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Shareholder Report
 6 Months Ended
Sep. 30, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name JOHN HANCOCK INVESTMENT TRUST
Entity Central Index Key 0000022370
Entity Investment Company Type N-1A
Document Period End Date Sep. 30, 2024
C000198632 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Diversified Real Assets Fund
Class Name Class NAV
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This semiannual shareholder report contains important information about the John Hancock Diversified Real Assets Fund (the fund) for the period of April 1, 2024 to September 30, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can request this information by contacting us at 800-344-1029.
Additional Information Phone Number 800-344-1029
Expenses [Text Block]
What were the fund costs during the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Diversified Real Assets Fund
(Class NAV)		 $45 0.87%
Expenses Paid, Amount $ 45
Expense Ratio, Percent 0.87%
Net Assets $ 998,255,806
Holdings Count | Holding 285
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $998,255,806
Total number of portfolio holdings 285
Portfolio turnover rate 18%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing percentage of the total net assets of the fund.
Top Ten Holdings
Exxon Mobil Corp. 3.1%
Shell PLC 2.4%
Equinix, Inc. 2.4%
Prologis, Inc. 2.4%
Welltower, Inc. 2.1%
Chevron Corp. 2.0%
Canadian Natural Resources, Ltd. 1.9%
AvalonBay Communities, Inc. 1.6%
Freeport-McMoRan, Inc. 1.6%
TotalEnergies SE 1.5%
Sector Composition
Real estate 35.3%
Energy 32.8%
Materials 18.1%
Utilities 6.2%
Industrials 2.0%
Consumer discretionary 2.0%
Information technology 1.1%
Communication services 0.8%
Health care 0.3%
Financials 0.3%
Short-term investments and other 1.1%
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Largest Holdings [Text Block]
Top Ten Holdings
Exxon Mobil Corp. 3.1%
Shell PLC 2.4%
Equinix, Inc. 2.4%
Prologis, Inc. 2.4%
Welltower, Inc. 2.1%
Chevron Corp. 2.0%
Canadian Natural Resources, Ltd. 1.9%
AvalonBay Communities, Inc. 1.6%
Freeport-McMoRan, Inc. 1.6%
TotalEnergies SE 1.5%
C000227916 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Mid Cap Growth Fund
Class Name Class A
Trading Symbol JACJX
Annual or Semi-Annual Statement [Text Block] This semiannual shareholder report contains important information about the John Hancock Mid Cap Growth Fund (the fund) for the period of April 1, 2024 to September 30, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at jhinvestments.com/documents. You can also request this information by contacting us at 800-225-5291.
Additional Information Phone Number 800-225-5291
Additional Information Website jhinvestments.com/documents
Expenses [Text Block]
What were the fund costs during the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Mid Cap Growth Fund
(Class A/JACJX)		 $59 1.17%
Expenses Paid, Amount $ 59
Expense Ratio, Percent 1.17%
Net Assets $ 1,409,010,507
Holdings Count | Holding 64
Investment Company Portfolio Turnover 82.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $1,409,010,507
Total number of portfolio holdings 64
Portfolio turnover rate 82%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing percentage of the total net assets of the fund.
Top Ten Holdings
Axon Enterprise, Inc. 3.8%
Spotify Technology SA 3.3%
Tradeweb Markets, Inc., Class A 3.1%
Flex, Ltd. 3.0%
DraftKings, Inc., Class A 3.0%
Live Nation Entertainment, Inc. 3.0%
Liberty Media Corp.-Liberty Formula One, Series C 2.9%
Pinterest, Inc., Class A 2.9%
Monolithic Power Systems, Inc. 2.8%
On Holding AG, Class A 2.8%
Sector Composition
Information technology 21.0%
Health care 16.8%
Communication services 16.2%
Consumer discretionary 12.5%
Industrials 11.9%
Financials 11.6%
Energy 4.5%
Consumer staples 2.2%
Real estate 1.1%
Utilities 1.0%
Short-term investments and other 1.2%
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Largest Holdings [Text Block]
Top Ten Holdings
Axon Enterprise, Inc. 3.8%
Spotify Technology SA 3.3%
Tradeweb Markets, Inc., Class A 3.1%
Flex, Ltd. 3.0%
DraftKings, Inc., Class A 3.0%
Live Nation Entertainment, Inc. 3.0%
Liberty Media Corp.-Liberty Formula One, Series C 2.9%
Pinterest, Inc., Class A 2.9%
Monolithic Power Systems, Inc. 2.8%
On Holding AG, Class A 2.8%
C000227917 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Mid Cap Growth Fund
Class Name Class C
Trading Symbol JACLX
Annual or Semi-Annual Statement [Text Block] This semiannual shareholder report contains important information about the John Hancock Mid Cap Growth Fund (the fund) for the period of April 1, 2024 to September 30, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at jhinvestments.com/documents. You can also request this information by contacting us at 800-225-5291.
Additional Information Phone Number 800-225-5291
Additional Information Website jhinvestments.com/documents
Expenses [Text Block]
What were the fund costs during the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Mid Cap Growth Fund
(Class C/JACLX)		 $97 1.92%
Expenses Paid, Amount $ 97
Expense Ratio, Percent 1.92%
Net Assets $ 1,409,010,507
Holdings Count | Holding 64
Investment Company Portfolio Turnover 82.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $1,409,010,507
Total number of portfolio holdings 64
Portfolio turnover rate 82%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing percentage of the total net assets of the fund.
Top Ten Holdings
Axon Enterprise, Inc. 3.8%
Spotify Technology SA 3.3%
Tradeweb Markets, Inc., Class A 3.1%
Flex, Ltd. 3.0%
DraftKings, Inc., Class A 3.0%
Live Nation Entertainment, Inc. 3.0%
Liberty Media Corp.-Liberty Formula One, Series C 2.9%
Pinterest, Inc., Class A 2.9%
Monolithic Power Systems, Inc. 2.8%
On Holding AG, Class A 2.8%
Sector Composition
Information technology 21.0%
Health care 16.8%
Communication services 16.2%
Consumer discretionary 12.5%
Industrials 11.9%
Financials 11.6%
Energy 4.5%
Consumer staples 2.2%
Real estate 1.1%
Utilities 1.0%
Short-term investments and other 1.2%
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Largest Holdings [Text Block]
Top Ten Holdings
Axon Enterprise, Inc. 3.8%
Spotify Technology SA 3.3%
Tradeweb Markets, Inc., Class A 3.1%
Flex, Ltd. 3.0%
DraftKings, Inc., Class A 3.0%
Live Nation Entertainment, Inc. 3.0%
Liberty Media Corp.-Liberty Formula One, Series C 2.9%
Pinterest, Inc., Class A 2.9%
Monolithic Power Systems, Inc. 2.8%
On Holding AG, Class A 2.8%
C000227914 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Mid Cap Growth Fund
Class Name Class I
Trading Symbol JACBX
Annual or Semi-Annual Statement [Text Block] This semiannual shareholder report contains important information about the John Hancock Mid Cap Growth Fund (the fund) for the period of April 1, 2024 to September 30, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at jhinvestments.com/documents. You can also request this information by contacting us at 800-225-5291.
Additional Information Phone Number 800-225-5291
Additional Information Website jhinvestments.com/documents
Expenses [Text Block]
What were the fund costs during the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Mid Cap Growth Fund
(Class I/JACBX)		 $46 0.92%
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.92%
Net Assets $ 1,409,010,507
Holdings Count | Holding 64
Investment Company Portfolio Turnover 82.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $1,409,010,507
Total number of portfolio holdings 64
Portfolio turnover rate 82%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing percentage of the total net assets of the fund.
Top Ten Holdings
Axon Enterprise, Inc. 3.8%
Spotify Technology SA 3.3%
Tradeweb Markets, Inc., Class A 3.1%
Flex, Ltd. 3.0%
DraftKings, Inc., Class A 3.0%
Live Nation Entertainment, Inc. 3.0%
Liberty Media Corp.-Liberty Formula One, Series C 2.9%
Pinterest, Inc., Class A 2.9%
Monolithic Power Systems, Inc. 2.8%
On Holding AG, Class A 2.8%
Sector Composition
Information technology 21.0%
Health care 16.8%
Communication services 16.2%
Consumer discretionary 12.5%
Industrials 11.9%
Financials 11.6%
Energy 4.5%
Consumer staples 2.2%
Real estate 1.1%
Utilities 1.0%
Short-term investments and other 1.2%
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Largest Holdings [Text Block]
Top Ten Holdings
Axon Enterprise, Inc. 3.8%
Spotify Technology SA 3.3%
Tradeweb Markets, Inc., Class A 3.1%
Flex, Ltd. 3.0%
DraftKings, Inc., Class A 3.0%
Live Nation Entertainment, Inc. 3.0%
Liberty Media Corp.-Liberty Formula One, Series C 2.9%
Pinterest, Inc., Class A 2.9%
Monolithic Power Systems, Inc. 2.8%
On Holding AG, Class A 2.8%
C000227913 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Mid Cap Growth Fund
Class Name Class NAV
Trading Symbol JACFX
Annual or Semi-Annual Statement [Text Block] This semiannual shareholder report contains important information about the John Hancock Mid Cap Growth Fund (the fund) for the period of April 1, 2024 to September 30, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at jhinvestments.com/underlying-funds. You can also request this information by contacting us at 800-344-1029.
Additional Information Phone Number 800-344-1029
Additional Information Website jhinvestments.com/underlying-funds
Expenses [Text Block]
What were the fund costs during the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Mid Cap Growth Fund
(Class NAV/JACFX)		 $41 0.81%
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.81%
Net Assets $ 1,409,010,507
Holdings Count | Holding 64
Investment Company Portfolio Turnover 82.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $1,409,010,507
Total number of portfolio holdings 64
Portfolio turnover rate 82%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing percentage of the total net assets of the fund.
Top Ten Holdings
Axon Enterprise, Inc. 3.8%
Spotify Technology SA 3.3%
Tradeweb Markets, Inc., Class A 3.1%
Flex, Ltd. 3.0%
DraftKings, Inc., Class A 3.0%
Live Nation Entertainment, Inc. 3.0%
Liberty Media Corp.-Liberty Formula One, Series C 2.9%
Pinterest, Inc., Class A 2.9%
Monolithic Power Systems, Inc. 2.8%
On Holding AG, Class A 2.8%
Sector Composition
Information technology 21.0%
Health care 16.8%
Communication services 16.2%
Consumer discretionary 12.5%
Industrials 11.9%
Financials 11.6%
Energy 4.5%
Consumer staples 2.2%
Real estate 1.1%
Utilities 1.0%
Short-term investments and other 1.2%
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Largest Holdings [Text Block]
Top Ten Holdings
Axon Enterprise, Inc. 3.8%
Spotify Technology SA 3.3%
Tradeweb Markets, Inc., Class A 3.1%
Flex, Ltd. 3.0%
DraftKings, Inc., Class A 3.0%
Live Nation Entertainment, Inc. 3.0%
Liberty Media Corp.-Liberty Formula One, Series C 2.9%
Pinterest, Inc., Class A 2.9%
Monolithic Power Systems, Inc. 2.8%
On Holding AG, Class A 2.8%
C000227915 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Mid Cap Growth Fund
Class Name Class R6
Trading Symbol JACEX
Annual or Semi-Annual Statement [Text Block] This semiannual shareholder report contains important information about the John Hancock Mid Cap Growth Fund (the fund) for the period of April 1, 2024 to September 30, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at jhinvestments.com/documents. You can also request this information by contacting us at 800-225-5291.
Additional Information Phone Number 800-225-5291
Additional Information Website jhinvestments.com/documents
Expenses [Text Block]
What were the fund costs during the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Mid Cap Growth Fund
(Class R6/JACEX)		 $41 0.81%
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.81%
Net Assets $ 1,409,010,507
Holdings Count | Holding 64
Investment Company Portfolio Turnover 82.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $1,409,010,507
Total number of portfolio holdings 64
Portfolio turnover rate 82%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing percentage of the total net assets of the fund.
Top Ten Holdings
Axon Enterprise, Inc. 3.8%
Spotify Technology SA 3.3%
Tradeweb Markets, Inc., Class A 3.1%
Flex, Ltd. 3.0%
DraftKings, Inc., Class A 3.0%
Live Nation Entertainment, Inc. 3.0%
Liberty Media Corp.-Liberty Formula One, Series C 2.9%
Pinterest, Inc., Class A 2.9%
Monolithic Power Systems, Inc. 2.8%
On Holding AG, Class A 2.8%
Sector Composition
Information technology 21.0%
Health care 16.8%
Communication services 16.2%
Consumer discretionary 12.5%
Industrials 11.9%
Financials 11.6%
Energy 4.5%
Consumer staples 2.2%
Real estate 1.1%
Utilities 1.0%
Short-term investments and other 1.2%
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Largest Holdings [Text Block]
Top Ten Holdings
Axon Enterprise, Inc. 3.8%
Spotify Technology SA 3.3%
Tradeweb Markets, Inc., Class A 3.1%
Flex, Ltd. 3.0%
DraftKings, Inc., Class A 3.0%
Live Nation Entertainment, Inc. 3.0%
Liberty Media Corp.-Liberty Formula One, Series C 2.9%
Pinterest, Inc., Class A 2.9%
Monolithic Power Systems, Inc. 2.8%
On Holding AG, Class A 2.8%
C000236695 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Fundamental Equity Income Fund
Class Name Class I
Trading Symbol JHFEX
Annual or Semi-Annual Statement [Text Block] This semiannual shareholder report contains important information about the John Hancock Fundamental Equity Income Fund (the fund) for the period of April 1, 2024 to September 30, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can request this information by contacting us at 800-225-5291.
Additional Information Phone Number 800-225-5291
Expenses [Text Block]
What were the fund costs during the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Fundamental Equity Income Fund
(Class I/JHFEX)		 $43 0.82%
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.82%
Net Assets $ 10,606,707
Holdings Count | Holding 57
Investment Company Portfolio Turnover 16.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $10,606,707
Total number of portfolio holdings 57
Portfolio turnover rate 16%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing percentage of the total net assets of the fund.
Top Ten Holdings
Crown Castle, Inc. 4.2%
Elevance Health, Inc. 3.7%
Oracle Corp. 3.5%
Comcast Corp., Class A 3.1%
Nasdaq, Inc. 2.9%
GSK PLC, ADR 2.9%
Cheniere Energy, Inc. 2.9%
Gilead Sciences, Inc. 2.7%
Bristol-Myers Squibb Company 2.5%
LyondellBasell Industries NV, Class A 2.5%
Sector Composition
Financials 19.6%
Health care 16.1%
Consumer discretionary 13.2%
Consumer staples 9.9%
Energy 8.1%
Information technology 7.8%
Industrials 5.8%
Real estate 5.2%
Communication services 4.9%
Materials 2.5%
Short-term investments and other 6.9%
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Largest Holdings [Text Block]
Top Ten Holdings
Crown Castle, Inc. 4.2%
Elevance Health, Inc. 3.7%
Oracle Corp. 3.5%
Comcast Corp., Class A 3.1%
Nasdaq, Inc. 2.9%
GSK PLC, ADR 2.9%
Cheniere Energy, Inc. 2.9%
Gilead Sciences, Inc. 2.7%
Bristol-Myers Squibb Company 2.5%
LyondellBasell Industries NV, Class A 2.5%
C000247102 [Member]  
Shareholder Report [Line Items]  
Fund Name Global Climate Action Fund
Class Name Class I
Trading Symbol JLFSX
Annual or Semi-Annual Statement [Text Block] This semiannual shareholder report contains important information about the John Hancock Global Climate Action Fund (the fund) for the period of April 1, 2024 to September 30, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can request this information by contacting us at 800-225-5291.
Additional Information Phone Number 800-225-5291
Expenses [Text Block]
What were the fund costs during the last six months?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Global Climate Action Fund
(Class I/JLFSX)		 $49 0.95%
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.95%
Net Assets $ 6,008,562
Holdings Count | Holding 40
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $6,008,562
Total number of portfolio holdings 40
Portfolio turnover rate 36%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing percentage of the total net assets of the fund.
Top Ten Holdings
Microsoft Corp. 7.3%
Visa, Inc., Class A 4.3%
Salesforce, Inc. 4.1%
London Stock Exchange Group PLC 3.6%
McDonald's Corp. 3.6%
Canadian Pacific Kansas City, Ltd. 3.6%
Amadeus IT Group SA 3.5%
Intertek Group PLC 3.5%
McKesson Corp. 3.4%
Lowe's Companies, Inc. 3.4%
Sector Composition
Information technology 25.8%
Industrials 18.3%
Health care 17.7%
Financials 15.1%
Consumer discretionary 12.6%
Consumer staples 5.3%
Communication services 4.3%
Short-term investments and other 0.9%
Country Composition
Graphical Representation - Allocation 2 Chart
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Largest Holdings [Text Block]
Top Ten Holdings
Microsoft Corp. 7.3%
Visa, Inc., Class A 4.3%
Salesforce, Inc. 4.1%
London Stock Exchange Group PLC 3.6%
McDonald's Corp. 3.6%
Canadian Pacific Kansas City, Ltd. 3.6%
Amadeus IT Group SA 3.5%
Intertek Group PLC 3.5%
McKesson Corp. 3.4%
Lowe's Companies, Inc. 3.4%