v3.25.2
Shareholder Report
6 Months Ended
Apr. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name CREDIT SUISSE OPPORTUNITY FUNDS
Entity Central Index Key 0000946110
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2025
C000029053  
Shareholder Report [Line Items]  
Fund Name Credit Suisse Floating Rate High Income Fund
Class Name Class A
Trading Symbol CHIAX
Annual or Semi-Annual Statement [Text Block] This Semi-Annual shareholder report contains important information about Credit Suisse Floating Rate High Income Fund (the "Fund") for the period of November 1, 2024 to April 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 https://us-fund.credit-suisse.com/CHIAX. You can also request this information by contacting us at 877-870-2874.
Additional Information Phone Number 877-870-2874
Additional Information Website https://us-fund.credit-suisse.com/CHIAX
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$48
0.95%
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.95%
AssetsNet $ 1,795,245,262
Holdings Count | Holding 491
InvestmentCompanyPortfolioTurnover 23.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets
$1,795,245,262
# of Portfolio Holdings
491
Portfolio Turnover Rate
23%
Holdings [Text Block]

Portfolio Breakdown (% of Total Investments)

Bank Loans
84.2%
Short-Term Investments
6.0
Corporate Bonds
5.2
Asset Backed Securities
3.6
Common Stocks
1.0
Warrants
0.0
Credit Quality Explanation [Text Block] Credit Quality is based on ratings provided by the S&P Global Ratings Division of S&P Global Inc. ("S&P"). S&P is a main provider of ratings for credit asset classes and is widely used amongst industry participants. The NR category consists of securities that have not been rated by S&P.
Largest Holdings [Text Block]

Credit Quality BreakdownFootnote Reference* 

(% of Total Investments) 

S&P RatingsFootnote Reference**
Value
B
22.3%
B-
21.1
B+
12.3
BB
7.9
BB-
9.3
BB+
3.0
BBB-
3.7
BBB+
0.2
CC
1.0
CCC
1.1
CCC-
1.0
CCC+
4.5
NR
11.6
Subtotal
99.0
Equity and Other
1.0
Total
100.0%
FootnoteDescription
Footnote*
Expressed as a percentage of total investments (excluding securities lending collateral, if applicable) and may vary over time.
Footnote**
Credit Quality is based on ratings provided by the S&P Global Ratings Division of S&P Global Inc. ("S&P"). S&P is a main provider of ratings for credit asset classes and is widely used amongst industry participants. The NR category consists of securities that have not been rated by S&P.

Derivatives are not reflected in amounts reported above.

Updated Prospectus Phone Number 877-870-2874
C000029055  
Shareholder Report [Line Items]  
Fund Name Credit Suisse Floating Rate High Income Fund
Class Name Class C
Trading Symbol CHICX
Annual or Semi-Annual Statement [Text Block] This Semi-Annual shareholder report contains important information about Credit Suisse Floating Rate High Income Fund (the "Fund") for the period of November 1, 2024 to April 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 https://us-fund.credit-suisse.com/CHICX. You can also request this information by contacting us at 877-870-2874.
Additional Information Phone Number 877-870-2874
Additional Information Website https://us-fund.credit-suisse.com/CHICX
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$85
1.70%
Expenses Paid, Amount $ 85
Expense Ratio, Percent 1.70%
AssetsNet $ 1,795,245,262
Holdings Count | Holding 491
InvestmentCompanyPortfolioTurnover 23.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets
$1,795,245,262
# of Portfolio Holdings
491
Portfolio Turnover Rate
23%
Holdings [Text Block]

Portfolio Breakdown (% of Total Investments)

Bank Loans
84.2%
Short-Term Investments
6.0
Corporate Bonds
5.2
Asset Backed Securities
3.6
Common Stocks
1.0
Warrants
0.0
Credit Quality Explanation [Text Block] Credit Quality is based on ratings provided by the S&P Global Ratings Division of S&P Global Inc. ("S&P"). S&P is a main provider of ratings for credit asset classes and is widely used amongst industry participants. The NR category consists of securities that have not been rated by S&P.
Largest Holdings [Text Block]

Credit Quality BreakdownFootnote Reference* 

(% of Total Investments) 

S&P RatingsFootnote Reference**
Value
B
22.3%
B-
21.1
B+
12.3
BB
7.9
BB-
9.3
BB+
3.0
BBB-
3.7
BBB+
0.2
CC
1.0
CCC
1.1
CCC-
1.0
CCC+
4.5
NR
11.6
Subtotal
99.0
Equity and Other
1.0
Total
100.0%
FootnoteDescription
Footnote*
Expressed as a percentage of total investments (excluding securities lending collateral, if applicable) and may vary over time.
Footnote**
Credit Quality is based on ratings provided by the S&P Global Ratings Division of S&P Global Inc. ("S&P"). S&P is a main provider of ratings for credit asset classes and is widely used amongst industry participants. The NR category consists of securities that have not been rated by S&P.

Derivatives are not reflected in amounts reported above.

Updated Prospectus Phone Number 877-870-2874
C000029052  
Shareholder Report [Line Items]  
Fund Name Credit Suisse Floating Rate High Income Fund
Class Name Class I
Trading Symbol CSHIX
Annual or Semi-Annual Statement [Text Block] This Semi-Annual shareholder report contains important information about Credit Suisse Floating Rate High Income Fund (the "Fund") for the period of November 1, 2024 to April 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 https://us-fund.credit-suisse.com/CSHIX. You can also request this information by contacting us at 877-870-2874.
Additional Information Phone Number 877-870-2874
Additional Information Website https://us-fund.credit-suisse.com/CSHIX
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$35
0.70%
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.70%
AssetsNet $ 1,795,245,262
Holdings Count | Holding 491
InvestmentCompanyPortfolioTurnover 23.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets
$1,795,245,262
# of Portfolio Holdings
491
Portfolio Turnover Rate
23%
Holdings [Text Block]

Portfolio Breakdown (% of Total Investments)

Bank Loans
84.2%
Short-Term Investments
6.0
Corporate Bonds
5.2
Asset Backed Securities
3.6
Common Stocks
1.0
Warrants
0.0
Credit Quality Explanation [Text Block] Credit Quality is based on ratings provided by the S&P Global Ratings Division of S&P Global Inc. ("S&P"). S&P is a main provider of ratings for credit asset classes and is widely used amongst industry participants. The NR category consists of securities that have not been rated by S&P.
Largest Holdings [Text Block]

Credit Quality BreakdownFootnote Reference* 

(% of Total Investments) 

S&P RatingsFootnote Reference**
Value
B
22.3%
B-
21.1
B+
12.3
BB
7.9
BB-
9.3
BB+
3.0
BBB-
3.7
BBB+
0.2
CC
1.0
CCC
1.1
CCC-
1.0
CCC+
4.5
NR
11.6
Subtotal
99.0
Equity and Other
1.0
Total
100.0%
FootnoteDescription
Footnote*
Expressed as a percentage of total investments (excluding securities lending collateral, if applicable) and may vary over time.
Footnote**
Credit Quality is based on ratings provided by the S&P Global Ratings Division of S&P Global Inc. ("S&P"). S&P is a main provider of ratings for credit asset classes and is widely used amongst industry participants. The NR category consists of securities that have not been rated by S&P.

Derivatives are not reflected in amounts reported above.

Updated Prospectus Phone Number 877-870-2874
C000118186  
Shareholder Report [Line Items]  
Fund Name Credit Suisse Strategic Income Fund
Class Name Class A
Trading Symbol CSOAX
Annual or Semi-Annual Statement [Text Block] This Semi-Annual shareholder report contains important information about Credit Suisse Strategic Income Fund (the "Fund") for the period of November 1, 2024 to April 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 https://us-fund.credit-suisse.com/CSOAX. You can also request this information by contacting us at 877-870-2874.
Additional Information Phone Number 877-870-2874
Additional Information Website https://us-fund.credit-suisse.com/CSOAX
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$52
1.04%
Expenses Paid, Amount $ 52
Expense Ratio, Percent 1.04%
AssetsNet $ 1,012,078,738
Holdings Count | Holding 602
InvestmentCompanyPortfolioTurnover 28.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets
$1,012,078,738
# of Portfolio Holdings
602
Portfolio Turnover Rate
28%
Holdings [Text Block]

Portfolio Breakdown (% of Total Investments)

Bank Loans
53.7%
Corporate Bonds
34.5
Short-Term Investments
8.1
Asset Backed Securities
3.0
Common Stocks
0.7
Warrants
0.0
Credit Quality Explanation [Text Block] Credit Quality is based on ratings provided by the S&P Global Ratings Division of S&P Global Inc. ("S&P"). S&P is a main provider of ratings for credit asset classes and is widely used amongst industry participants. The NR category consists of securities that have not been rated by S&P.
Largest Holdings [Text Block]

Credit Quality BreakdownFootnote Reference* 

(% of Total Investments) 

S&P RatingsFootnote Reference**
Value
AAA
0.5%
B
18.7
B-
16.3
B+
13.7
BB
9.5
BB-
11.6
BB+
7.1
BBB-
2.2
CC
0.4
CCC
1.7
CCC-
0.6
CCC+
4.9
NR
12.1
Subtotal
99.3
Equity and Other
0.7
Total
100.0%
FootnoteDescription
Footnote*
Expressed as a percentage of total investments (excluding securities lending collateral, if applicable) and may vary over time.
Footnote**
Credit Quality is based on ratings provided by the S&P Global Ratings Division of S&P Global Inc. ("S&P"). S&P is a main provider of ratings for credit asset classes and is widely used amongst industry participants. The NR category consists of securities that have not been rated by S&P.

Derivatives are not reflected in amounts reported above.

Updated Prospectus Phone Number 877-870-2874
C000120097  
Shareholder Report [Line Items]  
Fund Name Credit Suisse Strategic Income Fund
Class Name Class C
Trading Symbol CSOCX
Annual or Semi-Annual Statement [Text Block] This Semi-Annual shareholder report contains important information about Credit Suisse Strategic Income Fund (the "Fund") for the period of November 1, 2024 to April 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 https://us-fund.credit-suisse.com/CSOCX. You can also request this information by contacting us at 877-870-2874.
Additional Information Phone Number 877-870-2874
Additional Information Website https://us-fund.credit-suisse.com/CSOCX
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$89
1.79%
Expenses Paid, Amount $ 89
Expense Ratio, Percent 1.79%
AssetsNet $ 1,012,078,738
Holdings Count | Holding 602
InvestmentCompanyPortfolioTurnover 28.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets
$1,012,078,738
# of Portfolio Holdings
602
Portfolio Turnover Rate
28%
Holdings [Text Block]

Portfolio Breakdown (% of Total Investments)

Bank Loans
53.7%
Corporate Bonds
34.5
Short-Term Investments
8.1
Asset Backed Securities
3.0
Common Stocks
0.7
Warrants
0.0
Credit Quality Explanation [Text Block] Credit Quality is based on ratings provided by the S&P Global Ratings Division of S&P Global Inc. ("S&P"). S&P is a main provider of ratings for credit asset classes and is widely used amongst industry participants. The NR category consists of securities that have not been rated by S&P.
Largest Holdings [Text Block]

Credit Quality BreakdownFootnote Reference* 

(% of Total Investments) 

S&P RatingsFootnote Reference**
Value
AAA
0.5%
B
18.7
B-
16.3
B+
13.7
BB
9.5
BB-
11.6
BB+
7.1
BBB-
2.2
CC
0.4
CCC
1.7
CCC-
0.6
CCC+
4.9
NR
12.1
Subtotal
99.3
Equity and Other
0.7
Total
100.0%
FootnoteDescription
Footnote*
Expressed as a percentage of total investments (excluding securities lending collateral, if applicable) and may vary over time.
Footnote**
Credit Quality is based on ratings provided by the S&P Global Ratings Division of S&P Global Inc. ("S&P"). S&P is a main provider of ratings for credit asset classes and is widely used amongst industry participants. The NR category consists of securities that have not been rated by S&P.

Derivatives are not reflected in amounts reported above.

Updated Prospectus Phone Number 877-870-2874
C000120098  
Shareholder Report [Line Items]  
Fund Name Credit Suisse Strategic Income Fund
Class Name Class I
Trading Symbol CSOIX
Annual or Semi-Annual Statement [Text Block] This Semi-Annual shareholder report contains important information about Credit Suisse Strategic Income Fund (the "Fund") for the period of November 1, 2024 to April 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 https://us-fund.credit-suisse.com/CSOIX. You can also request this information by contacting us at 877-870-2874.
Additional Information Phone Number 877-870-2874
Additional Information Website https://us-fund.credit-suisse.com/CSOIX
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class I
$39
0.79%
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.79%
AssetsNet $ 1,012,078,738
Holdings Count | Holding 602
InvestmentCompanyPortfolioTurnover 28.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets
$1,012,078,738
# of Portfolio Holdings
602
Portfolio Turnover Rate
28%
Holdings [Text Block]

Portfolio Breakdown (% of Total Investments)

Bank Loans
53.7%
Corporate Bonds
34.5
Short-Term Investments
8.1
Asset Backed Securities
3.0
Common Stocks
0.7
Warrants
0.0
Credit Quality Explanation [Text Block] Credit Quality is based on ratings provided by the S&P Global Ratings Division of S&P Global Inc. ("S&P"). S&P is a main provider of ratings for credit asset classes and is widely used amongst industry participants. The NR category consists of securities that have not been rated by S&P.
Largest Holdings [Text Block]

Credit Quality BreakdownFootnote Reference* 

(% of Total Investments) 

S&P RatingsFootnote Reference**
Value
AAA
0.5%
B
18.7
B-
16.3
B+
13.7
BB
9.5
BB-
11.6
BB+
7.1
BBB-
2.2
CC
0.4
CCC
1.7
CCC-
0.6
CCC+
4.9
NR
12.1
Subtotal
99.3
Equity and Other
0.7
Total
100.0%
FootnoteDescription
Footnote*
Expressed as a percentage of total investments (excluding securities lending collateral, if applicable) and may vary over time.
Footnote**
Credit Quality is based on ratings provided by the S&P Global Ratings Division of S&P Global Inc. ("S&P"). S&P is a main provider of ratings for credit asset classes and is widely used amongst industry participants. The NR category consists of securities that have not been rated by S&P.

Derivatives are not reflected in amounts reported above.

Updated Prospectus Phone Number 877-870-2874