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T. Rowe Price U.S. Limited Duration TIPS Index Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading U.S. Limited Duration TIPS Index Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective(s)
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks income by investing in inflation-linked securities.
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. 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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 169.1% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 169.10%
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 any current expense limitation arrangement remains in place for the period noted in the previous table; 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 Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The fund seeks to track the investment returns of the Index, the Bloomberg U.S. 1-5 Year Treasury TIPS Index (Index). Under normal conditions, the fund invests at least 80% of its net assets (including any borrowings for investment purposes) in Treasury Inflation Protected Securities and in securities that are held in the Index. For purposes of the fund’s 80% investment policies, the fund includes derivative instruments that are linked to, or provide investment exposure to, Treasury Inflation Protected Securities or securities held in the Index. The fund normally maintains a duration between one and five years, and it will vary consistent with the duration of the Index, which measures the performance of inflation protected securities issued by the U.S. Treasury with remaining maturities between one and five years. As of July 31, 2023, the duration of the Index was 2.74 years.

Duration, which is expressed in years, is a calculation that attempts to measure the price sensitivity of a bond or bond fund to changes in interest rates. The longer a bond fund’s duration, the more sensitive that fund should be to changes in interest rates. For example, if

interest rates rise by 1% and a fixed-rate bond has a duration of 5 years, it is estimated that the principal value of the bond will decrease by approximately 5%.

To be eligible for inclusion in the Index, a security must be rated investment grade, its principal and interest must be inflation-linked and denominated in U.S. dollars, have a fixed rate coupon with at least $250 million par amount outstanding (not adjusted for inflation indexation), and have greater than one year and less than five years remaining to maturity. The Index is market value weighted and the securities represented in the Index are updated on the last business day of each month. The composition of the Index is rebalanced at each month-end and represents the fixed set of securities on which Index returns are calculated for the next month. As of July 31, 2023, there were 21 securities in the Index.

The adviser does not attempt to fully replicate the Index for the fund by holding each of the bonds represented in the Index. The portfolio will be structured to maintain an investment and risk profile, and overall characteristics, similar to the Index. Using a sampling of securities, the adviser seeks to closely track the returns of the Index and more efficiently replicate the key risk factors of the Index (such as maturity, duration, and credit quality) by attempting to capitalize on market inefficiencies through structural portfolio positioning and making small tactical bets on inflation, duration, and yield curve positioning.

Treasury Inflation Protected Securities, known as TIPS, are instruments issued by the U.S. Treasury that are structured to provide protection against inflation, which measures a sustained increase in the prices of goods and services in an economy that can erode the purchasing power of a currency over time. Interest and principal payments of TIPS are periodically adjusted in step with changes in the inflation rate. These inflation adjustments for TIPS are applied based on changes in the Consumer Price Index (CPI), while inflation adjustments for other types of inflation-linked securities may be based on a different inflation index. Inflation-linked securities tend to react to changes in real interest rates, which represent nominal (stated) interest rates reduced by the expected impact of inflation. For example, if a 3-year Treasury bond is yielding 5% and inflation expectations for the next 3 years are 2%, the real interest rate is 3%.

The fund will only purchase securities that are rated within the four highest credit rating categories (AAA, AA, A, BBB, or equivalent) at the time of purchase by at least one major credit rating agency or, if unrated, deemed by T. Rowe Price to be of comparable quality.

The fund may use a variety of derivatives, such as futures, options, foreign exchange currency contracts (forwards), and swaps for a number of purposes, such as for exposure or hedging. Specifically, the fund uses interest rate futures and interest rate future options, forwards, credit default swaps, and CPI swaps or other inflation swaps. Interest rate derivatives would typically be used to manage the fund’s exposure to interest rate changes or to adjust portfolio duration. Forwards would typically be used to protect any non-U.S. dollar denominated holdings from adverse currency movements, to increase or decrease exposure to a particular foreign currency, or to enhance the fund’s returns by gaining exposure to certain currencies expected to increase or decrease in value relative to other currencies. Credit default swaps would typically be used to protect the value of certain portfolio holdings or to manage the fund’s overall exposure to

changes in credit quality. CPI swaps, which are derivatives pegged directly to the rate of inflation, would typically be used to manage the fund’s inflation risk, maintain efficient exposure to TIPS and other inflation-linked securities, or help realign the portfolio with the overall characteristics of the Index.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

As with any fund, there is no guarantee that the fund will achieve its objective(s). The fund’s share price fluctuates, which means you could lose money by investing in the fund. The principal risks of investing in this fund, which may be even greater in bad or uncertain market conditions, are summarized as follows:

Fixed income markets: Economic and other market developments can adversely affect the fixed income securities markets. At times, participants in these markets may develop concerns about the ability of certain issuers of debt instruments to make timely principal and interest payments, or they may develop concerns about the ability of financial institutions that make markets in certain debt instruments to facilitate an orderly market. Those concerns could cause increased volatility and reduced liquidity in particular securities or in the overall fixed income markets and the related derivatives markets. A lack of liquidity or other adverse credit market conditions may hamper the fund’s ability to sell the debt instruments in which it invests or to find and purchase suitable debt instruments.

Inflation-linked securities: In general, the value of an inflation-linked security, including TIPS, will typically decrease when real interest rates (nominal interest rates reduced by the expected impact of inflation) increase and increase when real interest rates decrease. When inflation is negative or concerns over inflation are low, the value and income of inflation-linked securities could fall and result in losses for the fund and during periods of very low inflation, the yield on an inflation-linked security may be negative. Conversely, during sustained periods of high inflation, the fund’s yield should increase, which may not be repeated. Funds that invest heavily in inflation-linked securities do not always move in lockstep with inflation because they do not necessarily buy inflation-linked securities when they are originally issued or hold them until maturity. In addition, the accrual of inflation adjustments on the fund’s holdings may significantly impact the current level of dividends actually paid to shareholders. Changes in inflation rates and/or interest rates may cause the fund’s yield to vary substantially over time.

Market conditions: The value of the fund’s investments may decrease, sometimes rapidly or unexpectedly, due to factors affecting an issuer held by the fund, particular industries, or the overall securities markets. A variety of factors can increase the volatility of the fund’s holdings and markets generally, including economic, political, or regulatory developments, recessions, inflation, rapid interest rate changes, war, military conflict, acts of terrorism, natural disasters, and outbreaks of infectious illnesses or other widespread public health issues such as the coronavirus pandemic and related governmental and public responses (including sanctions). Certain events may cause instability across global markets, including reduced liquidity and disruptions in trading markets, while some events may affect certain geographic regions, countries, sectors, and industries more significantly than others. Government intervention in markets may impact interest rates, market volatility, and security pricing. These adverse

developments may cause broad declines in market value due to short-term market movements or for significantly longer periods during more prolonged market downturns.

Index investing: Because the fund is managed to track the performance of its benchmark index, holdings are generally not reallocated based on changes in market conditions or the outlook for inflation, interest rates, and inflation-linked securities.

Tracking error: The returns of the fund may deviate from the returns of its benchmark index (referred to as “tracking error”) because the fund incurs fees and transaction expenses while the index has no fees or expenses. Increased tracking error could also result from changes in the composition of the index or the timing of purchases and redemptions of fund shares. The fund does not attempt to fully replicate its benchmark index, which increases the potential for the fund’s performance to deviate from that of its index.

Interest rates: The prices of, and the income generated by, debt instruments held by the fund may be affected by changes in interest rates. A rise in interest rates typically causes the price of a fixed rate debt instrument to fall and its yield to rise. Conversely, a decline in interest rates typically causes the price of a fixed rate debt instrument to rise and the yield to fall. The prices and yields of inflation-linked bonds are directly impacted by the rate of inflation as well as changes in interest rates. Generally, funds with longer weighted average maturities and durations carry greater interest rate risk. Changes in monetary policy made by central banks and/or governments, such as the discontinuation and replacement of benchmark rates, are likely to affect the interest rates or yields of the securities in which the fund invests.

Derivatives: The use of derivatives exposes the fund to additional volatility and potential losses. A derivative involves risks different from, and possibly greater than, the risks associated with investing directly in the assets on which the derivative is based, including liquidity risk, valuation risk, correlation risk, market risk, interest rate risk, leverage risk, counterparty and credit risk, operational risk, management risk, legal risk, and regulatory risk. Derivatives can be highly volatile, illiquid, and difficult to value, and changes in the value of a derivative may not properly correlate with changes in the value of the underlying asset, reference rate, or index. The fund could be exposed to significant losses if it is unable to close a derivatives position due to the lack of a liquid secondary trading market. The prices of derivatives may move in unexpected ways, especially in abnormal market conditions. Certain derivatives are also subject to counterparty risk, which is the risk that the derivative counterparty will not fulfill its contractual obligations. The use of derivatives includes the risk of potential operational issues, such as settlement issues. Derivatives are exposed to legal risks, such as the legality or enforceability of a contract. The adviser may not be able to accurately predict the direction of prices, economic factors, or other associated risks which could cause loss in value or impair the fund’s efforts to reduce overall volatility. New regulations may make derivatives more costly, limit availability, or otherwise affect their value or performance.

Credit quality: An issuer of a debt instrument could suffer an adverse change in financial condition that results in a payment default (failure to make scheduled interest or principal payments), rating downgrade, or inability to meet a financial obligation. Securities that are

rated below investment grade carry greater risk of default and should be considered speculative.

Liquidity: The fund may not be able to meet requests to redeem shares issued by the fund without significant dilution of the remaining shareholders’ interests in the fund. In addition, the fund may not be able to sell a holding in a timely manner at a desired price. Reduced liquidity in the bond markets can result from a number of events, such as limited trading activity, reductions in bond inventory, and rapid or unexpected changes in interest rates. Markets with lower overall liquidity could lead to greater price volatility and limit the fund’s ability to sell a holding at a suitable price.

Portfolio turnover: High portfolio turnover may adversely affect the fund’s performance and increase transaction costs, which could increase the fund’s expenses. High portfolio turnover may also result in the distribution of higher capital gains when compared with a fund with less active trading policies, which could have an adverse tax impact if the fund’s shares are held in a taxable account.

Cybersecurity breaches: The fund could be harmed by intentional cyberattacks and other cybersecurity breaches, including unauthorized access to the fund’s assets, confidential information, or other proprietary information. In addition, a cybersecurity breach could cause one of the fund’s service providers or financial intermediaries to suffer unauthorized data access, data corruption, or loss of operational functionality.
Risk Lose Money [Text] rr_RiskLoseMoney The fund’s share price fluctuates, which means you could lose money by investing in the fund.
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 (before and after taxes) 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 relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund, if applicable.
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 (before and after taxes) and is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Returns
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock

The fund’s return for the six months ended 6/30/23 was 0.55%.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
         
  

Quarter Ended

Total Return

  

Quarter Ended

Total Return

 
 

Best Quarter

6/30/21

1.56%

 

Worst Quarter

9/30/22

-3.71%

 
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns Periods ended December 31, 2022
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or an IRA.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for the Investor Class and will differ for other share classes.
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 relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund, if applicable.

In addition, the table shows hypothetical after-tax returns to demonstrate how taxes paid by a shareholder may influence returns. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or an IRA. After-tax returns are shown only for the Investor Class and will differ for other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

Updated performance information is available through troweprice.com.
T. Rowe Price U.S. Limited Duration TIPS Index Fund | Bloomberg U.S. 1-5 Year Treasury TIPS Index  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes reflects no deduction for fees, expenses, or taxes
Label rr_AverageAnnualReturnLabel Bloomberg U.S. 1-5 Year Treasury TIPS Index (reflects no deduction for fees, expenses, or taxes)
T. Rowe Price U.S. Limited Duration TIPS Index Fund | Bloomberg U.S. 1-5 Year Treasury TIPS Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (3.96%)
Since Inception rr_AverageAnnualReturnSinceInception 1.39% [1]
T. Rowe Price U.S. Limited Duration TIPS Index Fund | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee $ 20 [2]
Management fees rr_ManagementFeesOverAssets 0.06%
Other expenses rr_OtherExpensesOverAssets 0.27%
Total annual fund operating expenses rr_ExpensesOverAssets 0.33%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [3]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.21% [3]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination September 30, 2024
1 Year rr_ExpenseExampleYear01 $ 22
3 Years rr_ExpenseExampleYear03 94
5 Years rr_ExpenseExampleYear05 173
10 Years rr_ExpenseExampleYear10 $ 406
Annual Return 2021 rr_AnnualReturn2021 4.98%
Annual Return 2022 rr_AnnualReturn2022 (5.04%)
Year to Date Return, Label rr_YearToDateReturnLabel The fund’s return for the six months ended
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2023
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.55%
Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2021
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.56%
Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.71%)
1 Year rr_AverageAnnualReturnYear01 (5.04%)
Since Inception rr_AverageAnnualReturnSinceInception 0.59%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 02, 2020
T. Rowe Price U.S. Limited Duration TIPS Index Fund | Investor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (7.32%)
Since Inception rr_AverageAnnualReturnSinceInception (1.28%)
T. Rowe Price U.S. Limited Duration TIPS Index Fund | Investor Class | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.98%)
Since Inception rr_AverageAnnualReturnSinceInception (0.29%)
T. Rowe Price U.S. Limited Duration TIPS Index Fund | I Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee none
Management fees rr_ManagementFeesOverAssets 0.06%
Other expenses rr_OtherExpensesOverAssets 0.07% [4]
Total annual fund operating expenses rr_ExpensesOverAssets 0.13%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [4]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets 0.11% [4]
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination September 30, 2024
1 Year rr_ExpenseExampleYear01 $ 11
3 Years rr_ExpenseExampleYear03 40
5 Years rr_ExpenseExampleYear05 71
10 Years rr_ExpenseExampleYear10 $ 164
1 Year rr_AverageAnnualReturnYear01 (4.90%)
Since Inception rr_AverageAnnualReturnSinceInception 0.69%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 02, 2020
T. Rowe Price U.S. Limited Duration TIPS Index Fund | Z Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum account fee rr_MaximumAccountFee none
Management fees rr_ManagementFeesOverAssets 0.06%
Other expenses rr_OtherExpensesOverAssets 0.02%
Total annual fund operating expenses rr_ExpensesOverAssets 0.08%
Fee waiver/expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [5]
Total annual fund operating expenses after fee waiver/expense reimbursement rr_NetExpensesOverAssets none [5]
1 Year rr_ExpenseExampleYear01 none
3 Years rr_ExpenseExampleYear03 none
5 Years rr_ExpenseExampleYear05 none
10 Years rr_ExpenseExampleYear10 none
1 Year rr_AverageAnnualReturnYear01 (4.87%)
Since Inception rr_AverageAnnualReturnSinceInception 0.78%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 02, 2020
[1] Return since 11/2/20.
[2]

Subject to certain exceptions and account minimums, accounts are charged an annual $20 fee.
[3]

T. Rowe Price Associates, Inc., has contractually agreed (through September 30, 2024) 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 0.21%. The agreement may only be terminated at any time after September 30, 2024, with approval by the fund’s Board of Directors. Fees waived and expenses paid under this agreement (and any applicable prior limitations) are subject to reimbursement to T. Rowe Price Associates, Inc., by the class whenever the class’ expense ratio is below 0.21%. However, the class will not reimburse T. Rowe Price Associates, Inc., more than three years from the date such amounts were initially waived or paid. The class may only reimburse T. Rowe Price Associates, Inc., if the reimbursement does not cause the class’ expense ratio (after the reimbursement is taken into account) to exceed the class’ current expense limitation (or the expense limitation in place at the time the amounts were waived or paid).
[4]

T. Rowe Price Associates, Inc., has contractually agreed (through September 30, 2024) 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. The agreement may only be terminated at any time after September 30, 2024, with approval by the fund’s Board of Directors. Any expenses paid under this agreement (and any applicable prior limitations) are subject to reimbursement to T. Rowe Price Associates, Inc., by the class whenever the I Class Operating Expenses are below 0.05%. However, the class will not reimburse T. Rowe Price Associates, Inc., more than three years from the date such amounts were initially waived or paid. The class may only reimburse T. Rowe Price Associates, Inc., if the reimbursement does not cause the I Class Operating Expenses (after the reimbursement is taken into account) to exceed the current expense limitation on I Class Operating Expenses (or the expense limitation in place at the time the amounts were waived or paid).
[5]

T. Rowe Price Associates, Inc., has contractually agreed to waive and/or bear all the Z Class’ expenses (excluding interest; expenses related to borrowings, taxes, and brokerage; nonrecurring, extraordinary expenses; and acquired fund fees and expenses) in their entirety. T. Rowe Price Associates, Inc., expects this fee waiver and/or expense reimbursement arrangement to remain in place indefinitely, and the agreement may only be amended or terminated with approval by the fund’s Board of Directors.