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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName T. Rowe Price State Tax-Free Funds, Inc.
Prospectus Date rr_ProspectusDate Jul. 01, 2018
T. Rowe Price New York Tax-Free Money Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading T. Rowe Price
New York Tax-Free Money Fund

Investor Class

I Class

SUMMARY
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide preservation of capital, liquidity, and, consistent with these objectives, the highest level of income exempt from federal, New York state, and New York City income taxes.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the fund. You may also incur brokerage commissions and other charges when buying or selling shares of the fund, which are not reflected in the table.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses
(expenses that you pay each year as a
percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination June 30, 2019
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions You may also incur brokerage commissions and other charges when buying or selling shares of the fund, which are not reflected in the table.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods, that your investment has a 5% return each year, and that the fund’s operating expenses remain the same. The example also assumes that an expense limitation arrangement currently in place is not renewed; therefore, the figures have been adjusted to reflect fee waivers or expense reimbursements only in the periods for which the expense limitation arrangement is expected to continue. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Investments, Risks, and Performance

Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund will invest at least 65% of its total assets in New York municipal securities, and at least 80% of the fund’s income is expected to be exempt from federal, New York state, and New York City income taxes. The fund is a retail money market fund managed in compliance with Rule 2a-7 under the Investment Company Act of 1940.

The securities purchased by the fund are subject to the maturity, credit quality, diversification, and other requirements of Rule 2a-7. All securities purchased by the fund present minimal credit risk in the opinion of T. Rowe Price. The fund is managed to provide a stable share price of $1.00 by investing in high-quality U.S. dollar-denominated municipal money market securities. Money market securities are generally high-quality, short-term obligations issued by companies or governmental entities. The fund’s weighted average maturity will not exceed 60 calendar days, the fund’s weighted average life will not exceed 120 calendar days, and the fund will not purchase any security with a remaining maturity longer than 397 calendar days (unless otherwise permitted by Rule 2a-7, such as certain variable and floating rate instruments). When calculating its weighted average maturity, the fund may shorten its maturity by using the interest rate resets of certain adjustable rate securities. The fund may not take into account these resets when calculating its weighted average life.

In selecting securities for the fund, the portfolio manager may examine relationships among yields of various types and maturities of money market securities in the context of interest rate outlooks. The fund’s yield will fluctuate with changes in short-term interest rates.

Up to 20% of the fund’s income could be derived from securities that are subject to the alternative minimum tax.

The fund may invest a significant portion of assets in securities that are not general obligations of the state. These may be issued by local governments or public authorities and are rated according to their particular creditworthiness, which may vary from the state’s general obligation securities. From time to time, the fund may invest a significant portion of its assets in sectors with special risks, such as health care, transportation, and utilities, as well as private activity bonds (including industrial revenue bonds), which are municipal bonds issued by a government agency on behalf of a private sector company and, in most cases, are not backed by the credit of the issuing municipality. The fund may at times invest more than 25% of its net assets overall in industrial revenue bonds, but investments in industrial revenue bonds related to the same industry may not exceed 25% of the fund’s net assets.

Due to seasonal variations in the supply of suitable New York municipal securities, the fund may invest in other municipal securities whose interest is exempt from federal but not New York income taxes. While efforts will be made to minimize such investments, they could comprise up to 10% of the fund’s annual income.

The fund may sell holdings for a variety of reasons, such as to adjust the portfolio’s average maturity, duration, or overall credit quality, or to shift assets into and out of higher-yielding or lower-yielding securities or certain sectors.

In accordance with the requirements for “retail money market funds” under Rule 2a-7, the fund has implemented policies and procedures designed to limit new investments in the fund to accounts beneficially owned by natural persons. The fund has also obtained assurances from its intermediaries that they have developed adequate procedures to limit accounts to only those beneficially owned by natural persons. Any new investors wishing to purchase shares may be required to demonstrate eligibility (for example, by providing their Social Security number).

Pursuant to Rule 2a-7, if the fund’s weekly liquid assets fall below 30% of its total assets, the fund’s Board of Directors, in its discretion, may impose liquidity fees of up to 2% of the value of the shares redeemed or temporarily suspend redemptions from the fund for up to 10 business days during any 90-day period (i.e., a “redemption gate”). In addition, if the fund’s weekly liquid assets fall below 10% of its total assets at the end of any business day, the fund must impose a 1% liquidity fee on shareholder redemptions unless the fund’s Board of Directors determines that not doing so is in the best interests of the fund. Pursuant to Rule 2a-7, weekly liquid assets include cash, U.S. Treasuries, other government securities with remaining maturities of 60 days or less, or securities that mature or are subject to a demand feature within five business days.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock As with any mutual fund, there can be no guarantee the fund will achieve its objective. You could lose money by investing in the fund. Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the fund’s liquidity falls below required minimums because of market conditions or other factors. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. T. Rowe Price Associates, Inc. has no legal obligation to provide financial support to the fund, and you should not expect that T. Rowe Price Associates, Inc. will provide financial support to the fund at any time.

Money market funds have experienced significant pressures from shareholder redemptions, issuer credit downgrades, illiquid markets, and historically low yields on the securities they can hold. There have been a very small number of money market funds in other fund complexes that have “broken the buck,” which means that those funds’ investors did not receive $1.00 per share for their investment in those funds. The potential for realizing a loss of principal in the fund could derive from:

Credit risks An issuer of a debt instrument could suffer an adverse change in financial condition that results in a payment default (a failure to make scheduled interest or principal payments), rating downgrade, or inability to meet a financial obligation. Although the fund only purchases securities that present minimal credit risk in the opinion of T. Rowe Price, the credit quality of the fund’s holdings could change rapidly during periods of market stress.

Interest rate risks A decline in interest rates may lower the fund’s yield, or a rise in the overall level of interest rates may cause a decline in the prices of fixed income securities held by the fund. The fund’s yield will vary; it is not fixed for a specific period like the yield on a bank certificate of deposit. This is a disadvantage when interest rates are falling because the fund would have to reinvest at lower interest rates. The fund may face a heightened level of interest rate risk due to historically low interest rates and the potential effect of any government fiscal policy initiatives; for example, the U.S. Federal Reserve Board has ended its quantitative easing program and may continue to raise interest rates. A sharp and unexpected rise in interest rates could increase the likelihood that the fund’s share price will drop below a dollar.

Municipal securities risks The fund may be highly impacted by events tied to the overall municipal securities markets, which can be very volatile and significantly affected by unfavorable legislative or political developments and adverse changes in the financial conditions of municipal securities issuers and the economy. Income from municipal securities held by the fund could be declared taxable because of changes in tax laws or interpretations by taxing authorities, or noncompliant conduct of a municipality. Other changes in tax laws, including recent changes to individual or corporate tax rates, could alter the attractiveness and overall demand for municipal bonds. In addition, a portion of the fund’s otherwise tax-exempt dividends may be taxable to those shareholders subject to the alternative minimum tax.

Certain sectors of the municipal bond market have special risks that can impact such sectors more significantly than the market as a whole. For example: health care can be negatively impacted by rising expenses and dependency on third party reimbursements; transportation can be negatively impacted by declining revenues or unexpectedly high construction or fuel costs; utilities are subject to governmental rate regulation; and private activity bonds (including industrial development bonds) rely on project revenues and the creditworthiness of the corporate user as opposed to governmental support. Investing significantly in municipal obligations backed by revenues of similar types of industries or projects may make the fund more susceptible to developments affecting those industries and projects.

State-specific risks Economic conditions in New York may adversely affect the securities held by the fund. Because the fund invests primarily in securities issued by New York and its municipalities, it is more vulnerable to unfavorable developments in New York than are funds that invest in municipal securities of many states. Adverse developments in an economic sector may have far-reaching impacts on the overall New York municipal securities market. A bond default or credit rating downgrade, or even negative perceptions of the ability to make timely bond payments, involving only a small number of New York municipal securities issuers could affect the market values and marketability of all New York municipal securities. Due to New York City’s prominent role in the financial markets, New York’s overall economy can be heavily dependent on the financial sector and tends to be more sensitive to monetary policy actions and movements in the national and global economies than other states.

As of May 1, 2018, the state of New York’s general obligation debt was rated Aa1 by Moody’s Investors Service, Inc. (Moody’s), AA+ by S&P Global Ratings (S&P), and AA+ by Fitch Ratings, Inc. (Fitch). Moody’s, S&P and Fitch have all assigned a stable outlook.

Liquidity risks The fund may not be able to sell a holding in a timely manner at its current carrying value. The fund may experience heavy redemptions, particularly during periods of declining or illiquid markets, which could cause the fund to liquidate its assets at inopportune times or at a depressed value and affect the fund’s ability to maintain a $1.00 share price. The secondary market for certain municipal bonds tends to be less developed and less liquid than many other securities markets, which may adversely affect the fund’s ability to sell such municipal bonds at attractive prices. In addition, the fund’s Board has discretion to temporarily suspend fund redemptions when permitted by applicable regulations, to impose a liquidity fee, or to liquidate the fund if the fund’s weekly liquid assets fall below 10%.

Stable net asset value risks The fund may not be able to maintain a stable $1.00 share price at all times. If a money market fund fails to maintain a stable net asset value, or if there is a perceived threat that a money market fund is likely to fail to maintain a stable net asset value, money market funds in general, including the fund, could experience significant redemption activity. This could reduce the market prices of securities held by the fund and make it more difficult for the fund to maintain a stable $1.00 share price. The fund’s shareholders should not rely on or expect the fund’s investment adviser or an affiliate to purchase distressed assets from the fund, enter into capital support agreements with the fund, make capital infusions into the fund, or take other actions to help the fund maintain a stable $1.00 share price.

Redemption risks The fund may be subject to periods of increased redemptions that could cause the fund to sell its assets at disadvantageous times or at a depressed value or loss, particularly during periods of declining or illiquid markets, and that could affect the fund’s ability to maintain a stable $1.00 share price. Periods of heavy redemptions may result in the fund’s level of weekly liquid assets falling below certain minimums required by Rule 2a-7, which may result in the fund’s Board of Directors imposing a liquidity fee or redemption gate.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Risk Money Market Fund [Text] rr_RiskMoneyMarketFund Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following performance information provides some indication of the risks of investing in the fund. The fund’s performance information represents only past performance and is not necessarily an indication of future results.

The following bar chart illustrates how much returns can differ from year to year by showing calendar year returns and the best and worst calendar quarter returns during those years for the fund’s Investor Class. Returns for other share classes vary since they have different expenses.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the fund.

The following bar chart illustrates how much returns can differ from year to year by showing calendar year returns and the best and worst calendar quarter returns during those years for the fund’s Investor Class. Returns for other share classes vary since they have different expenses.

The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a comparative index that has investment characteristics similar to those of the fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress troweprice.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund’s performance information represents only past performance and is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading New York Tax-Free Money Fund
Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended    Total Return  Quarter Ended     Total Return
Best Quarter             3/31/08             0.51%      Worst Quarter            6/30/15            0.00%

The fund’s return for the three months ended 3/31/18 was 0.17%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns

Periods ended
December 31, 2017
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a comparative index that has investment characteristics similar to those of the fund.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com.
T. Rowe Price New York Tax-Free Money Fund | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee $ 20 [1]
Management fees rr_ManagementFeesOverAssets 0.39% [2]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets
Other expenses rr_OtherExpensesOverAssets 0.65%
Total annual fund operating expenses rr_ExpensesOverAssets 1.04%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.49%) [2],[3],[4]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.55% [2],[4]
1 year rr_ExpenseExampleYear01 $ 56
3 years rr_ExpenseExampleYear03 282
5 years rr_ExpenseExampleYear05 526
10 years rr_ExpenseExampleYear10 $ 1,227
2008 rr_AnnualReturn2008 1.74%
2009 rr_AnnualReturn2009 0.15%
2010 rr_AnnualReturn2010 0.01%
2011 rr_AnnualReturn2011 0.01%
2012 rr_AnnualReturn2012 0.01%
2013 rr_AnnualReturn2013 0.01%
2014 rr_AnnualReturn2014 0.01%
2015 rr_AnnualReturn2015 0.01%
2016 rr_AnnualReturn2016 0.04%
2017 rr_AnnualReturn2017 0.30%
Year to Date Return, Label rr_YearToDateReturnLabel The fund’s return for the three months ended
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.17%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2008
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.51%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
1 Year rr_AverageAnnualReturnYear01 0.30%
5 Years rr_AverageAnnualReturnYear05 0.07%
10 Years rr_AverageAnnualReturnYear10 0.23%
Inception date rr_AverageAnnualReturnInceptionDate Aug. 28, 1986
T. Rowe Price New York Tax-Free Money Fund | I Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee
Management fees rr_ManagementFeesOverAssets 0.39% [2]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets
Other expenses rr_OtherExpensesOverAssets 0.72% [5]
Total annual fund operating expenses rr_ExpensesOverAssets 1.11%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.78%) [2],[3],[5]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.33% [2],[5]
1 year rr_ExpenseExampleYear01 $ 34
3 years rr_ExpenseExampleYear03 275
5 years rr_ExpenseExampleYear05 536
10 years rr_ExpenseExampleYear10 $ 1,282
1 Year rr_AverageAnnualReturnYear01
5 Years rr_AverageAnnualReturnYear05
10 Years rr_AverageAnnualReturnYear10
Inception date rr_AverageAnnualReturnInceptionDate Jul. 06, 2017
T. Rowe Price New York Tax-Free Money Fund | Lipper New York Tax-Exempt Money Market Funds Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.35%
5 Years rr_AverageAnnualReturnYear05 0.10%
10 Years rr_AverageAnnualReturnYear10 0.24%
[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.
[2] T. Rowe Price Associates, Inc., has agreed (through June 30, 2019) to waive a portion of its management fee in order to limit the fund’s management fee to 0.28% of the fund’s average daily net assets. The agreement may be terminated at any time beyond June 30, 2019, with approval by the fund’s Board of Directors. Fees waived under this agreement are not subject to reimbursement to T. Rowe Price Associates, Inc., by the fund.
[3] As a result of class-specific expense limitations, T. Rowe Price Associates, Inc. waived fund-level expenses ratably across all classes.
[4] T. Rowe Price Associates, Inc., has agreed (through June 30, 2019) to waive its fees and/or bear any expenses (excluding interest; expenses related to borrowings, taxes, and brokerage; nonrecurring, extraordinary expenses; and acquired fund fees and expenses) that would cause the class’ ratio of expenses to average daily net assets to exceed 0.55%. The agreement may be terminated at any time beyond June 30, 2019, with approval by the fund’s Board of Directors. Fees waived and expenses paid under this agreement (and a previous limitation of 0.55%) are subject to reimbursement to T. Rowe Price Associates, Inc., by the fund whenever the class’ expense ratio is below 0.55%. However, no reimbursement will be made more than three years from the date such amounts were initially waived or reimbursed. The fund may only make repayments to T. Rowe Price Associates, Inc., if such repayment does not cause the class’ expense ratio (after the repayment is taken into account) to exceed both: (1) the expense limitation in place at the time such amounts were waived; and (2) the class’ current expense limitation.
[5] T. Rowe Price Associates, Inc., has agreed (through June 30, 2019) to pay the operating expenses of the fund's I Class excluding management fees; interest; expenses related to borrowings, taxes, and brokerage; nonrecurring, extraordinary expenses; and acquired fund fees and expenses ("I Class Operating Expenses"), to the extent the I Class Operating Expenses exceed 0.05% of the class' average daily net assets. Any expenses paid under this agreement are subject to reimbursement to T. Rowe Price Associates, Inc., by the fund whenever the fund's I Class Operating Expenses are below 0.05%. However, no reimbursement will be made more than three years from the date such amounts were initially waived or reimbursed. The fund may only make repayments to T. Rowe Price Associates, Inc., if such repayment does not cause the I Class Operating Expenses (after the repayment is taken into account) to exceed both: (1) the limitation on I Class Operating Expenses in place at the time such amounts were waived; and (2) the current expense limitation on I Class Operating Expenses.