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Shareholder Report
 6 Months Ended
Jun. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name BNY Mellon Investment Funds III
Entity Central Index Key 0000053808
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
C000000790 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon High Yield Fund
Class Name Class A
Trading Symbol DPLTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon High Yield Fund (the “Fund”) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at bny.com/investments/literaturecenter. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website bny.com/investments/literaturecenter
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class A* $48 0.95%**
*
During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc.
**
Annualized.
Expenses Paid, Amount $ 48 [1]
Expense Ratio, Percent 0.95% [1],[2]
Net Assets $ 503,000,000
Holdings Count | Holding 318
Investment Company Portfolio Turnover 59.90%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 6/30/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$503 318 59.90%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 6/30/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
* Amount represents less than 0.1%.
C000000792 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon High Yield Fund
Class Name Class C
Trading Symbol PTHIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon High Yield Fund (the “Fund”) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at bny.com/investments/literaturecenter. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website bny.com/investments/literaturecenter
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class C* $86 1.70%**
*
During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc.
**
Annualized.
Expenses Paid, Amount $ 86 [3]
Expense Ratio, Percent 1.70% [3],[4]
Net Assets $ 503,000,000
Holdings Count | Holding 318
Investment Company Portfolio Turnover 59.90%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 6/30/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$503 318 59.90%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 6/30/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
* Amount represents less than 0.1%.
C000000793 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon High Yield Fund
Class Name Class I
Trading Symbol DLHRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon High Yield Fund (the “Fund”) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at bny.com/investments/literaturecenter. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website bny.com/investments/literaturecenter
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class I* $36 0.70%**
*
During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc.
**
Annualized.
Expenses Paid, Amount $ 36 [5]
Expense Ratio, Percent 0.70% [5],[6]
Net Assets $ 503,000,000
Holdings Count | Holding 318
Investment Company Portfolio Turnover 59.90%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 6/30/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$503 318 59.90%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 6/30/25 )
Sector Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
* Amount represents less than 0.1%.
[1] During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc.
[2] Annualized.
[3] During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc.
[4] Annualized.
[5] During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc.
[6] Annualized.