v3.25.4
Since Inception [Member] Expense Example - Putnam Retirement Advantage 2030 Fund
Aug. 31, 2025
USD ($)
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 585
Expense Example, with Redemption, 10 Years 1,598
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 1,031
Expense Example, with Redemption, 10 Years 2,321
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 448
Expense Example, with Redemption, 10 Years 1,311
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 502
Expense Example, with Redemption, 10 Years 1,426
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 1,176
Expense Example, with Redemption, 10 Years 2,187
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 502
Expense Example, with Redemption, 10 Years 1,426
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 717
Expense Example, with Redemption, 10 Years $ 1,874