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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 I
Entity Central Index Key 0000799295
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
C000081694 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Global Fixed Income Fund
Class Name Class A
Trading Symbol DHGAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon Global Fixed Income 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 $44 0.87%*
*
Annualized.
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.87% [1]
Net Assets $ 3,391,000,000
Holdings Count | Holding 550
Investment Company Portfolio Turnover 49.58%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 6/30/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$3,391 550 49.58%
Holdings [Text Block]
Portfolio Holdings (as of 6/30/25 )
Country Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
C000081695 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Global Fixed Income Fund
Class Name Class C
Trading Symbol DHGCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon Global Fixed Income 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 $78 1.55%*
*
Annualized.
Expenses Paid, Amount $ 78
Expense Ratio, Percent 1.55% [2]
Net Assets $ 3,391,000,000
Holdings Count | Holding 550
Investment Company Portfolio Turnover 49.58%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 6/30/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$3,391 550 49.58%
Holdings [Text Block]
Portfolio Holdings (as of 6/30/25 )
Country Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
C000031763 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Global Fixed Income Fund
Class Name Class I
Trading Symbol SDGIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon Global Fixed Income 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 $27 0.54%*
*
Annualized.
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.54% [3]
Net Assets $ 3,391,000,000
Holdings Count | Holding 550
Investment Company Portfolio Turnover 49.58%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 6/30/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$3,391 550 49.58%
Holdings [Text Block]
Portfolio Holdings (as of 6/30/25 )
Country Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
C000130461 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Global Fixed Income Fund
Class Name Class Y
Trading Symbol DSDYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon Global Fixed Income 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 Y $23 0.46%*
*
Annualized.
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.46% [4]
Net Assets $ 3,391,000,000
Holdings Count | Holding 550
Investment Company Portfolio Turnover 49.58%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 6/30/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$3,391 550 49.58%
Holdings [Text Block]
Portfolio Holdings (as of 6/30/25 )
Country Allocation (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Allocation 1 Chart
[1] Annualized.
[2] Annualized.
[3] Annualized.
[4] Annualized.