v3.25.4
Since Inception [Member] Expense Example - Putnam Retirement Advantage 2050 Fund
Aug. 31, 2025
USD ($)
Class R5  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 56
Expense Example, with Redemption, 3 Years 176
Expense Example, with Redemption, 5 Years 567
Expense Example, with Redemption, 10 Years 1,664
Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 652
Expense Example, with Redemption, 3 Years 816
Expense Example, with Redemption, 5 Years 1,236
Expense Example, with Redemption, 10 Years 2,406
Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 258
Expense Example, with Redemption, 3 Years 490
Expense Example, with Redemption, 5 Years 1,093
Expense Example, with Redemption, 10 Years 2,541
Class R  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 122
Expense Example, with Redemption, 3 Years 381
Expense Example, with Redemption, 5 Years 912
Expense Example, with Redemption, 10 Years 2,369
Class Y  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 56
Expense Example, with Redemption, 3 Years 176
Expense Example, with Redemption, 5 Years 567
Expense Example, with Redemption, 10 Years 1,664
Class R6  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 46
Expense Example, with Redemption, 3 Years 144
Expense Example, with Redemption, 5 Years 513
Expense Example, with Redemption, 10 Years 1,553
Class R3  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 97
Expense Example, with Redemption, 3 Years 303
Expense Example, with Redemption, 5 Years 780
Expense Example, with Redemption, 10 Years 2,103
Class R4  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 72
Expense Example, with Redemption, 3 Years 225
Expense Example, with Redemption, 5 Years 649
Expense Example, with Redemption, 10 Years $ 1,833