| Form N-CSR Cover | 6 Months Ended |
| Aug. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | T. ROWE PRICE TAX-EXEMPT MONEY FUND, INC. |
| Entity Central Index Key | 0000315748 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| Shareholder Report | 6 Months Ended |
| Aug. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | T. ROWE PRICE TAX-EXEMPT MONEY FUND, INC. |
| Entity Central Index Key | 0000315748 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| C000005557 | |
| Shareholder Report [Line Items] | |
| Fund Name | Tax-Exempt Money Fund |
| Class Name | Investor Class |
| Trading Symbol | PTEXX |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com |
| Material Fund Change Notice [Text Block] | |
| Additional Information Phone Number | 1‑800‑638‑5660 |
| Additional Information Email | info@troweprice.com</span>" id="sjs-B19"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify;">info@troweprice.com</span> |
| Additional Information Website | www.troweprice.com/prospectus |
| Expenses [Text Block] | What were the fund costs for the last six months? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Tax-Exempt Money Fund - Investor Class $23 0.45% |
| Expenses Paid, Amount | $ 23 |
| Expense Ratio, Percent | 0.45% |
| AssetsNet | $ 660,947,000 |
| Holdings Count | Holding | 219 |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $660,947 Number of Portfolio Holdings 219 |
| Holdings [Text Block] | Security Variable Rate Demand Notes 39.2 % Other Municipal Security 36.4 Non-Financial Company Commercial Paper 24.2 Other Assets less Liabilities 0.2 |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | www.troweprice.com/paperless |
| C000193189 | |
| Shareholder Report [Line Items] | |
| Fund Name | Tax-Exempt Money Fund |
| Class Name | I Class |
| Trading Symbol | TERXX |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com |
| Material Fund Change Notice [Text Block] | |
| Additional Information Phone Number | 1‑800‑638‑5660 |
| Additional Information Email | info@troweprice.com</span>" id="sjs-B39"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify;">info@troweprice.com</span> |
| Additional Information Website | www.troweprice.com/prospectus |
| Expenses [Text Block] | What were the fund costs for the last six months? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Tax-Exempt Money Fund - I Class $12 0.24% |
| Expenses Paid, Amount | $ 12 |
| Expense Ratio, Percent | 0.24% |
| AssetsNet | $ 660,947,000 |
| Holdings Count | Holding | 219 |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $660,947 Number of Portfolio Holdings 219 |
| Holdings [Text Block] | Security Variable Rate Demand Notes 39.2 % Other Municipal Security 36.4 Non-Financial Company Commercial Paper 24.2 Other Assets less Liabilities 0.2 |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | www.troweprice.com/paperless |
| Shareholder Report, Holdings (Details) | Aug. 31, 2024 |
| C000005557 | Tarrant County Cultural Ed. Fac. Fin., Texas Health Resources System | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000005557 | Indiana Univ. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000005557 | Harris County Cultural Ed. Fac. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000005557 | Houston Combined Utility System | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000005557 | Missouri HEFA, SSM Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000005557 | California Statewide Communities Dev. Auth. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000005557 | Oregon DOT | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000005557 | Texas A&M Univ. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000005557 | New York City Transational Fin. Auth., Tender Option Bond Trust Receipts | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000005557 | Loudoun County Economic Dev. Auth., Howard Hughes Medical | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000005557 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000005557 | Variable Rate Demand Notes | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.20% |
| C000005557 | Other Municipal Security | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.40% |
| C000005557 | Non-Financial Company Commercial Paper | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.20% |
| C000193189 | Tarrant County Cultural Ed. Fac. Fin., Texas Health Resources System | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000193189 | Indiana Univ. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000193189 | Harris County Cultural Ed. Fac. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000193189 | Houston Combined Utility System | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000193189 | Missouri HEFA, SSM Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000193189 | California Statewide Communities Dev. Auth. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000193189 | Oregon DOT | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000193189 | Texas A&M Univ. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000193189 | New York City Transational Fin. Auth., Tender Option Bond Trust Receipts | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000193189 | Loudoun County Economic Dev. Auth., Howard Hughes Medical | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000193189 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000193189 | Variable Rate Demand Notes | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.20% |
| C000193189 | Other Municipal Security | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.40% |
| C000193189 | Non-Financial Company Commercial Paper | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.20% |
