v3.26.1
Shareholder Fees - NEW ALTERNATIVES FUND
Apr. 30, 2026
NEW ALTERNATIVES FUND Investor Shares  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%) [1]
NEW ALTERNATIVES FUND CLASS A SHARES  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 3.50%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (0.00%) [1]
[1] A two percent (2.00%) redemption fee is charged on Investor Shares held less than sixty (60) days and is retained by the Fund. This redemption fee is meant to prevent short-term trading in the Investor Shares of the Fund and to offset any transaction and other costs associated with short-term trading.