| Shareholder Report | 12 Months Ended |
| Sep. 30, 2024 USD ($) Holding |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Gabelli Money Market Funds |
| Entity Central Index Key | 0000888129 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| 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 Annual shareholder report contains important information about The Gabelli U.S. Treasury Money Market Fund (the "Fund") for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.gabelli.com/funds/money_markets |
| Additional Information Phone Number | 800-GABELLI (800-422-3554) |
| Additional Information Website | www.gabelli.com/funds/money_markets</span>" id="sjs-B19"><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;">www.gabelli.com/funds/money_markets</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (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 $8 0.08% |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 0.08% |
| AssetsNet | $ 5,272,970,900 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 3,911,735 |
| Additional Fund Statistics [Text Block] | Fund Statistics Total Net Assets $5,272,970,900 # of Portfolio Holdings 36 Management Fees $3,911,735 |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 800-GABELLI (800-422-3554) |
| Updated Prospectus Email Address | info@gabelli.com</span>" id="sjs-B29"><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;">info@gabelli.com</span> |
| Updated Prospectus Web Address | www.gabelli.com/funds/money_markets</span>" id="sjs-B30"><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;">www.gabelli.com/funds/money_markets</span> |
| 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 Annual shareholder report contains important information about The Gabelli U.S. Treasury Money Market Fund (the "Fund") for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.gabelli.com/funds/money_markets |
| Additional Information Phone Number | 800-GABELLI (800-422-3554) |
| Additional Information Website | www.gabelli.com/funds/money_markets</span>" id="sjs-B40"><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;">www.gabelli.com/funds/money_markets</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (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 $8 0.08% |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 0.08% |
| AssetsNet | $ 5,272,970,900 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 3,911,735 |
| Additional Fund Statistics [Text Block] | Fund Statistics Total Net Assets $5,272,970,900 # of Portfolio Holdings 36 Management Fees $3,911,735 |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 800-GABELLI (800-422-3554) |
| Updated Prospectus Email Address | info@gabelli.com</span>" id="sjs-B50"><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;">info@gabelli.com</span> |
| Updated Prospectus Web Address | www.gabelli.com/funds/money_markets</span>" id="sjs-B51"><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;">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 Annual shareholder report contains important information about The Gabelli U.S. Treasury Money Market Fund (the "Fund") for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.gabelli.com/funds/money_markets |
| Additional Information Phone Number | 800-GABELLI (800-422-3554) |
| Additional Information Website | www.gabelli.com/funds/money_markets</span>" id="sjs-B61"><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;">www.gabelli.com/funds/money_markets</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (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 $8 0.08% |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 0.08% |
| AssetsNet | $ 5,272,970,900 |
| Holdings Count | Holding | 36 |
| Advisory Fees Paid, Amount | $ 3,911,735 |
| Additional Fund Statistics [Text Block] | Fund Statistics Total Net Assets $5,272,970,900 # of Portfolio Holdings 36 Management Fees $3,911,735 |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 800-GABELLI (800-422-3554) |
| Updated Prospectus Email Address | info@gabelli.com</span>" id="sjs-B71"><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;">info@gabelli.com</span> |
| Updated Prospectus Web Address | www.gabelli.com/funds/money_markets</span>" id="sjs-B72"><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;">www.gabelli.com/funds/money_markets</span> |
