Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	JOHN HANCOCK INVESTMENT TRUST
Prospectus Date	rr_ProspectusDate	Mar. 01, 2025
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:24pt;">John Hancock Balanced Fund</span>
Objective [Heading]	rr_ObjectiveHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Investment objective</span>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	To seek current income, long-term growth of capital and income and preservation of capital.
Expense [Heading]	rr_ExpenseHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Fees and expenses</span>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses you may pay if you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 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 contingent deferred sales charge (CDSC) waivers (See Appendix 1 - Intermediary sales charge waivers, which includes information about specific sales charge waivers applicable to the intermediaries identified therein). More information about these and other discounts is available from your financial professional and beginning on page 24 of the prospectus under “Sales charge reductions and waivers” or page 122 of the fund’s Statement of Additional Information under “Sales Charges on Class A and Class C Shares.”
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Shareholder fees (%) </span><span style="color:#000000;font-family:Arial Narrow;font-size:8pt;margin-left:0.0pt;">(fees paid directly from your investment)</span>
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Annual fund operating expenses (%) </span><span style="font-family:Arial Narrow;font-size:8pt;margin-left:0.0pt;">(expenses that you pay each year as a </span><span style="font-family:Arial Narrow;font-size:8pt;margin-left:0.0pt;">percentage of the value of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	<span style="font-family:Arial Narrow;font-size:8pt;">July 31, 2026</span><span style="font-family:Arial Narrow;font-size:8pt;">February 28, 2026</span>
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Portfolio turnover</span>
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 67% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	67.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">You may qualify for sales </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">50,000</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;"> in the John Hancock family of funds.</span>
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expense Example [Heading]	rr_ExpenseExampleHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Expense example</span>
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	<span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Shares Sold</span>
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	<span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Shares</span><span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Not Sold</span>
Strategy [Heading]	rr_StrategyHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal investment strategies</span>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the fund invests at least 25% of assets in equity securities and at least 25% of assets in senior debt securities. The fund allocates its investments among a diversified mix of debt and equity securities, including securities of other investment companies that invest in debt and equity securities. For the equity portfolio, the manager looks for companies that appear to be undervalued compared to their historical valuations relative to the market. The manager uses fundamental financial analysis and proprietary financial models to identify companies of any size that are selling at a discount as measured by ratios such as price-to-book, price-to-earnings, and price-to-sales. The manager then looks for a positive catalyst in a company’s near-term outlook that it believes will accelerate earnings or improve value of the company’s assets. These positive catalysts may include, but are not limited to, new, improved, or unique products or services; new or rapidly expanding markets for the company’s products; new management; changes in the economic, financial, political, or regulatory environment affecting the company; or a business strategy not recognized by the marketplace. The manager also considers an issuer’s dividend-paying prospects and overall financial strength. The manager considers environmental, social, and/or governance (ESG) factors, alongside other relevant factors, as part of its investment process. ESG factors may include, but are not limited to, matters regarding board diversity, climate change policies, and supply chain and human rights policies. The ESG characteristics utilized in the fund’s investment process may change over time and one or more characteristics may not be relevant with respect to all issuers that are eligible fund investments. Because ESG factors are considered alongside other relevant factors, the manager may determine that an investment is appropriate notwithstanding its relative ESG characteristics. The fund’s debt portfolio is intended to enhance current income and provide added stability. The fund may invest in bonds of any maturity. The fund’s bond investments are primarily rated investment-grade (rated BBB or above by S&P Global Ratings (S&P) or Baa or above by Moody’s Investors Service, Inc. (Moody’s) and unrated equivalents). Up to 20% of assets may be invested in below-investment-grade bonds (i.e., junk bonds) rated as low as C by S&P or Moody’s and their unrated equivalents. The fund’s investment policies are based on credit ratings at the time of purchase. Although the fund invests primarily in U.S. securities, it may invest up to 35% of assets in foreign securities. The fund may invest up to 50% of assets in mortgage-backed securities. The fund may trade securities actively. The fund may engage in derivatives transactions to a limited extent. Derivatives may be used to reduce risk and/or obtain efficient market exposure, and may include futures contracts, options, and foreign currency forward contracts.
Risk [Heading]	rr_RiskHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal risks</span>
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Past performance</span>
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 and by showing how the fund’s average annual returns compared with a broad-based securities market index. Past performance (before and after taxes) does not indicate future results. The Bloomberg U.S. Aggregate Bond Index and the 60% S&P 500 Index/40% Bloomberg U.S. Aggregate Bond Index show how the fund’s performance compares against the returns of similar investments. 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 (Class A and Class C), Monday to Thursday, 8:00 a.m.—7:00 p.m., and Friday, 8:00 a.m.—6:00 p.m., Eastern time, or 888-972-8696 (Class I, Class R2, Class R4, Class R5, and Class R6) between 8:30 a.m. and 5:00 p.m., Eastern time, on most business days.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. The returns for Class A shares have been adjusted to reflect the reduction in the maximum sales charge from 5.00% to 4.50%, effective August 1, 2019.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	<span style="font-family:Arial Narrow;font-size:9pt;">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 and by showing how the fund’s average annual returns compared with a broad-based securities market index. </span>
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	<span style="font-family:Arial Narrow;font-size:9pt;">800-225-5291 (Class A and Class C), Monday to Thursday, 8:00 </span><span style="font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">a.m.</span><span style="font-family:Arial Narrow;font-size:9pt;">—7:00</span><span style="font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">p.m.</span><span style="font-family:Arial Narrow;font-size:9pt;">, and Friday, 8:00</span><span style="font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">a.m.</span><span style="font-family:Arial Narrow;font-size:9pt;">—6:00</span><span style="font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">p.m.</span><span style="font-family:Arial Narrow;font-size:9pt;">, Eastern time, or 888-972-8696 (Class I, Class R2, Class R4, Class R5, and Class R6) between 8:30</span><span style="font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">a.m.</span><span style="font-family:Arial Narrow;font-size:9pt;"> and 5:00</span><span style="font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">p.m.</span><span style="font-family:Arial Narrow;font-size:9pt;">, Eastern time, on most business days.</span>
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	<span style="font-family:Arial Narrow;font-size:9pt;">jhinvestments.com</span>
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	<span style="font-family:Arial Narrow;font-size:9pt;">Past performance (before and after taxes) does not indicate future results.</span>
Bar Chart [Heading]	rr_BarChartHeading	<span style="font-family:Arial Narrow;font-size:9pt;font-weight:bold;">Calendar year total returns (%)—Class A </span><span style="font-family:Arial Narrow;font-size:9pt;">(</span><span style="font-family:Arial Narrow;font-size:9pt;">sales charges are not reflected in the bar chart and returns would have been lower if they were</span><span style="font-family:Arial Narrow;font-size:9pt;">)</span>
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	<span style="font-family:Arial Narrow;font-size:9pt;">sales charges are not reflected in the bar chart and returns would have been lower if they were</span>
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best quarter:Q2 202014.79%Worst quarter:Q2 2022-11.87%
Performance Table Heading	rr_PerformanceTableHeading	<span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Average annual total returns (%)—as of 12/31/2024</span>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">Please note that after-tax returns (shown for Class A shares only)</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;"> reflect the highest individual federal marginal income-tax rate in effect as of the date </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">provided and do not reflect any state or local taxes.</span>
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;"> Your actual after-tax returns may be different. After-tax returns are not relevant to shares held in an </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">IRA, 401(k), or other tax-advantaged investment plan.</span>
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	<span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">Please note that after-tax returns (shown for Class A shares only)</span>
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Risk Lose Money [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Many factors affect performance, and fund shares will fluctuate in price, meaning you could lose money.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Risk Not Insured Depository Institution [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	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.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Credit And Counterparty Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Credit and counterparty risk.  The issuer or guarantor of a fixed-income security, 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. A downgrade or default affecting any of the fund’s securities could affect the fund’s performance.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Economic And Market Events Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	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.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Equity Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Equity securities risk.  The price of equity securities may decline due to changes in a company’s financial condition or overall market conditions. Securities the manager believes are undervalued may never realize their full potential value, and in certain markets value stocks may underperform the market as a whole.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | ESG Integration Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	ESG integration risk.  The manager considers ESG factors that it deems relevant or additive, along with other material factors and analysis, when managing the fund. ESG factors may include, but are not limited to, matters regarding board diversity, climate change policies, and supply chain and human rights policies. The manager may consider these ESG factors on all or a meaningful portion of the fund’s investments. Incorporating ESG criteria and making investment decisions based on certain ESG characteristics, as determined by the manager, carries the risk that the fund may perform differently, including underperforming, funds that do not utilize ESG criteria, or funds that utilize different ESG criteria.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Fixed Income Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Fixed-income securities risk.  A rise in interest rates typically causes bond prices to fall. The longer the average maturity or duration of the bonds held by a fund, the more sensitive it will likely be to interest-rate fluctuations. An issuer may not make all interest payments or repay all or any of the principal borrowed. Changes in a security’s credit quality may adversely affect fund performance.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Foreign Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Foreign securities risk.  Less information may be publicly available regarding foreign issuers, including foreign government 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.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Hedging Derivatives And Other Strategic Transactions Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	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, futures contracts, and options. Foreign currency forward contracts, futures contracts, and options generally are subject to counterparty risk. Derivatives associated with foreign currency transactions are subject to currency risk.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | High Portfolio Turnover Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	High portfolio turnover risk.  Trading securities actively and frequently can increase transaction costs (thus lowering performance) and taxable distributions.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Investment Company Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Investment company securities risk.  Fund shareholders indirectly bear their proportionate share of the expenses of any investment company in which the fund invests. The total return on such investments will be reduced by the operating expenses and fees of such other investment companies, including advisory fees.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Large Company Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Large company risk.  Larger companies may grow more slowly than smaller companies or be slower to respond to business developments. Large-capitalization securities may underperform the market as a whole.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Liquidity Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	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. Liquidity risk may be magnified in rising interest rate environments due to higher than normal redemption rates. Widespread selling of fixed-income securities to satisfy redemptions during periods of reduced demand may adversely impact the price or salability of such securities. Periods of heavy redemption could cause the fund to sell assets at a loss or depressed value, which could negatively affect performance. Redemption risk is heightened during periods of declining or illiquid markets.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Lower Rated And High Yield Fixed Income Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Lower-rated and high-yield fixed-income securities risk.  Lower-rated and high-yield fixed-income securities (junk bonds) are subject to greater credit quality risk, risk of default, and price volatility than higher-rated fixed-income securities, may be considered speculative, and can be difficult to resell.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Mortgage Backed And Asset Backed Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Mortgage-backed and asset-backed securities risk.  Mortgage-backed and asset-backed securities are subject to different combinations of prepayment, extension, interest-rate, and other market risks. Factors that impact the value of these securities include interest rate changes, the reliability of available information, credit quality or enhancement, and market perception.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Operational And Cybersecurity Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Operational and 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. Operational risk may arise from human error, error by third parties, communication errors, or technology failures, among other causes.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Small And Mid Sized Company Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	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.
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Class A
Risk Return Abstract	rr_RiskReturnAbstract
Maximum front-end sales charge (load) on purchases, as a % of purchase price	rr_MaximumCumulativeSalesChargeOverOfferingPrice	4.50%
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Small account fee (for fund account balances under $1,000) ($)	rr_MaximumAccountFee	$ 20
Management fee	rr_ManagementFeesOverAssets	0.57%
Distribution and service (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Service plan fee	rr_Component1OtherExpensesOverAssets	none
Additional other expenses	rr_Component2OtherExpensesOverAssets	0.17%
Total other expenses	rr_OtherExpensesOverAssets	0.17%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.04%
Contractual expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.01%)	[1]
Total annual fund operating expenses after expense reimbursements	rr_NetExpensesOverAssets	1.03%
1 year	rr_ExpenseExampleYear01	$ 550
3 years	rr_ExpenseExampleYear03	765
5 years	rr_ExpenseExampleYear05	997
10 years	rr_ExpenseExampleYear10	$ 1,663
2015	rr_AnnualReturn2015	(1.90%)
2016	rr_AnnualReturn2016	8.08%
2017	rr_AnnualReturn2017	13.92%
2018	rr_AnnualReturn2018	(4.95%)
2019	rr_AnnualReturn2019	21.28%
2020	rr_AnnualReturn2020	15.97%
2021	rr_AnnualReturn2021	14.50%
2022	rr_AnnualReturn2022	(15.78%)
2023	rr_AnnualReturn2023	18.21%
2024	rr_AnnualReturn2024	13.29%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Best quarter:</span>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2020
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	14.79%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Worst quarter:</span>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Jun. 30, 2022
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(11.87%)
1 year	rr_AverageAnnualReturnYear01	8.20%
5 year	rr_AverageAnnualReturnYear05	7.42%
10 year	rr_AverageAnnualReturnYear10	7.13%
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Class C
Risk Return Abstract	rr_RiskReturnAbstract
Maximum front-end sales charge (load) on purchases, as a % of purchase price	rr_MaximumCumulativeSalesChargeOverOfferingPrice	none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Small account fee (for fund account balances under $1,000) ($)	rr_MaximumAccountFee	$ 20
Management fee	rr_ManagementFeesOverAssets	0.57%
Distribution and service (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Service plan fee	rr_Component1OtherExpensesOverAssets	none
Additional other expenses	rr_Component2OtherExpensesOverAssets	0.17%
Total other expenses	rr_OtherExpensesOverAssets	0.17%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.74%
Contractual expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.01%)	[1]
Total annual fund operating expenses after expense reimbursements	rr_NetExpensesOverAssets	1.73%
1 year	rr_ExpenseExampleYear01	$ 276
3 years	rr_ExpenseExampleYear03	547
5 years	rr_ExpenseExampleYear05	943
10 years	rr_ExpenseExampleYear10	1,866
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	176
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	547
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	943
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,866
1 year	rr_AverageAnnualReturnYear01	11.49%
5 year	rr_AverageAnnualReturnYear05	7.66%
10 year	rr_AverageAnnualReturnYear10	6.87%
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Class I
Risk Return Abstract	rr_RiskReturnAbstract
Maximum front-end sales charge (load) on purchases, as a % of purchase price	rr_MaximumCumulativeSalesChargeOverOfferingPrice	none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Small account fee (for fund account balances under $1,000) ($)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.57%
Distribution and service (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Service plan fee	rr_Component1OtherExpensesOverAssets	none
Additional other expenses	rr_Component2OtherExpensesOverAssets	0.17%
Total other expenses	rr_OtherExpensesOverAssets	0.17%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.74%
Contractual expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.01%)	[1]
Total annual fund operating expenses after expense reimbursements	rr_NetExpensesOverAssets	0.73%
1 year	rr_ExpenseExampleYear01	$ 75
3 years	rr_ExpenseExampleYear03	236
5 years	rr_ExpenseExampleYear05	410
10 years	rr_ExpenseExampleYear10	$ 917
1 year	rr_AverageAnnualReturnYear01	13.60%
5 year	rr_AverageAnnualReturnYear05	8.74%
10 year	rr_AverageAnnualReturnYear10	7.95%
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Class R2
Risk Return Abstract	rr_RiskReturnAbstract
Maximum front-end sales charge (load) on purchases, as a % of purchase price	rr_MaximumCumulativeSalesChargeOverOfferingPrice	none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Small account fee (for fund account balances under $1,000) ($)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.57%
Distribution and service (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Service plan fee	rr_Component1OtherExpensesOverAssets	0.25%	[2]
Additional other expenses	rr_Component2OtherExpensesOverAssets	0.06%
Total other expenses	rr_OtherExpensesOverAssets	0.31%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.13%
Contractual expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.01%)	[1]
Total annual fund operating expenses after expense reimbursements	rr_NetExpensesOverAssets	1.12%
1 year	rr_ExpenseExampleYear01	$ 114
3 years	rr_ExpenseExampleYear03	358
5 years	rr_ExpenseExampleYear05	621
10 years	rr_ExpenseExampleYear10	$ 1,374
1 year	rr_AverageAnnualReturnYear01	13.16%
5 year	rr_AverageAnnualReturnYear05	8.32%
10 year	rr_AverageAnnualReturnYear10	7.53%
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Class R4
Risk Return Abstract	rr_RiskReturnAbstract
Maximum front-end sales charge (load) on purchases, as a % of purchase price	rr_MaximumCumulativeSalesChargeOverOfferingPrice	none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Small account fee (for fund account balances under $1,000) ($)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.57%
Distribution and service (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Service plan fee	rr_Component1OtherExpensesOverAssets	0.10%	[2]
Additional other expenses	rr_Component2OtherExpensesOverAssets	0.06%
Total other expenses	rr_OtherExpensesOverAssets	0.16%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.98%
Contractual expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.11%)	[1],[3]
Total annual fund operating expenses after expense reimbursements	rr_NetExpensesOverAssets	0.87%
1 year	rr_ExpenseExampleYear01	$ 89
3 years	rr_ExpenseExampleYear03	301
5 years	rr_ExpenseExampleYear05	531
10 years	rr_ExpenseExampleYear10	$ 1,191
1 year	rr_AverageAnnualReturnYear01	13.47%
5 year	rr_AverageAnnualReturnYear05	8.59%
10 year	rr_AverageAnnualReturnYear10	7.80%
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Class R5
Risk Return Abstract	rr_RiskReturnAbstract
Maximum front-end sales charge (load) on purchases, as a % of purchase price	rr_MaximumCumulativeSalesChargeOverOfferingPrice	none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Small account fee (for fund account balances under $1,000) ($)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.57%
Distribution and service (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Service plan fee	rr_Component1OtherExpensesOverAssets	0.05%	[2]
Additional other expenses	rr_Component2OtherExpensesOverAssets	0.06%
Total other expenses	rr_OtherExpensesOverAssets	0.11%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.68%
Contractual expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.01%)	[1]
Total annual fund operating expenses after expense reimbursements	rr_NetExpensesOverAssets	0.67%
1 year	rr_ExpenseExampleYear01	$ 68
3 years	rr_ExpenseExampleYear03	217
5 years	rr_ExpenseExampleYear05	378
10 years	rr_ExpenseExampleYear10	$ 846
1 year	rr_AverageAnnualReturnYear01	13.68%
5 year	rr_AverageAnnualReturnYear05	8.81%
10 year	rr_AverageAnnualReturnYear10	8.01%
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Maximum front-end sales charge (load) on purchases, as a % of purchase price	rr_MaximumCumulativeSalesChargeOverOfferingPrice	none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Small account fee (for fund account balances under $1,000) ($)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.57%
Distribution and service (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Service plan fee	rr_Component1OtherExpensesOverAssets	none
Additional other expenses	rr_Component2OtherExpensesOverAssets	0.06%
Total other expenses	rr_OtherExpensesOverAssets	0.06%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.63%
Contractual expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.01%)	[1]
Total annual fund operating expenses after expense reimbursements	rr_NetExpensesOverAssets	0.62%
1 year	rr_ExpenseExampleYear01	$ 63
3 years	rr_ExpenseExampleYear03	201
5 years	rr_ExpenseExampleYear05	350
10 years	rr_ExpenseExampleYear10	$ 785
1 year	rr_AverageAnnualReturnYear01	13.73%
5 year	rr_AverageAnnualReturnYear05	8.86%
10 year	rr_AverageAnnualReturnYear10	8.07%
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Return After Taxes on Distributions | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	7.11%
5 year	rr_AverageAnnualReturnYear05	6.71%
10 year	rr_AverageAnnualReturnYear10	6.21%
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Return After Taxes on Distributions and Sale of Shares | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	5.35%
5 year	rr_AverageAnnualReturnYear05	5.63%
10 year	rr_AverageAnnualReturnYear10	5.43%
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | S&P 500 Index (reflects no deduction for fees, expenses, or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	25.02%
5 year	rr_AverageAnnualReturnYear05	14.53%
10 year	rr_AverageAnnualReturnYear10	13.10%
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	1.25%
5 year	rr_AverageAnnualReturnYear05	(0.33%)
10 year	rr_AverageAnnualReturnYear10	1.35%
Class A C I R2 R4 R5 R6 | John Hancock Balanced Fund | 60% S&P 500 Index/40% Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 year	rr_AverageAnnualReturnYear01	15.04%
5 year	rr_AverageAnnualReturnYear05	8.67%
10 year	rr_AverageAnnualReturnYear10	8.52%

[1] 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, including the fund (the participating portfolios). This waiver equals, on an annualized basis, 0.0100% of that portion of the aggregate net assets of all the participating portfolios that exceeds $75 billion but is less than or equal to $125 billion; 0.0125% of that portion of the aggregate net assets of all the participating portfolios that exceeds $125 billion but is less than or equal to $150 billion; 0.0150% of that portion of the aggregate net assets of all the participating portfolios that exceeds $150 billion but is less than or equal to $175 billion; 0.0175% of that portion of the aggregate net assets of all the participating portfolios that exceeds $175 billion but is less than or equal to $200 billion; 0.0200% of that portion of the aggregate net assets of all the participating portfolios that exceeds $200 billion but is less than or equal to $225 billion; and 0.0225% of that portion of the aggregate net assets of all the participating portfolios that exceeds $225 billion. The amount of the reimbursement is calculated daily and allocated among all the participating portfolios in proportion to the daily net assets of each participating portfolio. 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, 2026, 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.

[2] “Service plan fee” has been restated to reflect maximum allowable fees.

[3] The distributor contractually agrees to limit its Rule 12b-1 fees for Class R4 shares to 0.15%. This agreement expires on February 28, 2026, 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.