Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	497
Document Period End Date	dei_DocumentPeriodEndDate	Dec. 31, 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	Jul. 26, 2018
Document Effective Date	dei_DocumentEffectiveDate	Aug. 01, 2018
Prospectus Date	rr_ProspectusDate	Jun. 01, 2018
Putnam Short Duration Bond Fund
Risk/Return:	rr_RiskReturnAbstract
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 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. Your actual costs may be higher or lower.
Putnam Short Duration Bond Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Management fees	rr_ManagementFeesOverAssets	0.37%	[1]
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.63%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 288
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	422
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	568
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 994
Putnam Short Duration Bond Fund | Class B
Risk/Return:	rr_RiskReturnAbstract
Management fees	rr_ManagementFeesOverAssets	0.37%	[1]
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.45%
Other expenses	rr_OtherExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.83%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 185
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	265
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	460
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	968
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	85
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	265
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	460
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 968
Putnam Short Duration Bond Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Management fees	rr_ManagementFeesOverAssets	0.37%	[1]
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.38%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 240
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	437
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	755
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,657
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	140
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	437
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	755
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,657
Putnam Short Duration Bond Fund | Class M
Risk/Return:	rr_RiskReturnAbstract
Management fees	rr_ManagementFeesOverAssets	0.37%	[1]
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Other expenses	rr_OtherExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.68%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 144
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	291
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	451
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 915
Putnam Short Duration Bond Fund | Class R
Risk/Return:	rr_RiskReturnAbstract
Management fees	rr_ManagementFeesOverAssets	0.37%	[1]
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.88%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 90
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	281
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	488
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 1,084
Putnam Short Duration Bond Fund | Class R6
Risk/Return:	rr_RiskReturnAbstract
Management fees	rr_ManagementFeesOverAssets	0.37%	[1]
Other expenses	rr_OtherExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.38%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 39
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	122
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	213
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 480
Putnam Short Duration Bond Fund | Class T
Risk/Return:	rr_RiskReturnAbstract
Management fees	rr_ManagementFeesOverAssets	0.37%	[1]
Distribution and service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.01%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.63%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 64
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	202
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	351
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 786
Putnam Short Duration Bond Fund | Class Y
Risk/Return:	rr_RiskReturnAbstract
Management fees	rr_ManagementFeesOverAssets	0.37%	[1]
Other expenses	rr_OtherExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.38%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 39
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	122
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	213
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 480

[1] Restated to reflect current fees.

[2] Other expenses are based on expenses of class A shares for the fund's last fiscal year.