v3.25.1
Shareholder Report
 6 Months Ended
Mar. 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Gabelli Money Market Funds
Entity Central Index Key 0000888129
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2025
C000072955  
Shareholder Report [Line Items]  
Fund Name The Gabelli U.S. Treasury Money Market Fund
Class Name Class C
Trading Symbol GBCXX
Annual or Semi-Annual Statement [Text Block] This Semi-Annual shareholder report contains important information about The Gabelli U.S. Treasury Money Market Fund (the "Fund") for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/money_markets. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/money_markets</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli U.S. Treasury Money Market Fund - Class C
$4
0.08%
Expenses Paid, Amount $ 4
Expense Ratio, Percent 0.08%
AssetsNet $ 5,640,182,181
Holdings Count | Holding 36
Advisory Fees Paid, Amount $ 2,187,109
Additional Fund Statistics [Text Block]

Fund Statistics

Total Net Assets
$5,640,182,181
# of Portfolio Holdings
36
Management Fees
$2,187,109
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/money_markets</span>
C000002897  
Shareholder Report [Line Items]  
Fund Name The Gabelli U.S. Treasury Money Market Fund
Class Name Class I
Trading Symbol GABXX
Annual or Semi-Annual Statement [Text Block] This Semi-Annual shareholder report contains important information about The Gabelli U.S. Treasury Money Market Fund (the "Fund") for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/money_markets. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/money_markets</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli U.S. Treasury Money Market Fund - Class I
$4
0.08%
Expenses Paid, Amount $ 4
Expense Ratio, Percent 0.08%
AssetsNet $ 5,640,182,181
Holdings Count | Holding 36
Advisory Fees Paid, Amount $ 2,187,109
Additional Fund Statistics [Text Block]

Fund Statistics

Total Net Assets
$5,640,182,181
# of Portfolio Holdings
36
Management Fees
$2,187,109
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/money_markets</span>
C000072954  
Shareholder Report [Line Items]  
Fund Name The Gabelli U.S. Treasury Money Market Fund
Class Name Class A
Trading Symbol GBAXX
Annual or Semi-Annual Statement [Text Block] This Semi-Annual shareholder report contains important information about The Gabelli U.S. Treasury Money Market Fund (the "Fund") for the period of October 1, 2024 to March 31, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You may find additional information about the Fund at www.gabelli.com/funds/money_markets. You may also request  information by contacting us at 800-GABELLI (800-422-3554).
Additional Information Phone Number 800-GABELLI (800-422-3554)
Additional Information Website <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/money_markets</span>
Expenses [Text Block]

What were the Fund costs for the last six months? 

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10k Investment
Costs Paid as a % of a $10k Investment
The Gabelli U.S. Treasury Money Market Fund - Class A
$4
0.08%
Expenses Paid, Amount $ 4
Expense Ratio, Percent 0.08%
AssetsNet $ 5,640,182,181
Holdings Count | Holding 36
Advisory Fees Paid, Amount $ 2,187,109
Additional Fund Statistics [Text Block]

Fund Statistics

Total Net Assets
$5,640,182,181
# of Portfolio Holdings
36
Management Fees
$2,187,109
Material Fund Change [Text Block]
Updated Prospectus Phone Number 800-GABELLI (800-422-3554)
Updated Prospectus Email Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">info@gabelli.com</span>
Updated Prospectus Web Address <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: justify; white-space-collapse: preserve-breaks;">www.gabelli.com/funds/money_markets</span>