Objective, Primary [Text Block]

rr_ProspectusTable

Objective [Heading]

rr_ObjectiveHeading

Investment objective

rr_ObjectivePrimaryTextBlock

To seek growth through capital appreciation by investing primarily in Environmental Companies (as defined below).

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, 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 on pages 22 to 24 of the prospectus under “Sales charge reductions and waivers” or pages 123 to 127 of the fund’s Statement of Additional Information under “Sales Charges on Class A and Class C 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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

July 31, 2023

Other Expenses, New Fund, Based on Estimates [Text]

rr_OtherExpensesNewFundBasedOnEstimates

“Other expenses” have been estimated for the fund’s first year of operations.

Expense Example [Heading]

rr_ExpenseExampleHeading

Expense example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. Please see below a hypothetical example showing the expenses of a $10,000 investment for the time periods indicated and then, except as shown below, assuming you sell all of your shares at the end of those periods. The example assumes a 5% average annual return and that fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sold

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

rr_ExpenseExampleNoRedemptionByYearCaption

Not Sold

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 the fiscal period from July 21, 2021 (commencement of operations) through October 31, 2021, the fund’s portfolio turnover rate was 7% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

7.00%

Strategy [Heading]

rr_StrategyHeading

Principal investment strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in securities of Environmental Companies.

The Planetary Boundaries

The Planetary Boundaries (PB) is the scientific environmental framework which the manager uses to identify Environmental Companies. The PB framework was developed by a group of universities across the world. The PB framework identifies a set of nine boundaries considered most crucial for maintaining the stability of the earth’s ecosystems on which human society depends. Remaining within these nine boundaries is considered the “Safe Operating Space,” within which human society and the planet can continue to thrive. Exceeding those boundaries (i.e., being outside the Safe Operating Space) will increase the risk of large-scale adverse or irreversible environmental changes that will negatively impact the future of human society and development.

The nine environmental boundaries as originally identified and quantified in 2009 are: climate change; rate of biodiversity loss (terrestrial and marine); interference with the nitrogen and phosphorus cycles (i.e., biogeochemical flows); stratospheric ozone depletion; ocean acidification; global freshwater use; change in land use; chemical pollution; and atmospheric aerosol. Further information on each of the boundaries is set forth below under “Information Regarding the Planetary Boundaries.”

As of June 28, 2021, the following boundaries have been crossed: climate change, rate of biodiversity loss, land-system change and biogeochemical flows. This does not impact the manager’s investment process, as a boundary that has been crossed simply implies a greater need to reduce stress on that boundary to reverse the trend. The PB framework is not a static framework but subject to change based on evolving scientific research. The following is a graphic representation of the boundaries as of March 2021, this is used for illustrative purposes to demonstrate the PB framework and may change.

Defining Environmental Companies

The manager defines Environmental Companies as:

1	Companies that operate within the Safe Operating Space of the Planetary Boundaries, and

2	Companies, all or a portion of whose business activities reduce stress in at least one of the boundaries in the PB framework.

The two-step process to identify investable Environmental Companies applied by the manager is detailed below.

Step One: The manager screens the global universe of equity companies (approximately 40,000 companies) for those that have environmental footprints within the Safe Operating Space of the PB framework. Environmental footprint is defined as the effect that a person, company, and/or activity has on the environment, such as the amount of natural resources that they use and the amount of harmful gases that they produce.

This first step is achieved by a screening process that includes a Life Cycle Assessment (LCA) analysis to identify companies whose activities, operations and products across their whole life cycle are within the Safe Operating Space of the PB framework. The LCA analysis assesses the impact on the nine boundaries associated with all the stages of the life of a company’s products, services or activities. To facilitate this analysis, the manager has developed a proprietary LCA database using their own data as well as inputs from various external databases. The underlying data used as inputs for the manager’s proprietary LCA database include over 30 different types of environmental impact measures (for example, Methane emission, CFC (Chlorofluorocarbon) emissions, Water consumption, and CO2 emissions). External databases used to develop the LCA database include those from

universities, other third-party providers and other proprietary LCA databases. The LCA analysis may be complemented by input from environmental consulting companies that specialize in Life Cycle Assessments and have partnered exclusively with the manager. The inputs the manager uses for the LCA database, and any current partnerships with external environmental consultants, are subject to change.

If a company is operating beyond the Safe Operating Space of one boundary, but is within the Safe Operating Space of another boundary, the manager would consider the average impact of the company across all boundaries and the company would not be prohibited from passing the screen. Typically, 4,000 companies pass through the screen at this part of the process.

Step Two: After screening for companies that are within the Safe Operating Space defined by the Planetary Boundaries in Step One, the manager then narrows this investable universe to identify Environmental Companies. To be eligible as an Environmental Company, all or a portion of a company’s business activities must reduce stress in at least one or more of the planetary boundaries. Specifically, the company must reduce the impact of human activity on such boundary so that the boundary is not exceeded or further exceeded.

Business activities are defined as selling and/or creating products, technologies and/or services, including the provision of related support services. These business activities include those related to water usage, energy efficiency, renewable energy, sustainable forestry, organic agriculture, pollution control, dematerialized economy, waste management and recycling, as well as any the manager identifies as reducing stress on one or more Planetary Boundaries.

To measure whether a business activity reduces stress in any boundary, the manager uses quantitative inputs from the proprietary LCA analysis and database referred to above. The manager is able to complement this with qualitative judgement based on its knowledge of the company and experience with environmental business activities to determine whether an Environmental Company reduces stress on one or more boundaries. Typically, 400 stocks are identified and defined as Environmental Companies after Step One and Step Two.

Portfolio Construction

Once the universe of Environmental Companies is identified, the manager applies in-depth fundamental research to select the companies that the manager believes present the most attractive risk-return characteristics. In this analysis, the manager considers fundamental characteristics such as the company’s competitiveness, management quality, valuation and industry risk factors. The analysis also systematically integrates Social and Governance ESG factors at this stage of the portfolio construction process. Environmental and Social factors are evaluated as part of a company’s competitiveness and business franchise characteristics. The manager forms its own view based on primary research but is also supported by external data from third-party providers. The manager’s view on a company’s Governance is also integrated as part of the analysis on management quality, where the manager’s primary research and views are complemented by third-party data providers. A low ESG score would affect the overall score assigned to the security by the manager and, therefore, whether the security is chosen for the fund and, if chosen, the weight of that security in the portfolio. The ESG factors utilized during this stage of the portfolio construction process may change over time. The final result is a high conviction portfolio of between 40 to 60 Environmental Companies.

The fund may invest in equity and equity-related securities issued by U.S. and non-U.S. companies, including common, convertible and preferred stock, warrants and depositary receipts. The fund does not limit its investments to companies in a particular market capitalization range and, at times, may invest a substantial portion of its assets in one or more particular market capitalization ranges.

The fund seeks investment exposure to a number of countries throughout the world. Under normal circumstances, the fund will invest in companies domiciled, incorporated, organized or headquartered in at least three countries outside the U.S., including developing and emerging market countries (Foreign Companies). The manager will consider, but is not limited to, the MSCI market classifications in determining whether a country is a developed or emerging market country. Although the fund can invest up to 100% of its assets in the securities of Foreign Companies, under normal circumstances it generally expects to invest at least 40% of its assets in the securities of such companies. However, if the manager determines, in its sole discretion, that market conditions are not favorable, the fund may invest less than 40% of its assets in Foreign Companies, but will not invest less than 30% of its assets in Foreign Companies.

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, not in order of importance. Before investing, be sure to read the additional descriptions of these risks beginning on page 8 of the prospectus.

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.

Environmentally focused investing risk. The fund’s environmental criteria limit the available investments compared to funds with no such criteria. The fund’s incorporation of environmental criteria may affect the fund’s exposure to certain sectors and/or types of investments, and under certain economic conditions, this could cause the fund to underperform funds that invest in a broader array of investments depending on whether such sectors or investments are in or out of favor in the market. The data provided by third parties may be incomplete, inaccurate or unavailable, which could cause the manager to incorrectly assess environmental data related to a particular company.

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

ESG investing risk. Incorporating ESG criteria and investing primarily in instruments that have certain ESG characteristics, as determined by the manager, carries the risk that the fund may perform differently, including underperforming, funds that do not utilize an ESG investment strategy, or funds that utilize different ESG criteria.

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. The risks of investing in foreign securities are magnified in emerging markets. If applicable, 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.

Geographic focus risk. The fund’s performance will be closely tied to the market, currency, economic, political, regulatory, geopolitical, and other conditions in the countries or regions in which the fund’s assets are invested and may be more volatile than the performance of more geographically-diversified funds.

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.

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.

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.

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.

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. The industrials sector may be affected by general economic conditions, commodity production and pricing, supply and demand fluctuations, environmental and other government regulations, and technological developments, among other factors.

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

This section normally shows how the fund’s total return has varied from year to year, along with a broad-based market index for reference. Performance information is not shown because the fund had been in operation for less than a full calendar year as of the date of this prospectus.

(John Hancock Global Environmental Opportunities Fund - Classes A, C, I and R6) | (Global Environmental Opportunities Fund) | Class A

rr_ProspectusTable

rr_MaximumCumulativeSalesChargeOverOther

5.00%

rr_MaximumDeferredSalesChargeOverOther

1.00%

rr_ShareholderFeeOther

$ 20

rr_ManagementFeesOverAssets

0.82%

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.61%

^[1]

rr_ExpensesOverAssets

1.68%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.48%)

^[2]

rr_NetExpensesOverAssets

1.20%

rr_ExpenseExampleYear01

$ 616

(John Hancock Global Environmental Opportunities Fund - Classes A, C, I and R6) | (Global Environmental Opportunities Fund) | Class C

rr_ExpenseExampleYear03

$ 959

rr_ProspectusTable

rr_MaximumCumulativeSalesChargeOverOther

none

rr_MaximumDeferredSalesChargeOverOther

1.00%

rr_ShareholderFeeOther

$ 20

rr_ManagementFeesOverAssets

0.82%

rr_DistributionAndService12b1FeesOverAssets

1.00%

rr_OtherExpensesOverAssets

0.61%

^[1]

rr_ExpensesOverAssets

2.43%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.48%)

^[2]

rr_NetExpensesOverAssets

1.95%

rr_ExpenseExampleYear01

$ 298

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleYear03

712

rr_ExpenseExampleNoRedemptionYear01

198

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

$ 712

(John Hancock Global Environmental Opportunities Fund - Classes A, C, I and R6) | (Global Environmental Opportunities Fund) | Class I

rr_ProspectusTable

rr_MaximumCumulativeSalesChargeOverOther

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_ShareholderFeeOther

none

rr_ManagementFeesOverAssets

0.82%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.61%

^[1]

rr_ExpensesOverAssets

1.43%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.48%)

^[2]

rr_NetExpensesOverAssets

0.95%

rr_ExpenseExampleYear01

$ 97

(John Hancock Global Environmental Opportunities Fund - Classes A, C, I and R6) | (Global Environmental Opportunities Fund) | Class R6

rr_ExpenseExampleYear03

$ 405

rr_ProspectusTable

rr_MaximumCumulativeSalesChargeOverOther

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_ShareholderFeeOther

none

rr_ManagementFeesOverAssets

0.82%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.51%

^[1]

rr_ExpensesOverAssets

1.33%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.48%)

^[2]

rr_NetExpensesOverAssets

0.85%

rr_ExpenseExampleYear01

$ 87