Expense Example - NEW ALTERNATIVES FUND |
Apr. 30, 2026
USD ($)
|
|---|---|
| NEW ALTERNATIVES FUND Investor Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 137 |
| Expense Example, with Redemption, 3 Years | 428 |
| Expense Example, with Redemption, 5 Years | 739 |
| Expense Example, with Redemption, 10 Years | 1,624 |
| NEW ALTERNATIVES FUND CLASS A SHARES | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 458 |
| Expense Example, with Redemption, 3 Years | 687 |
| Expense Example, with Redemption, 5 Years | 935 |
| Expense Example, with Redemption, 10 Years | $ 1,643 |