v3.25.4
Since Inception [Member] Expense Example - Putnam Retirement Advantage 2035 Fund
Aug. 31, 2025
USD ($)
Class R5 Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 56
Expense Example, with Redemption, 3 Years 176
Expense Example, with Redemption, 5 Years 498
Expense Example, with Redemption, 10 Years 1,410
Class A Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 652
Expense Example, with Redemption, 3 Years 816
Expense Example, with Redemption, 5 Years 1,172
Expense Example, with Redemption, 10 Years 2,170
Class C Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 258
Expense Example, with Redemption, 3 Years 490
Expense Example, with Redemption, 5 Years 1,027
Expense Example, with Redemption, 10 Years 2,305
Class R Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 122
Expense Example, with Redemption, 3 Years 381
Expense Example, with Redemption, 5 Years 844
Expense Example, with Redemption, 10 Years 2,128
Class R6 Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 46
Expense Example, with Redemption, 3 Years 144
Expense Example, with Redemption, 5 Years 443
Expense Example, with Redemption, 10 Years 1,294
Class Y Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 56
Expense Example, with Redemption, 3 Years 176
Expense Example, with Redemption, 5 Years 498
Expense Example, with Redemption, 10 Years 1,410
Class R3 Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 97
Expense Example, with Redemption, 3 Years 303
Expense Example, with Redemption, 5 Years 712
Expense Example, with Redemption, 10 Years 1,858
Class R4 Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 72
Expense Example, with Redemption, 3 Years 225
Expense Example, with Redemption, 5 Years 579
Expense Example, with Redemption, 10 Years $ 1,580