| 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-FREE HIGH YIELD FUND, INC. |
| Entity Central Index Key | 0000758003 |
| 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-FREE HIGH YIELD FUND, INC. |
| Entity Central Index Key | 0000758003 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| C000005558 | |
| Shareholder Report [Line Items] | |
| Fund Name | Tax-Free High Yield Fund |
| Class Name | Investor Class |
| Trading Symbol | PRFHX |
| 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] | This report describes changes to the fund that occurred during the reporting period. |
| 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-Free High Yield Fund - Investor Class $35 0.67% |
| Expenses Paid, Amount | $ 35 |
| Expense Ratio, Percent | 0.67% |
| AssetsNet | $ 3,404,308,000 |
| Holdings Count | Holding | 993 |
| InvestmentCompanyPortfolioTurnover | 6.90% |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $3,404,308 Number of Portfolio Holdings 993 |
| Holdings [Text Block] | Credit Quality * AAA Rated 0.5 % AA Rated 8.0 A Rated 11.1 BBB Rated 20.0 BB Rated and Below 15.1 Not Rated 44.8 Reserves 0.5 *Credit ratings for the securities held in the Fund are provided by Moody’s, Standard & Poor’s, and Fitch and are converted to the Standard & Poor’s nomenclature. A rating of AAA represents the highest-rated securities, and a rating of D represents the lowest rated securities. If the ratings agencies differ, the highest rating is applied to the security. If a rating is not available, the security is classified as Not Rated. The rating of the underlying investment vehicle is used to determine the creditworthiness of credit default swaps and sovereign securities. The Fund is not rated by any agency. |
| Material Fund Change [Text Block] | How has the fund changed? Effective November 1, 2024, Price Associates has contractually agreed to lower the fund’s total investment management fee to 0.45% and lower the class’s total expense limit to 0.80%. For more complete information, please review the fund’s prospectus. |
| Updated Prospectus Web Address | www.troweprice.com/paperless |
| C000117193 | |
| Shareholder Report [Line Items] | |
| Fund Name | Tax-Free High Yield Fund |
| Class Name | Advisor Class |
| Trading Symbol | PATFX |
| 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] | This report describes changes to the fund that occurred during the reporting period. |
| Additional Information Phone Number | 1‑800‑638‑5660 |
| Additional Information Email | info@troweprice.com</span>" id="sjs-B40"><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-Free High Yield Fund - Advisor Class $52 1.01% |
| Expenses Paid, Amount | $ 52 |
| Expense Ratio, Percent | 1.01% |
| AssetsNet | $ 3,404,308,000 |
| Holdings Count | Holding | 993 |
| InvestmentCompanyPortfolioTurnover | 6.90% |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $3,404,308 Number of Portfolio Holdings 993 |
| Holdings [Text Block] | Credit Quality * AAA Rated 0.5 % AA Rated 8.0 A Rated 11.1 BBB Rated 20.0 BB Rated and Below 15.1 Not Rated 44.8 Reserves 0.5 *Credit ratings for the securities held in the Fund are provided by Moody’s, Standard & Poor’s, and Fitch and are converted to the Standard & Poor’s nomenclature. A rating of AAA represents the highest-rated securities, and a rating of D represents the lowest rated securities. If the ratings agencies differ, the highest rating is applied to the security. If a rating is not available, the security is classified as Not Rated. The rating of the underlying investment vehicle is used to determine the creditworthiness of credit default swaps and sovereign securities. The Fund is not rated by any agency. |
| Material Fund Change [Text Block] | How has the fund changed? Effective November 1, 2024, Price Associates has contractually agreed to lower the fund’s total investment management fee to 0.45% and lower the class’s total expense limit to 1.05%. For more complete information, please review the fund’s prospectus. |
| Updated Prospectus Web Address | www.troweprice.com/paperless |
| C000177208 | |
| Shareholder Report [Line Items] | |
| Fund Name | Tax-Free High Yield Fund |
| Class Name | I Class |
| Trading Symbol | PTYIX |
| 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] | This report describes changes to the fund that occurred during the reporting period. |
| Additional Information Phone Number | 1‑800‑638‑5660 |
| Additional Information Email | info@troweprice.com</span>" id="sjs-B61"><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-Free High Yield Fund - I Class $28 0.54% |
| Expenses Paid, Amount | $ 28 |
| Expense Ratio, Percent | 0.54% |
| AssetsNet | $ 3,404,308,000 |
| Holdings Count | Holding | 993 |
| InvestmentCompanyPortfolioTurnover | 6.90% |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $3,404,308 Number of Portfolio Holdings 993 |
| Holdings [Text Block] | Credit Quality * AAA Rated 0.5 % AA Rated 8.0 A Rated 11.1 BBB Rated 20.0 BB Rated and Below 15.1 Not Rated 44.8 Reserves 0.5 *Credit ratings for the securities held in the Fund are provided by Moody’s, Standard & Poor’s, and Fitch and are converted to the Standard & Poor’s nomenclature. A rating of AAA represents the highest-rated securities, and a rating of D represents the lowest rated securities. If the ratings agencies differ, the highest rating is applied to the security. If a rating is not available, the security is classified as Not Rated. The rating of the underlying investment vehicle is used to determine the creditworthiness of credit default swaps and sovereign securities. The Fund is not rated by any agency. |
| Material Fund Change [Text Block] | How has the fund changed? Effective November 1, 2024, Price Associates has contractually agreed to lower the fund’s total investment management fee to 0.45%. For more complete information, please review the fund’s prospectus. |
| Updated Prospectus Web Address | www.troweprice.com/paperless |
| Shareholder Report, Holdings (Details) | Aug. 31, 2024 |
| C000005558 | AAA Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000005558 | AA Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| C000005558 | A Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| C000005558 | BBB Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| C000005558 | BB Rated and Below | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.10% |
| C000005558 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 44.80% |
| C000005558 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000005558 | Hospital Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.90% |
| C000005558 | Air & Sea Transportation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.70% |
| C000005558 | Housing Finance Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000005558 | Industrial & Pollution Control Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000005558 | Educational Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000005558 | Dedicated Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000005558 | General Obligations - State | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000005558 | Water & Sewer Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000005558 | General Obligations - Local | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000005558 | Other | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27% |
| C000117193 | AAA Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000117193 | AA Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| C000117193 | A Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| C000117193 | BBB Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| C000117193 | BB Rated and Below | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.10% |
| C000117193 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 44.80% |
| C000117193 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000117193 | Hospital Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.90% |
| C000117193 | Air & Sea Transportation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.70% |
| C000117193 | Housing Finance Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000117193 | Industrial & Pollution Control Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000117193 | Educational Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000117193 | Dedicated Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000117193 | General Obligations - State | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000117193 | Water & Sewer Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000117193 | General Obligations - Local | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000117193 | Other | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27% |
| C000177208 | AAA Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000177208 | AA Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| C000177208 | A Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| C000177208 | BBB Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| C000177208 | BB Rated and Below | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.10% |
| C000177208 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 44.80% |
| C000177208 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000177208 | Hospital Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.90% |
| C000177208 | Air & Sea Transportation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.70% |
| C000177208 | Housing Finance Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000177208 | Industrial & Pollution Control Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000177208 | Educational Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000177208 | Dedicated Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000177208 | General Obligations - State | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000177208 | Water & Sewer Revenue | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| C000177208 | General Obligations - Local | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000177208 | Other | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27% |
