v3.25.3
S000003999 [Member] Annual Fund Operating Expenses - Putnam Sustainable Retirement 2035 Fund
Jul. 31, 2025
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination November 30, 2028
Class R4  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.48% [1]
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.32%
Acquired Fund Fees and Expenses 0.48%
Expenses (as a percentage of Assets) 1.28% [2]
Fee Waiver or Reimbursement (0.53%) [3]
Net Expenses (as a percentage of Assets) 0.75%
Class R5  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.48% [1]
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.17%
Acquired Fund Fees and Expenses 0.48%
Expenses (as a percentage of Assets) 1.13% [2]
Fee Waiver or Reimbursement (0.53%) [3]
Net Expenses (as a percentage of Assets) 0.60%
Class R3  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.48% [1]
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.32%
Acquired Fund Fees and Expenses 0.48%
Expenses (as a percentage of Assets) 1.53% [2]
Fee Waiver or Reimbursement (0.53%) [3]
Net Expenses (as a percentage of Assets) 1.00%
Class A  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.48% [1]
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.17%
Acquired Fund Fees and Expenses 0.48%
Expenses (as a percentage of Assets) 1.38% [2]
Fee Waiver or Reimbursement (0.53%) [3]
Net Expenses (as a percentage of Assets) 0.85%
Class C  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.48% [1]
Distribution and Service (12b-1) Fees 1.00%
Other Expenses (as a percentage of Assets): 0.17%
Acquired Fund Fees and Expenses 0.48%
Expenses (as a percentage of Assets) 2.13% [2]
Fee Waiver or Reimbursement (0.53%) [3]
Net Expenses (as a percentage of Assets) 1.60%
Class R  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.48% [1]
Distribution and Service (12b-1) Fees 0.50%
Other Expenses (as a percentage of Assets): 0.32%
Acquired Fund Fees and Expenses 0.48%
Expenses (as a percentage of Assets) 1.78% [2]
Fee Waiver or Reimbursement (0.53%) [3]
Net Expenses (as a percentage of Assets) 1.25%
Class Y  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.48% [1]
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.17%
Acquired Fund Fees and Expenses 0.48%
Expenses (as a percentage of Assets) 1.13% [2]
Fee Waiver or Reimbursement (0.53%) [3]
Net Expenses (as a percentage of Assets) 0.60%
Class R6  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.48% [1]
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.07%
Acquired Fund Fees and Expenses 0.48%
Expenses (as a percentage of Assets) 1.03% [2]
Fee Waiver or Reimbursement (0.53%) [3]
Net Expenses (as a percentage of Assets) 0.50%
[1] Management fees have been restated to reflect the reduced management fee rate that took effect under the fund’s management agreement effective September 30, 2025 based on the number of years remaining until the date referenced in the fund’s name. Consequently, the fund’s total annual fund operating expenses differ from the ratio of expenses to average net assets shown in the fund’s financial highlights.
[2] Total annual fund operating expenses do not correlate with the ratios of expenses to average net assets reported in the fund’s financial highlights tables, which reflect the fund’s operating expenses and do not include acquired fund fees and expenses.
[3] The Investment Manager (as defined below) has contractually agreed to (1) waive fees and/or reimburse expenses in an amount equal to the fund’s “acquired fund fees and expenses” and (2) waive fees and/or reimburse operating expenses of the fund (excluding payments under the fund’s distribution plan, brokerage, interest, taxes, investment-related expenses (including borrowing costs, i.e., short selling and lines of credit costs), acquired fund fees and expenses and extraordinary expenses) so that the total annual fund operating expenses for class A, C, R, R3, R4, R5, R6 and Y shares will not exceed 0.60%, 0.60%, 0.75%, 0.75%, 0.75%, 0.60%, 0.50% and 0.60%, respectively, of the fund’s average net assets. These obligations may not be modified or discontinued prior to November 30, 2028, without approval of the Board of Trustees.