Objective, Primary [Text Block]

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Objective [Heading]

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Investment objective

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To seek total return from capital appreciation and income, with an emphasis on absolute returns over a full market cycle.

Expense [Heading]

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Fees and expenses

Expense Narrative [Text Block]

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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 27 to 29 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]

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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]

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$ 50,000

Shareholder Fees Caption [Text]

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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

Expense Example [Heading]

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Expense example

Expense Example Narrative [Text Block]

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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]

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Sold

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

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Not Sold

Portfolio Turnover [Heading]

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Portfolio turnover

Portfolio Turnover [Text Block]

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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 27% of the average value of its portfolio.

Portfolio Turnover, Rate

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27.00%

Strategy [Heading]

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Principal investment strategies

Strategy Narrative [Text Block]

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The fund pursues its objective by investing, under normal circumstances, at least 80% of its net assets (plus borrowings for investment purposes) in global securities of companies with infrastructure-related assets. Because the fund normally invests more than 25% of its assets in global securities of infrastructure-related assets, the fund is considered to be “concentrated” in industries represented by infrastructure companies. For purposes of this policy, global securities include: common stock, depositary receipts, real estate securities (including real estate investment trusts (REITs)), master limited partnerships (MLPs) (up to a maximum of 25% of the fund’s net assets), preferred stock, rights, warrants, exchange-traded funds (ETFs), and debt securities (up to a maximum of 20% of the fund’s net assets). Also for purposes of this policy, infrastructure-related assets are long-lived physical assets that are held by companies, including financial holding companies, that engage in the ownership, management, construction, development, renovation, operation, use or financing of infrastructure assets, or that provide the services and raw materials necessary for the construction and maintenance of infrastructure assets. Infrastructure assets are the physical structures, networks and systems which provide necessary services for the function, growth and development of society, including but not limited to utilities, pipelines, toll roads, airports, railroads, ports, telecommunications and other infrastructure companies.

Companies with long-lived physical assets are those that the manager believes possess an advantageous competitive position due to factors such as a long track record, resilience in the face of technological advances, rising replacement costs, and limited substitution risk. The manager believes investment in these types of companies can contribute to attractive, long-term absolute returns. The fund also seeks to mitigate losses during periods of unfavorable equity market conditions by attempting to limit volatility relative to the wider market. While not managed explicitly for yield, the securities in which the fund invests may often provide higher dividend yields than the broader equity market. The fund is not managed to track a benchmark index.

The fund may invest in debt securities, including convertible bonds, without any maturity limit and of any credit quality, including high-yield securities (i.e., junk bonds). The fund may also invest in cash, cash equivalents, and derivative instruments. Derivatives may be used to reduce risk, obtain efficient market exposure, and/or enhance investment returns, and may include swaps, forward contracts, options, currency derivatives (including currency forwards, futures, options, and spot transactions), and similar instruments or combinations thereof. Country and regional weights are driven by bottom-up security selection and are typically unconstrained; however, the fund will generally be diversified regionally across global equity markets, including emerging markets. The fund invests in companies across the market-capitalization spectrum.

The fund seeks to outperform global equity markets during periods of flat or negative market performance and may underperform during periods of strong market performance. The fund’s investment returns may be volatile over short periods of time and returns over any period of time may not be positive. The maximum position in any individual security will typically be less than 10% of the fund’s net assets. Generally, less than 10% of the fund’s net assets will be invested in cash and cash equivalents, but can be as high as 20%.

Strategy Portfolio Concentration [Text]

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Risk [Heading]

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Principal risks

Risk Narrative [Text Block]

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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 7 of the prospectus.

Commodity risk. Commodity prices may be volatile due to fluctuating demand, supply disruption, speculation, and other factors. Certain commodity investments may have no active trading market at times.

Concentration risk. Because the fund may focus on one or more industries or sectors of the economy, its performance depends in large part on the performance of those industries or sectors. As a result, the value of an investment may fluctuate more widely since it is more susceptible to market, economic, political, regulatory, and other conditions and risks affecting those industries or sectors than a fund that invests more broadly across industries and sectors.

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.

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 (ETFs) risk. The risks of owning shares of an ETF include the risks of owning the underlying securities the ETF holds. Lack of liquidity in an ETF could result in the ETF being more volatile than its underlying securities. An ETF’s shares could trade at a significant premium or discount to its net asset value (NAV). A fund bears ETF fees and expenses indirectly.

Financial services sector risk. Financial services companies can be significantly affected by economic, market, and business developments, borrowing costs, interest-rate fluctuations, competition, and government regulation, among other factors.

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.

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.

Greater China risk. Investments in the Greater China region may be subject to less developed trading markets, acute political risks such as possible negative repercussions resulting from China’s relationship with Taiwan or Hong Kong, and restrictions on monetary repatriation or other adverse government actions. For example, a government may restrict investment in companies or industries considered important to national interests, or intervene in the financial markets, such as by imposing trading restrictions, or banning or curtailing short selling. A small number of companies and industries may generally represent a relatively large portion of the Greater China market as a whole.

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, options, and swaps. Foreign currency forward contracts, futures contracts, options, and swaps generally are subject to counterparty risk. In addition, swaps may be subject to interest-rate and settlement risk, and the risk of default of the underlying reference obligation. Derivatives associated with foreign currency transactions are subject to currency risk.

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. 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.

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.

Master limited partnership (MLP) risk. MLPs generally reflect the risks associated with their underlying assets and with pooled investment vehicles. MLPs with credit-related holdings are subject to interest-rate risk and risk of default.

Midstream energy infrastructure sector risk. Midstream energy infrastructure companies, such as companies that provide crude oil, refined product, and natural gas services, are subject to supply-and-demand fluctuations in the markets they serve, which may be impacted by a wide range of factors.

Natural resources industry risk. The natural resources industry can be significantly affected by international political and economic developments, energy conservation and exploration efforts, natural disasters or other extreme weather conditions, commodity prices, and taxes and other governmental regulations, among other factors.

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.

Real estate investment trust (REIT) 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.

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.

Telecommunications sector risk. Telecommunication services companies are subject to government regulation of services and rates of return and can be significantly affected by intense competition, among other factors.

Transportation sector risk. Transportation companies can be significantly affected by economic changes, fuel, maintenance, and insurance costs, labor relations, and government regulation, among other factors.

Utilities sector risk. Utilities companies’ performance may be volatile due to variable fuel, service, and financing costs, conservation efforts, government regulation, and other factors.

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]

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Many factors affect performance, and fund shares will fluctuate in price, meaning you could lose money.

Risk Not Insured Depository Institution [Text]

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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]

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Past performance

Performance Narrative [Text Block]

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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 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 (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 and Class R6) between 8:30 A.M. and 5:00 P.M., Eastern time, on most business days.

A note on performance

Class A and Class C shares commenced operations on December 20, 2013 and May 16, 2014, respectively. Returns shown prior to Class C shares’ commencement date are those of Class A shares, except that they do not include Class A sales charges and would be lower if they did. Returns for Class C shares would have been substantially similar to returns of Class A 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. To the extent expenses of a class would have been higher than expenses of Class A shares for the periods shown, performance would have been lower.

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.

Performance Information Illustrates Variability of Returns [Text]

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Performance Availability Phone [Text]

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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 and Class R6) between 8:30 A.M. and 5:00 P.M., Eastern time, on most business days.

Performance Availability Website Address [Text]

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jhinvestments.com

Performance Past Does Not Indicate Future [Text]

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Past performance (before and after taxes) does not indicate future results.

Bar Chart [Heading]

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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]

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sales charges are not reflected in the bar chart and returns would have been lower if they were

Performance Table Uses Highest Federal Rate

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Performance Table Not Relevant to Tax Deferred

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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 Table One Class of after Tax Shown [Text]

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Please note that after-tax returns (shown for Class A shares only)

Bar Chart Closing [Text Block]

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Best quarter: 2020, Q4, 11.54%
Worst quarter: 2020, Q1, -15.84%

Performance Table Heading

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Average annual total returns (%)—as of 12/31/21

(John Hancock Infrastructure Fund - Classes A, C, I and R6) | (Infrastructure Fund) | MSCI ACWI (reflects no deduction for fees, expenses, or taxes)

rr_ProspectusTable

rr_AverageAnnualReturnYear01

18.54%

rr_AverageAnnualReturnYear05

14.40%

(John Hancock Infrastructure Fund - Classes A, C, I and R6) | (Infrastructure Fund) | Class A

rr_AverageAnnualReturnSinceInception

10.33%

rr_ProspectusTable

rr_MaximumCumulativeSalesChargeOverOther

5.00%

rr_MaximumDeferredSalesChargeOverOther

1.00%

rr_ShareholderFeeOther

$ 20

rr_ManagementFeesOverAssets

0.77%

rr_DistributionAndService12b1FeesOverAssets

0.30%

rr_OtherExpensesOverAssets

0.22%

rr_ExpensesOverAssets

1.29%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[1]

rr_NetExpensesOverAssets

1.28%

rr_ExpenseExampleYear01

$ 624

rr_ExpenseExampleYear03

888

rr_ExpenseExampleYear05

1,171

Highest Quarterly Return, Label

rr_ExpenseExampleYear10

$ 1,978

Annual Return 2014

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7.74%

Annual Return 2015

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(3.68%)

Annual Return 2016

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4.27%

Annual Return 2017

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17.08%

Annual Return 2018

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(1.71%)

Annual Return 2019

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23.08%

Annual Return 2020

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2.21%

Annual Return 2021

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13.67%

rr_HighestQuarterlyReturnLabel

Best quarter: 2020, Q4, 11.54%

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

11.54%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2020

Lowest Quarterly Return, Label

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Worst quarter: 2020, Q1, -15.84%

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(15.84%)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2020

rr_AverageAnnualReturnYear01

8.01%

rr_AverageAnnualReturnYear05

9.35%

(John Hancock Infrastructure Fund - Classes A, C, I and R6) | (Infrastructure Fund) | Class A | after tax on distributions

rr_AverageAnnualReturnSinceInception

6.98%

rr_ProspectusTable

rr_AverageAnnualReturnYear01

6.42%

rr_AverageAnnualReturnYear05

8.43%

(John Hancock Infrastructure Fund - Classes A, C, I and R6) | (Infrastructure Fund) | Class A | after tax on distributions, with sale

rr_AverageAnnualReturnSinceInception

6.30%

rr_ProspectusTable

rr_AverageAnnualReturnYear01

9.23%

rr_AverageAnnualReturnYear05

8.25%

(John Hancock Infrastructure Fund - Classes A, C, I and R6) | (Infrastructure Fund) | Class C

rr_AverageAnnualReturnSinceInception

6.11%

rr_ProspectusTable

rr_MaximumCumulativeSalesChargeOverOther

none

rr_MaximumDeferredSalesChargeOverOther

1.00%

rr_ShareholderFeeOther

$ 20

rr_ManagementFeesOverAssets

0.77%

rr_DistributionAndService12b1FeesOverAssets

1.00%

rr_OtherExpensesOverAssets

0.22%

rr_ExpensesOverAssets

1.99%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[1]

rr_NetExpensesOverAssets

1.98%

rr_ExpenseExampleYear01

$ 301

rr_ExpenseExampleYear03

623

rr_ExpenseExampleYear05

1,072

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleYear10

2,135

rr_ExpenseExampleNoRedemptionYear01

201

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

623

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,072

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,135

rr_AverageAnnualReturnYear01

11.91%

rr_AverageAnnualReturnYear05

9.71%

(John Hancock Infrastructure Fund - Classes A, C, I and R6) | (Infrastructure Fund) | Class I

rr_AverageAnnualReturnSinceInception

6.95%

rr_ProspectusTable

rr_MaximumCumulativeSalesChargeOverOther

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_ShareholderFeeOther

none

rr_ManagementFeesOverAssets

0.77%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.22%

rr_ExpensesOverAssets

0.99%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[1]

rr_NetExpensesOverAssets

0.98%

rr_ExpenseExampleYear01

$ 100

rr_ExpenseExampleYear03

314

rr_ExpenseExampleYear05

546

rr_ExpenseExampleYear10

$ 1,212

rr_AverageAnnualReturnYear01

14.01%

rr_AverageAnnualReturnYear05

10.81%

(John Hancock Infrastructure Fund - Classes A, C, I and R6) | (Infrastructure Fund) | Class R6

rr_AverageAnnualReturnSinceInception

7.98%

rr_ProspectusTable

rr_MaximumCumulativeSalesChargeOverOther

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_ShareholderFeeOther

none

rr_ManagementFeesOverAssets

0.77%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.11%

rr_ExpensesOverAssets

0.88%

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[1]

rr_NetExpensesOverAssets

0.87%

rr_ExpenseExampleYear01

$ 89

rr_ExpenseExampleYear03

280

rr_ExpenseExampleYear05

487

rr_ExpenseExampleYear10

$ 1,083

rr_AverageAnnualReturnYear01

14.17%

rr_AverageAnnualReturnYear05

10.93%