Shareholder Report, Average Annual Return (Details) 74200001190_Franklin Natural Resources Fund_Advisor Class_TSR Annual {Advisor Class} |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Apr. 30, 2026 |
Apr. 30, 2026 |
Apr. 30, 2026 |
|
| Advisor Class | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Advisor Class | ||
| Average Annual Return, Percent | 65.18% | 20.52% | 8.42% |
| Russell 3000 Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell 3000 Index | ||
| Average Annual Return, Percent | 31.01% | 11.91% | 14.76% |
| S&P North American Natural Resources Sector Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | S&P North American Natural Resources Sector Index | ||
| Average Annual Return, Percent | 53.73% | 20.81% | 10.34% |
| S&P Global Natural Resources Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | S&P Global Natural Resources Index | ||
| Average Annual Return, Percent | 49.88% | 12.01% | 10.96% |