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T. Rowe Price Tax-Free Short-Intermediate Fund, Inc.  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Supplement to Prospectus and Summary Prospectus dated May 1, 2024

Effective November 1, 2024, the fee table and expense example in the Summary Prospectus and Section 1 of the Prospectus are revised as follows:
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, hold, and sell shares of the fund. The fees and expenses below are annualized based on the fees and expenses for the six month period ended August 31, 2024. You may also incur brokerage commissions and other charges when buying or selling shares of the fund, which are not reflected in the table or example below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption 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)
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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
T. Rowe Price Tax-Free Short-Intermediate Fund, Inc. | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee $ 20 [1]
Management fees rr_ManagementFeesOverAssets 0.20% [2]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.18%
Total annual fund operating expenses rr_ExpensesOverAssets 0.38%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect current fee.
1 Year rr_ExpenseExampleYear01 $ 39
3 Years rr_ExpenseExampleYear03 122
5 Years rr_ExpenseExampleYear05 213
10 Years rr_ExpenseExampleYear10 480
T. Rowe Price Tax-Free Short-Intermediate Fund, Inc. | I Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee none
Management fees rr_ManagementFeesOverAssets 0.20% [2]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.04%
Total annual fund operating expenses rr_ExpensesOverAssets 0.24%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect current fee.
1 Year rr_ExpenseExampleYear01 $ 25
3 Years rr_ExpenseExampleYear03 77
5 Years rr_ExpenseExampleYear05 135
10 Years rr_ExpenseExampleYear10 306
T. Rowe Price Tax-Free Short-Intermediate Fund, Inc. | Advisor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee none
Management fees rr_ManagementFeesOverAssets 0.20% [2]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.31%
Total annual fund operating expenses rr_ExpensesOverAssets 0.76%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect current fee.
1 Year rr_ExpenseExampleYear01 $ 78
3 Years rr_ExpenseExampleYear03 243
5 Years rr_ExpenseExampleYear05 422
10 Years rr_ExpenseExampleYear10 $ 942
[1]

Subject to certain exceptions and account minimums, accounts are charged an annual $20 fee.
[2]

Restated to reflect current fee.