v3.26.3
Shareholder Report
 6 Months Ended
Aug. 31, 2026
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, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000005557  
Shareholder Report [Line Items]  
Fund Name Municipal Money Fund
Class Name Investor Class
Trading Symbol PTEXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Municipal Money Fund (the "fund") for the period of March 1, 2026 to August 31, 2026.
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 atwww.troweprice.com/prospectus. You can also request this information without charge by contacting T. Rowe Price at 1‑800‑638‑5660 or info@troweprice.com or contacting your intermediary.
Material Fund Change Notice [Text Block]  
Additional Information Phone Number 1‑800‑638‑5660
Additional Information Email <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; text-align-last: left; white-space-collapse: preserve-breaks;">info@troweprice.com</span>
Additional Information Website www.troweprice.com/prospectus
Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Municipal Money Fund - Investor Class
$23
0.45%
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.45%
AssetsNet $ 649,907,000
Holdings Count | Holding 190
Additional Fund Statistics [Text Block]

What are some fund statistics?

Fund Statistics

Table Summary
Total Net Assets (000s)
$649,907
Number of Portfolio Holdings
190
Holdings [Text Block]

Security Allocation (as a % of Net Assets)

Table Summary
Other Municipal Security
46.9%
Variable Rate Demand Notes
31.3
Non-Financial Company Commercial Paper
19.9
Other Instruments
0.8
Short-Term and Other
1.1

Top Ten Holdings (as a % of Net Assets)

Table Summary
RBC Municipal Products Trust
2.4%
Vermont Ed. & Health Buildings Fin. Agency, Fletcher Allen Health Care
2.3
Rhode Island Health & Ed. Building, Brown Univ.
2.2
New York State Dormitory Auth., Tender Option Bond Trust Receipts
2.1
South Carolina Public Service Auth.
1.9
Louisiana Offshore Terminal Auth., Loop Project
1.9
Illinois Fin. Auth.
1.9
Illinois Fin. Auth., Steppenwolf Theatre Company Project
1.7
Kentucky Higher Ed. Student Loan
1.7
Univ. of Michigan, Board of Trustees
1.6
Material Fund Change [Text Block]
Updated Prospectus Web Address www.troweprice.com/paperless
C000193189  
Shareholder Report [Line Items]  
Fund Name Municipal Money Fund
Class Name I Class
Trading Symbol TERXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Municipal Money Fund (the "fund") for the period of March 1, 2026 to August 31, 2026.
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 atwww.troweprice.com/prospectus. You can also request this information without charge by contacting T. Rowe Price at 1‑800‑638‑5660 or info@troweprice.com or contacting your intermediary.
Material Fund Change Notice [Text Block]  
Additional Information Phone Number 1‑800‑638‑5660
Additional Information Email <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; text-align-last: left; white-space-collapse: preserve-breaks;">info@troweprice.com</span>
Additional Information Website www.troweprice.com/prospectus
Expenses [Text Block]

What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)

Table Summary
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Municipal Money Fund - I Class
$12
0.24%
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.24%
AssetsNet $ 649,907,000
Holdings Count | Holding 190
Additional Fund Statistics [Text Block]

What are some fund statistics?

Fund Statistics

Table Summary
Total Net Assets (000s)
$649,907
Number of Portfolio Holdings
190
Holdings [Text Block]

Security Allocation (as a % of Net Assets)

Table Summary
Other Municipal Security
46.9%
Variable Rate Demand Notes
31.3
Non-Financial Company Commercial Paper
19.9
Other Instruments
0.8
Short-Term and Other
1.1

Top Ten Holdings (as a % of Net Assets)

Table Summary
RBC Municipal Products Trust
2.4%
Vermont Ed. & Health Buildings Fin. Agency, Fletcher Allen Health Care
2.3
Rhode Island Health & Ed. Building, Brown Univ.
2.2
New York State Dormitory Auth., Tender Option Bond Trust Receipts
2.1
South Carolina Public Service Auth.
1.9
Louisiana Offshore Terminal Auth., Loop Project
1.9
Illinois Fin. Auth.
1.9
Illinois Fin. Auth., Steppenwolf Theatre Company Project
1.7
Kentucky Higher Ed. Student Loan
1.7
Univ. of Michigan, Board of Trustees
1.6
Material Fund Change [Text Block]
Updated Prospectus Web Address www.troweprice.com/paperless