S000093658 [Member] Expense Example, No Redemption - Putnam Sustainable Retirement 2070 Fund - CLASS C |
Jul. 31, 2025
USD ($)
|
|---|---|
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 173 |
| Expense Example, No Redemption, 3 Years | $ 3,297 |