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Shareholder Report
 6 Months Ended
Mar. 31, 2026
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, 2026
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, 2025 to March 31, 2026.
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 $47 0.80%*
*
Annualized.
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.80% [1]
Net Assets $ 1,219,000,000
Holdings Count | Holding 48
Investment Company Portfolio Turnover 49.89%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 3/31/26 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,219 48 49.89%
Holdings [Text Block]
Portfolio Holdings (as of 3/31/26 )
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, 2025 to March 31, 2026.
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 $54 0.92%*
*
Annualized.
Expenses Paid, Amount $ 54
Expense Ratio, Percent 0.92% [2]
Net Assets $ 1,219,000,000
Holdings Count | Holding 48
Investment Company Portfolio Turnover 49.89%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 3/31/26 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,219 48 49.89%
Holdings [Text Block]
Portfolio Holdings (as of 3/31/26 )
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, 2025 to March 31, 2026.
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 $109 1.87%*
*
Annualized.
Expenses Paid, Amount $ 109
Expense Ratio, Percent 1.87% [3]
Net Assets $ 1,219,000,000
Holdings Count | Holding 48
Investment Company Portfolio Turnover 49.89%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 3/31/26 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,219 48 49.89%
Holdings [Text Block]
Portfolio Holdings (as of 3/31/26 )
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.
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, 2025 to March 31, 2026.
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 $67 1.15%*
*
Annualized.
Expenses Paid, Amount $ 67
Expense Ratio, Percent 1.15% [4]
Net Assets $ 1,219,000,000
Holdings Count | Holding 48
Investment Company Portfolio Turnover 49.89%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 3/31/26 )

Fund Size (Millions)
Number of Holdings
Portfolio Turnover
$1,219 48 49.89%
Holdings [Text Block]
Portfolio Holdings (as of 3/31/26 )
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.