v3.25.3
S000000777 [Member] Expense Example - Putnam Small Cap Growth Fund
Jun. 30, 2025
USD ($)
Class C shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 296
Expense Example, with Redemption, 3 Years 606
Expense Example, with Redemption, 5 Years 1,042
Expense Example, with Redemption, 10 Years 2,057
Class Y shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 94
Expense Example, with Redemption, 3 Years 294
Expense Example, with Redemption, 5 Years 510
Expense Example, with Redemption, 10 Years 1,132
Class A shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 687
Expense Example, with Redemption, 3 Years 925
Expense Example, with Redemption, 5 Years 1,182
Expense Example, with Redemption, 10 Years 1,915
Class R shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 145
Expense Example, with Redemption, 3 Years 450
Expense Example, with Redemption, 5 Years 777
Expense Example, with Redemption, 10 Years 1,703
Class R6 Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 78
Expense Example, with Redemption, 3 Years 243
Expense Example, with Redemption, 5 Years 423
Expense Example, with Redemption, 10 Years $ 944