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Prospectus: rr_ProspectusTable  
Supplement Text Block jhbndtrst-20160701_SupplementTextBlock
 
John Hancock Bond Trust
Supplement dated July 1, 2016 to the current John Hancock Bond Trust Class NAV Shares Prospectus
 
John Hancock Investment Grade Bond Fund (the fund)
 
Effective July 1, 2016, the Annual fund operating expenses table and the Expense example table in the "Fund summary" section applicable to the fund is revised and restated as follows:
 
Annual fund operating expenses (%)
(expenses that you pay each year as a percentage of the value of your investment)
NAV
Management fee
0.40
Other expenses1
0.10
Total annual fund operating expenses
0.50
Contractual expense reimbursement2
-0.08
Total annual fund operating expenses after expense reimbursements
0.42
 
 
1
"Other expenses" have been estimated for the first year of operations of the fund's Class NAV shares.
 
 
2
The advisor contractually agrees to reduce its management fee or, if necessary, make payment to the fund in an amount equal to the amount by which expenses of the fund exceed 0.42% of average annual net assets (on an annualized basis) of the fund. For purposes of this agreement, "expenses of the fund" means all fund expenses, excluding (a) taxes, (b) brokerage commissions, (c) interest expense, (d) litigation and indemnification expenses and other extraordinary expenses not incurred in the ordinary course of the fund's business, (e) class-specific expenses, (f) acquired fund fees and expenses paid indirectly, (g) borrowing costs, (h) prime brokerage fees, and (i) short dividend expense. This agreement expires on September 30, 2017, unless renewed by mutual agreement of the advisor and the fund based upon a determination that this is appropriate under the circumstances at that time.
 
Expense example
 
This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. Please see below a hypothetical example showing the expenses of a $10,000 investment for the time periods indicated and then assuming you sell of all of your shares at the end of those periods. The example assumes a 5% average annual return and that fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
 
Expenses ($)
NAV
1 year
43
3 years
152
5 years
272
10 years
621
 
(John Hancock Investment Grade Bond Fund - Class NAV) | (John Hancock Investment Grade Bond Fund)  
Prospectus: rr_ProspectusTable  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Annual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination September 30, 2017
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates "Other expenses" have been estimated for the first year of operations of the fund's Class NAV shares.
Expense Example [Heading] rr_ExpenseExampleHeading

Expense example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. Please see below a hypothetical example showing the expenses of a $10,000 investment for the time periods indicated and then assuming you sell of all of your shares at the end of those periods. The example assumes a 5% average annual return and that fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

(John Hancock Investment Grade Bond Fund - Class NAV) | (John Hancock Investment Grade Bond Fund) | Class NAV  
Prospectus: rr_ProspectusTable  
Management fee rr_ManagementFeesOverAssets 0.40%
Other expenses rr_OtherExpensesOverAssets 0.10% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.50%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [2]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.42%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 43
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 152
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 272
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 621
[1] "Other expenses" have been estimated for the first year of operations of the fund's Class NAV shares.
[2] The advisor contractually agrees to reduce its management fee or, if necessary, make payment to the fund in an amount equal to the amount by which expenses of the fund exceed 0.42% of average annual net assets (on an annualized basis) of the fund. For purposes of this agreement, "expenses of the fund" means all fund expenses, excluding (a) taxes, (b) brokerage commissions, (c) interest expense, (d) litigation and indemnification expenses and other extraordinary expenses not incurred in the ordinary course of the fund's business, (e) class-specific expenses, (f) acquired fund fees and expenses paid indirectly, (g) borrowing costs, (h) prime brokerage fees, and (i) short dividend expense. This agreement expires on September 30, 2017, unless renewed by mutual agreement of the advisor and the fund based upon a determination that this is appropriate under the circumstances at that time.