S000093658 [Member] Performance Management - Putnam Sustainable Retirement 2070 Fund |
Jul. 28, 2025 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance |
| Performance Narrative [Text Block] | Performance information will be available after the fund completes a full calendar year of operation.
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| Performance One Year or Less [Text] | Performance information will be available after the fund completes a full calendar year of operation. |