S000000777 [Member] Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Putnam Small Cap Growth Fund | Class A shares | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 22.98% | 22.87% | (28.10%) | 14.13% | 47.65% | 37.66% | (2.56%) | 20.19% | 8.50% | (2.82%) |