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Risk/Return:rr_RiskReturnAbstract 
Document Typedei_DocumentType485BPOS
Document Period End Datedei_DocumentPeriodEndDateSep. 30, 2011
Registrant Namedei_EntityRegistrantNamePUTNAM FUNDS TRUST
Central Index Keydei_EntityCentralIndexKey0001005942
Amendment Flagdei_AmendmentFlagfalse
Document Creation Datedei_DocumentCreationDateSep. 30, 2011
Document Effective Datedei_DocumentEffectiveDateOct. 10, 2011
Prospectus Daterr_ProspectusDateOct. 10, 2011
Putnam Multi-Market Short Duration Fund
 
Risk/Return:rr_RiskReturnAbstract 
Risk/Return [Heading]rr_RiskReturnHeadingFund summary
Objective [Heading]rr_ObjectiveHeadingGoal
Objective, Primary [Text Block]rr_ObjectivePrimaryTextBlockPutnam Short Duration Income Fund seeks as high a rate of current income as we believe is consistent with preservation of capital and maintenance of liquidity.
Fees and expensespft1005942_FundFeesAndExpensesAbstract 
Expense [Heading]rr_ExpenseHeadingFees and expenses
Expense Narrative [Text Block]rr_ExpenseNarrativeTextBlockThe following table describes the fees and expenses you may pay if you buy and hold shares of the fund.
Shareholder feesrr_ShareholderFeesAbstract 
Shareholder Fees Caption [Text]rr_ShareholderFeesCaptionShareholder fees (fees paid directly from your investment)
Expenses Deferred Charges [Text Block]rr_ExpensesDeferredChargesTextBlockA deferred sales charge on class A, B and C shares may be imposed on certain redemptions of shares purchased by exchange from another Putnam fund. A deferred sales charge on class M shares may apply on redemptions by certain rollover accounts.
Annual fund operating expensesrr_OperatingExpensesAbstract 
Operating Expenses Caption [Text]rr_OperatingExpensesCaptionAnnual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Other Expenses, New Fund, Based on Estimates [Text]rr_OtherExpensesNewFundBasedOnEstimatesOther expenses are based on estimated amounts for the current fiscal year.
Fee Waiver or Reimbursement over Assets, Date of Terminationrr_FeeWaiverOrReimbursementOverAssetsDateOfTerminationOctober 30, 2012
Expense Examplerr_ExpenseExampleAbstract 
Expense Example [Heading]rr_ExpenseExampleHeadingExample
Expense Example Narrative [Text Block]rr_ExpenseExampleNarrativeTextBlockThe following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then redeem or hold all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Only the first year of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.
Portfolio Turnoverpft1005942_PortfolioTurnoverAltAbstract 
Portfolio Turnover [Heading]rr_PortfolioTurnoverHeadingPortfolio turnover
Portfolio Turnover [Text Block]rr_PortfolioTurnoverTextBlockThe fund pays transaction-related costs when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s portfolio turnover rate will be available after the fund completes its first fiscal year.
Strategy [Heading]rr_StrategyHeadingInvestments
Strategy Narrative [Text Block]rr_StrategyNarrativeTextBlock

The fund invests in a diversified portfolio of fixed income securities comprised of short duration, investment grade money market and other fixed income securities. The fund’s investments may include obligations of the U.S. government, its agencies and instrumentalities, which are backed by the full faith and credit of the United States (e.g., U.S. Treasury bonds and Ginnie Mae mortgage-backed bonds) or only by the credit of a federal agency or government sponsored entity (e.g., Fannie Mae or Freddie Mac mortgage-backed bonds), domestic corporate debt obligations, taxable municipal debt securities, securitized debt instruments (such as mortgage- and asset-backed securities), repurchase agreements, certificates of deposit, bankers acceptances, commercial paper (including asset-backed commercial paper), time deposits, Yankee Eurodollar securities and money market instruments. We may also invest in U.S. –dollar denominated foreign securities of these types. Under normal circumstances, the effective duration of the fund’s portfolio will generally not be greater than one year. Effective duration provides a measure of a fund's interest-rate sensitivity. The longer a fund's duration, the more sensitive the fund is to shifts in interest rates. Under normal circumstances, the dollar-weighted average portfolio maturity of the fund is not expected to exceed three and one-half years.

We may consider, among other factors, credit, interest rate and prepayment risks, as well as general market conditions, when deciding whether to buy or sell investments. We may use derivatives, such as futures, options and swap contracts, for both hedging and non-hedging purposes.

Strategy Portfolio Concentration [Text]rr_StrategyPortfolioConcentrationThe fund invests in a diversified portfolio of fixed income securities comprised of short duration, investment grade money market and other fixed income securities.
Risk [Heading]rr_RiskHeadingRisks
Risk Narrative [Text Block]rr_RiskNarrativeTextBlock

It is important to understand that you can lose money by investing in the fund.

The effects of inflation may erode the value of your investment over time. The prices of securities in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including both general financial market conditions and factors related to a specific issuer or industry. The risks associated with fixed income investments include interest rate risk, which means the prices of the fund’s investments are likely to fall if interest rates rise. Fixed income investments also are subject to credit risk, which is the risk that the issuers of the fund’s investments may default on payment of interest or principal. Credit risk is generally greater for debt not backed by the full faith and credit of the U.S. government, and interest rate risk is generally greater for longer-term debt. Mortgage-backed investments carry the risk that they may increase in value less when interest rates decline and decline in value more when interest rates rise. We may have to invest the proceeds from prepaid investments, including mortgage-and asset-backed investments, in other investments with less attractive terms and yields. Our use of derivatives may increase these risks by increasing investment exposure (which may be considered leverage) or, in the case of many over-the-counter instruments, because of the potential inability to terminate or sell derivatives positions and the potential failure of the other party to the instrument to meet its obligations.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]rr_RiskLoseMoneyIt is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text]rr_RiskNotInsuredDepositoryInstitutionAn investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Performancepft1005942_FundPastPerformanceAbstract 
Bar Chart and Performance Table [Heading]rr_BarChartAndPerformanceTableHeadingPerformance
Performance Narrative [Text Block]rr_PerformanceNarrativeTextBlockPerformance information will be available after the fund completes a full calendar year of operation.
Performance One Year or Less [Text]rr_PerformanceOneYearOrLessPerformance information will be available after the fund completes a full calendar year of operation.
Putnam Multi-Market Short Duration Fund | Class A
 
Shareholder feesrr_ShareholderFeesAbstract 
Share classrr_ShareholderFeesColumnNameClass A
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)rr_MaximumDeferredSalesChargeOverOther1.00%[1]
Annual fund operating expensesrr_OperatingExpensesAbstract 
Share classrr_OperatingExpensesColumnNameClass A
Management feesrr_ManagementFeesOverAssets0.35%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets0.10%
Other expensesrr_OtherExpensesOverAssets0.62%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.07%
Expense reimbursementrr_FeeWaiverOrReimbursementOverAssets(0.67%)[3]
Total annual fund operating expenses after expense reimbursementrr_NetExpensesOverAssets0.40%
Expense Examplerr_ExpenseExampleAbstract 
Share classrr_ExpenseExampleByYearColumnNameClass A
1 yearrr_ExpenseExampleYear01 41
3 yearsrr_ExpenseExampleYear03220
Putnam Multi-Market Short Duration Fund | Class B
 
Shareholder feesrr_ShareholderFeesAbstract 
Share classrr_ShareholderFeesColumnNameClass B
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)rr_MaximumDeferredSalesChargeOverOther5.00%[1]
Annual fund operating expensesrr_OperatingExpensesAbstract 
Share classrr_OperatingExpensesColumnNameClass B
Management feesrr_ManagementFeesOverAssets0.35%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets0.50%
Other expensesrr_OtherExpensesOverAssets0.62%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.47%
Expense reimbursementrr_FeeWaiverOrReimbursementOverAssets(0.67%)[3]
Total annual fund operating expenses after expense reimbursementrr_NetExpensesOverAssets0.80%
Expense Examplerr_ExpenseExampleAbstract 
Share classrr_ExpenseExampleByYearColumnNameClass B
1 yearrr_ExpenseExampleYear0182
3 yearsrr_ExpenseExampleYear03346
Putnam Multi-Market Short Duration Fund | Class C
 
Shareholder feesrr_ShareholderFeesAbstract 
Share classrr_ShareholderFeesColumnNameClass C
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)rr_MaximumDeferredSalesChargeOverOther1.00%[1]
Annual fund operating expensesrr_OperatingExpensesAbstract 
Share classrr_OperatingExpensesColumnNameClass C
Management feesrr_ManagementFeesOverAssets0.35%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets0.50%
Other expensesrr_OtherExpensesOverAssets0.62%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.47%
Expense reimbursementrr_FeeWaiverOrReimbursementOverAssets(0.67%)[3]
Total annual fund operating expenses after expense reimbursementrr_NetExpensesOverAssets0.80%
Expense Examplerr_ExpenseExampleAbstract 
Share classrr_ExpenseExampleByYearColumnNameClass C
1 yearrr_ExpenseExampleYear0182
3 yearsrr_ExpenseExampleYear03346
Putnam Multi-Market Short Duration Fund | Class M
 
Shareholder feesrr_ShareholderFeesAbstract 
Share classrr_ShareholderFeesColumnNameClass M
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)rr_MaximumDeferredSalesChargeOverOther0.15%[1]
Annual fund operating expensesrr_OperatingExpensesAbstract 
Share classrr_OperatingExpensesColumnNameClass M
Management feesrr_ManagementFeesOverAssets0.35%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets0.15%
Other expensesrr_OtherExpensesOverAssets0.62%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.12%
Expense reimbursementrr_FeeWaiverOrReimbursementOverAssets(0.67%)[3]
Total annual fund operating expenses after expense reimbursementrr_NetExpensesOverAssets0.45%
Expense Examplerr_ExpenseExampleAbstract 
Share classrr_ExpenseExampleByYearColumnNameClass M
1 yearrr_ExpenseExampleYear0146
3 yearsrr_ExpenseExampleYear03236
Putnam Multi-Market Short Duration Fund | Class R
 
Shareholder feesrr_ShareholderFeesAbstract 
Share classrr_ShareholderFeesColumnNameClass R
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)rr_MaximumDeferredSalesChargeOverOther none
Annual fund operating expensesrr_OperatingExpensesAbstract 
Share classrr_OperatingExpensesColumnNameClass R
Management feesrr_ManagementFeesOverAssets0.35%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets0.50%
Other expensesrr_OtherExpensesOverAssets0.62%[2]
Total annual fund operating expensesrr_ExpensesOverAssets1.47%
Expense reimbursementrr_FeeWaiverOrReimbursementOverAssets(0.67%)[3]
Total annual fund operating expenses after expense reimbursementrr_NetExpensesOverAssets0.80%
Expense Examplerr_ExpenseExampleAbstract 
Share classrr_ExpenseExampleByYearColumnNameClass R
1 yearrr_ExpenseExampleYear0182
3 yearsrr_ExpenseExampleYear03346
Putnam Multi-Market Short Duration Fund | Class Y
 
Shareholder feesrr_ShareholderFeesAbstract 
Share classrr_ShareholderFeesColumnNameClass Y
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)rr_MaximumDeferredSalesChargeOverOther none
Annual fund operating expensesrr_OperatingExpensesAbstract 
Share classrr_OperatingExpensesColumnNameClass Y
Management feesrr_ManagementFeesOverAssets0.35%
Distribution and service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets 
Other expensesrr_OtherExpensesOverAssets0.62%[2]
Total annual fund operating expensesrr_ExpensesOverAssets0.97%
Expense reimbursementrr_FeeWaiverOrReimbursementOverAssets(0.67%)[3]
Total annual fund operating expenses after expense reimbursementrr_NetExpensesOverAssets0.30%
Expense Examplerr_ExpenseExampleAbstract 
Share classrr_ExpenseExampleByYearColumnNameClass Y
1 yearrr_ExpenseExampleYear0131
3 yearsrr_ExpenseExampleYear03 188
[1]A deferred sales charge on class A, B and C shares may be imposed on certain redemptions of shares purchased by exchange from another Putnam fund. A deferred sales charge on class M shares may apply on redemptions by certain rollover accounts.
[2]Other expenses are based on estimated amounts for the current fiscal year.
[3]Reflects Putnam Investment Management, LLC's contractual obligation to limit certain fund expenses through at least October 30, 2012. This obligation may be modified or discontinued only with approval of the Board of Trustees.