This annual shareholder report contains important information about Retirement Blend 2055 Fund (the "fund") for the period of June 1, 2025 to May 31, 2026.

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 atwww.troweprice.com/prospectus. You can also request this information without charge by contacting T. Rowe Price at 1‑800‑638‑5660 or info@troweprice.com or contacting your intermediary.

Material Fund Change Notice [Text Block]

Additional Information Phone Number

1‑800‑638‑5660

Additional Information Email

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Additional Information Website

www.troweprice.com/prospectus

Expenses [Text Block]

What were the fund costs for the last year? (based on a hypothetical $10,000 investment)

Table Summary
	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Retirement Blend 2055 Fund - Investor Class	$49	0.43%

Expenses Paid, Amount

$ 49

Expense Ratio, Percent

0.43%

Factors Affecting Performance [Text Block]

What drove fund performance during the past 12 months?

Global stock indexes and fixed income markets generated strong returns for the 12 months ended May 31, 2026. Equities were supported by solid corporate earnings, enthusiasm for artificial intelligence and semiconductor-related investments, and periods of easing monetary policy as major central banks, including the Federal Reserve, reduced interest rates in late 2025. Despite volatility from shifting U.S. tariff policies and the U.S.-Iran conflict, markets recovered as ceasefire progress reduced energy-price pressures and improved investor sentiment, while fixed income benefited from declining yields, resilient credit markets, and easing geopolitical risks.
Compared with the style-specific S&P Target Date 2055 Index, glide path effect contributed to results for the period. Despite bouts of volatility, global equity markets advanced significantly over the year, and the fund’s greater total equity exposure versus the benchmark was beneficial. Additionally, an overweight allocation to emerging markets equities, which strongly outpaced international developed markets, had a positive impact on relative results.
Conversely, security selection within some of the underlying portfolios detracted from relative results, including allocations to U.S. large-cap value and growth stocks.
The fund seeks the highest total return over time consistent with an emphasis on both capital growth and income. The fund invests in a diversified portfolio of other T. Rowe Price stock and bond mutual funds that represent various asset classes and sectors. Its allocation among T. Rowe Price funds will change over time in relation to its target retirement date.

Performance Past Does Not Indicate Future [Text]

The fund’s past performance is not a good predictor of the fund’s future performance.

Line Graph [Table Text Block]

A line chart as described in the following paragraph.

Investor Class 15,798
Regulatory Benchmark 17,530
Strategy Benchmark 16,117

Table Summary
	Investor Class	Regulatory Benchmark	Strategy Benchmark
7/26/21	10,000	10,000	10,000
8/31/21	10,220	10,233	10,224
11/30/21	10,030	10,276	10,056
2/28/22	9,586	9,799	9,779
5/31/22	8,984	9,197	9,267
8/31/22	8,504	8,874	8,780
11/30/22	8,851	9,166	9,109
2/28/23	8,829	9,008	9,179
5/31/23	9,037	9,384	9,336
8/31/23	9,639	10,183	9,909
11/30/23	9,723	10,322	10,002
2/29/24	10,703	11,585	10,922
5/31/24	11,104	11,972	11,302
8/31/24	11,758	12,846	11,995
11/30/24	12,232	13,881	12,362
2/28/25	12,137	13,616	12,326
5/31/25	12,319	13,543	12,614
8/31/25	13,316	14,881	13,623
11/30/25	14,034	15,767	14,311
2/28/26	14,975	15,933	15,185
5/31/26	15,798	17,530	16,117

Average Annual Return [Table Text Block]

Table Summary
	1 Year	Since Inception 7/26/21
Retirement Blend 2055 Fund (Investor Class)	28.24%	9.89%
Russell 3000 Index (Regulatory Benchmark)	29.45	12.28
S&P Target Date 2055 Index (Strategy Benchmark)	27.78	10.35

Performance Inception Date

Jul. 26, 2021

No Deduction of Taxes [Text Block]

Neither the fund’s returns nor the index returns reflect the deduction of taxes that a shareholder would pay on fund distributions or redemptions of fund shares.

Updated Performance Information Location [Text Block]

Updated performance information can be found at www.troweprice.com.

Distribution of Capital [Text Block]

The fund's total return figures reflect the reinvestment of dividends and capital gains, if any.

AssetsNet

$ 948,024,000

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,336,000

InvestmentCompanyPortfolioTurnover

14.90%

Additional Fund Statistics Significance or Limits [Text Block]

What are some fund statistics?

Fund Statistics

Total Net Assets (000s)$948,024
Number of Portfolio Holdings21

Holdings [Text Block]

Table Summary
Domestic Equity Funds	69.2%
International Equity Funds	28.6
Domestic Bond Funds	1.5
International Bond Funds	0.3
Short-Term and Other	0.4

Largest Holdings [Text Block]

Table Summary
T. Rowe Price Equity Index 500 Fund	28.9%
T. Rowe Price International Equity Index Fund	13.9
T. Rowe Price Growth Stock Fund	11.8
T. Rowe Price Value Fund	11.3
T. Rowe Price Real Assets Fund	5.9
T. Rowe Price International Value Equity Fund	4.9
T. Rowe Price International Stock Fund	3.4
T. Rowe Price Emerging Markets Discovery Stock Fund	3.3
T. Rowe Price Emerging Markets Stock Fund	3.1
T. Rowe Price Mid-Cap Index Fund	3.0

Material Fund Change [Text Block]

Updated Prospectus Web Address

www.troweprice.com/paperless

C000222696

Shareholder Report [Line Items]

Fund Name

Retirement Blend 2055 Fund

Class Name

I Class

Trading Symbol

TBLMX

Annual or Semi-Annual Statement [Text Block]