Annual Fund Operating Expenses - NEW ALTERNATIVES FUND |
Apr. 30, 2026 |
|---|---|
| NEW ALTERNATIVES FUND Investor Shares | |
| Prospectus [Line Items] | |
| Management Fees (as a percentage of Assets) | 0.55% |
| Distribution and Service (12b-1) Fees | 0.25% |
| Other Expenses (as a percentage of Assets): | 0.55% |
| Net Expenses (as a percentage of Assets) | 1.35% |
| NEW ALTERNATIVES FUND CLASS A SHARES | |
| Prospectus [Line Items] | |
| Management Fees (as a percentage of Assets) | 0.55% |
| Distribution and Service (12b-1) Fees | 0.00% |
| Other Expenses (as a percentage of Assets): | 0.55% |
| Net Expenses (as a percentage of Assets) | 1.10% |