Index is an unmanaged index composed of California investment-grade municipal bonds.

Barclays Municipal Bond Index is an unmanaged index representative of the tax-exempt bond market.
Bar Chart [Heading] rr_BarChartHeading

Calendar year total returns—Class A (%)

Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock 
Year-to-date total return.  The fund's total return for the six months ended June 30, 2013, was -1.70%.
Best quarter:  Q3 '09, 11.25%
Worst quarter: Q4 '08, -7.20%
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Calendar year total returns. These do not include sales charges and would have been lower if they did.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture However, past performance (before and after taxes) does not indicate future results.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate They reflect the highest individual federal marginal income tax rates in effect as of the date provided and do not reflect any state or local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred 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.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns. These are shown only for Class A shares and would be different for other classes.
Performance Table Heading rr_PerformanceTableHeading

Average annual total returns (%) as of 12-31-12

Barclays California Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.14% [1]
5 Years rr_AverageAnnualReturnYear05 6.10% [1]
10 Years rr_AverageAnnualReturnYear10 5.29% [1]
Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.78% [1]
5 Years rr_AverageAnnualReturnYear05 5.91% [1]
10 Years rr_AverageAnnualReturnYear10 5.10% [1]
Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther 4.50%
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther 1.00% [2]
Small account fee (for fund account balances under $1,000) rr_ShareholderFeeOther 20
Management fee rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other expenses rr_OtherExpensesOverAssets 0.14%
Total annual fund operating expenses rr_ExpensesOverAssets 0.84%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 532
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 706
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 895
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,440
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 532
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 706
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 895
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,440
Annual Return 2003 rr_AnnualReturn2003 3.94%
Annual Return 2004 rr_AnnualReturn2004 4.46%
Annual Return 2005 rr_AnnualReturn2005 4.12%
Annual Return 2006 rr_AnnualReturn2006 5.03%
Annual Return 2007 rr_AnnualReturn2007 1.38%
Annual Return 2008 rr_AnnualReturn2008 (11.87%)
Annual Return 2009 rr_AnnualReturn2009 18.12%
Annual Return 2010 rr_AnnualReturn2010 3.23%
Annual Return 2011 rr_AnnualReturn2011 12.05%
Annual Return 2012 rr_AnnualReturn2012 9.60%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date total return. The fund's total return for the six months ended June 30, 2013, was -1.70%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2013
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (1.70%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter: Q3 '09, 11.25%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.25%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter: Q4 '08, -7.20%
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.20%)
1 Year rr_AverageAnnualReturnYear01 4.65%
5 Years rr_AverageAnnualReturnYear05 4.74%
10 Years rr_AverageAnnualReturnYear10 4.26%
Class A | After tax on distributions
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.63%
5 Years rr_AverageAnnualReturnYear05 4.73%
10 Years rr_AverageAnnualReturnYear10 4.25%
Class A | After tax on distributions, with sale
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.50%
5 Years rr_AverageAnnualReturnYear05 4.68%
10 Years rr_AverageAnnualReturnYear10 4.26%
Class B
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther 5.00%
Small account fee (for fund account balances under $1,000) rr_ShareholderFeeOther 20
Management fee rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.90% [3]
Other expenses rr_OtherExpensesOverAssets 0.14%
Total annual fund operating expenses rr_ExpensesOverAssets 1.59%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 823
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,108
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,763
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 162
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 523
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 908
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,763
1 Year rr_AverageAnnualReturnYear01 3.78%
5 Years rr_AverageAnnualReturnYear05 4.51%
10 Years rr_AverageAnnualReturnYear10 4.03%
Class C
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther 1.00%
Small account fee (for fund account balances under $1,000) rr_ShareholderFeeOther 20
Management fee rr_ManagementFeesOverAssets 0.55%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.90% [3]
Other expenses rr_OtherExpensesOverAssets 0.14%
Total annual fund operating expenses rr_ExpensesOverAssets 1.59%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 262
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 523
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 908
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,989
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 162
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 523
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 908
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,989
1 Year rr_AverageAnnualReturnYear01 7.78%
5 Years rr_AverageAnnualReturnYear05 4.84%
10 Years rr_AverageAnnualReturnYear10 3.87%
[1] Prior to December 14, 2012, the fund compared its performance solely to the Barclays Municipal Bond Index. After this date, the fund added the Barclays California Municipal Bond Index as the primary benchmark index and retained the Barclays Municipal Bond Index as the secondary benchmark index to which the fund compares its performance to better reflect the universe of investment opportunities based on the fund's investment strategy.
[2] (on certain purchases, including those of $1 million or more)
[3] The fund's distributor has contractually agreed to waive 0.10% of Rule 12b-1 fees for Class B and Class C shares. The current waiver agreement expires on September 30, 2014, 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. Excluding this waiver would result in Rule 12b-1 fees of 1.00% for Class B and 1.00% for Class C shares.