Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	497
Document Period End Date	dei_DocumentPeriodEndDate	Mar. 29, 2017
Registrant Name	dei_EntityRegistrantName	PUTNAM FUNDS TRUST
Central Index Key	dei_EntityCentralIndexKey	0001005942
Amendment Flag	dei_AmendmentFlag	false
Trading Symbol	dei_TradingSymbol	PFT
Document Creation Date	dei_DocumentCreationDate	Mar. 30, 2017
Document Effective Date	dei_DocumentEffectiveDate	Apr. 01, 2017
Prospectus Date	rr_ProspectusDate	Nov. 30, 2016
Putnam Low Volatility Equity Fund
Risk/Return:	rr_RiskReturnAbstract
Expense [Heading]	rr_ExpenseHeading	Fees and expenses
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The following 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 if you and your family invest, or agree to invest in the future, at least $50,000 in Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 18 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Fees and expenses
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Putnam funds. More information about these and other discounts is available from your financial advisor and in How do I buy fund shares? beginning on page 18 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Restated to reflect current fees resulting from a change to the fund's investor servicing arrangements effective September 1, 2016.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The 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, except as indicated, redeem 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.
Putnam Low Volatility Equity Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.62%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.45%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.32%
Expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.12%)	[2]
Total annual fund operating expenses after expense reimbursement	rr_NetExpensesOverAssets	1.20%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 690
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	959
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,247
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 2,066
Putnam Low Volatility Equity Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
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	5.00%	[3]
Management fees	rr_ManagementFeesOverAssets	0.62%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.45%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.07%
Expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.12%)	[2]
Total annual fund operating expenses after expense reimbursement	rr_NetExpensesOverAssets	1.95%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 698
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	938
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,304
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,200
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	198
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	638
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,104
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,200
Putnam Low Volatility Equity Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
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	1.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.62%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.45%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.07%
Expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.12%)	[2]
Total annual fund operating expenses after expense reimbursement	rr_NetExpensesOverAssets	1.95%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 298
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	638
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,104
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,393
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	198
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	638
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,104
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,393
Putnam Low Volatility Equity Fund | Class M
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.50%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.62%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other expenses	rr_OtherExpensesOverAssets	0.45%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.82%
Expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.12%)	[2]
Total annual fund operating expenses after expense reimbursement	rr_NetExpensesOverAssets	1.70%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 517
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	892
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,291
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 2,405
Putnam Low Volatility Equity Fund | Class T
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	2.50%
Maximum deferred sales charge (load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.62%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.45%	[5]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.32%
Expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.12%)	[2]
Total annual fund operating expenses after expense reimbursement	rr_NetExpensesOverAssets	1.20%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 369
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	647
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	945
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,792
Putnam Low Volatility Equity Fund | Class Y
Risk/Return:	rr_RiskReturnAbstract
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
Management fees	rr_ManagementFeesOverAssets	0.62%
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.45%	[6]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.07%
Expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.12%)	[2]
Total annual fund operating expenses after expense reimbursement	rr_NetExpensesOverAssets	0.95%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 97
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	329
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	580
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,297

[1] Applies only to certain redemptions of shares bought with no initial sales charge.

[2] Reflects Putnam Investment Management, LLC's contractual obligation to limit certain fund expenses through November 30, 2017. This obligation may be modified or discontinued only with approval of the Board of Trustees.

[3] This charge is phased out over six years.

[4] This charge is eliminated after one year.

[5] Other expenses are based on expenses of class A shares for the fund's last fiscal year, as restated to reflect current fees resulting from a change to the fund's investor servicing arrangements effective September 1, 2016.

[6] Restated to reflect current fees resulting from a change to the fund's investor servicing arrangements effective September 1, 2016