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(John Hancock Small Cap Core Fund - Classes A and I) | (John Hancock Small Cap Core Fund)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

To seek long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading

FEES AND EXPENSES

Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in the John Hancock family of funds. Intermediaries may have different policies and procedures regarding the availability of front-end sales charge waivers or CDSC waivers (See Appendix 1 to the prospectus - Intermediary sales charge waivers). More information about these and other discounts is available from your financial representative and on pages 15 to 17 of this prospectus under "Sales charge reductions and waivers" or pages 151 to 155 of the fund's Statement of Additional Information under "Initial sales charge on Class A shares."
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in the John Hancock family of funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption

Shareholder fees (%) (fees paid directly from your investment)
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)

Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent "Other expenses" have been restated from fiscal year amounts to reflect current fees and expenses.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates "Other expenses" have been estimated for the first year after Class A shares of the fund resume operations.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The "Total annual fund operating expenses" shown may not correlate to the fund's ratios of expenses to average net assets shown in the "Financial highlights" section of the fund's prospectus, which does not include "Acquired fund 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 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:
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading

PORTFOLIO TURNOVER

Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. During its most recent fiscal year, the fund's portfolio turnover rate was 59% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 59.00%
Strategy [Heading] rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES

Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of small-capitalization companies. The fund considers small-capitalization companies to be those within the capitalization range of the Russell 2000 Index, with a maximum capitalization of $10.5 billion as of December 31, 2016. The fund generally will not invest in companies with market capitalizations of $5 billion or more. Equity securities include common and preferred stocks, rights, warrants, and depositary receipts.

The manager emphasizes a fundamental, bottom-up approach to individual stock selection, looking for companies with durable, niche business models with the potential for high returns on capital and that the manager believes are undervalued. Companies are screened based on a number of factors, including balance sheet quality, profitability, liquidity, size, and risk profile.

The fund intends to invest in a number of different sectors based on stock selection and sector weightings may vary significantly from its benchmark. The fund may focus its investments in a particular sector or sectors. The fund may invest up to 10% of its total assets in foreign securities including emerging-market securities and securities of non-U.S. companies traded on a U.S. exchange.

The fund may invest in initial public offerings (IPOs), real estate investment trusts (REITs) or other real estate-related equity securities, and certain exchange-traded funds (ETFs).

The fund normally will invest 10% or less of its total assets in cash and cash equivalents, including repurchase agreements, money market securities, U.S. government securities, and other short-term investments. The fund may invest in derivatives to a limited extent. Derivatives may be used to reduce risk and/or obtain efficient market exposure, and may include futures contracts and foreign currency forward contracts.
Risk [Heading] rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Many factors affect performance, and fund shares will fluctuate in price, meaning you could lose money. The fund's investment strategy may not produce the intended results.

During periods of heightened market volatility or reduced liquidity, governments, their agencies, or other regulatory bodies, both within the United States and abroad, may take steps to intervene. These actions, which could include legislative, regulatory, or economic initiatives, might have unforeseeable consequences and could adversely affect the fund's performance or otherwise constrain the fund's ability to achieve its investment objective.

The fund's main risks are listed below in alphabetical order. Before investing, be sure to read the additional descriptions of these risks beginning on page 4 of the prospectus.

Credit and counterparty risk. The counterparty to an over-the-counter derivatives contract or a borrower of fund securities may not make timely payments or otherwise honor its obligations. U.S. government securities are subject to varying degrees of credit risk based on the nature of their support.

Cybersecurity risk. Cybersecurity breaches may allow an unauthorized party to gain access to fund assets, customer data, or proprietary information, or cause a fund or its service providers to suffer data corruption or lose operational functionality. Similar incidents affecting issuers of a fund's securities may negatively impact performance.

Economic and market events risk. Events in the U.S. and global financial markets, including actions taken by the U.S. Federal Reserve or foreign central banks to stimulate or stabilize economic growth, may at times result in unusually high market volatility, which could negatively impact performance. Reduced liquidity in credit and fixed-income markets could adversely affect issuers worldwide. Banks and financial services companies could suffer losses if interest rates rise or economic conditions deteriorate.

Equity securities risk. The price of equity securities may decline due to changes in a company's financial condition or overall market conditions.

Exchange-traded funds risk. An ETF generally reflects the risks of the underlying securities it is designed to track. A fund bears ETF fees and expenses indirectly.

Foreign securities risk. Less information may be publicly available regarding foreign issuers. Foreign securities may be subject to foreign taxes and may be more volatile than U.S. securities. Currency fluctuations and political and economic developments may adversely impact the value of foreign securities. The risks of investing in foreign securities are magnified in emerging markets. Depositary receipts are subject to most of the risks associated with investing in foreign securities directly because the value of a depositary receipt is dependent upon the market price of the underlying foreign equity security. Depositary receipts are also subject to liquidity risk.

Hedging, derivatives, and other strategic transactions risk. Hedging, derivatives, and other strategic transactions may increase a fund's volatility and could produce disproportionate losses, potentially more than the fund's principal investment. Risks of these transactions are different from and possibly greater than risks of investing directly in securities and other traditional instruments. Under certain market conditions, derivatives could become harder to value or sell and may become subject to liquidity risk (i.e., the inability to enter into closing transactions). Derivatives and other strategic transactions that the fund intends to utilize include: foreign currency forward contracts and futures contracts. Foreign currency forward contracts and futures contracts generally are subject to counterparty risk. Derivatives associated with foreign currency transactions are subject to currency risk.

Initial public offerings risk. IPO share prices are frequently volatile and may significantly impact fund performance.

Liquidity risk. The extent (if at all) to which a security may be sold or a derivative position closed without negatively impacting its market value may be impaired by reduced market activity or participation, legal restrictions, or other economic and market impediments.

Preferred and convertible securities risk. Preferred stock dividends are payable only if declared by the issuer's Board. Preferred stock may be subject to redemption provisions. The market values of convertible securities tend to fall as interest rates rise and rise as interest rates fall. Convertible preferred stock's value can depend heavily upon the underlying common stock's value.

Real estate investment trust risk. REITs, pooled investment vehicles that typically invest in real estate directly or in loans collateralized by real estate, carry risks associated with owning real estate, including the potential for a decline in value due to economic or market conditions.

Real estate securities risk. Securities of companies in the real estate industry carry risks associated with owning real estate, including the potential for a decline in value due to economic or market conditions.

Sector risk. When a fund focuses its investments in certain sectors of the economy, its performance may be driven largely by sector performance and could fluctuate more widely than if the fund were invested more evenly across sectors.

Small and mid-sized company risk. Small and mid-sized companies are generally less established and may be more volatile than larger companies. Small and/or mid-capitalization securities may underperform the market as a whole.

Warrants risk. The prices of warrants may not precisely reflect the prices of their underlying securities. Warrant holders do not receive dividends or have voting or credit rights. A warrant ceases to have value if not exercised prior to its expiration date.
Risk Lose Money [Text] rr_RiskLoseMoney Many factors affect performance, and fund shares will fluctuate in price, meaning you could lose money.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading

PAST PERFORMANCE

Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following information illustrates the variability of the fund's returns and provides some indication of the risks of investing in the fund by showing changes in the fund's performance from year to year compared with a broad-based market index. Past performance (before and after taxes) does not indicate future results. All figures assume dividend reinvestment. Performance information is updated daily, monthly, and quarterly and may be obtained at our website, jhinvestments.com, or by calling 800-225-5291, Monday to Thursday, 8:00 A.M.—7:00 P.M., and Friday, 8:00 A.M.—6:00 P.M., Eastern time (Class A), or 888-972-8696 between 8:30 A.M. and 5:00 P.M., Eastern time, on most business days (Class I).

Please note that after-tax returns (shown for Class A shares only) reflect the highest individual federal marginal income-tax rate in effect as of the date provided and do not reflect any state or local taxes. Your actual after-tax returns may be different. After-tax returns are not relevant to shares held in an IRA, 401(k), or other tax-advantaged investment plan. After-tax returns for other share classes would vary.

Class A and Class I shares were first offered on December 20, 2013. Class A shares ceased operations as of March 10, 2016; the returns after that date are those of Class I shares that include Class A sales charges. Returns for Class A shares would have been substantially similar to returns of Class I shares because both share classes are invested in the same portfolio of securities and returns would differ only to the extent that expenses of the classes are different.
Bar Chart [Heading] rr_BarChartHeading

Calendar year total returns (%)—Class A (sales charges are not reflected in the bar chart and returns would have been lower if they were)

Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads sales charges are not reflected in the bar chart and returns would have been lower if they were
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best quarter: Q3 '16, 10.58%
Worst quarter: Q3 '15, -12.42%

Performance Table Heading rr_PerformanceTableHeading

Average annual total returns (%)—as of 12/31/16

Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate Please note that after-tax returns (shown for Class A shares only) reflect the highest individual federal marginal income-tax rate in effect as of the date provided and do not reflect any state or local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your actual after-tax returns may be different. After-tax returns are not relevant to shares held in an IRA, 401(k), or other tax-advantaged investment plan.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) does not indicate future results.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information illustrates the variability of the fund's returns and provides some indication of the risks of investing in the fund by showing changes in the fund's performance from year to year compared with a broad-based market index.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown Please note that after-tax returns (shown for Class A shares only)
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress jhinvestments.com
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-225-5291, Monday to Thursday, 8:00 A.M.—7:00 P.M., and Friday, 8:00 A.M.—6:00 P.M., Eastern time (Class A), or 888-972-8696 between 8:30 A.M. and 5:00 P.M., Eastern time, on most business days (Class I).
(John Hancock Small Cap Core Fund - Classes A and I) | (John Hancock Small Cap Core Fund) | Russell 2000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 21.31%
Since inception rr_AverageAnnualReturnSinceInception 7.87%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2013
(John Hancock Small Cap Core Fund - Classes A and I) | (John Hancock Small Cap Core Fund) | Class A  
Prospectus: rr_ProspectusTable  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther 5.00%
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther 1.00% [1]
Small account fee (for fund account balances under $1,000) ($) rr_ShareholderFeeOther $ 20
Management fee rr_ManagementFeesOverAssets 0.90%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.30%
Other expenses rr_OtherExpensesOverAssets 0.25% [2]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.16% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.61% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 656
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 983
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,332
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,316
Annual Return 2014 rr_AnnualReturn2014 (1.11%)
Annual Return 2015 rr_AnnualReturn2015 (1.71%)
Annual Return 2016 rr_AnnualReturn2016 27.04%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter: Q3 '16, 10.58%
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 10.58%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2016
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter: Q3 '15, -12.42%
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (12.42%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
1 Year rr_AverageAnnualReturnYear01 20.69%
Since inception rr_AverageAnnualReturnSinceInception 6.10%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2013
(John Hancock Small Cap Core Fund - Classes A and I) | (John Hancock Small Cap Core Fund) | Class A | after tax on distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 20.31%
Since inception rr_AverageAnnualReturnSinceInception 5.57%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2013
(John Hancock Small Cap Core Fund - Classes A and I) | (John Hancock Small Cap Core Fund) | Class A | after tax on distributions, with sale  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 11.71%
Since inception rr_AverageAnnualReturnSinceInception 4.47%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2013
(John Hancock Small Cap Core Fund - Classes A and I) | (John Hancock Small Cap Core Fund) | Class I  
Prospectus: rr_ProspectusTable  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther none
Small account fee (for fund account balances under $1,000) ($) rr_ShareholderFeeOther none
Management fee rr_ManagementFeesOverAssets 0.90%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.23% [5]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.16% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.29% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 131
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 409
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 708
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,556
1 Year rr_AverageAnnualReturnYear01 27.06%
Since inception rr_AverageAnnualReturnSinceInception 8.15%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 20, 2013
(John Hancock Small Cap Core Fund - Class NAV) | (John Hancock Small Cap Core Fund)  
Prospectus: rr_ProspectusTable  
Supplement Text Block jhfiismllcpco-20170830_SupplementTextBlock
 
John Hancock Investment Trust
Supplement dated August 30, 2017, to the current John Hancock Equity and Alternative/Specialty Funds Class NAV Prospectus (the "Prospectus")
 
John Hancock Small Cap Core Fund (the fund)
 
Effective immediately, 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)
NAV
Management fee
0.90
Other expenses1
0.12
Acquired fund fees and expenses2
0.16
Total annual fund operating expenses3
1.18
1 "Other expenses" have been restated from fiscal year amounts to reflect current fees and expenses.
2 "Acquired fund fees and expenses" are based on indirect net expenses associated with the fund's investments in underlying investment companies.
3 The "Total annual fund operating expenses" shown may not correlate to the fund's ratios of expenses to average net assets shown in the "Financial highlights" section of the fund's prospectus, which does not include "Acquired fund fees and 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 ($)
NAV
1 year
120
3 years
375
5 years
649
10 years
1,432
 
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)

Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent "Other expenses" have been restated from fiscal year amounts to reflect current fees and expenses.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The "Total annual fund operating expenses" shown may not correlate to the fund's ratios of expenses to average net assets shown in the "Financial highlights" section of the fund's prospectus, which does not include "Acquired fund 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 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 NAV) | (John Hancock Small Cap Core Fund) | Class NAV  
Prospectus: rr_ProspectusTable  
Management fee rr_ManagementFeesOverAssets 0.90%
Other expenses rr_OtherExpensesOverAssets 0.12% [5]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.16% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.18% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 120
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 375
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 649
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,432
[1] (on certain purchases, including those of $1 million or more)
[2] "Other expenses" have been estimated for the first year after Class A shares of the fund resume operations.
[3] "Acquired fund fees and expenses" are based on indirect net expenses associated with the fund's investments in underlying investment companies.
[4] The "Total annual fund operating expenses" shown may not correlate to the fund's ratios of expenses to average net assets shown in the "Financial highlights" section of the fund's prospectus, which does not include "Acquired fund fees and expenses."
[5] "Other expenses" have been restated from fiscal year amounts to reflect current fees and expenses.