v3.26.1
Shareholder Report
 6 Months Ended
Jan. 31, 2026
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Putnam Funds Trust
Entity Central Index Key 0001005942
Entity Investment Company Type N-1A
Document Period End Date Jan. 31, 2026
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Class A  
Shareholder Report [Line Items]  
Fund Name Putnam Ultra Short Duration Income Fund
Class Name Class A
Trading Symbol PSDTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Ultra Short Duration Income Fund for the period August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Class A
$21
0.41%
[1],[2]
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.41%
Net Assets $ 12,587,329,162
Holdings Count | $ / shares 593
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Total Net Assets
$12,587,329,162
Total Number of Portfolio Holdings
593
Portfolio Turnover Rate
24%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Portfolio Composition*,† (% of Total Investments)
image
 [3],[4]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name Putnam Ultra Short Duration Income Fund
Class Name Class C
Trading Symbol PSDLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Ultra Short Duration Income Fund for the period August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Class C
$41
0.81%
[5],[6]
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.81%
Net Assets $ 12,587,329,162
Holdings Count | $ / shares 593
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Total Net Assets
$12,587,329,162
Total Number of Portfolio Holdings
593
Portfolio Turnover Rate
24%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Portfolio Composition*,† (% of Total Investments)
image
 [7],[8]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class N  
Shareholder Report [Line Items]  
Fund Name Putnam Ultra Short Duration Income Fund
Class Name Class N
Trading Symbol PSDNX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Ultra Short Duration Income Fund for the period August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Class N
$29
0.56%
[9],[10]
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.56%
Net Assets $ 12,587,329,162
Holdings Count | $ / shares 593
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Total Net Assets
$12,587,329,162
Total Number of Portfolio Holdings
593
Portfolio Turnover Rate
24%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Portfolio Composition*,† (% of Total Investments)
image
 [11],[12]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class R  
Shareholder Report [Line Items]  
Fund Name Putnam Ultra Short Duration Income Fund
Class Name Class R
Trading Symbol PSDRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Ultra Short Duration Income Fund for the period August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Class R
$41
0.81%
[13],[14]
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.81%
Net Assets $ 12,587,329,162
Holdings Count | $ / shares 593
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Total Net Assets
$12,587,329,162
Total Number of Portfolio Holdings
593
Portfolio Turnover Rate
24%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Portfolio Composition*,† (% of Total Investments)
image
 [15],[16]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class R6  
Shareholder Report [Line Items]  
Fund Name Putnam Ultra Short Duration Income Fund
Class Name Class R6
Trading Symbol PSDQX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Ultra Short Duration Income Fund for the period August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Class R6
$15
0.29%
[17],[18]
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.29%
Net Assets $ 12,587,329,162
Holdings Count | $ / shares 593
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Total Net Assets
$12,587,329,162
Total Number of Portfolio Holdings
593
Portfolio Turnover Rate
24%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Portfolio Composition*,† (% of Total Investments)
image
 [19],[20]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class Y  
Shareholder Report [Line Items]  
Fund Name Putnam Ultra Short Duration Income Fund
Class Name Class Y
Trading Symbol PSDYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Ultra Short Duration Income Fund for the period August 1, 2025, to January 31, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*,†
Class Y
$16
0.31%
[21],[22]
Expenses Paid, Amount $ 16
Expense Ratio, Percent 0.31%
Net Assets $ 12,587,329,162
Holdings Count | $ / shares 593
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of January 31, 2026)
Total Net Assets
$12,587,329,162
Total Number of Portfolio Holdings
593
Portfolio Turnover Rate
24%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of January 31, 2026)
Portfolio Composition*,† (% of Total Investments)
image
 [23],[24]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
[1]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[2]
† Annualized.
[3]
* Does not include derivatives, except purchased options, if any.  
[4]
† Certain categories may represent less than 0.1%.
[5]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[6]
† Annualized.
[7]
* Does not include derivatives, except purchased options, if any.  
[8]
† Certain categories may represent less than 0.1%.
[9]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[10]
† Annualized.
[11]
* Does not include derivatives, except purchased options, if any.  
[12]
† Certain categories may represent less than 0.1%.
[13]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[14]
† Annualized.
[15]
* Does not include derivatives, except purchased options, if any.  
[16]
† Certain categories may represent less than 0.1%.
[17]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[18]
† Annualized.
[19]
* Does not include derivatives, except purchased options, if any.  
[20]
† Certain categories may represent less than 0.1%.
[21]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[22]
† Annualized.
[23]
* Does not include derivatives, except purchased options, if any.  
[24]
† Certain categories may represent less than 0.1%.