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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate May 31, 2011
Registrant Name dei_EntityRegistrantName JOHN HANCOCK BOND TRUST
Central Index Key dei_EntityCentralIndexKey 0000315554
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Feb. 13, 2012
Document Effective Date dei_DocumentEffectiveDate Feb. 13, 2012
Prospectus Date rr_ProspectusDate Oct. 01, 2011
Supplement [Text Block] jhbt315554_SupplementTextBlock
JOHN HANCOCK BOND TRUST
John Hancock Government Income Fund (the fund)
Supplement dated 2—13—12 to the current Class A, Class B and Class C shares Prospectus
In the “Fund summary” section, the information under the headings “Fees and expenses” and “Expense example” is amended and restated as follows:
John Hancock Government Income Fund | Prospectus Class A, B and C Shares
  
Fees and expenses jhbt315554_FundFeesAndExpensesAbstract  
Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $100,000 in the John Hancock family of funds. More information about these and other discounts is available on pages 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 Discounts jhbt315554_ExpenseBreakpointDiscountsAbstract  
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $100,000 in the John Hancock family of funds. More information about these and other discounts is available on pages 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 fees rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (%) (fees paid directly from your investment)
Annual fund operating expenses rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)
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 Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination September 30, 2013
Expense example rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading Expense example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. Please see below a hypothetical example showing the expenses of a $10,000 investment in the fund for the time periods indicated (Kept column) and then assuming a redemption of all of your shares at the end of those periods (Sold column). The example assumes a 5% average annual return. The example assumes fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example by Year [Heading] rr_ExpenseExampleByYearHeading Expenses ($)
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Sold
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Kept
John Hancock Government Income Fund | Prospectus Class A, B and C Shares | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol JHGIX
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder Fees Column [Text] rr_ShareholderFeesColumnName Class A
Maximum front-end sales charge (load) on purchases as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther 4.50%
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther 1.00% [1]
Annual fund operating expenses rr_OperatingExpensesAbstract  
Operating Expenses Column [Text] rr_OperatingExpensesColumnName Class A
Management fee rr_ManagementFeesOverAssets 0.60%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.28% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.13%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.15%) [3],[4]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.98%
Expense example rr_ExpenseExampleAbstract  
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName Class A
1 Year rr_ExpenseExampleYear01 545
3 Years rr_ExpenseExampleYear03 779
5 Years rr_ExpenseExampleYear05 1,030
10 Years rr_ExpenseExampleYear10 1,750
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName Class A
1 Year rr_ExpenseExampleNoRedemptionYear01 545
3 Years rr_ExpenseExampleNoRedemptionYear03 779
5 Years rr_ExpenseExampleNoRedemptionYear05 1,030
10 Years rr_ExpenseExampleNoRedemptionYear10 1,750
John Hancock Government Income Fund | Prospectus Class A, B and C Shares | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol TSGIX
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder Fees Column [Text] rr_ShareholderFeesColumnName Class B
Maximum front-end sales charge (load) on purchases as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther   
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther 5.00%
Annual fund operating expenses rr_OperatingExpensesAbstract  
Operating Expenses Column [Text] rr_OperatingExpensesColumnName Class B
Management fee rr_ManagementFeesOverAssets 0.60%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.28% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.88%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [4]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 1.81%
Expense example rr_ExpenseExampleAbstract  
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName Class B
1 Year rr_ExpenseExampleYear01 684
3 Years rr_ExpenseExampleYear03 884
5 Years rr_ExpenseExampleYear05 1,210
10 Years rr_ExpenseExampleYear10 2,000
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName Class B
1 Year rr_ExpenseExampleNoRedemptionYear01 184
3 Years rr_ExpenseExampleNoRedemptionYear03 584
5 Years rr_ExpenseExampleNoRedemptionYear05 1,010
10 Years rr_ExpenseExampleNoRedemptionYear10 2,000
John Hancock Government Income Fund | Prospectus Class A, B and C Shares | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol TCGIX
Shareholder fees rr_ShareholderFeesAbstract  
Shareholder Fees Column [Text] rr_ShareholderFeesColumnName Class C
Maximum front-end sales charge (load) on purchases as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther   
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther 1.00%
Annual fund operating expenses rr_OperatingExpensesAbstract  
Operating Expenses Column [Text] rr_OperatingExpensesColumnName Class C
Management fee rr_ManagementFeesOverAssets 0.60%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.28% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.88%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [4]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 1.81%
Expense example rr_ExpenseExampleAbstract  
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName Class C
1 Year rr_ExpenseExampleYear01 284
3 Years rr_ExpenseExampleYear03 584
5 Years rr_ExpenseExampleYear05 1,010
10 Years rr_ExpenseExampleYear10 2,195
Expense Example, No Redemption rr_ExpenseExampleNoRedemptionAbstract  
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName Class C
1 Year rr_ExpenseExampleNoRedemptionYear01 184
3 Years rr_ExpenseExampleNoRedemptionYear03 584
5 Years rr_ExpenseExampleNoRedemptionYear05 1,010
10 Years rr_ExpenseExampleNoRedemptionYear10 2,195
[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 waive all or a portion of its management fee and/or reimburse or pay operating expenses of the fund to the extent necessary to maintain the fund's total operating expenses at 0.98% for Class A shares, excluding certain expenses such as taxes, brokerage commissions, interest expense, litigation and indemnification expenses and other extraordinary expenses, acquired fund fees and expenses paid indirectly and short dividend expense. The current expense limitation agreement expires on September 30, 2013, 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.
[4] The adviser has contractually agreed to limit the maximum rate of management fee to 0.53% of the fund's average daily net assets. The current expense limitation agreement expires on September 30, 2013, 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.