v3.25.2
Shareholder Report
12 Months Ended
May 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name T. ROWE PRICE SHORT-TERM BOND FUND, INC.
Entity Central Index Key 0000731890
Entity Investment Company Type N-1A
Document Period End Date May 31, 2025
C000222038  
Shareholder Report [Line Items]  
Fund Name Short Duration Income Fund
Class Name Investor Class
Trading Symbol TSDLX
Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Short Duration Income Fund (the "fund") for the period of June 1, 2024 to May 31, 2025. 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. 

Shareholder Report Annual or Semi-Annual Annual Shareholder Report
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 <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@troweprice.com</span>
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)

 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Short Duration Income Fund - Investor Class
$41
0.40%
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.40%
Factors Affecting Performance [Text Block]

What drove fund performance during the past 12 months?

  • The shorter-maturity U.S. investment-grade bond market generated positive returns over the year ended May 31, 2025, as front-end yields fell amid elevated rate volatility, driven by heightened trade policy uncertainty and fiscal policy concerns near the end of the period.

  • The fund’s out-of-benchmark allocations to asset-backed securities (ABS), non-agency mortgage-backed securities, commercial mortgage-backed securities, and collateralized loan obligations aided performance relative to its style-specific benchmark, the Bloomberg US Corporate 1-3 Yr Total Return Index Value. Security selection within the investment-grade and high yield corporate sectors also aided results versus the style-specific index.

  • Interest rate management did not meaningfully impact performance over the period. The Short Duration Income Fund seeks to provide income consistent with limited fluctuation in principal value and liquidity. The fund’s allocation to investment-grade corporate bonds increased over the reporting period and continued to represent its largest absolute position. The fund’s allocation to U.S. Treasuries and ABS decreased relative to the style-specific index.

  • While we are primarily a cash bond manager, we occasionally employ the limited use of derivatives in our strategy for hedging purposes. The use of derivatives may include futures and options, as well as credit default and interest rate swaps.

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
Regulatory Benchmark
Strategy Benchmark
12/8/20
10,000
10,000
10,000
2/28/21
10,083
9,822
10,028
5/31/21
10,121
9,808
10,056
8/31/21
10,162
9,968
10,063
11/30/21
10,091
9,909
10,005
2/28/22
9,951
9,562
9,876
5/31/22
9,753
9,002
9,756
8/31/22
9,637
8,820
9,678
11/30/22
9,544
8,636
9,651
2/28/23
9,659
8,633
9,708
5/31/23
9,779
8,809
9,831
8/31/23
9,865
8,715
9,908
11/30/23
10,013
8,738
10,070
2/29/24
10,209
8,920
10,231
5/31/24
10,332
8,924
10,343
8/31/24
10,626
9,351
10,626
11/30/24
10,723
9,339
10,723
2/28/25
10,915
9,438
10,871
5/31/25
11,026
9,411
10,999
Average Annual Return [Table Text Block]
 
1 Year
Since Inception 12/8/20
Short Duration Income Fund (Investor Class)
6.71%
2.21%
Bloomberg U.S. Aggregate Bond Index (Regulatory Benchmark)
5.46
-1.35
Bloomberg 1-3 Year U.S. Corporate Bond Index (Strategy Benchmark)
6.33
2.15
Performance Inception Date Dec. 08, 2020
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 $ 97,143,000
Holdings Count | Holding 543
Advisory Fees Paid, Amount $ (139,000)
InvestmentCompanyPortfolioTurnover 90.80%
Additional Fund Statistics Significance or Limits [Text Block]

What are some fund statistics?

Fund Statistics

  • Total Net Assets (000s)$97,143
  • Number of Portfolio Holdings543
Holdings [Text Block]
Corporate Bonds
40.0%
Asset-Backed Securities
24.8
U.S. Government Agency Obligations (Excluding Mortgage-Backed)
13.6
Non-U.S. Government Mortgage-Backed Securities
7.4
U.S. Government & Agency Mortgage-Backed Securities
7.2
Commercial Paper
2.4
Foreign Government Obligations & Municipalities
2.1
Bank Loans
1.1
Short-Term and Other
1.4
Largest Holdings [Text Block]
U.S. Treasury Notes
12.6%
Federal National Mortgage Assn.
4.2
Federal Home Loan Mortgage
2.1
U.S. Treasury Inflation-Indexed Notes
1.0
Progress Residential
0.9
General Motors Financial
0.8
Barclays
0.8
Societe Generale
0.7
Wells Fargo
0.7
SMB Private Education Loan Trust
0.7
Material Fund Change [Text Block]
Updated Prospectus Web Address www.troweprice.com/paperless
C000222039  
Shareholder Report [Line Items]  
Fund Name Short Duration Income Fund
Class Name I Class
Trading Symbol TSIDX
Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about Short Duration Income Fund (the "fund") for the period of June 1, 2024 to May 31, 2025. 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. 

Shareholder Report Annual or Semi-Annual Annual Shareholder Report
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 <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify; text-align-last: left; white-space-collapse: preserve-breaks;">info@troweprice.com</span>
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)

 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Short Duration Income Fund - I Class
$30
0.29%
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.29%
Factors Affecting Performance [Text Block]

What drove fund performance during the past 12 months?

  • The shorter-maturity U.S. investment-grade bond market generated positive returns over the year ended May 31, 2025, as front-end yields fell amid elevated rate volatility, driven by heightened trade policy uncertainty and fiscal policy concerns near the end of the period.

  • The fund’s out-of-benchmark allocations to asset-backed securities (ABS), non-agency mortgage-backed securities, commercial mortgage-backed securities, and collateralized loan obligations aided performance relative to its style-specific benchmark, the Bloomberg US Corporate 1-3 Yr Total Return Index Value. Security selection within the investment-grade and high yield corporate sectors also aided results versus the style-specific index.

  • Interest rate management did not meaningfully impact performance over the period. The Short Duration Income Fund seeks to provide income consistent with limited fluctuation in principal value and liquidity. The fund’s allocation to investment-grade corporate bonds increased over the reporting period and continued to represent its largest absolute position. The fund’s allocation to U.S. Treasuries and ABS decreased relative to the style-specific index.

  • While we are primarily a cash bond manager, we occasionally employ the limited use of derivatives in our strategy for hedging purposes. The use of derivatives may include futures and options, as well as credit default and interest rate swaps.

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.
I Class
Regulatory Benchmark
Strategy Benchmark
12/8/20
500,000
500,000
500,000
2/28/21
504,292
491,107
501,375
5/31/21
506,334
490,403
502,782
8/31/21
508,512
498,419
503,129
11/30/21
505,104
495,429
500,247
2/28/22
498,217
478,121
493,805
5/31/22
488,450
450,082
487,789
8/31/22
482,725
441,022
483,898
11/30/22
478,221
431,818
482,548
2/28/23
484,094
431,639
485,408
5/31/23
489,706
440,437
491,543
8/31/23
494,685
435,759
495,415
11/30/23
502,230
436,913
503,510
2/29/24
512,176
446,000
511,526
5/31/24
518,523
446,187
517,174
8/31/24
533,377
467,555
531,289
11/30/24
538,419
466,951
536,130
2/28/25
547,611
471,905
543,566
5/31/25
553,908
470,544
549,931
Average Annual Return [Table Text Block]
 
1 Year
Since Inception 12/8/20
Short Duration Income Fund (I Class)
6.82%
2.31%
Bloomberg U.S. Aggregate Bond Index (Regulatory Benchmark)
5.46
-1.35
Bloomberg 1-3 Year U.S. Corporate Bond Index (Strategy Benchmark)
6.33
2.15
Performance Inception Date Dec. 08, 2020
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 $ 97,143,000
Holdings Count | Holding 543
Advisory Fees Paid, Amount $ (139,000)
InvestmentCompanyPortfolioTurnover 90.80%
Additional Fund Statistics Significance or Limits [Text Block]

What are some fund statistics?

Fund Statistics

  • Total Net Assets (000s)$97,143
  • Number of Portfolio Holdings543
Holdings [Text Block]
Corporate Bonds
40.0%
Asset-Backed Securities
24.8
U.S. Government Agency Obligations (Excluding Mortgage-Backed)
13.6
Non-U.S. Government Mortgage-Backed Securities
7.4
U.S. Government & Agency Mortgage-Backed Securities
7.2
Commercial Paper
2.4
Foreign Government Obligations & Municipalities
2.1
Bank Loans
1.1
Short-Term and Other
1.4
Largest Holdings [Text Block]
U.S. Treasury Notes
12.6%
Federal National Mortgage Assn.
4.2
Federal Home Loan Mortgage
2.1
U.S. Treasury Inflation-Indexed Notes
1.0
Progress Residential
0.9
General Motors Financial
0.8
Barclays
0.8
Societe Generale
0.7
Wells Fargo
0.7
SMB Private Education Loan Trust
0.7
Material Fund Change [Text Block]
Updated Prospectus Web Address www.troweprice.com/paperless