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Risk/Return:rr_RiskReturnAbstract 
Document Typedei_DocumentType485BPOS
Document Period End Datedei_DocumentPeriodEndDateMay 31, 2011
Registrant Namedei_EntityRegistrantNameJOHN HANCOCK BOND TRUST
Central Index Keydei_EntityCentralIndexKey0000315554
Amendment Flagdei_AmendmentFlagfalse
Document Creation Datedei_DocumentCreationDateSep. 26, 2011
Document Effective Datedei_DocumentEffectiveDateOct. 01, 2011
Prospectus Daterr_ProspectusDateOct. 01, 2011
John Hancock Government Income Fund | Prospectus Class A, B and C Shares
 
Risk/Return:rr_RiskReturnAbstract 
Risk/Return [Heading]rr_RiskReturnHeadingJOHN HANCOCK GOVERNMENT INCOME FUND
Objective [Heading]rr_ObjectiveHeadingInvestment objective
Objective, Primary [Text Block]rr_ObjectivePrimaryTextBlockTo seek a high level of current income consistent with preservation of capital.
Objective, Secondary [Text Block]rr_ObjectiveSecondaryTextBlockMaintaining a stable share price is a secondary goal.
Fees and expensesjhbt315554_FundFeesAndExpensesAbstract 
Expense [Heading]rr_ExpenseHeadingFees and expenses
Expense Narrative [Text Block]rr_ExpenseNarrativeTextBlockThis 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 14 to 16 of the prospectus under “Sales charge reductions and waivers” or pages 94 to 98 of the fund’s statement of additional information under “Initial Sales Charge on Class A Shares.”
Expense Breakpoint Discountsjhbt315554_ExpenseBreakpointDiscountsAbstract 
Expense Breakpoint Discounts [Text]rr_ExpenseBreakpointDiscountsYou 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 14 to 16 of the prospectus under “Sales charge reductions and waivers” or pages 94 to 98 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
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Caption [Text]rr_ShareholderFeesCaptionShareholder fees (%) (fees paid directly from your investment)
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Caption [Text]rr_OperatingExpensesCaptionAnnual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)
Expenses Restated to Reflect Current [Text]rr_ExpensesRestatedToReflectCurrent"Other expenses" have been restated to reflect current transfer agency and service fees.
Fee Waiver or Reimbursement over Assets, Date of Terminationrr_FeeWaiverOrReimbursementOverAssetsDateOfTerminationSeptember 30, 2012
Expense examplerr_ExpenseExampleAbstract 
Expense Example [Heading]rr_ExpenseExampleHeadingExpense example
Expense Example Narrative [Text Block]rr_ExpenseExampleNarrativeTextBlockThis 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 $10,000 investment in the fund for the time periods indicated (Kept column) and then assuming a redemption of all of your shares at the end of those periods (Sold column). The example assumes a 5% average annual return. The example assumes fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example by Year [Heading]rr_ExpenseExampleByYearHeadingExpenses ($)
Expense Example by, Year, Caption [Text]rr_ExpenseExampleByYearCaptionSold
Expense Example, No Redemptionrr_ExpenseExampleNoRedemptionAbstract 
Expense Example, No Redemption, By Year, Caption [Text]rr_ExpenseExampleNoRedemptionByYearCaptionKept
Portfolio turnoverjhbt315554_PortfolioTurnoverAltAbstract 
Portfolio Turnover [Heading]rr_PortfolioTurnoverHeadingPortfolio turnover
Portfolio Turnover [Text Block]rr_PortfolioTurnoverTextBlockThe 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 83% of the average value of its portfolio.
Portfolio Turnover, Raterr_PortfolioTurnoverRate83.00%
Strategy [Heading]rr_StrategyHeadingPrincipal 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:
 
n  the full faith and credit of the United States government, such as Treasury bills, notes and bonds, and Government National Mortgage Association Certificates.
n  the right of the issuer to borrow from the U.S. Treasury, such as obligations of the Federal Home Loan Mortgage Corporation.
n  the credit of the instrumentality, such as obligations of the Federal National Mortgage Association.

The fund may invest in higher-risk securities, including U.S. dollar-denominated foreign government securities and asset-backed securities. It may also invest up to 10% of assets in foreign government high-yield securities (junk bonds) rated as low as B and their unrated equivalents.

In managing the fund’s portfolio, the subadviser considers interest rate trends to determine which types of bonds to emphasize at a given time. The fund typically favors mortgage-related securities when it 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 from U.S. government bonds, the fund may use them to manage volatility.

The fund may invest in mortgage-related securities and may engage in derivative transactions that include futures contracts and options, in each case, for the purposes of reducing risk, obtaining efficient market exposure and/or enhancing investment returns.

Risk [Heading]rr_RiskHeadingPrincipal 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 United States 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 5 of the prospectus.

Active management risk The subadviser’s investment strategy may fail to produce the intended result.

Changing distribution levels risk The amount of the distributions paid by the fund generally depends on the amount of income and/or dividends received by the fund on the securities it holds.

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 to 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.

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 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.

Foreign securities risk As compared to U.S. companies, there may be less publicly available information relating to foreign companies. Foreign securities may be subject to foreign taxes. The value of foreign securities is subject to currency fluctuations and adverse political and economic developments.

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 the 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.
 
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.

Mortgage-backed and asset-backed securities risk Different types of mortgage-backed securities and asset-backed securities are subject to different combinations of prepayment, extension, interest-rate and/or other market risks.

Risk Not Insured Depository Institution [Text]rr_RiskNotInsuredDepositoryInstitutionAn 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 Lose Money [Text]rr_RiskLoseMoneyThe fund’s shares will go up and down in price, meaning that you could lose money by investing in the fund.
Past performancejhbt315554_FundPastPerformanceAbstract 
Bar Chart and Performance Table [Heading]rr_BarChartAndPerformanceTableHeadingPast 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 Web site: www.jhfunds.com/FundPerformance, or by calling Signature Services at 1-800-225-5291 between 8:00 A.M. and 7:00 P.M., Eastern Time, on most business days.

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.

Performance Information Illustrates Variability of Returns [Text]rr_PerformanceInformationIllustratesVariabilityOfReturnsThe 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 Past Does Not Indicate Future [Text]rr_PerformancePastDoesNotIndicateFutureHowever, past performance (before and after taxes) does not indicate future results.
Performance Table Closing [Text Block]rr_PerformanceTableClosingTextBlockPerformance for the fund is updated daily, monthly and quarterly and may be obtained at our Web site: www.jhfunds.com/FundPerformance, or by calling Signature Services at 1-800-225-5291 between 8:00 A.M. and 7:00 P.M., Eastern Time, on most business days.
Performance Availability Website Address [Text]rr_PerformanceAvailabilityWebSiteAddresswww.jhfunds.com/FundPerformance
Performance Availability Phone [Text]rr_PerformanceAvailabilityPhone1-800-225-5291
Bar Chart Does Not Reflect Sales Loads [Text]rr_BarChartDoesNotReflectSalesLoadsCalendar year total returns These do not include sales charges and would have been lower if they did.
Performance Additional Market Index [Text]rr_PerformanceAdditionalMarketIndexAverage annual total returns Performance of a broad-based market index is included for comparison.
Performance Table One Class of after Tax Shown [Text]rr_PerformanceTableOneClassOfAfterTaxShownAfter-tax returns These are shown only for Class A shares and would be different for other classes.
Performance Table Uses Highest Federal Raterr_PerformanceTableUsesHighestFederalRateThey 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 Deferredrr_PerformanceTableNotRelevantToTaxDeferredYour 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.
Annual Total Returnsrr_BarChartTableAbstract 
Bar Chart [Heading]rr_BarChartHeadingCalendar 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, 2011 was 2.74%.

Best quarter: Q3 ’02, 5.44%

Worst quarter: Q2 ’04, -2.72%

Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Captionrr_AverageAnnualReturnCaptionAverage annual total returns (%) as of 12-31-10
John Hancock Government Income Fund | Prospectus Class A, B and C Shares | Class A
 
Risk/Return:rr_RiskReturnAbstract 
Trading Symboldei_TradingSymbolJHGIX
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Column [Text]rr_ShareholderFeesColumnNameClass A
Maximum front-end sales charge (load) on purchases as a % of purchase pricerr_MaximumCumulativeSalesChargeOverOther4.50%
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is lessrr_MaximumDeferredSalesChargeOverOther1.00%[1]
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Column [Text]rr_OperatingExpensesColumnNameClass A
Management feerr_ManagementFeesOverAssets0.60%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets0.25%
Other expensesrr_OtherExpensesOverAssets0.28%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.13%
Contractual expense reimbursementrr_FeeWaiverOrReimbursementOverAssets(0.05%)[3]
Total annual fund operating expenses after expense reimbursementsrr_NetExpensesOverAssets1.08%
Expense examplerr_ExpenseExampleAbstract 
Expense Example, By Year, Column [Text]rr_ExpenseExampleByYearColumnNameClass A
1 Yearrr_ExpenseExampleYear01555
3 Yearsrr_ExpenseExampleYear03788
5 Yearsrr_ExpenseExampleYear051,040
10 Yearsrr_ExpenseExampleYear101,759
Expense Example, No Redemptionrr_ExpenseExampleNoRedemptionAbstract 
Expense Example, No Redemption, By Year, Column [Text]rr_ExpenseExampleNoRedemptionByYearColumnNameClass A
1 Yearrr_ExpenseExampleNoRedemptionYear01555
3 Yearsrr_ExpenseExampleNoRedemptionYear03788
5 Yearsrr_ExpenseExampleNoRedemptionYear051,040
10 Yearsrr_ExpenseExampleNoRedemptionYear101,759
Annual Total Returnsrr_BarChartTableAbstract 
2001rr_AnnualReturn20016.66%
2002rr_AnnualReturn200210.26%
2003rr_AnnualReturn20031.09%
2004rr_AnnualReturn20042.70%
2005rr_AnnualReturn20051.73%
2006rr_AnnualReturn20063.70%
2007rr_AnnualReturn20076.14%
2008rr_AnnualReturn20085.87%
2009rr_AnnualReturn20094.73%
2010rr_AnnualReturn20105.84%
Year to Date Return, Labelrr_YearToDateReturnLabelYear-to-date total return The fund’s total return for the six months ended
Bar Chart, Year to Date Return, Daterr_BarChartYearToDateReturnDateJun. 30, 2011
Bar Chart, Year to Date Returnrr_BarChartYearToDateReturn2.74%
Highest Quarterly Return, Labelrr_HighestQuarterlyReturnLabelBest quarter:
Highest Quarterly Return, Daterr_BarChartHighestQuarterlyReturnDateSep. 30, 2002
Highest Quarterly Returnrr_BarChartHighestQuarterlyReturn5.44%
Lowest Quarterly Return, Labelrr_LowestQuarterlyReturnLabelWorst quarter:
Lowest Quarterly Return, Daterr_BarChartLowestQuarterlyReturnDateJun. 30, 2004
Lowest Quarterly Returnrr_BarChartLowestQuarterlyReturn(2.72%)
John Hancock Government Income Fund | Prospectus Class A, B and C Shares | Class B
 
Risk/Return:rr_RiskReturnAbstract 
Trading Symboldei_TradingSymbolTSGIX
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Column [Text]rr_ShareholderFeesColumnNameClass B
Maximum front-end sales charge (load) on purchases as a % of purchase pricerr_MaximumCumulativeSalesChargeOverOther 
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is lessrr_MaximumDeferredSalesChargeOverOther5.00%
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Column [Text]rr_OperatingExpensesColumnNameClass B
Management feerr_ManagementFeesOverAssets0.60%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets1.00%
Other expensesrr_OtherExpensesOverAssets0.28%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.88%
Contractual expense reimbursementrr_FeeWaiverOrReimbursementOverAssets(0.05%)[3]
Total annual fund operating expenses after expense reimbursementsrr_NetExpensesOverAssets1.83%
Expense examplerr_ExpenseExampleAbstract 
Expense Example, By Year, Column [Text]rr_ExpenseExampleByYearColumnNameClass B
1 Yearrr_ExpenseExampleYear01686
3 Yearsrr_ExpenseExampleYear03886
5 Yearsrr_ExpenseExampleYear051,211
10 Yearsrr_ExpenseExampleYear102,001
Expense Example, No Redemptionrr_ExpenseExampleNoRedemptionAbstract 
Expense Example, No Redemption, By Year, Column [Text]rr_ExpenseExampleNoRedemptionByYearColumnNameClass B
1 Yearrr_ExpenseExampleNoRedemptionYear01186
3 Yearsrr_ExpenseExampleNoRedemptionYear03586
5 Yearsrr_ExpenseExampleNoRedemptionYear051,011
10 Yearsrr_ExpenseExampleNoRedemptionYear102,001
John Hancock Government Income Fund | Prospectus Class A, B and C Shares | Class C
 
Risk/Return:rr_RiskReturnAbstract 
Trading Symboldei_TradingSymbolTCGIX
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Column [Text]rr_ShareholderFeesColumnNameClass C
Maximum front-end sales charge (load) on purchases as a % of purchase pricerr_MaximumCumulativeSalesChargeOverOther 
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is lessrr_MaximumDeferredSalesChargeOverOther1.00%
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Column [Text]rr_OperatingExpensesColumnNameClass C
Management feerr_ManagementFeesOverAssets0.60%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets1.00%
Other expensesrr_OtherExpensesOverAssets0.28%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.88%
Contractual expense reimbursementrr_FeeWaiverOrReimbursementOverAssets(0.05%)[3]
Total annual fund operating expenses after expense reimbursementsrr_NetExpensesOverAssets1.83%
Expense examplerr_ExpenseExampleAbstract 
Expense Example, By Year, Column [Text]rr_ExpenseExampleByYearColumnNameClass C
1 Yearrr_ExpenseExampleYear01286
3 Yearsrr_ExpenseExampleYear03586
5 Yearsrr_ExpenseExampleYear051,011
10 Yearsrr_ExpenseExampleYear102,197
Expense Example, No Redemptionrr_ExpenseExampleNoRedemptionAbstract 
Expense Example, No Redemption, By Year, Column [Text]rr_ExpenseExampleNoRedemptionByYearColumnNameClass C
1 Yearrr_ExpenseExampleNoRedemptionYear01186
3 Yearsrr_ExpenseExampleNoRedemptionYear03586
5 Yearsrr_ExpenseExampleNoRedemptionYear051,011
10 Yearsrr_ExpenseExampleNoRedemptionYear102,197
John Hancock Government Income Fund | Prospectus Class A, B and C Shares | before tax | Class A
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass A
Labelrr_AverageAnnualReturnLabelbefore tax
1 Yearrr_AverageAnnualReturnYear011.05%
5 Yearrr_AverageAnnualReturnYear054.28%
10 Yearrr_AverageAnnualReturnYear104.36%
John Hancock Government Income Fund | Prospectus Class A, B and C Shares | before tax | Class B
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass B
Labelrr_AverageAnnualReturnLabelbefore tax
1 Yearrr_AverageAnnualReturnYear01(0.06%)
5 Yearrr_AverageAnnualReturnYear054.11%
10 Yearrr_AverageAnnualReturnYear104.22%
John Hancock Government Income Fund | Prospectus Class A, B and C Shares | before tax | Class C
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass C
Labelrr_AverageAnnualReturnLabelbefore tax
1 Yearrr_AverageAnnualReturnYear014.06%
5 Yearrr_AverageAnnualReturnYear054.47%
10 Yearrr_AverageAnnualReturnYear104.06%
John Hancock Government Income Fund | Prospectus Class A, B and C Shares | After tax on distributions | Class A
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass A
Labelrr_AverageAnnualReturnLabelAfter tax on distributions
1 Yearrr_AverageAnnualReturnYear01(0.08%)
5 Yearrr_AverageAnnualReturnYear052.79%
10 Yearrr_AverageAnnualReturnYear102.76%
John Hancock Government Income Fund | Prospectus Class A, B and C Shares | After tax on distributions, with sale | Class A
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass A
Labelrr_AverageAnnualReturnLabelAfter tax on distributions, with sale
1 Yearrr_AverageAnnualReturnYear010.68%
5 Yearrr_AverageAnnualReturnYear052.76%
10 Yearrr_AverageAnnualReturnYear102.75%
John Hancock Government Income Fund | Prospectus Class A, B and C Shares | Barclays Capital U.S. Government Bond Index
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Labelrr_AverageAnnualReturnLabelBarclays Capital U.S. Government Bond Index
1 Yearrr_AverageAnnualReturnYear015.52%
5 Yearrr_AverageAnnualReturnYear055.45%
10 Yearrr_AverageAnnualReturnYear105.42%
John Hancock High Yield Fund | Prospectus Class A, B and C Shares
 
Risk/Return:rr_RiskReturnAbstract 
Risk/Return [Heading]rr_RiskReturnHeadingJOHN HANCOCK HIGH YIELD FUND
Objective [Heading]rr_ObjectiveHeadingInvestment objective
Objective, Primary [Text Block]rr_ObjectivePrimaryTextBlockTo seek high current income.
Objective, Secondary [Text Block]rr_ObjectiveSecondaryTextBlockCapital appreciation is a secondary goal.
Fees and expensesjhbt315554_FundFeesAndExpensesAbstract 
Expense [Heading]rr_ExpenseHeadingFees and expenses
Expense Narrative [Text Block]rr_ExpenseNarrativeTextBlockThis 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 14 to 16 of the prospectus under “Sales charge reductions and waivers” or pages 94 to 98 of the fund’s statement of additional information under “Initial Sales Charge on Class A Shares.”
Expense Breakpoint Discountsjhbt315554_ExpenseBreakpointDiscountsAbstract 
Expense Breakpoint Discounts [Text]rr_ExpenseBreakpointDiscountsYou 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 14 to 16 of the prospectus under “Sales charge reductions and waivers” or pages 94 to 98 of the fund’s statement of additional information under “Initial Sales Charge on Class A Shares.”
Expense Breakpoint, Minimum Investment Required [Amount]rr_ExpenseBreakpointMinimumInvestmentRequiredAmount100,000
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Caption [Text]rr_ShareholderFeesCaptionShareholder fees (%) (fees paid directly from your investment)
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Caption [Text]rr_OperatingExpensesCaptionAnnual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)
Expenses Restated to Reflect Current [Text]rr_ExpensesRestatedToReflectCurrent“Other expenses” have been restated to reflect current transfer agency and service fees.
Expense examplerr_ExpenseExampleAbstract 
Expense Example [Heading]rr_ExpenseExampleHeadingExpense example
Expense Example Narrative [Text Block]rr_ExpenseExampleNarrativeTextBlockThis 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 $10,000 investment in the fund for the time periods indicated (Kept column) and then assuming a redemption of all of your shares at the end of those periods (Sold column). The example assumes a 5% average annual return. The example assumes fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example by Year [Heading]rr_ExpenseExampleByYearHeadingExpenses ($)
Expense Example by, Year, Caption [Text]rr_ExpenseExampleByYearCaptionSold
Expense Example, No Redemptionrr_ExpenseExampleNoRedemptionAbstract 
Expense Example, No Redemption, By Year, Caption [Text]rr_ExpenseExampleNoRedemptionByYearCaptionKept
Portfolio turnoverjhbt315554_PortfolioTurnoverAltAbstract 
Portfolio Turnover [Heading]rr_PortfolioTurnoverHeadingPortfolio turnover
Portfolio Turnover [Text Block]rr_PortfolioTurnoverTextBlockThe 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 51% of the average value of its portfolio.
Portfolio Turnover, Raterr_PortfolioTurnoverRate51.00%
Strategy [Heading]rr_StrategyHeadingPrincipal 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 U.S. and foreign fixed-income securities rated BB/Ba or lower and their unrated equivalents. These may include, but are not limited to, domestic and foreign corporate bonds, debentures and notes, convertible securities, preferred securities and domestic and foreign government obligations. No more than 10% of the fund’s total assets may be invested in securities that, at the time of purchase, are rated in default by Standard & Poor’s (S&P) or by Moody’s Investors Service (Moody’s). There is no limit on the fund’s average maturity.

In managing the fund’s portfolio, the subadviser concentrates on industry allocation and securities selection, deciding which types of industries to emphasize at a given time and then which individual securities to buy. The subadviser uses top-down analysis to determine which industries may benefit from current and future changes in the economy.

The fund may hold up to 20% of its total assets in the securities of companies in any one industry and up to 10% of its total assets in the securities of any individual issuer.

In choosing individual securities, the subadviser uses bottom-up research to find securities that appear comparatively undervalued. The subadviser looks at the financial condition of the issuers, as well as the collateralization and other features of the securities themselves. The fund typically invests in a broad range of industries.

The fund may use certain higher-risk investments, including restricted or illiquid securities and derivatives, which include futures contracts on securities, indexes and foreign currency; options on futures contracts, securities, indexes and foreign currency; interest rate, foreign currency and credit default swaps; and foreign currency forward contracts, in each case, for the purposes of reducing risk, obtaining efficient market exposure and/or enhancing investment returns. In addition, the fund may invest up to 20% of its assets in U.S. and foreign common stocks of companies of any size.

Risk [Heading]rr_RiskHeadingPrincipal 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 United States 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 subadviser’s investment strategy may fail to produce the intended result.

Changing distribution levels risk The amount of the distributions paid by the fund generally depends on the amount of income and/or dividends received by the fund on the securities it holds. As a result of market, interest rate and other circumstances, the amount of cash available for distribution by the fund and the fund’s distribution rate may vary or decline. The risk of such variability is accentuated in currently prevailing market and interest rate circumstances.

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 to honor its obligations. 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.

Equity securities risk The value of a company’s equity securities is subject to changes in the company’s financial condition, and overall market and economic conditions.

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 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.

Foreign securities risk As compared to U.S. companies, there may be less publicly available information relating to foreign companies. Foreign securities may be subject to foreign taxes. The value of foreign securities is subject to currency fluctuations and adverse political and economic developments.

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 the derivatives and other strategic transactions in which the fund intends to invest and the main risks associated with each of them:
 
Credit default swaps Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), interest-rate risk, risk of default of the underlying reference obligation and risk of disproportionate loss are the principal risks of engaging in transactions involving credit default swaps.
 
Foreign currency forward contracts Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), foreign currency risk and risk of disproportionate loss are the principal risks of engaging in transactions involving foreign currency forward contracts.
 
Foreign currency swaps Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), foreign currency risk and risk of disproportionate loss are the principal risks of engaging in transactions involving foreign currency swaps.
 
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.
 
Interest-rate swaps Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), interest-rate risk and risk of disproportionate loss are the principal risks of engaging in transactions involving interest-rate swaps.
 
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.

Issuer risk An issuer of a security may perform poorly and, therefore, the value of its stocks and bonds may decline. An issuer of securities held by the fund could default or have its credit rating downgraded.

Liquidity risk Exposure exists when trading volume, lack of a market maker or legal restrictions impair the ability to sell particular securities or close derivative positions at an advantageous price.

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.

Medium and smaller company risk The prices of medium and smaller company stocks can change more frequently and dramatically than those of large company stocks. For purposes of the fund’s investment policies, the market capitalization of a company is based on its market capitalization at the time the fund purchases the company’s securities. Market capitalizations of companies change over time.

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.

Risk Not Insured Depository Institution [Text]rr_RiskNotInsuredDepositoryInstitutionAn 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 Lose Money [Text]rr_RiskLoseMoneyThe fund’s shares will go up and down in price, meaning that you could lose money by investing in the fund.
Past performancejhbt315554_FundPastPerformanceAbstract 
Bar Chart and Performance Table [Heading]rr_BarChartAndPerformanceTableHeadingPast 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 Web site: www.jhfunds.com/FundPerformance, or by calling Signature Services at 1-800-225-5291 between 8:00 A.M. and 7:00 P.M., Eastern Time, on most business days.

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.

Performance Information Illustrates Variability of Returns [Text]rr_PerformanceInformationIllustratesVariabilityOfReturnsThe 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 Past Does Not Indicate Future [Text]rr_PerformancePastDoesNotIndicateFutureHowever, past performance (before and after taxes) does not indicate future results.
Performance Table Closing [Text Block]rr_PerformanceTableClosingTextBlockPerformance for the fund is updated daily, monthly and quarterly and may be obtained at our Web site: www.jhfunds.com/FundPerformance, or by calling Signature Services at 1-800-225-5291 between 8:00 A.M. and 7:00 P.M., Eastern Time, on most business days.
Performance Availability Website Address [Text]rr_PerformanceAvailabilityWebSiteAddresswww.jhfunds.com/FundPerformance
Performance Availability Phone [Text]rr_PerformanceAvailabilityPhone1-800-225-5291
Bar Chart Does Not Reflect Sales Loads [Text]rr_BarChartDoesNotReflectSalesLoadsCalendar year total returns These do not include sales charges and would have been lower if they did.
Performance Additional Market Index [Text]rr_PerformanceAdditionalMarketIndexAverage annual total returns Performance of a broad-based market index is included for comparison.
Performance Table One Class of after Tax Shown [Text]rr_PerformanceTableOneClassOfAfterTaxShownAfter-tax returns These are shown only for Class A shares and would be different for other classes.
Performance Table Uses Highest Federal Raterr_PerformanceTableUsesHighestFederalRateThey 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 Deferredrr_PerformanceTableNotRelevantToTaxDeferredYour 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.
Annual Total Returnsrr_BarChartTableAbstract 
Bar Chart [Heading]rr_BarChartHeadingCalendar 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, 2011 was 0.86%.

Best quarter: Q3 ’09, 29.25%

Worst quarter: Q4 ’08, -30.28%

Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Captionrr_AverageAnnualReturnCaptionAverage annual total returns (%) as of 12-31-10
John Hancock High Yield Fund | Prospectus Class A, B and C Shares | Class A
 
Risk/Return:rr_RiskReturnAbstract 
Trading Symboldei_TradingSymbolJHHBX
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Column [Text]rr_ShareholderFeesColumnNameClass A
Maximum front-end sales charge (load) on purchases as a % of purchase pricerr_MaximumCumulativeSalesChargeOverOther4.50%
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is lessrr_MaximumDeferredSalesChargeOverOther1.00%[1]
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Column [Text]rr_OperatingExpensesColumnNameClass A
Management feerr_ManagementFeesOverAssets0.51%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets0.25%
Other expensesrr_OtherExpensesOverAssets0.27%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.03%
Expense examplerr_ExpenseExampleAbstract 
Expense Example, By Year, Column [Text]rr_ExpenseExampleByYearColumnNameClass A
1 Yearrr_ExpenseExampleYear01550
3 Yearsrr_ExpenseExampleYear03763
5 Yearsrr_ExpenseExampleYear05993
10 Yearsrr_ExpenseExampleYear101,653
Expense Example, No Redemptionrr_ExpenseExampleNoRedemptionAbstract 
Expense Example, No Redemption, By Year, Column [Text]rr_ExpenseExampleNoRedemptionByYearColumnNameClass A
1 Yearrr_ExpenseExampleNoRedemptionYear01550
3 Yearsrr_ExpenseExampleNoRedemptionYear03763
5 Yearsrr_ExpenseExampleNoRedemptionYear05993
10 Yearsrr_ExpenseExampleNoRedemptionYear101,653
Annual Total Returnsrr_BarChartTableAbstract 
2001rr_AnnualReturn20010.78%
2002rr_AnnualReturn20020.44%
2003rr_AnnualReturn200339.91%
2004rr_AnnualReturn20049.00%
2005rr_AnnualReturn20053.59%
2006rr_AnnualReturn200620.25%
2007rr_AnnualReturn2007(1.21%)
2008rr_AnnualReturn2008(48.45%)
2009rr_AnnualReturn200969.57%
2010rr_AnnualReturn201024.85%
Year to Date Return, Labelrr_YearToDateReturnLabelYear-to-date total return The fund’s total return for the six months ended
Bar Chart, Year to Date Return, Daterr_BarChartYearToDateReturnDateJun. 30, 2011
Bar Chart, Year to Date Returnrr_BarChartYearToDateReturn0.86%
Highest Quarterly Return, Labelrr_HighestQuarterlyReturnLabelBest quarter:
Highest Quarterly Return, Daterr_BarChartHighestQuarterlyReturnDateSep. 30, 2009
Highest Quarterly Returnrr_BarChartHighestQuarterlyReturn29.25%
Lowest Quarterly Return, Labelrr_LowestQuarterlyReturnLabelWorst quarter:
Lowest Quarterly Return, Daterr_BarChartLowestQuarterlyReturnDateDec. 31, 2008
Lowest Quarterly Returnrr_BarChartLowestQuarterlyReturn(30.28%)
John Hancock High Yield Fund | Prospectus Class A, B and C Shares | Class B
 
Risk/Return:rr_RiskReturnAbstract 
Trading Symboldei_TradingSymbolTSHYX
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Column [Text]rr_ShareholderFeesColumnNameClass B
Maximum front-end sales charge (load) on purchases as a % of purchase pricerr_MaximumCumulativeSalesChargeOverOther 
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is lessrr_MaximumDeferredSalesChargeOverOther5.00%
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Column [Text]rr_OperatingExpensesColumnNameClass B
Management feerr_ManagementFeesOverAssets0.51%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets1.00%
Other expensesrr_OtherExpensesOverAssets0.27%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.78%
Expense examplerr_ExpenseExampleAbstract 
Expense Example, By Year, Column [Text]rr_ExpenseExampleByYearColumnNameClass B
1 Yearrr_ExpenseExampleYear01681
3 Yearsrr_ExpenseExampleYear03860
5 Yearsrr_ExpenseExampleYear051,164
10 Yearsrr_ExpenseExampleYear101,897
Expense Example, No Redemptionrr_ExpenseExampleNoRedemptionAbstract 
Expense Example, No Redemption, By Year, Column [Text]rr_ExpenseExampleNoRedemptionByYearColumnNameClass B
1 Yearrr_ExpenseExampleNoRedemptionYear01181
3 Yearsrr_ExpenseExampleNoRedemptionYear03560
5 Yearsrr_ExpenseExampleNoRedemptionYear05964
10 Yearsrr_ExpenseExampleNoRedemptionYear101,897
John Hancock High Yield Fund | Prospectus Class A, B and C Shares | Class C
 
Risk/Return:rr_RiskReturnAbstract 
Trading Symboldei_TradingSymbolJHYCX
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Column [Text]rr_ShareholderFeesColumnNameClass C
Maximum front-end sales charge (load) on purchases as a % of purchase pricerr_MaximumCumulativeSalesChargeOverOther 
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is lessrr_MaximumDeferredSalesChargeOverOther1.00%
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Column [Text]rr_OperatingExpensesColumnNameClass C
Management feerr_ManagementFeesOverAssets0.51%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets1.00%
Other expensesrr_OtherExpensesOverAssets0.27%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.78%
Expense examplerr_ExpenseExampleAbstract 
Expense Example, By Year, Column [Text]rr_ExpenseExampleByYearColumnNameClass C
1 Yearrr_ExpenseExampleYear01281
3 Yearsrr_ExpenseExampleYear03560
5 Yearsrr_ExpenseExampleYear05964
10 Yearsrr_ExpenseExampleYear102,095
Expense Example, No Redemptionrr_ExpenseExampleNoRedemptionAbstract 
Expense Example, No Redemption, By Year, Column [Text]rr_ExpenseExampleNoRedemptionByYearColumnNameClass C
1 Yearrr_ExpenseExampleNoRedemptionYear01181
3 Yearsrr_ExpenseExampleNoRedemptionYear03560
5 Yearsrr_ExpenseExampleNoRedemptionYear05964
10 Yearsrr_ExpenseExampleNoRedemptionYear102,095
John Hancock High Yield Fund | Prospectus Class A, B and C Shares | before tax | Class A
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass A
Labelrr_AverageAnnualReturnLabelbefore tax
1 Yearrr_AverageAnnualReturnYear0119.29%
5 Yearrr_AverageAnnualReturnYear054.37%
10 Yearrr_AverageAnnualReturnYear107.08%
John Hancock High Yield Fund | Prospectus Class A, B and C Shares | before tax | Class B
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass B
Labelrr_AverageAnnualReturnLabelbefore tax
1 Yearrr_AverageAnnualReturnYear0119.25%
5 Yearrr_AverageAnnualReturnYear054.35%
10 Yearrr_AverageAnnualReturnYear106.93%
John Hancock High Yield Fund | Prospectus Class A, B and C Shares | before tax | Class C
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass C
Labelrr_AverageAnnualReturnLabelbefore tax
1 Yearrr_AverageAnnualReturnYear0122.63%
5 Yearrr_AverageAnnualReturnYear054.50%
10 Yearrr_AverageAnnualReturnYear106.74%
John Hancock High Yield Fund | Prospectus Class A, B and C Shares | After tax on distributions | Class A
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass A
Labelrr_AverageAnnualReturnLabelAfter tax on distributions
1 Yearrr_AverageAnnualReturnYear0115.69%
5 Yearrr_AverageAnnualReturnYear050.64%
10 Yearrr_AverageAnnualReturnYear103.32%
John Hancock High Yield Fund | Prospectus Class A, B and C Shares | After tax on distributions, with sale | Class A
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass A
Labelrr_AverageAnnualReturnLabelAfter tax on distributions, with sale
1 Yearrr_AverageAnnualReturnYear0112.34%
5 Yearrr_AverageAnnualReturnYear051.38%
10 Yearrr_AverageAnnualReturnYear103.67%
John Hancock High Yield Fund | Prospectus Class A, B and C Shares | Bank of America Merrill Lynch US High Yield Master II Index
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Labelrr_AverageAnnualReturnLabelBank of America Merrill Lynch US High Yield Master II Index
1 Yearrr_AverageAnnualReturnYear0115.19%
5 Yearrr_AverageAnnualReturnYear058.82%
10 Yearrr_AverageAnnualReturnYear108.60%
John Hancock High Yield Fund | Prospectus Class I Shares
 
Risk/Return:rr_RiskReturnAbstract 
Risk/Return [Heading]rr_RiskReturnHeadingJOHN HANCOCK HIGH YIELD FUND
Objective [Heading]rr_ObjectiveHeadingInvestment objective
Objective, Primary [Text Block]rr_ObjectivePrimaryTextBlockTo seek high current income.
Objective, Secondary [Text Block]rr_ObjectiveSecondaryTextBlockCapital appreciation is a secondary goal.
Fees and expensesjhbt315554_FundFeesAndExpensesAbstract 
Expense [Heading]rr_ExpenseHeadingFees and expenses
Expense Narrative [Text Block]rr_ExpenseNarrativeTextBlockThis table describes the fees and expenses you may pay if you buy and hold shares of the fund.
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Caption [Text]rr_ShareholderFeesCaptionShareholder fees (%) (fees paid directly from your investment)
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Caption [Text]rr_OperatingExpensesCaptionAnnual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)
Expenses Restated to Reflect Current [Text]rr_ExpensesRestatedToReflectCurrent“Other expenses” have been restated to reflect current transfer agency and service fees.
Expense examplerr_ExpenseExampleAbstract 
Expense Example [Heading]rr_ExpenseExampleHeadingExpense example
Expense Example Narrative [Text Block]rr_ExpenseExampleNarrativeTextBlockThis 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 $10,000 investment at the end of the various time frames indicated. The example assumes a 5% average annual return. The example assumes fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example by Year [Heading]rr_ExpenseExampleByYearHeadingExpenses ($)
Portfolio turnoverjhbt315554_PortfolioTurnoverAltAbstract 
Portfolio Turnover [Heading]rr_PortfolioTurnoverHeadingPortfolio turnover
Portfolio Turnover [Text Block]rr_PortfolioTurnoverTextBlockThe 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 51% of the average value of its portfolio.
Portfolio Turnover, Raterr_PortfolioTurnoverRate51.00%
Strategy [Heading]rr_StrategyHeadingPrincipal 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 U.S. and foreign fixed-income securities rated BB/Ba or lower and their unrated equivalents. These may include, but are not limited to, domestic and foreign corporate bonds, debentures and notes, convertible securities, preferred securities and domestic and foreign government obligations. No more than 10% of the fund’s total assets may be invested in securities that, at the time of purchase, are rated in default by Standard & Poor’s (S&P) or by Moody’s Investors Service (Moody’s). There is no limit on the fund’s average maturity.

In managing the fund’s portfolio, the subadviser concentrates on industry allocation and securities selection, deciding which types of industries to emphasize at a given time and then which individual securities to buy. The subadviser uses top-down analysis to determine which industries may benefit from current and future changes in the economy.

The fund may hold up to 20% of its total assets in the securities of companies in any one industry and up to 10% of its total assets in the securities of any individual issuer.

In choosing individual securities, the subadviser uses bottom-up research to find securities that appear comparatively undervalued. The subadviser looks at the financial condition of the issuers, as well as the collateralization and other features of the securities themselves. The fund typically invests in a broad range of industries.

The fund may use certain higher-risk investments, including restricted or illiquid securities and derivatives, which include futures contracts on securities, indexes and foreign currency; options on futures contracts, securities, indexes and foreign currency; interest rate, foreign currency and credit default swaps; and foreign currency forward contracts, in each case, for the purposes of reducing risk, obtaining efficient market exposure and/or enhancing investment returns. In addition, the fund may invest up to 20% of its assets in U.S. and foreign common stocks of companies of any size.

Risk [Heading]rr_RiskHeadingPrincipal 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 United States 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 subadviser’s investment strategy may fail to produce the intended result.

Changing distribution levels risk The amount of the distributions paid by the fund generally depends on the amount of income and/or dividends received by the fund on the securities it holds. As a result of market, interest rate and other circumstances, the amount of cash available for distribution by the fund and the fund’s distribution rate may vary or decline. The risk of such variability is accentuated in currently prevailing market and interest rate circumstances.

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 to honor its obligations. 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.

Equity securities risk The value of a company’s equity securities is subject to changes in the company’s financial condition, and overall market and economic conditions.

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 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.

Foreign securities risk As compared to U.S. companies, there may be less publicly available information relating to foreign companies. Foreign securities may be subject to foreign taxes. The value of foreign securities is subject to currency fluctuations and adverse political and economic developments.

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 the derivatives and other strategic transactions in which the fund intends to invest and the main risks associated with each of them:
 
Credit default swaps Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), interest-rate risk, risk of default of the underlying reference obligation and risk of disproportionate loss are the principal risks of engaging in transactions involving credit default swaps.
 
Foreign currency forward contracts Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), foreign currency risk and risk of disproportionate loss are the principal risks of engaging in transactions involving foreign currency forward contracts.
 
Foreign currency swaps Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), foreign currency risk and risk of disproportionate loss are the principal risks of engaging in transactions involving foreign currency swaps.
 
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.
 
Interest-rate swaps Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), interest-rate risk and risk of disproportionate loss are the principal risks of engaging in transactions involving interest-rate swaps.
 
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.

Issuer risk An issuer of a security may perform poorly and, therefore, the value of its stocks and bonds may decline. An issuer of securities held by the fund could default or have its credit rating downgraded.

Liquidity risk Exposure exists when trading volume, lack of a market maker or legal restrictions impair the ability to sell particular securities or close derivative positions at an advantageous price.

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.

Medium and smaller company risk The prices of medium and smaller company stocks can change more frequently and dramatically than those of large company stocks. For purposes of the fund’s investment policies, the market capitalization of a company is based on its market capitalization at the time the fund purchases the company’s securities. Market capitalizations of companies change over time.

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.

Risk Not Insured Depository Institution [Text]rr_RiskNotInsuredDepositoryInstitutionAn 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 Lose Money [Text]rr_RiskLoseMoneyThe fund’s shares will go up and down in price, meaning that you could lose money by investing in the fund.
Past performancejhbt315554_FundPastPerformanceAbstract 
Bar Chart and Performance Table [Heading]rr_BarChartAndPerformanceTableHeadingPast 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 Web site: www.jhfunds.com/InstitutionalPerformance, or by calling Signature Services at 1-888-972-8696 between 8:00 A.M. and 7:00 P.M., Eastern Time, on most business days.

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

After-tax returns 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.

June 30, 1993 is the inception date for Class A shares. Class I shares were first offered on August 27, 2007; the returns prior to this date are those of Class A shares that have been recalculated to apply the fees and expenses of Class I shares.

Performance Information Illustrates Variability of Returns [Text]rr_PerformanceInformationIllustratesVariabilityOfReturnsThe 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 Past Does Not Indicate Future [Text]rr_PerformancePastDoesNotIndicateFutureHowever, past performance (before and after taxes) does not indicate future results.
Performance Table Closing [Text Block]rr_PerformanceTableClosingTextBlockPerformance for the fund is updated daily, monthly and quarterly and may be obtained at our Web site: www.jhfunds.com/InstitutionalPerformance, or by calling Signature Services at 1-888-972-8696 between 8:00 A.M. and 7:00 P.M., Eastern Time, on most business days.
Performance Availability Website Address [Text]rr_PerformanceAvailabilityWebSiteAddresswww.jhfunds.com/InstitutionalPerformance
Performance Availability Phone [Text]rr_PerformanceAvailabilityPhone1-888-972-8696
Performance Additional Market Index [Text]rr_PerformanceAdditionalMarketIndexAverage annual total returns Performance of a broad-based market index is included for comparison.
Performance Table Uses Highest Federal Raterr_PerformanceTableUsesHighestFederalRateAfter-tax returns 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 Deferredrr_PerformanceTableNotRelevantToTaxDeferredYour 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, Returns for Class Not Offered in Prospectus [Text]rr_BarChartReturnsForClassNotOfferedInProspectusClass I shares were first offered on August 27, 2007; the returns prior to this date are those of Class A shares that have been recalculated to apply the fees and expenses of Class I shares.
Annual Total Returnsrr_BarChartTableAbstract 
Bar Chart [Heading]rr_BarChartHeadingCalendar 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, 2011 was 1.05%.

Best quarter: Q2 ’09, 29.46%

Worst quarter: Q4 ’08, -30.23%

Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Captionrr_AverageAnnualReturnCaptionAverage annual total returns (%) as of 12-31-10
John Hancock High Yield Fund | Prospectus Class I Shares | Class I
 
Risk/Return:rr_RiskReturnAbstract 
Trading Symboldei_TradingSymbolJYHIX
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Column [Text]rr_ShareholderFeesColumnNameClass I
Maximum front-end sales charge (load) on purchases as a % of purchase pricerr_MaximumCumulativeSalesChargeOverOther none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is lessrr_MaximumDeferredSalesChargeOverOther none
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Column [Text]rr_OperatingExpensesColumnNameClass I
Management feerr_ManagementFeesOverAssets0.51%
Other expensesrr_OtherExpensesOverAssets0.17%[2]
Total annual fund operating expensesrr_ExpensesOverAssets0.68%
Expense examplerr_ExpenseExampleAbstract 
Expense Example, By Year, Column [Text]rr_ExpenseExampleByYearColumnNameClass I
1 Yearrr_ExpenseExampleYear0169
3 Yearsrr_ExpenseExampleYear03218
5 Yearsrr_ExpenseExampleYear05379
10 Yearsrr_ExpenseExampleYear10847
Annual Total Returnsrr_BarChartTableAbstract 
2001rr_AnnualReturn20011.16%
2002rr_AnnualReturn20020.83%
2003rr_AnnualReturn200340.46%
2004rr_AnnualReturn20049.38%
2005rr_AnnualReturn20053.97%
2006rr_AnnualReturn200620.71%
2007rr_AnnualReturn2007(0.95%)
2008rr_AnnualReturn2008(48.30%)
2009rr_AnnualReturn200970.15%
2010rr_AnnualReturn201025.31%
Year to Date Return, Labelrr_YearToDateReturnLabelYear-to-date total return The fund’s total return for the six months ended
Bar Chart, Year to Date Return, Daterr_BarChartYearToDateReturnDateJun. 30, 2011
Bar Chart, Year to Date Returnrr_BarChartYearToDateReturn1.05%
Highest Quarterly Return, Labelrr_HighestQuarterlyReturnLabelBest quarter:
Highest Quarterly Return, Daterr_BarChartHighestQuarterlyReturnDateJun. 30, 2009
Highest Quarterly Returnrr_BarChartHighestQuarterlyReturn29.46%
Lowest Quarterly Return, Labelrr_LowestQuarterlyReturnLabelWorst quarter:
Lowest Quarterly Return, Daterr_BarChartLowestQuarterlyReturnDateDec. 31, 2008
Lowest Quarterly Returnrr_BarChartLowestQuarterlyReturn(30.23%)
John Hancock High Yield Fund | Prospectus Class I Shares | before tax | Class I
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass I
Labelrr_AverageAnnualReturnLabelbefore tax
1 Yearrr_AverageAnnualReturnYear0125.31%
5 Yearrr_AverageAnnualReturnYear055.68%
10 Yearrr_AverageAnnualReturnYear107.94%
John Hancock High Yield Fund | Prospectus Class I Shares | After tax on distributions | Class I
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass I
Labelrr_AverageAnnualReturnLabelAfter tax on distributions
1 Yearrr_AverageAnnualReturnYear0121.37%
5 Yearrr_AverageAnnualReturnYear051.83%
10 Yearrr_AverageAnnualReturnYear104.11%
John Hancock High Yield Fund | Prospectus Class I Shares | After tax on distributions, with sale | Class I
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass I
Labelrr_AverageAnnualReturnLabelAfter tax on distributions, with sale
1 Yearrr_AverageAnnualReturnYear0116.23%
5 Yearrr_AverageAnnualReturnYear052.42%
10 Yearrr_AverageAnnualReturnYear104.39%
John Hancock High Yield Fund | Prospectus Class I Shares | Bank of America Merrill Lynch US High Yield Master II Index
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Labelrr_AverageAnnualReturnLabelBank of America Merrill Lynch US High Yield Master II Index
1 Yearrr_AverageAnnualReturnYear0115.19%
5 Yearrr_AverageAnnualReturnYear058.82%
10 Yearrr_AverageAnnualReturnYear108.60%
John Hancock High Yield Fund | Prospectus Class R6 Shares
 
Risk/Return:rr_RiskReturnAbstract 
Risk/Return [Heading]rr_RiskReturnHeadingJOHN HANCOCK HIGH YIELD FUND
Objective [Heading]rr_ObjectiveHeadingInvestment objective
Objective, Primary [Text Block]rr_ObjectivePrimaryTextBlockTo seek high current income.
Objective, Secondary [Text Block]rr_ObjectiveSecondaryTextBlockCapital appreciation is a secondary goal.
Fees and expensesjhbt315554_FundFeesAndExpensesAbstract 
Expense [Heading]rr_ExpenseHeadingFees and expenses
Expense Narrative [Text Block]rr_ExpenseNarrativeTextBlockThis table describes the fees and expenses you may pay if you buy and hold shares of the fund.
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Caption [Text]rr_ShareholderFeesCaptionShareholder fees (%) (fees paid directly from your investment)
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Caption [Text]rr_OperatingExpensesCaptionAnnual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)
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 R6 shares.
Expense examplerr_ExpenseExampleAbstract 
Expense Example [Heading]rr_ExpenseExampleHeadingExpense example
Expense Example Narrative [Text Block]rr_ExpenseExampleNarrativeTextBlockThis 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 $10,000 investment at the end of the various time frames indicated. The example assumes a 5% average annual return. The example assumes fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example by Year [Heading]rr_ExpenseExampleByYearHeadingExpenses ($)
Portfolio turnoverjhbt315554_PortfolioTurnoverAltAbstract 
Portfolio Turnover [Heading]rr_PortfolioTurnoverHeadingPortfolio turnover
Portfolio Turnover [Text Block]rr_PortfolioTurnoverTextBlockThe 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 51% of the average value of its portfolio.
Portfolio Turnover, Raterr_PortfolioTurnoverRate51.00%
Strategy [Heading]rr_StrategyHeadingPrincipal 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 U.S. and foreign fixed-income securities rated BB/Ba or lower and their unrated equivalents. These may include, but are not limited to, domestic and foreign corporate bonds, debentures and notes, convertible securities, preferred securities and domestic and foreign government obligations. No more than 10% of the fund’s total assets may be invested in securities that, at the time of purchase, are rated in default by Standard & Poor’s (S&P) or by Moody’s Investors Service (Moody’s). There is no limit on the fund’s average maturity.

In managing the fund’s portfolio, the subadviser concentrates on industry allocation and securities selection, deciding which types of industries to emphasize at a given time and then which individual securities to buy. The subadviser uses top-down analysis to determine which industries may benefit from current and future changes in the economy.

The fund may hold up to 20% of its total assets in the securities of companies in any one industry and up to 10% of its total assets in the securities of any individual issuer.

In choosing individual securities, the subadviser uses bottom-up research to find securities that appear comparatively undervalued. The subadviser looks at the financial condition of the issuers, as well as the collateralization and other features of the securities themselves. The fund typically invests in a broad range of industries.

The fund may use certain higher-risk investments, including restricted or illiquid securities and derivatives, which include futures contracts on securities, indexes and foreign currency; options on futures contracts, securities, indexes and foreign currency; interest rate, foreign currency and credit default swaps; and foreign currency forward contracts, in each case, for the purposes of reducing risk, obtaining efficient market exposure and/or enhancing investment returns. In addition, the fund may invest up to 20% of its assets in U.S. and foreign common stocks of companies of any size.

Risk [Heading]rr_RiskHeadingPrincipal 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 United States 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 subadviser’s investment strategy may fail to produce the intended result.

Changing distribution levels risk The amount of the distributions paid by the fund generally depends on the amount of income and/or dividends received by the fund on the securities it holds. As a result of market, interest rate and other circumstances, the amount of cash available for distribution by the fund and the fund’s distribution rate may vary or decline. The risk of such variability is accentuated in currently prevailing market and interest rate circumstances.

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 to honor its obligations. 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.

Equity securities risk The value of a company’s equity securities is subject to changes in the company’s financial condition, and overall market and economic conditions.

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 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.

Foreign securities risk As compared to U.S. companies, there may be less publicly available information relating to foreign companies. Foreign securities may be subject to foreign taxes. The value of foreign securities is subject to currency fluctuations and adverse political and economic developments.

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 the derivatives and other strategic transactions in which the fund intends to invest and the main risks associated with each of them:
 
Credit default swaps Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), interest-rate risk, risk of default of the underlying reference obligation and risk of disproportionate loss are the principal risks of engaging in transactions involving credit default swaps.
 
Foreign currency forward contracts Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), foreign currency risk and risk of disproportionate loss are the principal risks of engaging in transactions involving foreign currency forward contracts.
 
Foreign currency swaps Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), foreign currency risk and risk of disproportionate loss are the principal risks of engaging in transactions involving foreign currency swaps.
 
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.
 
Interest-rate swaps Counterparty risk, liquidity risk (i.e., the inability to enter into closing transactions), interest-rate risk and risk of disproportionate loss are the principal risks of engaging in transactions involving interest-rate swaps.
 
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.

Issuer risk An issuer of a security may perform poorly and, therefore, the value of its stocks and bonds may decline. An issuer of securities held by the fund could default or have its credit rating downgraded.

Liquidity risk Exposure exists when trading volume, lack of a market maker or legal restrictions impair the ability to sell particular securities or close derivative positions at an advantageous price.

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.

Medium and smaller company risk The prices of medium and smaller company stocks can change more frequently and dramatically than those of large company stocks. For purposes of the fund’s investment policies, the market capitalization of a company is based on its market capitalization at the time the fund purchases the company’s securities. Market capitalizations of companies change over time.

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.

Risk Not Insured Depository Institution [Text]rr_RiskNotInsuredDepositoryInstitutionAn 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 Lose Money [Text]rr_RiskLoseMoneyThe fund’s shares will go up and down in price, meaning that you could lose money by investing in the fund.
Past performancejhbt315554_FundPastPerformanceAbstract 
Bar Chart and Performance Table [Heading]rr_BarChartAndPerformanceTableHeadingPast 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 Web site: www.jhfunds.com/InstitutionalPerformance, or by calling Signature Services at 1-888-972-8696 between 8:00 A.M. and 7:00 P.M., Eastern Time, on most business days.

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

After-tax returns These 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.

Because Class R6 shares of the fund have not commenced operations as of the date of this prospectus, the returns are those of Class A shares that have been recalculated to apply the estimated fees and expenses of Class R6 shares.

Performance Information Illustrates Variability of Returns [Text]rr_PerformanceInformationIllustratesVariabilityOfReturnsThe 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 Past Does Not Indicate Future [Text]rr_PerformancePastDoesNotIndicateFutureHowever, past performance (before and after taxes) does not indicate future results.
Performance Table Closing [Text Block]rr_PerformanceTableClosingTextBlockPerformance for the fund is updated daily, monthly and quarterly and may be obtained at our Web site: www.jhfunds.com/InstitutionalPerformance, or by calling Signature Services at 1-888-972-8696 between 8:00 A.M. and 7:00 P.M., Eastern Time, on most business days.
Performance Availability Website Address [Text]rr_PerformanceAvailabilityWebSiteAddresswww.jhfunds.com/InstitutionalPerformance
Performance Availability Phone [Text]rr_PerformanceAvailabilityPhone1-888-972-8696
Performance Additional Market Index [Text]rr_PerformanceAdditionalMarketIndexAverage annual total returns Performance of a broad-based market index is included for comparison.
Performance Table Uses Highest Federal Raterr_PerformanceTableUsesHighestFederalRateAfter-tax returns These 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 Deferredrr_PerformanceTableNotRelevantToTaxDeferredYour 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, Returns for Class Not Offered in Prospectus [Text]rr_BarChartReturnsForClassNotOfferedInProspectusBecause Class R6 shares of the fund have not commenced operations as of the date of this prospectus, the returns are those of Class A shares that have been recalculated to apply the estimated fees and expenses of Class R6 shares.
Annual Total Returnsrr_BarChartTableAbstract 
Bar Chart [Heading]rr_BarChartHeadingCalendar year total returns — Class R6 (%)
Bar Chart Closing [Text Block]rr_BarChartClosingTextBlock

Year-to-date total return The fund’s total return for the six months ended June 30, 2011 was 1.05%.

Best quarter: Q3 ’09, 29.39%

Worst quarter: Q4 ’08, -30.23%

Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Captionrr_AverageAnnualReturnCaptionAverage annual total returns (%) as of 12-31-10
John Hancock High Yield Fund | Prospectus Class R6 Shares | Class R6
 
Risk/Return:rr_RiskReturnAbstract 
Trading Symboldei_TradingSymbolJHRYX
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Column [Text]rr_ShareholderFeesColumnNameClass R6
Maximum front-end sales charge (load) on purchases as a % of purchase pricerr_MaximumCumulativeSalesChargeOverOther none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is lessrr_MaximumDeferredSalesChargeOverOther none
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Column [Text]rr_OperatingExpensesColumnNameClass R6
Management feerr_ManagementFeesOverAssets0.51%
Other expensesrr_OtherExpensesOverAssets0.12%[4]
Total annual fund operating expensesrr_ExpensesOverAssets0.63%
Expense examplerr_ExpenseExampleAbstract 
Expense Example, By Year, Column [Text]rr_ExpenseExampleByYearColumnNameClass R6
1 Yearrr_ExpenseExampleYear0164
3 Yearsrr_ExpenseExampleYear03202
Annual Total Returnsrr_BarChartTableAbstract 
2001rr_AnnualReturn20011.15%
2002rr_AnnualReturn20020.82%
2003rr_AnnualReturn200340.45%
2004rr_AnnualReturn20049.37%
2005rr_AnnualReturn20053.96%
2006rr_AnnualReturn200620.70%
2007rr_AnnualReturn2007(0.88%)
2008rr_AnnualReturn2008(48.28%)
2009rr_AnnualReturn200970.25%
2010rr_AnnualReturn201025.36%
Year to Date Return, Labelrr_YearToDateReturnLabelYear-to-date total return for the six months ended
Bar Chart, Year to Date Return, Daterr_BarChartYearToDateReturnDateJun. 30, 2011
Bar Chart, Year to Date Returnrr_BarChartYearToDateReturn1.05%
Highest Quarterly Return, Labelrr_HighestQuarterlyReturnLabelBest quarter:
Highest Quarterly Return, Daterr_BarChartHighestQuarterlyReturnDateSep. 30, 2009
Highest Quarterly Returnrr_BarChartHighestQuarterlyReturn29.39%
Lowest Quarterly Return, Labelrr_LowestQuarterlyReturnLabelWorst quarter:
Lowest Quarterly Return, Daterr_BarChartLowestQuarterlyReturnDateDec. 31, 2008
Lowest Quarterly Returnrr_BarChartLowestQuarterlyReturn(30.23%)
John Hancock High Yield Fund | Prospectus Class R6 Shares | before tax | Class R6
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass R6
Labelrr_AverageAnnualReturnLabelbefore tax
1 Yearrr_AverageAnnualReturnYear0125.36%
5 Yearrr_AverageAnnualReturnYear055.72%
10 Yearrr_AverageAnnualReturnYear107.96%
John Hancock High Yield Fund | Prospectus Class R6 Shares | After tax on distributions | Class R6
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass R6
Labelrr_AverageAnnualReturnLabelAfter tax on distributions
1 Yearrr_AverageAnnualReturnYear0121.58%
5 Yearrr_AverageAnnualReturnYear051.94%
10 Yearrr_AverageAnnualReturnYear104.17%
John Hancock High Yield Fund | Prospectus Class R6 Shares | After tax on distributions, with sale | Class R6
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass R6
Labelrr_AverageAnnualReturnLabelAfter tax on distributions, with sale
1 Yearrr_AverageAnnualReturnYear0116.27%
5 Yearrr_AverageAnnualReturnYear052.50%
10 Yearrr_AverageAnnualReturnYear104.43%
John Hancock High Yield Fund | Prospectus Class R6 Shares | Bank of America Merrill Lynch US High Yield Master II Index
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Labelrr_AverageAnnualReturnLabelBank of America Merrill Lynch US High Yield Master II Index
1 Yearrr_AverageAnnualReturnYear0115.19%
5 Yearrr_AverageAnnualReturnYear058.82%
10 Yearrr_AverageAnnualReturnYear108.60%
John Hancock Investment Grade Bond Fund | Prospectus Class A, B and C Shares
 
Risk/Return:rr_RiskReturnAbstract 
Risk/Return [Heading]rr_RiskReturnHeadingJOHN HANCOCK INVESTMENT GRADE BOND FUND
Objective [Heading]rr_ObjectiveHeadingInvestment objective
Objective, Primary [Text Block]rr_ObjectivePrimaryTextBlockTo seek a high level of current income consistent with preservation of capital and maintenance of liquidity.
Fees and expensesjhbt315554_FundFeesAndExpensesAbstract 
Expense [Heading]rr_ExpenseHeadingFees and expenses
Expense Narrative [Text Block]rr_ExpenseNarrativeTextBlockThis 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 14 to 16 of the prospectus under “Sales charge reductions and waivers” or pages 94 to 98 of the fund’s statement of additional information under “Initial Sales Charge on Class A Shares.”
Expense Breakpoint Discountsjhbt315554_ExpenseBreakpointDiscountsAbstract 
Expense Breakpoint Discounts [Text]rr_ExpenseBreakpointDiscountsYou 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 14 to 16 of the prospectus under “Sales charge reductions and waivers” or pages 94 to 98 of the fund’s statement of additional information under “Initial Sales Charge on Class A Shares.”
Expense Breakpoint, Minimum Investment Required [Amount]rr_ExpenseBreakpointMinimumInvestmentRequiredAmount100,000
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Caption [Text]rr_ShareholderFeesCaptionShareholder fees (%) (fees paid directly from your investment)
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Caption [Text]rr_OperatingExpensesCaptionAnnual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)
Expenses Restated to Reflect Current [Text]rr_ExpensesRestatedToReflectCurrent"Other expenses" have been restated to reflect current transfer agency and service fees.
Fee Waiver or Reimbursement over Assets, Date of Terminationrr_FeeWaiverOrReimbursementOverAssetsDateOfTerminationSeptember 30, 2012
Expense examplerr_ExpenseExampleAbstract 
Expense Example [Heading]rr_ExpenseExampleHeadingExpense example
Expense Example Narrative [Text Block]rr_ExpenseExampleNarrativeTextBlockThis 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 $10,000 investment in the fund for the time periods indicated (Kept column) and then assuming a redemption of all of your shares at the end of those periods (Sold column). The example assumes a 5% average annual return. The example assumes fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example by Year [Heading]rr_ExpenseExampleByYearHeadingExpenses ($)
Expense Example by, Year, Caption [Text]rr_ExpenseExampleByYearCaptionSold
Expense Example, No Redemptionrr_ExpenseExampleNoRedemptionAbstract 
Expense Example, No Redemption, By Year, Caption [Text]rr_ExpenseExampleNoRedemptionByYearCaptionKept
Portfolio turnoverjhbt315554_PortfolioTurnoverAltAbstract 
Portfolio Turnover [Heading]rr_PortfolioTurnoverHeadingPortfolio turnover
Portfolio Turnover [Text Block]rr_PortfolioTurnoverTextBlockThe 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 105% of the average value of its portfolio.
Portfolio Turnover, Raterr_PortfolioTurnoverRate105.00%
Strategy [Heading]rr_StrategyHeadingPrincipal 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 investment-grade bonds (securities rated from AAA to BBB). These may include, but are not limited to, corporate bonds and debentures, as well as U.S. government and agency securities. Although the fund may invest in bonds of any maturity, it maintains a dollar-weighted average maturity of between three and ten years.

In managing the fund’s portfolio, the subadviser concentrates on sector allocation, industry allocation and security selection, deciding which types of bonds and industries to emphasize at a given time, and then which individual bonds to buy. When making sector and industry allocations, the subadviser tries to anticipate shifts in the business cycle by using top-down analysis to determine which sectors and industries may benefit over the next 12 months.

In choosing individual securities, the subadviser uses bottom-up research to find securities that appear comparatively undervalued. The subadviser looks at bonds of many different issuers, potentially including U.S. dollar-denominated securities of foreign governments and corporations.

The fund may invest in mortgage-related securities and may engage in derivative transactions that include futures contracts and options, in each case, for the purposes of reducing risk, obtaining efficient market exposure and/or enhancing investment returns. The fund’s investments in U.S. government and agency securities may or may not be supported by the full faith and credit of the United States.

Risk [Heading]rr_RiskHeadingPrincipal 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 United States 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 subadviser’s investment strategy may fail to produce the intended result.

Changing distribution levels risk The amount of the distributions paid by the fund generally depends on the amount of income and/or dividends received by the fund on the securities it holds.

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 to 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.

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 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.

Foreign securities risk As compared to U.S. companies, there may be less publicly available information relating to foreign companies. Foreign securities may be subject to foreign taxes. The value of foreign securities is subject to currency fluctuations and adverse political and economic developments.

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 the 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.
 
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.

High portfolio turnover risk Actively trading securities can increase transaction costs (thus lowering performance) and taxable distributions.

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.

Mortgage-backed and asset-backed securities risk Different types of mortgage-backed securities and asset-backed securities are subject to different combinations of prepayment, extension, interest-rate and/or other market risks.

Risk Not Insured Depository Institution [Text]rr_RiskNotInsuredDepositoryInstitutionAn 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 Lose Money [Text]rr_RiskLoseMoneyThe fund’s shares will go up and down in price, meaning that you could lose money by investing in the fund.
Past performancejhbt315554_FundPastPerformanceAbstract 
Bar Chart and Performance Table [Heading]rr_BarChartAndPerformanceTableHeadingPast 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 Web site: www.jhfunds.com/FundPerformance, or by calling Signature Services at 1-800-225-5291 between 8:00 A.M. and 7:00 P.M., Eastern Time, on most business days.

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.

Performance Information Illustrates Variability of Returns [Text]rr_PerformanceInformationIllustratesVariabilityOfReturnsThe 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 Past Does Not Indicate Future [Text]rr_PerformancePastDoesNotIndicateFutureHowever, past performance (before and after taxes) does not indicate future results.
Performance Table Closing [Text Block]rr_PerformanceTableClosingTextBlockPerformance for the fund is updated daily, monthly and quarterly and may be obtained at our Web site: www.jhfunds.com/FundPerformance, or by calling Signature Services at 1-800-225-5291 between 8:00 A.M. and 7:00 P.M., Eastern Time, on most business days.
Performance Availability Website Address [Text]rr_PerformanceAvailabilityWebSiteAddresswww.jhfunds.com/FundPerformance
Performance Availability Phone [Text]rr_PerformanceAvailabilityPhone1-800-225-5291
Bar Chart Does Not Reflect Sales Loads [Text]rr_BarChartDoesNotReflectSalesLoadsCalendar year total returns These do not include sales charges and would have been lower if they did.
Performance Additional Market Index [Text]rr_PerformanceAdditionalMarketIndexAverage annual total returns Performance of a broad-based market index is included for comparison.
Performance Table One Class of after Tax Shown [Text]rr_PerformanceTableOneClassOfAfterTaxShownAfter-tax returns These are shown only for Class A shares and would be different for other classes.
Performance Table Uses Highest Federal Raterr_PerformanceTableUsesHighestFederalRateThey 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 Deferredrr_PerformanceTableNotRelevantToTaxDeferredYour 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.
Annual Total Returnsrr_BarChartTableAbstract 
Bar Chart [Heading]rr_BarChartHeadingCalendar 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, 2011 was 3.23%.

Best quarter: Q3 ’09, 8.18%

Worst quarter: Q4 ’08, -3.35%

Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Captionrr_AverageAnnualReturnCaptionAverage annual total returns (%) as of 12-31-10
John Hancock Investment Grade Bond Fund | Prospectus Class A, B and C Shares | Class A
 
Risk/Return:rr_RiskReturnAbstract 
Trading Symboldei_TradingSymbolTAUSX
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Column [Text]rr_ShareholderFeesColumnNameClass A
Maximum front-end sales charge (load) on purchases as a % of purchase pricerr_MaximumCumulativeSalesChargeOverOther4.50%
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is lessrr_MaximumDeferredSalesChargeOverOther1.00%[1]
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Column [Text]rr_OperatingExpensesColumnNameClass A
Management feerr_ManagementFeesOverAssets0.40%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets0.25%
Other expensesrr_OtherExpensesOverAssets0.35%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.00%
Contractual expense reimbursementrr_FeeWaiverOrReimbursementOverAssets(0.02%)[5]
Total annual fund operating expenses after expense reimbursementsrr_NetExpensesOverAssets0.98%
Expense examplerr_ExpenseExampleAbstract 
Expense Example, By Year, Column [Text]rr_ExpenseExampleByYearColumnNameClass A
1 Yearrr_ExpenseExampleYear01545
3 Yearsrr_ExpenseExampleYear03752
5 Yearsrr_ExpenseExampleYear05976
10 Yearsrr_ExpenseExampleYear101,618
Expense Example, No Redemptionrr_ExpenseExampleNoRedemptionAbstract 
Expense Example, No Redemption, By Year, Column [Text]rr_ExpenseExampleNoRedemptionByYearColumnNameClass A
1 Yearrr_ExpenseExampleNoRedemptionYear01545
3 Yearsrr_ExpenseExampleNoRedemptionYear03752
5 Yearsrr_ExpenseExampleNoRedemptionYear05976
10 Yearsrr_ExpenseExampleNoRedemptionYear101,618
Annual Total Returnsrr_BarChartTableAbstract 
2001rr_AnnualReturn20017.23%
2002rr_AnnualReturn20029.61%
2003rr_AnnualReturn20034.62%
2004rr_AnnualReturn20043.60%
2005rr_AnnualReturn20051.59%
2006rr_AnnualReturn20064.37%
2007rr_AnnualReturn20075.33%
2008rr_AnnualReturn2008(6.63%)
2009rr_AnnualReturn200919.16%
2010rr_AnnualReturn201010.08%
Year to Date Return, Labelrr_YearToDateReturnLabelYear-to-date total return The fund’s total return for the six months ended
Bar Chart, Year to Date Return, Daterr_BarChartYearToDateReturnDateJun. 30, 2011
Bar Chart, Year to Date Returnrr_BarChartYearToDateReturn3.23%
Highest Quarterly Return, Labelrr_HighestQuarterlyReturnLabelBest quarter:
Highest Quarterly Return, Daterr_BarChartHighestQuarterlyReturnDateSep. 30, 2009
Highest Quarterly Returnrr_BarChartHighestQuarterlyReturn8.18%
Lowest Quarterly Return, Labelrr_LowestQuarterlyReturnLabelWorst quarter:
Lowest Quarterly Return, Daterr_BarChartLowestQuarterlyReturnDateDec. 31, 2008
Lowest Quarterly Returnrr_BarChartLowestQuarterlyReturn(3.35%)
John Hancock Investment Grade Bond Fund | Prospectus Class A, B and C Shares | Class B
 
Risk/Return:rr_RiskReturnAbstract 
Trading Symboldei_TradingSymbolTSUSX
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Column [Text]rr_ShareholderFeesColumnNameClass B
Maximum front-end sales charge (load) on purchases as a % of purchase pricerr_MaximumCumulativeSalesChargeOverOther 
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is lessrr_MaximumDeferredSalesChargeOverOther5.00%
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Column [Text]rr_OperatingExpensesColumnNameClass B
Management feerr_ManagementFeesOverAssets0.40%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets1.00%
Other expensesrr_OtherExpensesOverAssets0.35%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.75%
Contractual expense reimbursementrr_FeeWaiverOrReimbursementOverAssets(0.02%)[5]
Total annual fund operating expenses after expense reimbursementsrr_NetExpensesOverAssets1.73%
Expense examplerr_ExpenseExampleAbstract 
Expense Example, By Year, Column [Text]rr_ExpenseExampleByYearColumnNameClass B
1 Yearrr_ExpenseExampleYear01676
3 Yearsrr_ExpenseExampleYear03849
5 Yearsrr_ExpenseExampleYear051,147
10 Yearsrr_ExpenseExampleYear101,863
Expense Example, No Redemptionrr_ExpenseExampleNoRedemptionAbstract 
Expense Example, No Redemption, By Year, Column [Text]rr_ExpenseExampleNoRedemptionByYearColumnNameClass B
1 Yearrr_ExpenseExampleNoRedemptionYear01176
3 Yearsrr_ExpenseExampleNoRedemptionYear03549
5 Yearsrr_ExpenseExampleNoRedemptionYear05947
10 Yearsrr_ExpenseExampleNoRedemptionYear101,863
John Hancock Investment Grade Bond Fund | Prospectus Class A, B and C Shares | Class C
 
Risk/Return:rr_RiskReturnAbstract 
Trading Symboldei_TradingSymbolTCUSX
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Column [Text]rr_ShareholderFeesColumnNameClass C
Maximum front-end sales charge (load) on purchases as a % of purchase pricerr_MaximumCumulativeSalesChargeOverOther 
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is lessrr_MaximumDeferredSalesChargeOverOther1.00%
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Column [Text]rr_OperatingExpensesColumnNameClass C
Management feerr_ManagementFeesOverAssets0.40%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets1.00%
Other expensesrr_OtherExpensesOverAssets0.35%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.75%
Contractual expense reimbursementrr_FeeWaiverOrReimbursementOverAssets(0.02%)[5]
Total annual fund operating expenses after expense reimbursementsrr_NetExpensesOverAssets1.73%
Expense examplerr_ExpenseExampleAbstract 
Expense Example, By Year, Column [Text]rr_ExpenseExampleByYearColumnNameClass C
1 Yearrr_ExpenseExampleYear01276
3 Yearsrr_ExpenseExampleYear03549
5 Yearsrr_ExpenseExampleYear05947
10 Yearsrr_ExpenseExampleYear102,061
Expense Example, No Redemptionrr_ExpenseExampleNoRedemptionAbstract 
Expense Example, No Redemption, By Year, Column [Text]rr_ExpenseExampleNoRedemptionByYearColumnNameClass C
1 Yearrr_ExpenseExampleNoRedemptionYear01176
3 Yearsrr_ExpenseExampleNoRedemptionYear03549
5 Yearsrr_ExpenseExampleNoRedemptionYear05947
10 Yearsrr_ExpenseExampleNoRedemptionYear102,061
John Hancock Investment Grade Bond Fund | Prospectus Class A, B and C Shares | before tax | Class A
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass A
Labelrr_AverageAnnualReturnLabelbefore tax
1 Yearrr_AverageAnnualReturnYear015.12%
5 Yearrr_AverageAnnualReturnYear055.16%
10 Yearrr_AverageAnnualReturnYear105.23%
John Hancock Investment Grade Bond Fund | Prospectus Class A, B and C Shares | before tax | Class B
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass B
Labelrr_AverageAnnualReturnLabelbefore tax
1 Yearrr_AverageAnnualReturnYear014.26%
5 Yearrr_AverageAnnualReturnYear055.02%
10 Yearrr_AverageAnnualReturnYear105.08%
John Hancock Investment Grade Bond Fund | Prospectus Class A, B and C Shares | before tax | Class C
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass C
Labelrr_AverageAnnualReturnLabelbefore tax
1 Yearrr_AverageAnnualReturnYear018.26%
5 Yearrr_AverageAnnualReturnYear055.34%
10 Yearrr_AverageAnnualReturnYear104.92%
John Hancock Investment Grade Bond Fund | Prospectus Class A, B and C Shares | After tax on distributions | Class A
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass A
Labelrr_AverageAnnualReturnLabelAfter tax on distributions
1 Yearrr_AverageAnnualReturnYear013.44%
5 Yearrr_AverageAnnualReturnYear053.31%
10 Yearrr_AverageAnnualReturnYear103.38%
John Hancock Investment Grade Bond Fund | Prospectus Class A, B and C Shares | After tax on distributions, with sale | Class A
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass A
Labelrr_AverageAnnualReturnLabelAfter tax on distributions, with sale
1 Yearrr_AverageAnnualReturnYear013.29%
5 Yearrr_AverageAnnualReturnYear053.29%
10 Yearrr_AverageAnnualReturnYear103.34%
John Hancock Investment Grade Bond Fund | Prospectus Class A, B and C Shares | Barclays Capital U.S. Aggregate Bond Index
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Labelrr_AverageAnnualReturnLabelBarclays Capital U.S. Aggregate Bond Index
1 Yearrr_AverageAnnualReturnYear016.54%
5 Yearrr_AverageAnnualReturnYear055.80%
10 Yearrr_AverageAnnualReturnYear105.84%
John Hancock Investment Grade Bond Fund | Prospectus Class I Shares
 
Risk/Return:rr_RiskReturnAbstract 
Risk/Return [Heading]rr_RiskReturnHeadingJOHN HANCOCK INVESTMENT GRADE BOND FUND
Objective [Heading]rr_ObjectiveHeadingInvestment objective
Objective, Primary [Text Block]rr_ObjectivePrimaryTextBlockTo seek a high level of current income consistent with preservation of capital and maintenance of liquidity.
Fees and expensesjhbt315554_FundFeesAndExpensesAbstract 
Expense [Heading]rr_ExpenseHeadingFees and expenses
Expense Narrative [Text Block]rr_ExpenseNarrativeTextBlockThis table describes the fees and expenses you may pay if you buy and hold shares of the fund.
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Caption [Text]rr_ShareholderFeesCaptionShareholder fees (%) (fees paid directly from your investment)
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Caption [Text]rr_OperatingExpensesCaptionAnnual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)
Expenses Restated to Reflect Current [Text]rr_ExpensesRestatedToReflectCurrent"Other expenses" have been restated to reflect current transfer agency and service fees.
Expense examplerr_ExpenseExampleAbstract 
Expense Example [Heading]rr_ExpenseExampleHeadingExpense example
Expense Example Narrative [Text Block]rr_ExpenseExampleNarrativeTextBlockThis 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 $10,000 investment at the end of the various time frames indicated. The example assumes a 5% average annual return. The example assumes fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example by Year [Heading]rr_ExpenseExampleByYearHeadingExpenses ($)
Portfolio turnoverjhbt315554_PortfolioTurnoverAltAbstract 
Portfolio Turnover [Heading]rr_PortfolioTurnoverHeadingPortfolio turnover
Portfolio Turnover [Text Block]rr_PortfolioTurnoverTextBlockThe 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 105% of the average value of its portfolio.
Portfolio Turnover, Raterr_PortfolioTurnoverRate105.00%
Strategy [Heading]rr_StrategyHeadingPrincipal 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 investment-grade bonds (securities rated from AAA to BBB). These may include, but are not limited to, corporate bonds and debentures, as well as U.S. government and agency securities. Although the fund may invest in bonds of any maturity, it maintains a dollar-weighted average maturity of between three and ten years.

In managing the fund’s portfolio, the subadviser concentrates on sector allocation, industry allocation and security selection, deciding which types of bonds and industries to emphasize at a given time, and then which individual bonds to buy. When making sector and industry allocations, the subadviser tries to anticipate shifts in the business cycle by using top-down analysis to determine which sectors and industries may benefit over the next 12 months.

In choosing individual securities, the subadviser uses bottom-up research to find securities that appear comparatively undervalued. The subadviser looks at bonds of many different issuers, potentially including U.S. dollar-denominated securities of foreign governments and corporations.

The fund may invest in mortgage-related securities and may engage in derivative transactions that include futures contracts and options, in each case, for the purposes of reducing risk, obtaining efficient market exposure and/or enhancing investment returns. The fund’s investments in U.S. government and agency securities may or may not be supported by the full faith and credit of the United States.

Risk [Heading]rr_RiskHeadingPrincipal 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 United States 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 5 of the prospectus.

Active management risk The subadviser’s investment strategy may fail to produce the intended result.

Changing distribution levels risk The amount of the distributions paid by the fund generally depends on the amount of income and/or dividends received by the fund on the securities it holds.

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 to 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.

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 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.

Foreign securities risk As compared to U.S. companies, there may be less publicly available information relating to foreign companies. Foreign securities may be subject to foreign taxes. The value of foreign securities is subject to currency fluctuations and adverse political and economic developments.

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 the 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.
 
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.

High portfolio turnover risk Actively trading securities can increase transaction costs (thus lowering performance) and taxable distributions.

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.

Mortgage-backed and asset-backed securities risk Different types of mortgage-backed securities and asset-backed securities are subject to different combinations of prepayment, extension, interest-rate and/or other market risks.

Risk Not Insured Depository Institution [Text]rr_RiskNotInsuredDepositoryInstitutionAn 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 Lose Money [Text]rr_RiskLoseMoneyThe fund’s shares will go up and down in price, meaning that you could lose money by investing in the fund.
Past performancejhbt315554_FundPastPerformanceAbstract 
Bar Chart and Performance Table [Heading]rr_BarChartAndPerformanceTableHeadingPast 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 Web site: www.jhfunds.com/InstitutionalPerformance, or by calling Signature Services at 1-888-972-8696 between 8:00 A.M. and 7:00 P.M., Eastern Time, on most business days.

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

After-tax returns 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.

December 31, 1991 is the inception date for the oldest class of shares, Class A shares. Class I shares were first offered on July 28, 2003; the returns prior to this date are those of Class A shares that have been recalculated to apply the fees and expenses of Class I shares.

Performance Information Illustrates Variability of Returns [Text]rr_PerformanceInformationIllustratesVariabilityOfReturnsThe 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 Past Does Not Indicate Future [Text]rr_PerformancePastDoesNotIndicateFutureHowever, past performance (before and after taxes) does not indicate future results.
Performance Table Closing [Text Block]rr_PerformanceTableClosingTextBlockPerformance for the fund is updated daily, monthly and quarterly and may be obtained at our Web site: www.jhfunds.com/InstitutionalPerformance, or by calling Signature Services at 1-888-972-8696 between 8:00 A.M. and 7:00 P.M., Eastern Time, on most business days.
Performance Availability Website Address [Text]rr_PerformanceAvailabilityWebSiteAddresswww.jhfunds.com/InstitutionalPerformance
Performance Availability Phone [Text]rr_PerformanceAvailabilityPhone1-888-972-8696
Performance Additional Market Index [Text]rr_PerformanceAdditionalMarketIndexAverage annual total returns Performance of a broad-based market index is included for comparison.
Performance Table Uses Highest Federal Raterr_PerformanceTableUsesHighestFederalRateAfter-tax returns 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 Deferredrr_PerformanceTableNotRelevantToTaxDeferredYour 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, Returns for Class Not Offered in Prospectus [Text]rr_BarChartReturnsForClassNotOfferedInProspectusClass I shares were first offered on July 28, 2003; the returns prior to this date are those of Class A shares that have been recalculated to apply the fees and expenses of Class I shares.
Annual Total Returnsrr_BarChartTableAbstract 
Bar Chart [Heading]rr_BarChartHeadingCalendar 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, 2011 was 3.44%.

Best quarter: Q3 ’09, 8.29%

Worst quarter: Q4 ’08, -3.38%

Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Captionrr_AverageAnnualReturnCaptionAverage annual total returns (%) as of 12-31-10
John Hancock Investment Grade Bond Fund | Prospectus Class I Shares | Class I
 
Risk/Return:rr_RiskReturnAbstract 
Trading Symboldei_TradingSymbolTIUSX
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Column [Text]rr_ShareholderFeesColumnNameClass I
Maximum front-end sales charge (load) on purchases as a % of purchase pricerr_MaximumCumulativeSalesChargeOverOther none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is lessrr_MaximumDeferredSalesChargeOverOther none
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Column [Text]rr_OperatingExpensesColumnNameClass I
Management feerr_ManagementFeesOverAssets0.40%
Other expensesrr_OtherExpensesOverAssets0.24%[2]
Total annual fund operating expensesrr_ExpensesOverAssets0.64%
Expense examplerr_ExpenseExampleAbstract 
Expense Example, By Year, Column [Text]rr_ExpenseExampleByYearColumnNameClass I
1 Yearrr_ExpenseExampleYear0165
3 Yearsrr_ExpenseExampleYear03205
5 Yearsrr_ExpenseExampleYear05357
10 Yearsrr_ExpenseExampleYear10 798
Annual Total Returnsrr_BarChartTableAbstract 
2001rr_AnnualReturn20017.74%
2002rr_AnnualReturn200210.10%
2003rr_AnnualReturn20035.15%
2004rr_AnnualReturn20044.05%
2005rr_AnnualReturn20052.04%
2006rr_AnnualReturn20064.77%
2007rr_AnnualReturn20075.69%
2008rr_AnnualReturn2008(6.41%)
2009rr_AnnualReturn200919.67%
2010rr_AnnualReturn201010.50%
Year to Date Return, Labelrr_YearToDateReturnLabelYear-to-date total return The fund’s total return for the six months ended
Bar Chart, Year to Date Return, Daterr_BarChartYearToDateReturnDateJun. 30, 2011
Bar Chart, Year to Date Returnrr_BarChartYearToDateReturn3.44%
Highest Quarterly Return, Labelrr_HighestQuarterlyReturnLabelBest quarter:
Highest Quarterly Return, Daterr_BarChartHighestQuarterlyReturnDateSep. 30, 2009
Highest Quarterly Returnrr_BarChartHighestQuarterlyReturn8.29%
Lowest Quarterly Return, Labelrr_LowestQuarterlyReturnLabelWorst quarter:
Lowest Quarterly Return, Daterr_BarChartLowestQuarterlyReturnDateDec. 31, 2008
Lowest Quarterly Returnrr_BarChartLowestQuarterlyReturn(3.38%)
John Hancock Investment Grade Bond Fund | Prospectus Class I Shares | before tax | Class I
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass I
Labelrr_AverageAnnualReturnLabelbefore tax
1 Yearrr_AverageAnnualReturnYear0110.50%
5 Yearrr_AverageAnnualReturnYear056.50%
10 Yearrr_AverageAnnualReturnYear106.14%
John Hancock Investment Grade Bond Fund | Prospectus Class I Shares | After tax on distributions | Class I
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass I
Labelrr_AverageAnnualReturnLabelAfter tax on distributions
1 Yearrr_AverageAnnualReturnYear018.59%
5 Yearrr_AverageAnnualReturnYear054.50%
10 Yearrr_AverageAnnualReturnYear104.18%
John Hancock Investment Grade Bond Fund | Prospectus Class I Shares | After tax on distributions, with sale | Class I
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Columnrr_AverageAnnualReturnColumnNameClass I
Labelrr_AverageAnnualReturnLabelAfter tax on distributions, with sale
1 Yearrr_AverageAnnualReturnYear016.78%
5 Yearrr_AverageAnnualReturnYear054.36%
10 Yearrr_AverageAnnualReturnYear104.07%
John Hancock Investment Grade Bond Fund | Prospectus Class I Shares | Barclays Capital U.S. Aggregate Bond Index
 
Average Annual Total Returnsrr_AverageAnnualReturnAbstract 
Labelrr_AverageAnnualReturnLabelBarclays Capital U.S. Aggregate Bond Index
1 Yearrr_AverageAnnualReturnYear016.54%
5 Yearrr_AverageAnnualReturnYear055.80%
10 Yearrr_AverageAnnualReturnYear105.84%
[1](on certain purchases, including those of $1 million or more)
[2]"Other expenses" have been restated to reflect current transfer agency and service fees.
[3]The adviser has contractually agreed to limit the maximum rate of management fee to 0.55% of the fund's average daily net assets. The current expense limitation agreement expires on September 30, 2012, unless renewed by mutual agreement of the fund and the adviser based upon a determination that this is appropriate under the circumstances at that time.
[4]"Other expenses" have been estimated for the first year of operations of the fund's Class R6 shares.
[5]The adviser has contractually agreed to waive all or a portion of its management fee and reimburse or pay operating expenses of the fund to the extent necessary to maintain the fund's total operating expenses at 0.98%, 1.73% and 1.73% for Class A, Class B and Class C shares, respectively, excluding certain expenses such as taxes, brokerage commissions, interest, litigation and extraordinary expenses, acquired fund fee expenses paid indirectly and short dividend expense. The current expense limitation agreement expires on September 30, 2012, unless renewed by mutual agreement of the fund and the adviser based upon a determination that this is appropriate under the circumstances at the time.