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(John Hancock Short Duration Bond Fund - Classes A, C, I and R6) | (John Hancock Short Duration Bond Fund)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
To seek a high level of current income consistent with prudent investment risk.
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 $100,000 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). Although the fund does not impose any sales charges on Class I shares, you may pay commissions to your broker on your purchases and sales of Class I shares, which are not reflected in the table and example below. More information about these and other discounts is available from your financial representative and on pages 15 to 17 of the prospectus under "Sales charge reductions and waivers" or pages 89 to 93 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 $100,000 in the John Hancock family of funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
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, 2021
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. Because the fund had not commenced operations as of the date of the fund's prospectus, there is no portfolio turnover to report.
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 a diversified portfolio of bonds. These may include, but are not limited to, corporate bonds and debentures, mortgage-backed and asset-backed securities, and U.S. government and agency securities. The fund will invest at least 65% of its net assets in investment-grade debt securities and cash and cash equivalents. The fund may invest up to 35% of its net assets in below-investment-grade debt securities (junk bonds) rated as low as CC by Standard & Poor's Ratings Services (S&P), Ca by Moody's Investors Service, Inc. (Moody's), and C by Fitch Ratings (Fitch), or their unrated equivalents. The fund does not invest in securities rated below these ratings or their unrated equivalents. The fund's investment policies are based on credit ratings at the time of purchase. The fund's average effective duration is expected to be less than 3 years. There is no limit on average maturity.
The manager focuses on sector allocation, industry allocation, and security selection in making investment decisions. The manager uses bottom-up research to find individual securities that appear comparatively undervalued. The fund may invest up to 35% of its net assets in securities of issuers domiciled outside of the United States, including depositary receipts. The fund's assets will be U.S. dollar-denominated.
The fund may engage in derivative transactions. Derivatives may be used to reduce risk, obtain efficient market exposure, and/or enhance investment returns, and may include futures contracts on securities and indexes; options on futures contracts, securities, and indexes; and interest-rate and credit default swaps. The fund's investments in U.S. government and agency securities may or may not be supported by the full faith and credit of the United States.
Under normal circumstances, the fund may not invest more than 10% of its net assets in cash or cash equivalents (except cash segregated in relation to derivative transactions). The fund may trade securities actively.
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.
Changing distribution levels risk. The fund may cease or reduce the level of its distribution if income or dividends paid from its investments declines.
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. U.S. government securities are subject to varying degrees of credit risk depending upon the nature of their support. A downgrade or default affecting any of the fund's securities could affect the fund's performance.
Cybersecurity and operational 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.
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.
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. 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. 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). Regulatory changes in derivative markets could impact the cost of or the fund's ability to engage in derivative transactions. Derivatives and other strategic transactions that the fund intends to utilize include: credit default swaps, futures contracts, interest-rate swaps, and options. 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.
High portfolio turnover risk. Trading securities actively and frequently can increase transaction costs (thus lowering performance) and taxable distributions.
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.
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.
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.
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 returns have varied from year to year, along with a broad-based market index for reference. Because the fund had not commenced operations as of the date of this prospectus, there is no past performance to report.
(John Hancock Short Duration Bond Fund - Classes A, C, I and R6) | (John Hancock Short Duration Bond Fund) | Class A  
Prospectus: rr_ProspectusTable  
Maximum Cumulative Sales Charge over Other rr_MaximumCumulativeSalesChargeOverOther 2.25%
Maximum Deferred Sales Charge Over Other rr_MaximumDeferredSalesChargeOverOther 0.50% [1]
Small account fee (for fund account balances under $1,000) ($) rr_ShareholderFeeOther $ 20
Management fee rr_ManagementFeesOverAssets 0.22%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.30% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.77%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [3]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 290
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 454
(John Hancock Short Duration Bond Fund - Classes A, C, I and R6) | (John Hancock Short Duration Bond Fund) | Class C  
Prospectus: rr_ProspectusTable  
Maximum Cumulative Sales Charge over Other rr_MaximumCumulativeSalesChargeOverOther none
Maximum Deferred Sales Charge Over Other rr_MaximumDeferredSalesChargeOverOther 1.00%
Small account fee (for fund account balances under $1,000) ($) rr_ShareholderFeeOther $ 20
Management fee rr_ManagementFeesOverAssets 0.22%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.30% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.52%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [3]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 1.40%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 243
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 469
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 143
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 818
(John Hancock Short Duration Bond Fund - Classes A, C, I and R6) | (John Hancock Short Duration Bond Fund) | Class I  
Prospectus: rr_ProspectusTable  
Maximum Cumulative Sales Charge over Other rr_MaximumCumulativeSalesChargeOverOther none
Maximum Deferred Sales Charge Over Other rr_MaximumDeferredSalesChargeOverOther none
Small account fee (for fund account balances under $1,000) ($) rr_ShareholderFeeOther none
Management fee rr_ManagementFeesOverAssets 0.22%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.30% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.52%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [3]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.40%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 41
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 155
(John Hancock Short Duration Bond Fund - Classes A, C, I and R6) | (John Hancock Short Duration Bond Fund) | Class R6  
Prospectus: rr_ProspectusTable  
Maximum Cumulative Sales Charge over Other rr_MaximumCumulativeSalesChargeOverOther none
Maximum Deferred Sales Charge Over Other rr_MaximumDeferredSalesChargeOverOther none
Small account fee (for fund account balances under $1,000) ($) rr_ShareholderFeeOther none
Management fee rr_ManagementFeesOverAssets 0.22%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.19% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.41%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [3]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.29%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 30
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 120
(John Hancock Short Duration Bond Fund - Class NAV) | (John Hancock Short Duration Bond Fund)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
To seek a high level of current income consistent with prudent investment risk.
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.
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, 2021
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 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. Because the fund had not commenced operations as of the date of the fund's prospectus, there is no portfolio turnover to report.
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 a diversified portfolio of bonds. These may include, but are not limited to, corporate bonds and debentures, mortgage-backed and asset-backed securities, and U.S. government and agency securities. The fund will invest at least 65% of its net assets in investment-grade debt securities and cash and cash equivalents. The fund may invest up to 35% of its net assets in below-investment-grade debt securities (junk bonds) rated as low as CC by Standard & Poor's Ratings Services (S&P), Ca by Moody's Investors Service, Inc. (Moody's), and C by Fitch Ratings (Fitch), or their unrated equivalents. The fund does not invest in securities rated below these ratings or their unrated equivalents. The fund's investment policies are based on credit ratings at the time of purchase. The fund's average effective duration is expected to be less than 3 years. There is no limit on average maturity.
The manager focuses on sector allocation, industry allocation, and security selection in making investment decisions. The manager uses bottom-up research to find individual securities that appear comparatively undervalued. The fund may invest up to 35% of its net assets in securities of issuers domiciled outside of the United States, including depositary receipts. The fund's assets will be U.S. dollar-denominated.
The fund may engage in derivative transactions. Derivatives may be used to reduce risk, obtain efficient market exposure, and/or enhance investment returns, and may include futures contracts on securities and indexes; options on futures contracts, securities, and indexes; and interest-rate and credit default swaps. The fund's investments in U.S. government and agency securities may or may not be supported by the full faith and credit of the United States.
Under normal circumstances, the fund may not invest more than 10% of its net assets in cash or cash equivalents (except cash segregated in relation to derivative transactions). The fund may trade securities actively.
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.
Changing distribution levels risk. The fund may cease or reduce the level of its distribution if income or dividends paid from its investments declines.
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. U.S. government securities are subject to varying degrees of credit risk depending upon the nature of their support. A downgrade or default affecting any of the fund's securities could affect the fund's performance.
Cybersecurity and operational 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.
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.
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. 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. 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). Regulatory changes in derivative markets could impact the cost of or the fund's ability to engage in derivative transactions. Derivatives and other strategic transactions that the fund intends to utilize include: credit default swaps, futures contracts, interest-rate swaps, and options. 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.
High portfolio turnover risk. Trading securities actively and frequently can increase transaction costs (thus lowering performance) and taxable distributions.
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.
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.
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.
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 returns have varied from year to year, along with a broad-based market index for reference. Because the fund had not commenced operations as of the date of this prospectus, there is no past performance to report.
(John Hancock Short Duration Bond Fund - Class NAV) | (John Hancock Short Duration Bond Fund) | Class NAV  
Prospectus: rr_ProspectusTable  
Maximum Cumulative Sales Charge over Other rr_MaximumCumulativeSalesChargeOverOther none
Maximum Deferred Sales Charge Over Other rr_MaximumDeferredSalesChargeOverOther none
Management fee rr_ManagementFeesOverAssets 0.22%
Other expenses rr_OtherExpensesOverAssets 0.18% [4]
Total annual fund operating expenses rr_ExpensesOverAssets 0.40%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.11%) [5]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.29%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 30
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 117
[1] (on certain purchases, including those of $250,000 or more)
[2] "Other expenses" have been estimated for the fund's first year of operations.
[3] The advisor contractually agrees to reduce its management fee or, if necessary, make payment to the fund in an amount equal to the amount by which expenses of the fund exceed 0.29% of average daily net assets of the fund and expenses of Class A, Class C, Class I, and Class R6 shares exceed 0.65%, 1.40%, 0.40%, and 0.29%, respectively, of average daily net assets attributable to the class. For purposes of these agreements, "expenses of the fund" means all fund expenses, excluding (a) taxes, (b) brokerage commissions, (c) interest expense, (d) litigation and indemnification expenses and other extraordinary expenses not incurred in the ordinary course of the fund's business, (e) class-specific expenses, (f) borrowing costs, (g) prime brokerage fees, (h) acquired fund fees and expenses paid indirectly, and (i) short dividend expense, and "expenses of Class A, Class C, Class I, and Class R6 shares" means all "expenses of the fund" attributable to the applicable class plus class-specific expenses. Each agreement expires on September 30, 2020, 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. The advisor also 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. This waiver is allocated proportionally among the participating funds. This agreement expires on July 31, 2021, 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.
[4] "Other expenses" have been estimated for the fund's first year of operations.
[5] The advisor contractually agrees to reduce its management fee or, if necessary, make payment to the fund in an amount equal to the amount by which expenses of the fund exceed 0.29% of average daily net assets of the fund. For purposes of this agreement, "expenses of the fund" means all fund expenses, excluding (a) taxes, (b) brokerage commissions, (c) interest expense, (d) litigation and indemnification expenses and other extraordinary expenses not incurred in the ordinary course of the fund's business, (e) class-specific expenses, (f) borrowing costs, (g) prime brokerage fees, (h) acquired fund fees and expenses paid indirectly, and (i) short dividend expense. This agreement expires on September 30, 2020, unless renewed by mutual agreement of the advisor and the fund based upon a determination that this is appropriate under the circumstances at that time. The advisor also 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. This waiver is allocated proportionally among the participating funds. This agreement expires on July 31, 2021, 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.