Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Period End Date	dei_DocumentPeriodEndDate	Oct. 31, 2024
Registrant Name	dei_EntityRegistrantName	JOHN HANCOCK INVESTMENT TRUST
CIK	dei_EntityCentralIndexKey	0000022370
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Feb. 26, 2025
Document Effective Date	dei_DocumentEffectiveDate	Mar. 01, 2025
Prospectus Date	rr_ProspectusDate	Mar. 01, 2025
Entity Inv Company Type	dei_EntityInvCompanyType	N-1A
John Hancock Balanced Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	SVBAX
John Hancock Balanced Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	SVBCX
John Hancock Balanced Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	SVBIX
John Hancock Balanced Fund \| Class R2
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JBATX
John Hancock Balanced Fund \| Class R4
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JBAFX
John Hancock Balanced Fund \| Class R5
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JBAVX
John Hancock Balanced Fund \| Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JBAWX
John Hancock Disciplined Value International Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JDIBX
John Hancock Disciplined Value International Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JDICX
John Hancock Disciplined Value International Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JDVIX
John Hancock Disciplined Value International Fund \| Class R2
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JDISX
John Hancock Disciplined Value International Fund \| Class R4
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JDITX
John Hancock Disciplined Value International Fund \| Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JDIUX
John Hancock Disciplined Value International Fund \| Class NAV
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JDIVX
John Hancock Diversified Macro Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JDJAX
John Hancock Diversified Macro Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JDJCX
John Hancock Diversified Macro Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JDJIX
John Hancock Diversified Macro Fund \| Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JDJRX
John Hancock Emerging Markets Equity Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JEMQX
John Hancock Emerging Markets Equity Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JEMZX
John Hancock Emerging Markets Equity Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JEMMX
John Hancock Emerging Markets Equity Fund \| Class R2
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JEMKX
John Hancock Emerging Markets Equity Fund \| Class R4
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JEMNX
John Hancock Emerging Markets Equity Fund \| Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JEMGX
John Hancock ESG International Equity Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JTQAX
John Hancock ESG International Equity Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JTQIX
John Hancock ESG International Equity Fund \| Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JTQRX
John Hancock ESG Large Cap Core Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JHJAX
John Hancock ESG Large Cap Core Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JHJCX
John Hancock ESG Large Cap Core Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JHJIX
John Hancock ESG Large Cap Core Fund \| Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JHJRX
John Hancock Fundamental Large Cap Core Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TAGRX
John Hancock Fundamental Large Cap Core Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JHLVX
John Hancock Fundamental Large Cap Core Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JLVIX
John Hancock Fundamental Large Cap Core Fund \| Class R2
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JLCYX
John Hancock Fundamental Large Cap Core Fund \| Class R4
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JLCFX
John Hancock Fundamental Large Cap Core Fund \| Class R5
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JLCVX
John Hancock Fundamental Large Cap Core Fund \| Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JLCWX
John Hancock Fundamental Large Cap Core Fund \| Class NAV
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JLCNX
John Hancock Global Environmental Opportunities Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JABZX
John Hancock Global Environmental Opportunities Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JABYX
John Hancock Global Environmental Opportunities Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JABVX
John Hancock Global Environmental Opportunities Fund \| Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JACDX
John Hancock Global Thematic Opportunities Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JTKAX
John Hancock Global Thematic Opportunities Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JTKCX
John Hancock Global Thematic Opportunities Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JTKIX
John Hancock Global Thematic Opportunities Fund \| Class NAV
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JTKNX
John Hancock Infrastructure Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JEEBX
John Hancock Infrastructure Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JEEFX
John Hancock Infrastructure Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JEEIX
John Hancock Infrastructure Fund \| Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JEEDX
John Hancock International Dynamic Growth Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JIJAX
John Hancock International Dynamic Growth Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JIJCX
John Hancock International Dynamic Growth Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JIJIX
John Hancock International Dynamic Growth Fund \| Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JIJRX
John Hancock Seaport Long Short Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JSFBX
John Hancock Seaport Long Short Fund \| Class C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JSFTX
John Hancock Seaport Long Short Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JSFDX
John Hancock Seaport Long Short Fund \| Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JSFRX
John Hancock Small Cap Core Fund \| Class A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JCCAX
John Hancock Small Cap Core Fund \| Class I
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JCCIX
John Hancock Small Cap Core Fund \| Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	JORSX

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

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- Definition

The date the document was made available and submitted, in YYYY-MM-DD format. The date of submission, date of acceptance by the recipient, and the document effective date are all potentially different.

+ References

No definition available.

+ Details

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Data Type:	xbrli:dateItemType
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- Definition

The date when a document, upon receipt and acceptance, becomes officially effective, in YYYY-MM-DD format. Usually it is a system-assigned date time value, but it may be declared by the submitter in some cases.

+ References

No definition available.

+ Details

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Namespace Prefix:	dei_
Data Type:	xbrli:dateItemType
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- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

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Data Type:	xbrli:dateItemType
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Period Type:	duration

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

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Namespace Prefix:	dei_
Data Type:	dei:submissionTypeItemType
Balance Type:	na
Period Type:	duration

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2

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- Definition

One of: N-1A (Mutual Fund), N-1 (Open-End Separate Account with No Variable Annuities), N-2 (Closed-End Investment Company), N-3 (Separate Account Registered as Open-End Management Investment Company), N-4 (Variable Annuity UIT Separate Account), N-5 (Small Business Investment Company), N-6 (Variable Life UIT Separate Account), S-1 or S-3 (Face Amount Certificate Company), S-6 (UIT, Non-Insurance Product).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-T
-Number 232
-Section 313

+ Details

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Namespace Prefix:	dei_
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Period Type:	duration

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2

+ Details

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Namespace Prefix:	dei_
Data Type:	xbrli:normalizedStringItemType
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- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

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Namespace Prefix:	dei_
Data Type:	dei:tradingSymbolItemType
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Period Type:	duration

- Definition

The date of the prospectus.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 1
-Subsection a
-Paragraph 3

+ Details

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Namespace Prefix:	rr_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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