Label

Element

Value

Prospectus:

rr_ProspectusTable

Supplement Text Block

jhdvif-20200212_SupplementTextBlock

Prospectus Supplement

John Hancock Investment Trust

John Hancock Disciplined Value International Fund (the fund)

Supplement dated February 12, 2020 to the current Class A, Class C, Class I, Class R2, Class R4, and Class R6 shares Prospectus, as may be supplemented (the Prospectus)

The "Annual fund operating expenses" table and the "Expense example" table in the "Fund summary" section are amended and restated as follows to reflect the fund's management fee schedule effective February 12, 2020:

Annual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)	A	C	I	R2	R4	R6
Management fee1	0.78	0.78	0.78	0.78	0.78	0.78
Distribution and service (Rule 12b-1) fees	0.252	1.00	0.00	0.25	0.25	0.00
Other expenses
Service plan fee	0.00	0.00	0.00	0.253	0.10	0.00
Additional other expenses	0.20	0.20	0.204	0.09	0.09	0.09
Total other expenses	0.20	0.20	0.20	0.34	0.19	0.09
Total annual fund operating expenses	1.23	1.98	0.98	1.37	1.22	0.87
Contractual expense reimbursement5	-0.01	-0.01	-0.01	-0.01	-0.116	-0.01
Total annual fund operating expenses after expense reimbursements	1.22	1.97	0.97	1.36	1.11	0.86

1	"Management fee" has been restated to reflect the contractual management fee schedule effective February 12, 2020.
2	"Distribution and service (Rule 12b-1) fees" have been restated to reflect the Rule 12b-1 plan fee schedule effective July 1, 2019.
3	"Service plan fee" has been restated to reflect maximum allowable fees.
4	"Other expenses" have been restated from fiscal year amounts to reflect current fees and expenses.
5	The advisor contractually agrees to waive a portion of its management fee and/or reimburse expenses for the fund and certain other John Hancock funds according to an asset level breakpoint schedule that is based on the aggregate net assets of all the funds participating in the waiver or reimbursement. This waiver is allocated proportionally among the participating funds. During its most recent fiscal year, the fund's reimbursement amounted to 0.01% of the fund's average daily net assets. This agreement expires on July 31, 2021, unless renewed by mutual agreement of the fund and the advisor based upon a determination that this is appropriate under the circumstances at that time.
6	The distributor contractually agrees to limit its Rule 12b-1 fees for Class R4 shares to 0.15%. This agreement expires on February 28, 2021, unless renewed by mutual agreement of the fund and the distributor 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, except as shown below, 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 ($)	A	C		I	R2	R4	R6
Shares		Sold	Not Sold
1 year	618	300	200	99	138	113	88
3 years	870	620	620	311	433	376	277
5 years	1,141	1,067	1,067	541	749	660	481
10 years	1,913	2,305	2,305	1,200	1,645	1,468	1,072

Prospectus Supplement

John Hancock Investment Trust

John Hancock Disciplined Value International Fund (the fund)

Supplement dated February 12, 2020 to the current Class R5 shares Prospectus, as may be supplemented (the Prospectus)

The "Annual fund operating expenses" table and the "Expense example" table in the "Fund summary" section are amended and restated as follows to reflect the fund's management fee schedule effective February 12, 2020:

Annual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)	R5
Management fee1	0.78
Other expenses
Service plan fee	0.05
Additional other expenses2	0.09
Total other expenses	0.14
Total annual fund operating expenses	0.92
Contractual expense reimbursement3	-0.01
Total annual fund operating expenses after expense reimbursements	0.91

1	"Management fee" has been restated to reflect the contractual management fee schedule effective February 12, 2020.
2	"Other expenses," such as expected transfer agency expenses, have been estimated for the first year of operations of the fund's Class R5 shares.
3	The advisor contractually agrees to waive a portion of its management fee and/or reimburse expenses for the fund and certain other John Hancock funds according to an asset level breakpoint schedule that is based on the aggregate net assets of all the funds participating in the waiver or reimbursement. This waiver is allocated proportionally among the participating funds. During its most recent fiscal year, the fund's reimbursement amounted to 0.01% of the fund's average daily net assets. This agreement expires on July 31, 2021, unless renewed by mutual agreement of the fund and the advisor based upon a determination that this is appropriate under the circumstances at that time.

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 ($)	R5
1 year	93
3 years	292
5 years	508
10 years	1,130

Prospectus Supplement

John Hancock Investment Trust

John Hancock Disciplined Value International Fund (the fund)

Supplement dated February 12, 2020 to the current John Hancock Equity and Alternative/Specialty Funds Class NAV shares Prospectus, as may be supplemented (the Prospectus)

The "Annual fund operating expenses" table and the "Expense example" table in the "Fund summary" section are amended and restated as follows to reflect the fund's management fee schedule effective February 12, 2020:

Annual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)	NAV
Management fee1	0.78
Other expenses	0.08
Total annual fund operating expenses	0.86
Contractual expense reimbursement2	-0.01
Total annual fund operating expenses after expense reimbursements	0.85

1

"Management fee" has been restated to reflect the contractual management fee schedule effective February 12, 2020.

2

The advisor contractually agrees to waive a portion of its management fee and/or reimburse expenses for the fund and certain other John Hancock funds according to an asset level breakpoint schedule that is based on the aggregate net assets of all the funds participating in the waiver or reimbursement. This waiver is allocated proportionally among the participating funds. During its most recent fiscal year, the fund's reimbursement amounted to 0.01% of the fund's average daily net assets. This agreement expires on July 31, 2021, unless renewed by mutual agreement of the fund and the advisor based upon a determination that this is appropriate under the circumstances at that time.

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 ($)	NAV
1 year	87
3 years	273
5 years	476
10 years	1,060

(John Hancock Disciplined Value International Fund - Classes A, C, I, R2, R4 and R6) | (John Hancock Disciplined Value International 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

July 31, 2021

Expenses Restated to Reflect Current [Text]

rr_ExpensesRestatedToReflectCurrent

"Other expenses" have been restated from fiscal year amounts to reflect current fees and expenses.

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, except as shown below, 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:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sold

Expense Example, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

Not Sold

(John Hancock Disciplined Value International Fund - Classes A, C, I, R2, R4 and R6) | (John Hancock Disciplined Value International Fund) | Class A

Prospectus:

rr_ProspectusTable

Management fee

rr_ManagementFeesOverAssets

0.78%

^[1]

Distribution and service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

^[2]

Service plan fee

rr_Component1OtherExpensesOverAssets

none

Additional other expenses

rr_Component2OtherExpensesOverAssets

0.20%

Other Expenses Over Assets

rr_OtherExpensesOverAssets

0.20%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.23%

Contractual expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[3]

Total annual fund operating expenses after expense reimbursements

rr_NetExpensesOverAssets

1.22%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 618

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

870

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,141

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,913

(John Hancock Disciplined Value International Fund - Classes A, C, I, R2, R4 and R6) | (John Hancock Disciplined Value International Fund) | Class C

Prospectus:

rr_ProspectusTable

Management fee

rr_ManagementFeesOverAssets

0.78%

^[1]

Distribution and service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Service plan fee

rr_Component1OtherExpensesOverAssets

none

Additional other expenses

rr_Component2OtherExpensesOverAssets

0.20%

Other Expenses Over Assets

rr_OtherExpensesOverAssets

0.20%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.98%

Contractual expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[3]

Total annual fund operating expenses after expense reimbursements

rr_NetExpensesOverAssets

1.97%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 300

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

620

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,067

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,305

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

200

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

620

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,067

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,305

(John Hancock Disciplined Value International Fund - Classes A, C, I, R2, R4 and R6) | (John Hancock Disciplined Value International Fund) | Class I

Prospectus:

rr_ProspectusTable

Management fee

rr_ManagementFeesOverAssets

0.78%

^[1]

Distribution and service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Service plan fee

rr_Component1OtherExpensesOverAssets

none

Additional other expenses

rr_Component2OtherExpensesOverAssets

0.20%

^[4]

Other Expenses Over Assets

rr_OtherExpensesOverAssets

0.20%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.98%

Contractual expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[3]

Total annual fund operating expenses after expense reimbursements

rr_NetExpensesOverAssets

0.97%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 99

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

311

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

541

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,200

(John Hancock Disciplined Value International Fund - Classes A, C, I, R2, R4 and R6) | (John Hancock Disciplined Value International Fund) | Class R2

Prospectus:

rr_ProspectusTable

Management fee

rr_ManagementFeesOverAssets

0.78%

^[1]

Distribution and service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Service plan fee

rr_Component1OtherExpensesOverAssets

0.25%

^[5]

Additional other expenses

rr_Component2OtherExpensesOverAssets

0.09%

Other Expenses Over Assets

rr_OtherExpensesOverAssets

0.34%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.37%

Contractual expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[3]

Total annual fund operating expenses after expense reimbursements

rr_NetExpensesOverAssets

1.36%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 138

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

433

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

749

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,645

(John Hancock Disciplined Value International Fund - Classes A, C, I, R2, R4 and R6) | (John Hancock Disciplined Value International Fund) | Class R4

Prospectus:

rr_ProspectusTable

Management fee

rr_ManagementFeesOverAssets

0.78%

^[1]

Distribution and service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Service plan fee

rr_Component1OtherExpensesOverAssets

0.10%

Additional other expenses

rr_Component2OtherExpensesOverAssets

0.09%

Other Expenses Over Assets

rr_OtherExpensesOverAssets

0.19%

Total annual fund operating expenses

rr_ExpensesOverAssets

1.22%

Contractual expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.11%)

^[3],[6]

Total annual fund operating expenses after expense reimbursements

rr_NetExpensesOverAssets

1.11%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 113

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

376

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

660

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,468

(John Hancock Disciplined Value International Fund - Classes A, C, I, R2, R4 and R6) | (John Hancock Disciplined Value International Fund) | Class R6

Prospectus:

rr_ProspectusTable

Management fee

rr_ManagementFeesOverAssets

0.78%

^[1]

Distribution and service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Service plan fee

rr_Component1OtherExpensesOverAssets

none

Additional other expenses

rr_Component2OtherExpensesOverAssets

0.09%

Other Expenses Over Assets

rr_OtherExpensesOverAssets

0.09%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.87%

Contractual expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[3]

Total annual fund operating expenses after expense reimbursements

rr_NetExpensesOverAssets

0.86%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 88

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

277

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

481

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,072

(John Hancock Disciplined Value International Fund - Class R5) | (John Hancock Disciplined Value International 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

July 31, 2021

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 R5 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 Disciplined Value International Fund - Class R5) | (John Hancock Disciplined Value International Fund) | Class R5

Prospectus:

rr_ProspectusTable

Management fee

rr_ManagementFeesOverAssets

0.78%

^[1]

Service plan fee

rr_Component1OtherExpensesOverAssets

0.05%

Additional other expenses

rr_Component2OtherExpensesOverAssets

0.09%

^[7]

Other Expenses Over Assets

rr_OtherExpensesOverAssets

0.14%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.92%

Contractual expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[3]

Total annual fund operating expenses after expense reimbursements

rr_NetExpensesOverAssets

0.91%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 93

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

292

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

508

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,130

(John Hancock Disciplined Value International Fund - Class NAV) | (John Hancock Disciplined Value International 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

July 31, 2021

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 Disciplined Value International Fund - Class NAV) | (John Hancock Disciplined Value International Fund) | Class NAV

Prospectus:

rr_ProspectusTable

Management fee

rr_ManagementFeesOverAssets

0.78%

^[1]

Other Expenses Over Assets

rr_OtherExpensesOverAssets

0.08%

Total annual fund operating expenses

rr_ExpensesOverAssets

0.86%

Contractual expense reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[3]

Total annual fund operating expenses after expense reimbursements

rr_NetExpensesOverAssets

0.85%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 87

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

273

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

476

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,060

[1] "Management fee" has been restated to reflect the contractual management fee schedule effective February 12, 2020.

[2] "Distribution and service (Rule 12b-1) fees" have been restated to reflect the Rule 12b-1 plan fee schedule effective July 1, 2019.

[3] The advisor contractually agrees to waive a portion of its management fee and/or reimburse expenses for the fund and certain other John Hancock funds according to an asset level breakpoint schedule that is based on the aggregate net assets of all the funds participating in the waiver or reimbursement. This waiver is allocated proportionally among the participating funds. During its most recent fiscal year, the fund's reimbursement amounted to 0.01% of the fund's average daily net assets. This agreement expires on July 31, 2021, unless renewed by mutual agreement of the fund and the advisor based upon a determination that this is appropriate under the circumstances at that time.

[4] "Other expenses" have been restated from fiscal year amounts to reflect current fees and expenses.

[5] "Service plan fee" has been restated to reflect maximum allowable fees.

[6] The distributor contractually agrees to limit its Rule 12b-1 fees for Class R4 shares to 0.15%. This agreement expires on February 28, 2021, unless renewed by mutual agreement of the fund and the distributor based upon a determination that this is appropriate under the circumstances at that time.

[7] "Other expenses," such as expected transfer agency expenses, have been estimated for the first year of operations of the fund's Class R5 shares.