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Label Element Value
(John Hancock Government Income Fund)  
Prospectus: rr_ProspectusTable  
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. Maintaining a stable share price is a secondary goal.
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.
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 September 30, 2017
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates "Other expenses" have been estimated for the first year of operations of the fund's Class I shares.
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 for the time periods indicated and then 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:
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 60% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 60.00%
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 any borrowings for investment purposes) in obligations issued or guaranteed by the U.S. government and its agencies, authorities, or instrumentalities (U.S. government securities). There is no limit on the fund's average maturity. U.S. government securities may be supported by:

  • the full faith and credit of the U.S. government, such as U.S. Treasury bills, notes, and bonds, and Government National Mortgage Association Certificates.

  • the right of the issuer to borrow from the U.S. Treasury, such as obligations of the Federal Home Loan Mortgage Corporation.

  • the credit of the instrumentality, such as obligations of the Federal National Mortgage Association.

The fund may invest up to 10% of its total assets in below-investment-grade fixed-income securities (junk bonds) rated Ba and below by Moody's Investors Service, Inc. (Moody's) or BB and below by Standard & Poor's Ratings Services (S&P). However, the fund may not invest in a fixed-income security rated lower than B by any two nationally recognized statistical rating organizations (NRSROs). The fund may invest in higher-risk securities, including U.S. dollar-denominated foreign government securities and asset-backed securities. Although the fund generally invests in foreign government securities rated within the four highest categories by an NRSRO, or their unrated equivalents, it may invest up to 10% of its assets in foreign government junk bonds rated as low as B and their unrated equivalents. The fund's investment policies are based on credit ratings at the time of purchase.

The manager considers interest-rate trends in determining which types of bonds to emphasize at a given time. The fund typically favors mortgage-related securities when the manager anticipates that interest rates will be relatively stable and favors U.S. Treasuries at other times. Because high-yield bonds often respond to market movements differently than U.S. government bonds, the fund may use them to manage volatility.

The fund may invest in mortgage-related securities and derivatives. Derivatives, including futures contracts and options, may be used to reduce risk, obtain efficient market exposure, and/or enhance investment returns. The fund may trade securities actively.
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. Many factors affect performance, and fund shares will fluctuate in price, meaning you could lose money. The fund's investment strategy may not produce the intended results.

During periods of heightened market volatility or reduced liquidity, governments, their agencies, or other regulatory bodies, both within the United States and abroad, may take steps to intervene. These actions, which could include legislative, regulatory, or economic initiatives, might have unforeseeable consequences and could adversely affect the fund's performance or otherwise constrain the fund's ability to achieve its investment objective.

The fund's main risks are listed below in alphabetical order. Before investing, be sure to read the additional descriptions of these risks beginning on page 5 of the prospectus.

Changing distribution levels risk. The fund may cease or reduce the level of its distribution if income or dividends paid from its investments declines.

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. U.S. government securities are subject to varying degrees of credit risk depending upon the nature of their support. A downgrade or default affecting any of the fund's securities could affect the fund's performance.

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.

Economic and market events risk. Events in the U.S. and global financial markets 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. The conclusion of the U.S. Federal Reserve's quantitative easing stimulus program and/or increases in short-term interest rates could cause high volatility in fixed-income markets to continue. Banks and financial services companies could suffer losses if interest rates rise or economic conditions deteriorate.

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.

Foreign securities risk. Less information may be publicly available regarding foreign issuers. Foreign securities may be subject to foreign taxes and may be more volatile than U.S. securities. Currency fluctuations and political and economic developments may adversely impact the value of foreign securities.

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, along with specific additional associated risks, if any, include: futures contracts and options. Futures contracts and options generally are subject to counterparty risk.

Liquidity risk. An impairment of a fund's ability to sell securities or close derivative positions at advantageous prices exposes the fund to liquidity risk. Liquidity risk may result from 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.

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.

Mortgage-backed and asset-backed securities risk. Mortgage-backed and asset-backed securities are subject to different combinations of prepayment, extension, interest-rate, and other market risks.
Risk Lose Money [Text] rr_RiskLoseMoney Many factors affect performance, and fund shares will fluctuate in price, meaning you could lose money.
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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PAST PERFORMANCE

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 compared with a broad-based market index. 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, jhinvestments.com, or by calling 888-972-8696 between 8:30 A.M. and 5:00 P.M., Eastern time, on most business days.

A note on performance

Class A shares commenced operations on September 30, 1994. Because Class I shares of the fund had not commenced operations as of the date of this prospectus, the returns shown 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 shares would have been substantially similar to returns of Class A shares because both share classes are invested in the same portfolio of securities and returns would differ only to the extent that expenses of the classes are different.

Please note that after-tax returns 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.
Bar Chart [Heading] rr_BarChartHeading

Calendar year total returns (%)—Class I

Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Year-to-date total return. The fund's total return for the six months ended June 30, 2016, was 3.79%.
Best quarter: Q4 '08, 3.97%
Worst quarter: Q2 '13, –2.08%

Performance Table Heading rr_PerformanceTableHeading

Average annual total returns (%)—as of 12/31/15

Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate Please note that after-tax returns 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.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are not relevant to shares held in an IRA, 401(k), or other tax-advantaged investment plan.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) does not indicate future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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 compared with a broad-based market index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress jhinvestments.com
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 888-972-8696
(John Hancock Government Income Fund) | Barclays U.S. Government Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.86%
5 Years rr_AverageAnnualReturnYear05 2.77%
10 Years rr_AverageAnnualReturnYear10 4.10%
(John Hancock Government Income Fund) | Class I  
Prospectus: rr_ProspectusTable  
Maximum front-end sales charge (load) rr_MaximumCumulativeSalesChargeOverOther none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOther none
Management fee rr_ManagementFeesOverAssets 0.62%
Other expenses rr_OtherExpensesOverAssets 0.21% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.83%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [2]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.74%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 76
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 256
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 452
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,017
Annual Return 2006 rr_AnnualReturn2006 3.70%
Annual Return 2007 rr_AnnualReturn2007 6.14%
Annual Return 2008 rr_AnnualReturn2008 5.87%
Annual Return 2009 rr_AnnualReturn2009 4.73%
Annual Return 2010 rr_AnnualReturn2010 5.84%
Annual Return 2011 rr_AnnualReturn2011 6.22%
Annual Return 2012 rr_AnnualReturn2012 4.55%
Annual Return 2013 rr_AnnualReturn2013 (2.10%)
Annual Return 2014 rr_AnnualReturn2014 4.36%
Annual Return 2015 rr_AnnualReturn2015 0.32%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date total return. The fund's total return for the six months ended June 30, 2016, was 3.79%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 3.79%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2016
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter: Q4 '08, 3.97%
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.97%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter: Q2 '13, –2.08%
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.08%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
1 Year rr_AverageAnnualReturnYear01 0.32%
5 Years rr_AverageAnnualReturnYear05 2.63%
10 Years rr_AverageAnnualReturnYear10 3.93%
(John Hancock Government Income Fund) | Class I | after tax on distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 (0.67%)
5 Years rr_AverageAnnualReturnYear05 1.55%
10 Years rr_AverageAnnualReturnYear10 2.64%
(John Hancock Government Income Fund) | Class I | after tax on distributions, with sale  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.19%
5 Years rr_AverageAnnualReturnYear05 1.58%
10 Years rr_AverageAnnualReturnYear10 2.55%
[1] "Other expenses" have been estimated for the first year of operations of the fund's Class I shares.
[2] The advisor contractually agrees to limit its management fee to a maximum annual rate of 0.53% of the fund's average daily net assets. This agreement expires on September 30, 2017, 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.