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Label Element Value
Prospectus: rr_ProspectusTable  
Supplement Text Block jhitsmlcpcrfnd-20171002_SupplementTextBlock
 
John Hancock Investment Trust
 
Supplement dated October 1, 2017, to the current Class R6 Prospectus (the "Prospectus")
 
John Hancock Small Cap Core Fund (the fund)
 
Effective October 1, 2017, the Annual fund operating expenses table and the Expense example table in the "Fund summary" section are revised and restated as follows:
 
Annual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)
R6
Management fee 1
0.87
Other expenses2
0.14
Acquired fund fees and expenses3
0.00
Total annual fund operating expenses
1.01
   1  "Management fee" has been restated to reflect the contractual management fee schedule effective October 1, 2017.
   2  "Other expenses," such as expected transfer agency expenses, have been estimated for the first year of operations of the fund's Class R6 shares.
   3  "Acquired fund fees and expenses" for the fund have been restated to reflect an amendment to the fund's "Non-Fundamental Investment Restrictions" effective October 1, 2017 to prohibit the fund from investing in business development companies ("BDCs"). In meeting its investment restrictions, the fund does not currently incur any acquired fund fees or expenses.
 
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 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 ($)
R6
1 year
103
3 years
322
5 years
558
10 years
1,236
 
(John Hancock Small Cap Core Fund - Class R6) | (John Hancock Small Cap Core 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)
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates "Other expenses," such as expected transfer agency expenses, have been estimated for the first year of operations of the fund's Class R6 shares.
Expense Example [Heading] rr_ExpenseExampleHeading

Expense example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. Please see below a hypothetical example showing the expenses of a $10,000 investment for the time periods indicated and then assuming you sell all of your shares at the end of those periods. The example assumes a 5% average annual return and that fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
(John Hancock Small Cap Core Fund - Class R6) | (John Hancock Small Cap Core Fund) | Class R6  
Prospectus: rr_ProspectusTable  
Management fee rr_ManagementFeesOverAssets 0.87% [1]
Other expenses rr_OtherExpensesOverAssets 0.14% [2]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets none [3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.01%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 103
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 322
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 558
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,236
[1] "Management fee" has been restated to reflect the contractual management fee schedule effective October 1, 2017.
[2] "Other expenses," such as expected transfer agency expenses, have been estimated for the first year of operations of the fund's Class R6 shares.
[3] "Acquired fund fees and expenses" for the fund have been restated to reflect an amendment to the fund's "Non-Fundamental Investment Restrictions" effective October 1, 2017 to prohibit the fund from investing in business development companies ("BDCs"). In meeting its investment restrictions, the fund does not currently incur any acquired fund fees or expenses.