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T. Rowe Price Retirement Balanced I Fund-I Class (Prospectus Summary) | T. Rowe Price Retirement Balanced I Fund-I Class  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Retirement Balanced I Fund—I Class
Objective [Heading] rr_ObjectiveHeading Investment Objective(s)
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks the highest total return over time consistent with an emphasis on both capital growth and income.
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.
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 47.1% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 47.10%
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. 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 pursues its objective(s) by investing in a diversified portfolio of other T. Rowe Price stock and bond mutual funds that represent various asset classes and sectors. The fund is intended for retired investors who seek income and relative stability from bonds along with some capital appreciation potential from stocks. The fund’s “neutral allocations,” which are what T. Rowe Price considers broadly appropriate for investors during their retirement years, are 40% stock funds and 60% bond funds.

These allocations are intended to reflect the need for reduced market risks, lower portfolio volatility, and an income stream throughout retirement. Although the fund is designed for investors already in retirement, you should be aware that it does not decrease its equity holdings and become increasingly conservative over time. As such, you may want to consider a more conservative or more aggressive approach depending on your age and specific stage of retirement. The fund is designed to be part of an investor’s overall retirement strategy, but is not intended as a complete solution to an investor’s retirement needs. While the overall asset mix generally remains consistent over time, tactical decisions may be made by T. Rowe Price to overweight or underweight a particular asset class or sector based on its market outlook. The target allocations assigned to the broad asset classes (Stocks and Bonds), which reflect these tactical decisions resulting from market outlook, are not expected to vary from the neutral allocations by more than plus (+) or minus (-) five percent (5%).

The following table illustrates how the portfolio is generally expected to be allocated between the asset classes and the underlying T. Rowe Price mutual funds that are used to represent the broad asset classes and specific sectors. The fund invests in the Z Class of each of its underlying funds. T. Rowe Price is contractually obligated to waive and/or bear all of the Z Class’ expenses, with certain limited exceptions. The fund’s overall allocation to stocks is represented by a diversified mix of U.S. and international stock funds that employ both growth and value investment approaches and consist of large-cap, mid-cap, and small-cap stocks. The fund’s overall allocation to bonds is represented by a “core” fixed income component designed to have lower overall volatility and a “diversifying” fixed income component designed to respond to a variety of market conditions and improve risk adjusted returns. The information in the table represents the neutral allocations for the fund. The target allocations and actual allocations may differ. The fund’s shareholder reports set forth its actual allocations between stock funds and bond funds and to the individual T. Rowe Price mutual funds. T. Rowe Price may periodically rebalance or modify the asset mix of the underlying funds and change the underlying fund investments.

               

Retirement Balanced I Fund

Asset Class

  

Sector(s)

Neutral Allocation

Underlying Fund(s)

Stocks

40.00

%

U.S. Large-Cap Stocks

20.68

%

Equity Index 500, Growth Stock, U.S. Large-Cap Core, and/or Value
     

U.S. Mid-Cap Stocks

3.06

  

Mid-Cap Growth, Mid-Cap Index, and/or Mid-Cap Value
     

U.S. Small-Cap Stocks

2.86

  

New Horizons, Small-Cap Index, Small-Cap Stock, and/or Small-Cap Value
     

International Developed
Market Stocks

9.69

  

International Stock, International Value Equity, and/or Overseas Stock
     

International Emerging Market Stocks

1.71

  

Emerging Markets Discovery Stock and/or Emerging Markets Stock
     

Inflation Focused Stocks

2.00

  

Real Assets

Bonds

60.00

  

Core Fixed Income

23.10

  

Dynamic Global Bond, International Bond (USD Hedged), and/or New Income
     

Diversifying Fixed Income

36.90

  

Emerging Markets Bond, Floating Rate, High Yield, International Bond, Limited Duration Inflation Focused Bond, and/or U.S. Treasury Long-Term 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. There is no guarantee that the fund will provide adequate income at and through your retirement. The principal risks of investing in this fund, which may be even greater during periods of market disruption or volatility, are summarized as follows:

Asset allocation The fund’s overall level of risk will directly correspond to the risks of the underlying funds in which it invests. By investing in many underlying funds, the fund has partial exposure to the risks of different areas of the market. However, the selection of the underlying funds and the allocation of the fund’s assets among the various asset classes, market sectors, and investment styles represented by those underlying funds could cause the fund to underperform other funds with a similar benchmark or investment objective(s).

Investments in other funds The fund bears the risk that its underlying funds will fail to successfully employ their investment strategies. One or more underlying fund’s underperformance or failure to meet its investment objective(s) as intended could cause the fund to underperform similarly managed funds.

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 political or regulatory developments, recessions, inflation, rapid interest rate changes, war or 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. 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.

Bond exposure An underlying bond fund’s share price can fall because of various factors affecting bonds or due to general weakness in the overall bond markets. The fund invests in underlying funds with varying levels of credit risk, interest rate risk, and liquidity risk. At times, participants in bond markets may develop concerns about the ability of certain issuers 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 bond markets and the related derivatives markets, which could hamper an underlying fund’s ability to sell the bonds in which it invests or to find and purchase suitable investments.

Stock exposure An underlying stock fund’s share price can fall because of weakness in the overall stock markets, a particular industry, or specific holdings. Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising and falling prices. The value of an underlying stock fund may decline due to general weakness or volatility in the stock markets, adverse conditions impacting a particular industry or market sector, or factors affecting an investment style or market capitalization targeted by the fund.

International investing Investing in funds that hold the securities of non-U.S. issuers involves special risks not typically associated with investing in funds that hold securities of U.S. issuers. Non-U.S. securities tend to be more volatile and have lower overall liquidity than investments in U.S. securities and may lose value because of adverse local, political, social, or economic developments overseas, or due to changes in the exchange rates between foreign currencies and the U.S. dollar. In addition, investments outside the U.S. are subject to settlement practices and regulatory and financial reporting standards that differ from those of the U.S. The risks of investing outside the U.S. are heightened for any investments in emerging markets, which are susceptible to greater volatility than investments in developed markets.

Emerging markets Investing in funds that hold securities of issuers in emerging market countries involves greater risk and overall volatility than investing in funds that hold securities of issuers in the U.S. and developed markets. Emerging market countries tend to have economic structures that are less diverse and mature, and political systems that are less stable, than those of developed countries. In addition to the risks normally associated with investing outside the U.S., emerging markets are more susceptible to governmental interference, political and economic uncertainty, local taxes and restrictions on an underlying fund’s investments, less efficient trading markets with lower overall liquidity, and more volatile currency exchange rates.

Interest rates The prices of, and the income generated by, bonds and other debt instruments held by an underlying 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. Generally, underlying bond funds with longer weighted average maturities and durations carry greater interest rate risk.

Prepayments and extensions Underlying funds that invest in mortgage-backed securities, other asset-backed securities, or any debt instrument with an embedded call option are subject to prepayment risks because the principal on the security may be prepaid at any time, which could reduce the security’s yield and market value. The rate of prepayments tends to increase as interest rates fall, which could cause the average maturity of the underlying fund’s portfolio to shorten. Extension risk may result from a rise in interest rates, which tends to make mortgage-backed securities, asset-backed securities, and other callable debt instruments more volatile.

Credit quality An issuer of a debt instrument held by an underlying fund 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. The fund’s exposure to credit risk is increased to the extent the fund invests in underlying funds that hold securities that are not considered investment-grade. Holdings that are rated below investment grade carry greater risk of default and erratic price swings due, in part, to potentially adverse changes in the credit quality of the issuer.

Market capitalization Because the fund invests in certain funds that focus on a particular market capitalization, its share price may be negatively affected if investing in that market capitalization falls out of favor. Small- and mid-cap companies often have less experienced management, more limited financial resources, and less publicly available information than larger companies, and tend to be more sensitive to changes in overall economic conditions. As a result, investments in small-cap and mid-cap companies are likely to be more volatile than investments in larger companies. However, larger companies may not be able to attain the high growth rates of successful smaller companies, especially during strong economic periods, and they may be less capable of responding quickly to competitive challenges and industry changes.

Investment style Because the fund invests in certain funds that focus on growth stocks and certain funds that focus on value stocks, its share price may be negatively affected if either investing approach falls out of favor. Growth stocks tend to be more volatile than the overall

stock market and are more sensitive to changes in current or expected earnings. Value stocks carry the risk that investors will not recognize their intrinsic value for a long time or that they are actually appropriately priced at a low level.

Inflation To the extent the fund invests in underlying funds that are designed to provide protection against the impact of inflation, those investments could adversely affect the fund’s performance when inflation or expectations of inflation are low. During such periods, the values of an underlying fund’s investments in inflation-linked securities or stocks designed to outperform the overall stock market during periods of high or rising inflation could fall and result in losses for the fund, causing the fund to lag the performance of similarly managed funds.

Liquidity An underlying fund may not be able to meet requests to redeem shares without significant dilution of the remaining shareholders’ interest in the fund. A particular investment or an entire market segment may become less liquid or even illiquid, sometimes abruptly, which could limit a fund’s ability to purchase or sell holdings in a timely manner at a desired price. Reduced liquidity can result from a number of events, such as limited trading activity, reductions in bond inventory, and rapid or unexpected changes in interest rates. Large redemptions may also have a negative impact on an underlying fund’s overall liquidity.

Cybersecurity breaches The fund could be harmed by intentional cyber-attacks and other cybersecurity breaches, including unauthorized access to the fund’s assets, customer data and confidential shareholder 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.
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. The following table shows the average annual total returns for the fund, 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 6/30/20 was -0.46%.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
                 
   

Quarter Ended

Total Return

    

Quarter Ended

Total Return

  
 

Best Quarter

3/31/2019

6.72%

  

Worst Quarter

12/31/2018

-5.06%

  
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns Periods ended December 31, 2019
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 Narrative rr_PerformanceTableNarrativeTextBlock

The following table shows the average annual total returns for the fund, 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.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com.
T. Rowe Price Retirement Balanced I Fund-I Class (Prospectus Summary) | T. Rowe Price Retirement Balanced I Fund-I Class | S&P Target Date Retirement Income Index  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P Target Date Retirement Income Index (reflects no deduction for fees, expenses, or taxes)
T. Rowe Price Retirement Balanced I Fund-I Class (Prospectus Summary) | T. Rowe Price Retirement Balanced I Fund-I Class | S&P Target Date Retirement Income Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 13.33%
Since Inception rr_AverageAnnualReturnSinceInception 5.99% [1]
T. Rowe Price Retirement Balanced I Fund-I Class (Prospectus Summary) | T. Rowe Price Retirement Balanced I Fund-I Class | Combined Index Portfolio Net  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Combined Index Portfolio Net (reflects no deduction for fees or expenses) [2]
T. Rowe Price Retirement Balanced I Fund-I Class (Prospectus Summary) | T. Rowe Price Retirement Balanced I Fund-I Class | Combined Index Portfolio Net  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.20%
Since Inception rr_AverageAnnualReturnSinceInception 7.11% [1]
T. Rowe Price Retirement Balanced I Fund-I Class (Prospectus Summary) | T. Rowe Price Retirement Balanced I Fund-I Class | Retirement Balanced I Fund—I Class  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.35% [3]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets none [3]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets none [3]
Total annual fund operating expenses rr_ExpensesOverAssets 0.35% [3]
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect current fees.
1 Year rr_ExpenseExampleYear01 $ 35
3 Years rr_ExpenseExampleYear03 111
5 Years rr_ExpenseExampleYear05 194
10 Years rr_ExpenseExampleYear10 $ 438
Annual Return 2016 rr_AnnualReturn2016 6.44%
Annual Return 2017 rr_AnnualReturn2017 10.52%
Annual Return 2018 rr_AnnualReturn2018 (3.25%)
Annual Return 2019 rr_AnnualReturn2019 15.45%
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, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (0.46%)
Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.72%
Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.06%)
1 Year rr_AverageAnnualReturnYear01 15.45%
Since Inception rr_AverageAnnualReturnSinceInception 7.28%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 29, 2015
T. Rowe Price Retirement Balanced I Fund-I Class (Prospectus Summary) | T. Rowe Price Retirement Balanced I Fund-I Class | Retirement Balanced I Fund—I Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 14.27%
Since Inception rr_AverageAnnualReturnSinceInception 6.16%
T. Rowe Price Retirement Balanced I Fund-I Class (Prospectus Summary) | T. Rowe Price Retirement Balanced I Fund-I Class | Retirement Balanced I Fund—I Class | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.41%
Since Inception rr_AverageAnnualReturnSinceInception 5.29%
[1] Return since 9/29/15.
[2] Combined Index Portfolio Net is a blended benchmark composed of 40.0% stocks (28.00% Russell 3000 Index and 12.00% MSCI All Country World Index ex USA Net), and 60.0% bonds (31.00% Bloomberg Barclays U.S. Aggregate Bond Index and 29.00% Bloomberg Barclays U.S. 1-5 Year Treasury Inflation Protected Securities (TIPS) Index). The indices and percentages may vary over time.
[3] Restated to reflect current fees.