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Shareholder Report
12 Months Ended
May 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
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 May 31, 2025
C000034167 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Equity Income Fund
Class Name Class A
Trading Symbol DQIAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BNY Mellon Equity Income Fund (the “Fund”) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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 year ?
(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 $108 1.02%
Expenses Paid, Amount $ 108
Expense Ratio, Percent 1.02%
Factors Affecting Performance [Text Block]
How did the Fund perform last year ?
  • For the 12-month period ended May 31, 2025, the Fund’s Class A shares returned 12.66%.
  • In comparison, the S&P 500® Index (the “Index”) returned 13.52% for the same period.
What affected the Fund’s performance?
  • U.S. equities were driven by large-cap technology gains, tariff-induced volatility, weak economic data and anticipation of possible U.S. Federal Reserve rate cuts.
  • Stock selection in the staples, health care and technology sectors contributed to the Fund’s performance relative to the Index.
  • The Fund’s emphasis on dividend-paying issues detracted from relative performance, particularly in the consumer discretionary sector.
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]
How did the Fund perform over the past 10 years?
The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance from June 1 , 2015 through May 31, 2025
Initial Investment of $10,000
Fund Performance - Growth of 10K Chart
The above graph compares a hypothetical $10,000 investment in the Fund’s Class A shares to a hypothetical investment of $10,000 made in the S&P 500® Index on 5/31/2015. The performance shown takes into account the maximum initial sales charge on Class A shares and applicable fees and expenses of the Fund, including management fees and other expenses. The Fund’s performance also assumes the reinvestment of dividends and capital gains. Unlike the Fund, the Index is not subject to charges, fees and other expenses. Investors cannot invest directly in any index.
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (AS OF 5/31/25 )
Class A Shares 1YR 5YR 10YR
with Maximum Sales Charge - 5.75% 6.20% 15.44% 10.43%
without Sales Charge 12.66% 16.82% 11.09%
S&P 500® Index 13.52% 15.94% 12.86%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block] For more current information visit  bny.com/investments/literaturecenter .
Net Assets $ 1,658,000,000
Holdings Count | Holding 102
Advisory Fees Paid, Amount $ 10,244,777
Investment Company Portfolio Turnover 28.38%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 5/31/25 )

Fund Size (Millions)

Number of Holdings
Total Advisory Fee Paid During
Period

Annual Portfolio Turnover
$1,658 102 $10,244,777 28.38%
Holdings [Text Block]
Portfolio Holdings (as of 5/31/25 )
Top Ten Holdings (Based on Net Assets) *
Graphical Representation - Top N Holdings Chart
* Excludes money market funds or other short-term securities held for the investment of cash and cash collateral for securities loaned, if any.
Sector Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
Largest Holdings [Text Block]
Top Ten Holdings (Based on Net Assets) *
Graphical Representation - Top N Holdings Chart
* Excludes money market funds or other short-term securities held for the investment of cash and cash collateral for securities loaned, if any.
C000034168 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Equity Income Fund
Class Name Class C
Trading Symbol DQICX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BNY Mellon Equity Income Fund (the “Fund”) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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 year ?
(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* $188 1.78%
*
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. If this agreement is not extended in the future, expenses could be higher.
Expenses Paid, Amount $ 188 [1]
Expense Ratio, Percent 1.78% [1]
Factors Affecting Performance [Text Block]
How did the Fund perform last year ?
  • For the 12-month period ended May 31, 2025, the Fund’s Class C shares returned 11.79%.
  • In comparison, the S&P 500® Index (the “Index”) returned 13.52% for the same period.
What affected the Fund’s performance?
  • U.S. equities were driven by large-cap technology gains, tariff-induced volatility, weak economic data and anticipation of possible U.S. Federal Reserve rate cuts.
  • Stock selection in the staples, health care and technology sectors contributed to the Fund’s performance relative to the Index.
  • The Fund’s emphasis on dividend-paying issues detracted from relative performance, particularly in the consumer discretionary sector.
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
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]
How did the Fund perform over the past 10 years?
The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance from June 1 , 2015 through May 31, 2025
Initial Investment of $10,000
Fund Performance - Growth of 10K Chart
The above graph compares a hypothetical $10,000 investment in the Fund’s Class C shares to a hypothetical investment of $10,000 made in the S&P 500® Index on 5/31/2015. The performance shown takes into account the maximum deferred sales charge on Class C shares and applicable fees and expenses of the Fund, including management fees, 12b-1 fees and other expenses. The Fund’s performance also assumes the reinvestment of dividends and capital gains. Unlike the Fund, the Index is not subject to charges, fees and other expenses. Investors cannot invest directly in any index.
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (AS OF 5/31/25 )
Class C Shares 1YR 5YR 10YR
with Maximum Deferred Sales Charge - 1.00% 10.79%
*
15.93% 10.25%
without Deferred Sales Charge 11.79% 15.93% 10.25%
S&P 500® Index 13.52% 15.94% 12.86%
*
The maximum contingent deferred sales charge for Class C shares is 1.00% for shares redeemed within one year of the date purchased.
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block] For more current information visit  bny.com/investments/literaturecenter .
Net Assets $ 1,658,000,000
Holdings Count | Holding 102
Advisory Fees Paid, Amount $ 10,244,777
Investment Company Portfolio Turnover 28.38%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 5/31/25 )

Fund Size (Millions)

Number of Holdings
Total Advisory Fee Paid During
Period

Annual Portfolio Turnover
$1,658 102 $10,244,777 28.38%
Holdings [Text Block]
Portfolio Holdings (as of 5/31/25 )
Top Ten Holdings (Based on Net Assets) *
Graphical Representation - Top N Holdings Chart
* Excludes money market funds or other short-term securities held for the investment of cash and cash collateral for securities loaned, if any.
Sector Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
Largest Holdings [Text Block]
Top Ten Holdings (Based on Net Assets) *
Graphical Representation - Top N Holdings Chart
* Excludes money market funds or other short-term securities held for the investment of cash and cash collateral for securities loaned, if any.
C000034169 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Equity Income Fund
Class Name Class I
Trading Symbol DQIRX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BNY Mellon Equity Income Fund (the “Fund”) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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 year ?
(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* $83 0.78%
*
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. If this agreement is not extended in the future, expenses could be higher.
Expenses Paid, Amount $ 83 [2]
Expense Ratio, Percent 0.78% [2]
Factors Affecting Performance [Text Block]
How did the Fund perform last year ?
  • For the 12-month period ended May 31, 2025, the Fund’s Class I shares returned 12.91%.
  • In comparison, the S&P 500® Index (the “Index”) returned 13.52% for the same period.
What affected the Fund’s performance?
  • U.S. equities were driven by large-cap technology gains, tariff-induced volatility, weak economic data and anticipation of possible U.S. Federal Reserve rate cuts.
  • Stock selection in the staples, health care and technology sectors contributed to the Fund’s performance relative to the Index.
  • The Fund’s emphasis on dividend-paying issues detracted from relative performance, particularly in the consumer discretionary sector.
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
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]
How did the Fund perform over the past 10 years?
The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance from June 1 , 2015 through May 31, 2025
Initial Investment of $10,000
Fund Performance - Growth of 10K Chart
The above graph compares a hypothetical $10,000 investment in the Fund’s Class I shares to a hypothetical investment of $10,000 made in the S&P 500® Index on 5/31/2015. The performance shown takes into account applicable fees and expenses of the Fund, including management fees and other expenses. The Fund’s performance also assumes the reinvestment of dividends and capital gains. Unlike the Fund, the Index is not subject to charges, fees and other expenses. Investors cannot invest directly in any index.
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (AS OF 5/31/25 )
Share Class 1YR 5YR 10YR
Class I 12.91% 17.10% 11.36%
S&P 500® Index 13.52% 15.94% 12.86%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block] For more current information visit  bny.com/investments/literaturecenter .
Net Assets $ 1,658,000,000
Holdings Count | Holding 102
Advisory Fees Paid, Amount $ 10,244,777
Investment Company Portfolio Turnover 28.38%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 5/31/25 )

Fund Size (Millions)

Number of Holdings
Total Advisory Fee Paid During
Period

Annual Portfolio Turnover
$1,658 102 $10,244,777 28.38%
Holdings [Text Block]
Portfolio Holdings (as of 5/31/25 )
Top Ten Holdings (Based on Net Assets) *
Graphical Representation - Top N Holdings Chart
* Excludes money market funds or other short-term securities held for the investment of cash and cash collateral for securities loaned, if any.
Sector Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
Largest Holdings [Text Block]
Top Ten Holdings (Based on Net Assets) *
Graphical Representation - Top N Holdings Chart
* Excludes money market funds or other short-term securities held for the investment of cash and cash collateral for securities loaned, if any.
C000130467 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Equity Income Fund
Class Name Class Y
Trading Symbol DQIYX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about BNY Mellon Equity Income Fund (the “Fund”) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual 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 year ?
(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 Y $80 0.75%
Expenses Paid, Amount $ 80
Expense Ratio, Percent 0.75%
Factors Affecting Performance [Text Block]
How did the Fund perform last year ?
  • For the 12-month period ended May 31, 2025, the Fund’s Class Y shares returned 12.97%.
  • In comparison, the S&P 500® Index (the “Index”) returned 13.52% for the same period.
What affected the Fund’s performance?
  • U.S. equities were driven by large-cap technology gains, tariff-induced volatility, weak economic data and anticipation of possible U.S. Federal Reserve rate cuts.
  • Stock selection in the staples, health care and technology sectors contributed to the Fund’s performance relative to the Index.
  • The Fund’s emphasis on dividend-paying issues detracted from relative performance, particularly in the consumer discretionary sector.
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
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]
How did the Fund perform over the past 10 years?
The Fund’s past performance is not a good predictor of the Fund’s future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance from June 1 , 2015 through May 31, 2025
Initial Investment of $1,000,000
Fund Performance - Growth of 10K Chart
The above graph compares a hypothetical $1,000,000 investment in the Fund’s Class Y shares to a hypothetical investment of $1,000,000 made in the S&P 500® Index on 5/31/2015. The performance shown takes into account applicable fees and expenses of the Fund, including management fees and other expenses. The Fund’s performance also assumes the reinvestment of dividends and capital gains. Unlike the Fund, the Index is not subject to charges, fees and other expenses. Investors cannot invest directly in any index.
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURNS (AS OF 5/31/25 )
Share Class 1YR 5YR 10YR
Class Y 12.97% 17.14% 11.46%
S&P 500® Index 13.52% 15.94% 12.86%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block] For more current information visit  bny.com/investments/literaturecenter .
Net Assets $ 1,658,000,000
Holdings Count | Holding 102
Advisory Fees Paid, Amount $ 10,244,777
Investment Company Portfolio Turnover 28.38%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 5/31/25 )

Fund Size (Millions)

Number of Holdings
Total Advisory Fee Paid During
Period

Annual Portfolio Turnover
$1,658 102 $10,244,777 28.38%
Holdings [Text Block]
Portfolio Holdings (as of 5/31/25 )
Top Ten Holdings (Based on Net Assets) *
Graphical Representation - Top N Holdings Chart
* Excludes money market funds or other short-term securities held for the investment of cash and cash collateral for securities loaned, if any.
Sector Allocation (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
Largest Holdings [Text Block]
Top Ten Holdings (Based on Net Assets) *
Graphical Representation - Top N Holdings Chart
* Excludes money market funds or other short-term securities held for the investment of cash and cash collateral for securities loaned, if any.
[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. If this agreement is not extended in the future, expenses could be higher.
[2] 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. If this agreement is not extended in the future, expenses could be higher.