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Shareholder Report
 6 Months Ended
Mar. 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name BNY Mellon Opportunity Funds
Entity Central Index Key 0001111178
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2025
C000004623 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Natural Resources Fund
Class Name Class A
Trading Symbol DNLAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon Natural Resources Fund (the “Fund”) for the period of October 1, 2024 to March 31, 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 $55 1.16%*
*
Annualized.
Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.16% [1]
Net Assets $ 1,127,000,000
Holdings Count | Holding 40
Investment Company Portfolio Turnover 54.87%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 3/31/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,127 40 54.87%
Holdings [Text Block]
Portfolio Holdings (as of 3/31/25 )
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.
C000004625 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Natural Resources Fund
Class Name Class C
Trading Symbol DLDCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon Natural Resources Fund (the “Fund”) for the period of October 1, 2024 to March 31, 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 $89 1.87%*
*
Annualized.
Expenses Paid, Amount $ 89
Expense Ratio, Percent 1.87% [2]
Net Assets $ 1,127,000,000
Holdings Count | Holding 40
Investment Company Portfolio Turnover 54.87%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 3/31/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,127 40 54.87%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 3/31/25 )
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.
C000004626 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Natural Resources Fund
Class Name Class I
Trading Symbol DLDRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon Natural Resources Fund (the “Fund”) for the period of October 1, 2024 to March 31, 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 $44 0.93%*
*
Annualized.
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.93% [3]
Net Assets $ 1,127,000,000
Holdings Count | Holding 40
Investment Company Portfolio Turnover 54.87%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 3/31/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,127 40 54.87%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 3/31/25 )
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.
C000162241 [Member]  
Shareholder Report [Line Items]  
Fund Name BNY Mellon Natural Resources Fund
Class Name Class Y
Trading Symbol DLDYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about BNY Mellon Natural Resources Fund (the “Fund”) for the period of October 1, 2024 to March 31, 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 $38 0.80%*
*
Annualized.
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.80% [4]
Net Assets $ 1,127,000,000
Holdings Count | Holding 40
Investment Company Portfolio Turnover 54.87%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 3/31/25 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,127 40 54.87%
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 3/31/25 )
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] Annualized.
[2] Annualized.
[3] Annualized.
[4] Annualized.