v3.26.1
Fees and Expenses - NEW ALTERNATIVES FUND
Apr. 30, 2026
USD ($)
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses of the Fund
Expense Narrative [Text Block]

The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts on purchases of $25,000 or more of Class A Shares of the Fund. More information about this discount and other discounts is available from your financial intermediary and in the section “Reductions or Modifications of Sales Charges” on page 14 of this Prospectus, and in the sections “PURCHASE, REDEMPTION AND PRICING OF SHARES – How to Purchase Shares” and “PURCHASE, REDEMPTION AND PRICING OF SHARES – Sales Loads” beginning on page 23 of the Statement of Additional Information (the “SAI”).
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts on purchases of $25,000 or more of Class A Shares of the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] $ 25,000
Shareholder Fees Caption [Optional Text] Shareholder Fees (fees paid directly from your investment)
Shareholder Fees [Table]
    Investor Shares   Class A Shares  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)   None   3.50 %
Maximum Deferred Sales Charge (Load)   None   None  
Redemption Fee (as a percentage of amount redeemed) (imposed only if redemption occurs within 60 days of purchase)1   2.00 % None  
           
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
    Investor Shares   Class A Shares  
Management Fees   0.55 % 0.55 %
Distribution and/or Service (12b-1) Fees   0.25 % None  
Other Expenses:   0.55 % 0.55 %
Total Annual Fund Operating Expenses   1.35 % 1.10 %

 

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.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that: (i) you pay the maximum applicable sales charge, (ii) your investment has a 5% return each year, and (iii) the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your expenses would be:

 
Expense Example by, Year, Caption [Text] The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that: (i) you pay the maximum applicable sales charge, (ii) your investment has a 5% return each year, and (iii) the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your expenses would be:
Expense Example, With Redemption [Table]
    1 Year   3 Years   5 Years   10 Years
Investor Shares   $137   $428   $739   $1,624
Class A Shares   $458   $687   $935   $1,643
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 4.09% of the average value of its portfolio.
Portfolio Turnover, Rate 4.09%