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-FREE INCOME FUND, INC.
Entity Central Index Key 0000202927
Entity Investment Company Type N-1A
Document Period End Date Aug. 31, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000005559  
Shareholder Report [Line Items]  
Fund Name Core Municipal Bond Fund
Class Name Investor Class
Trading Symbol PRTAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Core Municipal Bond 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
Core Municipal Bond Fund - Investor Class
$21
0.41%
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.41%
AssetsNet $ 2,270,383,000
Holdings Count | Holding 664
InvestmentCompanyPortfolioTurnover 13.70%
Additional Fund Statistics [Text Block]

What are some fund statistics?

Fund Statistics

Table Summary
Total Net Assets (000s)
$2,270,383
Number of Portfolio Holdings
664
Holdings [Text Block]

State Allocation (as a % of Net Assets)

Table Summary
Georgia
9.9%
New York
9.2
Texas
8.9
California
5.8
Maryland
5.8
Puerto Rico
5.5
Virginia
4.8
Illinois
4.2
New Jersey
3.4
Other
42.5

Industry Allocation (as a % of Net Assets)

Table Summary
Health Care
19.5%
Housing
13.9
Transportation
13.5
Special Tax
12.7
Education
7.3
General Obligations - State
6.1
General Obligations - Local
4.1
Leasing
3.2
Water & Sewer
2.3
Other
17.4
Material Fund Change [Text Block]
Updated Prospectus Web Address www.troweprice.com/paperless
C000005560  
Shareholder Report [Line Items]  
Fund Name Core Municipal Bond Fund
Class Name Advisor Class
Trading Symbol PATAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Core Municipal Bond 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
Core Municipal Bond Fund - Advisor Class
$39
0.78%
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.78%
AssetsNet $ 2,270,383,000
Holdings Count | Holding 664
InvestmentCompanyPortfolioTurnover 13.70%
Additional Fund Statistics [Text Block]

What are some fund statistics?

Fund Statistics

Table Summary
Total Net Assets (000s)
$2,270,383
Number of Portfolio Holdings
664
Holdings [Text Block]

State Allocation (as a % of Net Assets)

Table Summary
Georgia
9.9%
New York
9.2
Texas
8.9
California
5.8
Maryland
5.8
Puerto Rico
5.5
Virginia
4.8
Illinois
4.2
New Jersey
3.4
Other
42.5

Industry Allocation (as a % of Net Assets)

Table Summary
Health Care
19.5%
Housing
13.9
Transportation
13.5
Special Tax
12.7
Education
7.3
General Obligations - State
6.1
General Obligations - Local
4.1
Leasing
3.2
Water & Sewer
2.3
Other
17.4
Material Fund Change [Text Block]
Updated Prospectus Web Address www.troweprice.com/paperless
C000193190  
Shareholder Report [Line Items]  
Fund Name Core Municipal Bond Fund
Class Name I Class
Trading Symbol TFILX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Core Municipal Bond 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
Core Municipal Bond Fund - I Class
$19
0.38%
Expenses Paid, Amount $ 19
Expense Ratio, Percent 0.38%
AssetsNet $ 2,270,383,000
Holdings Count | Holding 664
InvestmentCompanyPortfolioTurnover 13.70%
Additional Fund Statistics [Text Block]

What are some fund statistics?

Fund Statistics

Table Summary
Total Net Assets (000s)
$2,270,383
Number of Portfolio Holdings
664
Holdings [Text Block]

State Allocation (as a % of Net Assets)

Table Summary
Georgia
9.9%
New York
9.2
Texas
8.9
California
5.8
Maryland
5.8
Puerto Rico
5.5
Virginia
4.8
Illinois
4.2
New Jersey
3.4
Other
42.5

Industry Allocation (as a % of Net Assets)

Table Summary
Health Care
19.5%
Housing
13.9
Transportation
13.5
Special Tax
12.7
Education
7.3
General Obligations - State
6.1
General Obligations - Local
4.1
Leasing
3.2
Water & Sewer
2.3
Other
17.4
Material Fund Change [Text Block]
Updated Prospectus Web Address www.troweprice.com/paperless