497

787 Seventh Avenue New York, NY 10019-6099 Tel:  212 728 8000 Fax: 212 728 8111

October 17, 2012

VIA EDGAR

Securities and Exchange Commission

100 F Street, NE

Washington, DC 20549

Re:Credit Suisse Opportunity Funds

Securities Act File No. 33-92982
Investment Company Act File No. 811-9054

Ladies and Gentlemen:

On behalf of the Registrant and pursuant to Rule 497(e) under the Securities Act of 1933, as amended, attached for filing are exhibits containing interactive data format risk/return summary information that mirrors the risk/return summary information in the Prospectuses, dated March 5, 2012, as amended October 4, 2012, for the Credit Suisse Multialternative Strategy Fund (the “Fund”), a series of Credit Suisse Opportunity Funds. The purpose of the filing is to submit the 497 filing dated October 4, 2012 in XBRL for the Fund.

Any questions or comments on the attached should be directed to the undersigned at 212-728-8611.

Sincerely,

/s/ Elizabeth G. Miller

Elizabeth G. Miller

NEW YORK    WASHINGTON    PARIS    LONDON    MILAN    ROME    FRANKFURT    BRUSSELS

in alliance with Dickson Minto W.S., London and Edinburgh

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Credit Suisse Multialternative Strategy Fund (Prospectus Summary) | Credit Suisse Multialternative Strategy Fund

CREDIT SUISSE MULTIALTERNATIVE STRATEGY FUND

INVESTMENT OBJECTIVE

The fund seeks to achieve investment results that correspond generally to the
performance, before fees and expenses, of the Credit Suisse Liquid Alternative
Beta Index.

FEES AND FUND EXPENSES

The accompanying tables describe the fees and expenses that you may pay if you
buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or
agree to invest in the future, at least $50,000 in Credit Suisse Funds. More
information about these and other discounts is available from your financial
representative and in this Prospectus on page 54 under the heading "Other
Shareholder Information - Class A and C Shares and Sales Charges" and in the
fund's Statement of Additional Information ("SAI") on page 51 under the heading
"Additional Purchase and Redemption Information."

Shareholder fees (paid directly from your investment)

Shareholder Fees Credit Suisse Multialternative Strategy Fund	Class A		Class C		Class I
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	5.25%		none		none
Maximum deferred sales charge (load) (as a percentage of the lesser of original purchase price or redemption proceeds, as applicable)	none	[1]	1.00%	[2]	none
Maximum sales charge (load) on reinvested distributions (as a percentage of offering price)	none		none		none
Redemption or exchange fees (as a percentage of net asset value on date of redemption or exchange) (for shares redeemed or exchanged within 30 days from the date of purchase)	2.00%		2.00%		2.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Credit Suisse Multialternative Strategy Fund		Class A	Class C	Class I
Management fee		1.15%	1.15%	1.15%
Distribution and service (12b-1) fee		0.25%	1.00%	none
Other expenses of the fund	[1]	1.80%	1.80%	1.80%
Other expenses of the subsidiary	[1]	0.10%	0.10%	0.10%
Acquired fund fees and expenses	[2]	0.08%	0.08%	0.08%
Total annual fund operating expenses		3.38%	4.13%	3.13%
Less: amount of fee limitations/expense reimbursements	[3]	1.43%	1.43%	1.43%
Total annual fund operating expenses after fee limitations/expense reimbursements		1.95%	2.70%	1.70%

EXAMPLE

This example may help you compare the cost of investing in the fund with the
cost of investing in other mutual funds.

Assume you invest $10,000, the fund returns 5% annually, expense ratios remain
the same and you close your account at the end of each of the time periods
shown. Based on these assumptions, your cost would be:

Expense Example Credit Suisse Multialternative Strategy Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years
Class A	713	1,383
Class C	373	1,125
Class I	173	832

Expense Example, No Redemption Credit Suisse Multialternative Strategy Fund (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years
Class A	713	1,383
Class C	273	1,125
Class I	173	832

PORTFOLIO TURNOVER

The fund's portfolio turnover rate is expected to be low for regulatory purposes
because the computation excludes trades of derivatives and instruments with a
maturity of one year or less. However, the fund expects to engage in frequent
trading of derivatives, which could have tax consequences that impact
shareholders, such as the realization of taxable short-term capital gains. In
addition, the fund could incur transaction costs, such as commissions, when it
buys and sells securities and other instruments. Transaction costs, which are
not reflected in annual fund operating expenses or in the example, affect the
fund's performance.

PRINCIPAL INVESTMENT STRATEGIES

The fund employs a "passive" or indexing investment approach designed to track
generally the performance of the Credit Suisse Liquid Alternative Beta Index
(the "Index"). The Index seeks to approximate the aggregate returns of the
universe of hedge funds, as represented by the Dow Jones Credit Suisse Hedge
Fund Index (the "DJCS Hedge Fund Index"), using liquid investments. The DJCS
Hedge Fund Index is a widely recognized asset-weighted benchmark that measures
hedge fund performance.

The fund attempts to replicate the Index by investing all, or substantially all,
of its assets in securities and financial instruments that provide exposure to
the Index components in approximately the same weighting that such components
have within the Index at the applicable time. The constituents of the Index
include securities and financial instruments within the U.S. and non-U.S. equity
(including emerging markets), U.S. and non-U.S. fixed income (including emerging
markets), commodity and currency asset classes. The Index performance is
currently a combination of its three primary strategy components: Long/Short
Equity, Event Driven and Global Strategies. Long/Short Equity Strategies seek
to provide long and short exposure to a diversified portfolio of equities which
involves investing in equities (i.e., investing long) that are expected to
increase in value and selling equities (i.e., short sales or short selling)
that are expected to decrease in value. Long/Short Equity Strategies have the
flexibility to shift investment styles, such as from value to growth, from small
to medium to large capitalization stocks, and from net long to net short. Event
Driven Strategies typically invest in various asset classes and seek to profit
from potential mispricing of securities related to a specific corporate or
market event. Such events can include: mergers, bankruptcies, financial or
operational stress, restructurings, asset sales, recapitalizations, spin-offs,
litigation, regulatory and legislative changes as well as other types of
corporate events. Event Driven Strategies include merger arbitrage, in which
the fund buys shares of the "target" company in a proposed merger or other
reorganization between two companies. If the consideration in the transaction
consists of stock of the acquirer, the fund may seek to hedge the exposure to
the acquirer by shorting the stock of the acquiring company. Global Strategies
incorporate hedge fund strategies which invest across geographies and asset
classes typically in a tactical manner and also incorporate certain arbitrage
strategies. Examples of strategies of such types of hedge funds include
convertible arbitrage, global macro and managed futures. The investment
universe of Global Strategies is world wide, including emerging markets,
and often includes exposures to equities, currencies, interest rates, and
commodities.

The percentage of the fund's portfolio exposed to each asset class
and geographic region or to any hedge fund strategy will vary from time to
time as the Index constituents and constituent weightings change.

The fund will invest in a broad range of instruments, including, but not
limited to, equities, American Depository Receipts and Global Depository
Receipts, exchange-traded funds ("ETFs"), bonds (both investment grade and
below investment grade (commonly referred to as "junk bonds")), exchange-traded
notes ("ETNs"), currencies, commodities, futures, options and swaps, either
by investing directly in these instruments or, in the case of commodities and
certain commodity-linked instruments, indirectly, by investing in the Subsidiary
(as described below) that invests in such commodities and commodity-linked
instruments. The fund also may invest in cash and cash equivalents. As a result
of the fund's use of derivatives, the fund may hold significant amounts of
high-quality, short-term securities, including U.S. Treasuries, shares of money
market funds and repurchase agreements. The fund also may invest in high-yield
securities to earn income, as well as to achieve its objective.

From time to time, the fund may invest a portion of its assets in instruments
that are not included in the Index, if Credit Suisse Asset Management, LLC
("Credit Suisse"), the fund's investment adviser, believes that those
instruments will help the fund track the Index.

The fund primarily will gain exposure to commodities and commodity-linked
instruments through investments in the Subsidiary. It is expected that the
Subsidiary will invest primarily in commodity futures and swaps and other
investments designed to serve as collateral for the Subsidiary's futures and
swaps (i.e., high-quality, short-term securities). The Subsidiary is managed
by Credit Suisse and has the same investment objective as the fund. The fund
may invest up to 25% of its total assets in the Subsidiary. Investment in the
Subsidiary is expected to provide the fund with commodity exposure within the
limitations of the federal tax requirements that apply to the fund.

The fund does not invest in hedge funds. To the extent the Index is or becomes
concentrated in a particular industry or group of industries, the fund may
invest more than 25% of its assets in that industry or group of industries to
the extent necessary to track the Index.

PRINCIPAL RISKS OF INVESTING IN THE FUND

A WORD ABOUT RISK

All investments involve some level of risk. Simply defined, risk is the
possibility that you will lose money or not make money.

Principal risk factors for the fund are discussed below. Before you invest,
please make sure you understand the risks that apply to the fund. As with any
mutual fund, you could lose money over any period of time.

Investments in the fund are not bank deposits and are not insured or guaranteed
by the Federal Deposit Insurance Corporation or any other government agency.

ARBITRAGE OR FUNDAMENTAL RISK

Employing arbitrage and alternative strategies has the risk that anticipated
opportunities do not play out as planned, resulting in potentially reduced
returns or losses to the fund as it unwinds failed trades.

BELOW INVESTMENT GRADE SECURITIES RISK

Below investment grade securities are regarded as being predominantly
speculative as to the issuer's ability to make payments of principal and
interest. Investment in such securities involves substantial risk. Issuers
of below investment grade securities may be highly leveraged and may not have
available to them more traditional methods of financing. Therefore, the risks
associated with acquiring the securities of such issuers generally are greater
than is the case with higher-rated securities.

CFTC REGULATION

Due to recent Commodity Futures Trading Commission ("CFTC") rule amendments,
the disclosures and operations of the fund will need to comply with applicable
regulations governing commodity pools, which will increase the fund's regulatory
compliance costs. Other potentially adverse regulatory initiatives could
develop.

COMMODITY EXPOSURE RISKS

Exposure to the commodities markets may subject the fund to greater volatility
than investments in traditional securities. The value of commodity futures and
swaps may be affected by changes in overall market movements, commodity index
volatility, changes in interest rates, or sectors affecting a particular
industry or commodity, such as drought, floods, weather, livestock disease,
embargoes, tariffs and international economic, political and regulatory
developments.

CONCENTRATION RISK

If the Index is or becomes concentrated in a particular industry or group of
industries, the fund may invest 25% or more of the value of its total assets in
that industry or group of industries to the extent that it is necessary to gain
exposure to that industry or group of industries for purposes of tracking the
Index. Concentration of investments in a particular industry or group of
industries could subject the fund to greater risk of loss and could be
considerably more volatile than a broad-based market index or other mutual
funds that are diversified across a greater number of industries.

CREDIT RISK

The issuer of a security or the counterparty to a contract, including
derivatives contracts, may default or otherwise become unable to honor a
financial obligation.

DERIVATIVES RISK

Derivatives are financial contracts whose value depends on, or is derived from,
the value of an underlying asset, reference rate or index. The fund typically
uses derivatives as a substitute for taking a position in the underlying asset
and/or as part of a strategy designed to reduce exposure to other risks, such as
interest rate or currency risk. The fund also may use derivatives for leverage.
The fund's use of derivative instruments involves risks different from, or
possibly greater than, the risks associated with investing directly in
securities and other traditional investments. Derivatives are subject to a
number of risks described elsewhere in this Prospectus, such as commodity
exposure risks, interest rate risk, market risk and credit risk. Also, suitable
derivative transactions may not be available in all circumstances and there can
be no assurance that the fund will engage in these transactions to reduce
exposure to other risks when that would be beneficial.

EXCHANGE-TRADED FUNDS RISK

Most ETFs are investment companies whose shares are purchased and sold on a
securities exchange. An ETF represents a portfolio of securities designed to
track a particular market segment or index. An investment in an ETF generally
presents the same primary risks as an investment in a conventional fund (i.e.,
one that is not exchange-traded) that has the same investment objectives,
strategies and policies. In addition, an ETF may fail to accurately track the
market segment or index that underlies its investment objective. The price of
an ETF can fluctuate, and the fund could lose money investing in an ETF.

EXCHANGE-TRADED NOTES RISK

ETNs are a type of unsecured, unsubordinated debt security that combines certain
aspects of bonds and ETFs. Similar to ETFs, ETNs are traded on a major exchange
(e.g., the New York Stock Exchange) during normal trading hours. However, investors
can also hold the ETN until maturity. At maturity, the issuer pays to the investor
a cash amount equal to the principal amount, subject to the day's index factor.
ETN returns are based upon the performance of a market index minus applicable fees.
ETNs do not make periodic coupon payments and provide no principal protection. The
value of an ETN may be influenced by time to maturity, level of supply and demand
for the ETN, volatility and lack of liquidity in underlying commodities markets,
changes in the applicable interest rates, changes in the issuer's credit rating
and economic, legal, political or geographic events that affect the referenced
commodity. The value of the ETN may drop due to a downgrade in the issuer's
credit rating, despite the underlying index remaining unchanged. The timing and
character of income and gains derived from ETNs is under consideration by the U.S.
Treasury and Internal Revenue Service and also may be affected by future legislation.

FOREIGN SECURITIES RISK

A fund that invests outside the U.S. carries additional risks that include:

o Currency Risk Fluctuations in exchange rates between the U.S. dollar and
foreign currencies may negatively affect an investment. Adverse changes in
exchange rates may erode or reverse any gains produced by
foreign-currency-denominated investments and may widen any losses. The fund
may, but is not required to, seek to reduce currency risk by hedging part or
all of its exposure to various foreign currencies.

o Emerging Markets Risk The risks of investing in foreign securities are
increased in connection with investments in emerging markets. Emerging markets
are countries generally considered to be relatively less developed or
industrialized. Emerging markets often face economic problems that could subject
the fund to increased volatility or substantial declines in value. Deficiencies
in regulatory oversight, market infrastructure, shareholder protections and
company laws could expose the fund to risks beyond those generally encountered
in developed countries. In addition, profound social changes and business
practices that depart from norms in developed countries' economies have hindered
the orderly growth of emerging economies and their markets in the past and have
caused instability. High levels of debt tend to make emerging economies heavily
reliant on foreign capital and vulnerable to capital flight. Countries in emerging
markets are also more likely to experience high levels of inflation, deflation,
currency devaluation or unemployment, which could hurt their economies and
securities markets. For these and other reasons, investments in emerging markets
are often considered speculative.

o Information Risk Key information about an issuer, security or market may be
inaccurate or unavailable.

o Political Risk Foreign governments may expropriate assets, impose capital or
currency controls, impose punitive taxes, or nationalize a company or industry.
Any of these actions could have a severe effect on security prices and impair
the fund's ability to bring its capital or income back to the U.S. Other
political risks include economic policy changes, social and political
instability, military action and war.

FORWARDS RISK

Forwards are not exchange-traded and therefore no clearinghouse or exchange
stands ready to meet the obligations of the contracts. Thus, the fund faces
the risk that its counterparties may not perform their obligations. Forward
contracts also are not regulated by the CFTC and therefore the fund will not
receive any benefit of CFTC regulation when trading forwards.

FUTURES CONTRACTS RISK

The risks associated with the fund's use of futures contracts include the risk
that: (i) changes in the price of a futures contract may not always track the
changes in market value of the underlying reference asset; (ii) trading
restrictions or limitations may be imposed by an exchange, and government
regulations may restrict trading in futures contracts; and (iii) if the fund
has insufficient cash to meet margin requirements, the fund may need to sell
other investments, including at disadvantageous times.

INDEX/TRACKING ERROR RISK

The fund's portfolio composition and performance may not match, and may vary
substantially from, that of the Index for any period of time. Unlike the fund,
the returns of the Index are not reduced by investment and other operating
expenses. In addition, there can be no assurance that the fund will be able to
duplicate the exact composition of the Index, or that the Index will track the
performance of the DJCS Hedge Fund Index.

INTEREST RATE RISK

Changes in interest rates may cause a decline in the market value of an
investment. With bonds and other fixed income securities, a rise in interest
rates typically causes a fall in values, while a fall in interest rates
typically causes a rise in values.

LEVERAGING RISK

The Fund may invest in certain derivatives that provide leveraged exposure. The
Fund's investment in these instruments generally requires a small investment
relative to the amount of investment exposure assumed. As a result, such
investments may cause the Fund to lose more than the amount it invested in those
instruments. The net asset value of the fund when employing leverage will be
more volatile and sensitive to market movements. Leverage may involve the
creation of a liability that requires the portfolio to pay interest.

MARKET RISK

The market value of a security may fluctuate, sometimes rapidly and
unpredictably. These fluctuations, which are often referred to as "volatility,"
may cause a security to be worth less than it was worth at an earlier time.
Market risk may affect a single issuer, industry, commodity, sector of the
economy, or the market as a whole. Market risk is common to most investments -
including stocks, bonds and commodities, and the mutual funds that invest in them.
The performance of "value" stocks and "growth" stocks may rise or decline under
varying market conditions - for example, value stocks may perform well under
circumstances in which growth stocks in general have fallen.

Bonds and other fixed income securities generally involve less market risk than
stocks and commodities. The risk of bonds can vary significantly depending upon
factors such as issuer and maturity. The bonds of some companies may be riskier
than the stocks of others.

NON-DIVERSIFIED STATUS

The fund is considered a non-diversified investment company under the Investment
Company Act of 1940, as amended (the "1940 Act"), and is permitted to invest a
greater proportion of its assets in the securities of a smaller number of issuers.
As a result, the fund may be subject to greater volatility with respect to its
portfolio securities than a fund that is diversified.

PORTFOLIO TURNOVER RISK

Active and frequent trading may lead to the realization and distribution to
shareholders of higher short-term capital gains, which would increase their tax
liability. Frequent trading also increases transaction costs, which could
detract from the fund's performance.

SMALL- AND MID-CAP STOCK RISK

The fund may invest in small- and mid-cap stocks. Stocks of small-cap companies,
and to a lesser extent, mid-cap companies, may be more volatile than, and not as
readily marketable as, those of larger companies.

SPECULATIVE EXPOSURE RISK

Gains or losses from speculative positions in a derivative may be much greater
than the derivative's original cost. For example, potential losses from
commodity-linked swap agreements and from writing uncovered call options are
unlimited.

SUBSIDIARY RISK

By investing in the Subsidiary, the fund is exposed indirectly to the risks
associated with the Subsidiary's investments. The derivatives and other
investments held by the Subsidiary are generally similar to those that are
permitted to be held by the fund and are subject to the same risks that apply
to similar investments if held directly by the fund. These risks are described
elsewhere in this Prospectus. There can be no assurance that the investment
objective of the Subsidiary will be achieved.

The Subsidiary is not registered under the 1940 Act, and, unless otherwise noted
in this Prospectus, is not subject to all the investor protections of the 1940
Act. However, the fund wholly owns and controls the Subsidiary, and the fund
and the Subsidiary are both managed by Credit Suisse, making it unlikely that
the Subsidiary will take action contrary to the interests of the fund and its
shareholders. The fund's Board of Trustees has oversight responsibility for the
investment activities of the fund, including its investment in the Subsidiary,
and the fund's role as sole shareholder of the Subsidiary. The Subsidiary will
be subject to the same investment restrictions and limitations, and follow the
same compliance policies and procedures, as the fund.

Changes in the laws of the United States and/or the Cayman Islands could result
in the inability of the fund and/or the Subsidiary to continue to operate as it
does currently and could adversely affect the fund.

SWAP AGREEMENTS RISK

Swap agreements involve the risk that the party with whom the fund has entered
into the swap will default on its obligation to pay the fund and the risk that
the fund will not be able to meet its obligations to pay the other party to the
agreement.

TAX RISK

In order to qualify as a Regulated Investment Company (a "RIC") under the
Internal Revenue Code of 1986, as amended (the "Code"), the fund must meet
certain requirements regarding the source of its income, the diversification
of its assets and the distribution of its income. The Internal Revenue Service
("IRS") has issued a ruling that income realized from certain types of
commodity-linked derivatives would not be qualifying income. As such, the fund's
ability to realize income from investments in such commodity-linked derivatives
as part of its investment strategy would be limited to a maximum of 10% of its
gross income. If the fund fails to qualify as a RIC, the fund will be subject to
federal income tax on its net income at regular corporate rates (without reduction
for distributions to shareholders). When distributed, that income also would be
taxable to shareholders as an ordinary dividend to the extent attributable to the
fund's earnings and profits. If the fund were to fail to qualify as a RIC and
became subject to federal income tax, shareholders of the fund would be subject
to diminished returns.

The IRS has issued private letter rulings to registered investment companies
concluding that income derived from their investment in a wholly-owned subsidiary
would constitute qualifying income to the fund. The IRS has indicated that the
granting of these types of private letter rulings is currently suspended, pending
further internal discussion. As a result, the fund has not received, and there can
be no assurance that the IRS will grant, such a private letter ruling to the fund.
If the fund does not request and receive such a private letter ruling, there is a
risk that the IRS could assert that the income derived from the fund's investment
in the Subsidiary will not be considered qualifying income for purposes of the fund
remaining qualified as a RIC for U.S. federal income tax purposes.

VALUATION RISK

The lack of an active trading market may make it difficult to obtain an accurate
price for a portfolio security. Many derivative instruments are not actively
traded.

PERFORMANCE SUMMARY

Because the fund is new, no performance information is available as of the date
of this Prospectus.

The fund makes updated performance information available at the fund's website
(www.credit-suisse.com/us/funds) or by calling Credit Suisse Funds at
877-870-2874.

[1] Purchases of shares of $1,000,000 or more may be subject to a 1% deferred sales charge on redemptions within 12 months of purchase.

[2] 1% during the first year.

[1] The fund invests in Credit Suisse Cayman Multialternative Strategy Fund, Ltd, a wholly-owned subsidiary of the fund organized under the laws of the Cayman Islands (the "Subsidiary"). "Other expenses" have been estimated for the fund's and the Subsidiary's first year of operations.

[2] "Acquired Fund Fees and Expenses" have been estimated for the fund's first year of operations.

[3] Credit Suisse Opportunity Funds (the "Trust") and Credit Suisse Asset Management, LLC ("Credit Suisse") have entered into a written contract limiting operating expenses to 1.95% of the fund's average daily net assets for Class A shares, 2.70% of the fund's average daily net assets for Class C shares and 1.70% of the fund's average daily net assets for Class I shares at least through March 31, 2013. The Trust is authorized to reimburse Credit Suisse for management fees previously limited and/or for expenses previously paid by Credit Suisse, provided, however, that any reimbursements must be paid at a date not more than three years after the end of the fund's first year of operations and the reimbursements do not cause a class to exceed the applicable expense limitation in the contract at the time the fees were limited or expenses are paid. This contract may not be terminated before the end of the fund's first year of operations.

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Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Mar. 05, 2012
Credit Suisse Multialternative Strategy Fund (Prospectus Summary) | Credit Suisse Multialternative Strategy Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	CREDIT SUISSE MULTIALTERNATIVE STRATEGY FUND
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks to achieve investment results that correspond generally to the performance, before fees and expenses, of the Credit Suisse Liquid Alternative Beta Index.
Expense [Heading]	rr_ExpenseHeading	FEES AND FUND EXPENSES
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The accompanying tables describe the fees and expenses that you may pay if you buy and hold shares of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Credit Suisse Funds. More information about these and other discounts is available from your financial representative and in this Prospectus on page 54 under the heading "Other Shareholder Information - Class A and C Shares and Sales Charges" and in the fund's Statement of Additional Information ("SAI") on page 51 under the heading "Additional Purchase and Redemption Information."
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder fees (paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The fund's portfolio turnover rate is expected to be low for regulatory purposes because the computation excludes trades of derivatives and instruments with a maturity of one year or less. However, the fund expects to engage in frequent trading of derivatives, which could have tax consequences that impact shareholders, such as the realization of taxable short-term capital gains. In addition, the fund could incur transaction costs, such as commissions, when it buys and sells securities and other instruments. Transaction costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Credit Suisse Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	"Other expenses" have been estimated for the fund's and the Subsidiary's first year of operations.
Acquired Fund Fees and Expenses, Based on Estimates [Text]	rr_AcquiredFundFeesAndExpensesBasedOnEstimates	"Acquired Fund Fees and Expenses" have been estimated for the fund's first year of operations.
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLE
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This example may help you compare the cost of investing in the fund with the cost of investing in other mutual funds. Assume you invest $10,000, the fund returns 5% annually, expense ratios remain the same and you close your account at the end of each of the time periods shown. Based on these assumptions, your cost would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The fund employs a "passive" or indexing investment approach designed to track generally the performance of the Credit Suisse Liquid Alternative Beta Index (the "Index"). The Index seeks to approximate the aggregate returns of the universe of hedge funds, as represented by the Dow Jones Credit Suisse Hedge Fund Index (the "DJCS Hedge Fund Index"), using liquid investments. The DJCS Hedge Fund Index is a widely recognized asset-weighted benchmark that measures hedge fund performance. The fund attempts to replicate the Index by investing all, or substantially all, of its assets in securities and financial instruments that provide exposure to the Index components in approximately the same weighting that such components have within the Index at the applicable time. The constituents of the Index include securities and financial instruments within the U.S. and non-U.S. equity (including emerging markets), U.S. and non-U.S. fixed income (including emerging markets), commodity and currency asset classes. The Index performance is currently a combination of its three primary strategy components: Long/Short Equity, Event Driven and Global Strategies. Long/Short Equity Strategies seek to provide long and short exposure to a diversified portfolio of equities which involves investing in equities (i.e., investing long) that are expected to increase in value and selling equities (i.e., short sales or short selling) that are expected to decrease in value. Long/Short Equity Strategies have the flexibility to shift investment styles, such as from value to growth, from small to medium to large capitalization stocks, and from net long to net short. Event Driven Strategies typically invest in various asset classes and seek to profit from potential mispricing of securities related to a specific corporate or market event. Such events can include: mergers, bankruptcies, financial or operational stress, restructurings, asset sales, recapitalizations, spin-offs, litigation, regulatory and legislative changes as well as other types of corporate events. Event Driven Strategies include merger arbitrage, in which the fund buys shares of the "target" company in a proposed merger or other reorganization between two companies. If the consideration in the transaction consists of stock of the acquirer, the fund may seek to hedge the exposure to the acquirer by shorting the stock of the acquiring company. Global Strategies incorporate hedge fund strategies which invest across geographies and asset classes typically in a tactical manner and also incorporate certain arbitrage strategies. Examples of strategies of such types of hedge funds include convertible arbitrage, global macro and managed futures. The investment universe of Global Strategies is world wide, including emerging markets, and often includes exposures to equities, currencies, interest rates, and commodities. The percentage of the fund's portfolio exposed to each asset class and geographic region or to any hedge fund strategy will vary from time to time as the Index constituents and constituent weightings change. The fund will invest in a broad range of instruments, including, but not limited to, equities, American Depository Receipts and Global Depository Receipts, exchange-traded funds ("ETFs"), bonds (both investment grade and below investment grade (commonly referred to as "junk bonds")), exchange-traded notes ("ETNs"), currencies, commodities, futures, options and swaps, either by investing directly in these instruments or, in the case of commodities and certain commodity-linked instruments, indirectly, by investing in the Subsidiary (as described below) that invests in such commodities and commodity-linked instruments. The fund also may invest in cash and cash equivalents. As a result of the fund's use of derivatives, the fund may hold significant amounts of high-quality, short-term securities, including U.S. Treasuries, shares of money market funds and repurchase agreements. The fund also may invest in high-yield securities to earn income, as well as to achieve its objective. From time to time, the fund may invest a portion of its assets in instruments that are not included in the Index, if Credit Suisse Asset Management, LLC ("Credit Suisse"), the fund's investment adviser, believes that those instruments will help the fund track the Index. The fund primarily will gain exposure to commodities and commodity-linked instruments through investments in the Subsidiary. It is expected that the Subsidiary will invest primarily in commodity futures and swaps and other investments designed to serve as collateral for the Subsidiary's futures and swaps (i.e., high-quality, short-term securities). The Subsidiary is managed by Credit Suisse and has the same investment objective as the fund. The fund may invest up to 25% of its total assets in the Subsidiary. Investment in the Subsidiary is expected to provide the fund with commodity exposure within the limitations of the federal tax requirements that apply to the fund. The fund does not invest in hedge funds. To the extent the Index is or becomes concentrated in a particular industry or group of industries, the fund may invest more than 25% of its assets in that industry or group of industries to the extent necessary to track the Index.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS OF INVESTING IN THE FUND
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	A WORD ABOUT RISK All investments involve some level of risk. Simply defined, risk is the possibility that you will lose money or not make money. Principal risk factors for the fund are discussed below. Before you invest, please make sure you understand the risks that apply to the fund. As with any mutual fund, you could lose money over any period of time. Investments in the fund are not bank deposits and are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. ARBITRAGE OR FUNDAMENTAL RISK Employing arbitrage and alternative strategies has the risk that anticipated opportunities do not play out as planned, resulting in potentially reduced returns or losses to the fund as it unwinds failed trades. BELOW INVESTMENT GRADE SECURITIES RISK Below investment grade securities are regarded as being predominantly speculative as to the issuer's ability to make payments of principal and interest. Investment in such securities involves substantial risk. Issuers of below investment grade securities may be highly leveraged and may not have available to them more traditional methods of financing. Therefore, the risks associated with acquiring the securities of such issuers generally are greater than is the case with higher-rated securities. CFTC REGULATION Due to recent Commodity Futures Trading Commission ("CFTC") rule amendments, the disclosures and operations of the fund will need to comply with applicable regulations governing commodity pools, which will increase the fund's regulatory compliance costs. Other potentially adverse regulatory initiatives could develop. COMMODITY EXPOSURE RISKS Exposure to the commodities markets may subject the fund to greater volatility than investments in traditional securities. The value of commodity futures and swaps may be affected by changes in overall market movements, commodity index volatility, changes in interest rates, or sectors affecting a particular industry or commodity, such as drought, floods, weather, livestock disease, embargoes, tariffs and international economic, political and regulatory developments. CONCENTRATION RISK If the Index is or becomes concentrated in a particular industry or group of industries, the fund may invest 25% or more of the value of its total assets in that industry or group of industries to the extent that it is necessary to gain exposure to that industry or group of industries for purposes of tracking the Index. Concentration of investments in a particular industry or group of industries could subject the fund to greater risk of loss and could be considerably more volatile than a broad-based market index or other mutual funds that are diversified across a greater number of industries. CREDIT RISK The issuer of a security or the counterparty to a contract, including derivatives contracts, may default or otherwise become unable to honor a financial obligation. DERIVATIVES RISK Derivatives are financial contracts whose value depends on, or is derived from, the value of an underlying asset, reference rate or index. The fund typically uses derivatives as a substitute for taking a position in the underlying asset and/or as part of a strategy designed to reduce exposure to other risks, such as interest rate or currency risk. The fund also may use derivatives for leverage. The fund's use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. Derivatives are subject to a number of risks described elsewhere in this Prospectus, such as commodity exposure risks, interest rate risk, market risk and credit risk. Also, suitable derivative transactions may not be available in all circumstances and there can be no assurance that the fund will engage in these transactions to reduce exposure to other risks when that would be beneficial. EXCHANGE-TRADED FUNDS RISK Most ETFs are investment companies whose shares are purchased and sold on a securities exchange. An ETF represents a portfolio of securities designed to track a particular market segment or index. An investment in an ETF generally presents the same primary risks as an investment in a conventional fund (i.e., one that is not exchange-traded) that has the same investment objectives, strategies and policies. In addition, an ETF may fail to accurately track the market segment or index that underlies its investment objective. The price of an ETF can fluctuate, and the fund could lose money investing in an ETF. EXCHANGE-TRADED NOTES RISK ETNs are a type of unsecured, unsubordinated debt security that combines certain aspects of bonds and ETFs. Similar to ETFs, ETNs are traded on a major exchange (e.g., the New York Stock Exchange) during normal trading hours. However, investors can also hold the ETN until maturity. At maturity, the issuer pays to the investor a cash amount equal to the principal amount, subject to the day's index factor. ETN returns are based upon the performance of a market index minus applicable fees. ETNs do not make periodic coupon payments and provide no principal protection. The value of an ETN may be influenced by time to maturity, level of supply and demand for the ETN, volatility and lack of liquidity in underlying commodities markets, changes in the applicable interest rates, changes in the issuer's credit rating and economic, legal, political or geographic events that affect the referenced commodity. The value of the ETN may drop due to a downgrade in the issuer's credit rating, despite the underlying index remaining unchanged. The timing and character of income and gains derived from ETNs is under consideration by the U.S. Treasury and Internal Revenue Service and also may be affected by future legislation. FOREIGN SECURITIES RISK A fund that invests outside the U.S. carries additional risks that include: o Currency Risk Fluctuations in exchange rates between the U.S. dollar and foreign currencies may negatively affect an investment. Adverse changes in exchange rates may erode or reverse any gains produced by foreign-currency-denominated investments and may widen any losses. The fund may, but is not required to, seek to reduce currency risk by hedging part or all of its exposure to various foreign currencies. o Emerging Markets Risk The risks of investing in foreign securities are increased in connection with investments in emerging markets. Emerging markets are countries generally considered to be relatively less developed or industrialized. Emerging markets often face economic problems that could subject the fund to increased volatility or substantial declines in value. Deficiencies in regulatory oversight, market infrastructure, shareholder protections and company laws could expose the fund to risks beyond those generally encountered in developed countries. In addition, profound social changes and business practices that depart from norms in developed countries' economies have hindered the orderly growth of emerging economies and their markets in the past and have caused instability. High levels of debt tend to make emerging economies heavily reliant on foreign capital and vulnerable to capital flight. Countries in emerging markets are also more likely to experience high levels of inflation, deflation, currency devaluation or unemployment, which could hurt their economies and securities markets. For these and other reasons, investments in emerging markets are often considered speculative. o Information Risk Key information about an issuer, security or market may be inaccurate or unavailable. o Political Risk Foreign governments may expropriate assets, impose capital or currency controls, impose punitive taxes, or nationalize a company or industry. Any of these actions could have a severe effect on security prices and impair the fund's ability to bring its capital or income back to the U.S. Other political risks include economic policy changes, social and political instability, military action and war. FORWARDS RISK Forwards are not exchange-traded and therefore no clearinghouse or exchange stands ready to meet the obligations of the contracts. Thus, the fund faces the risk that its counterparties may not perform their obligations. Forward contracts also are not regulated by the CFTC and therefore the fund will not receive any benefit of CFTC regulation when trading forwards. FUTURES CONTRACTS RISK The risks associated with the fund's use of futures contracts include the risk that: (i) changes in the price of a futures contract may not always track the changes in market value of the underlying reference asset; (ii) trading restrictions or limitations may be imposed by an exchange, and government regulations may restrict trading in futures contracts; and (iii) if the fund has insufficient cash to meet margin requirements, the fund may need to sell other investments, including at disadvantageous times. INDEX/TRACKING ERROR RISK The fund's portfolio composition and performance may not match, and may vary substantially from, that of the Index for any period of time. Unlike the fund, the returns of the Index are not reduced by investment and other operating expenses. In addition, there can be no assurance that the fund will be able to duplicate the exact composition of the Index, or that the Index will track the performance of the DJCS Hedge Fund Index. INTEREST RATE RISK Changes in interest rates may cause a decline in the market value of an investment. With bonds and other fixed income securities, a rise in interest rates typically causes a fall in values, while a fall in interest rates typically causes a rise in values. LEVERAGING RISK The Fund may invest in certain derivatives that provide leveraged exposure. The Fund's investment in these instruments generally requires a small investment relative to the amount of investment exposure assumed. As a result, such investments may cause the Fund to lose more than the amount it invested in those instruments. The net asset value of the fund when employing leverage will be more volatile and sensitive to market movements. Leverage may involve the creation of a liability that requires the portfolio to pay interest. MARKET RISK The market value of a security may fluctuate, sometimes rapidly and unpredictably. These fluctuations, which are often referred to as "volatility," may cause a security to be worth less than it was worth at an earlier time. Market risk may affect a single issuer, industry, commodity, sector of the economy, or the market as a whole. Market risk is common to most investments - including stocks, bonds and commodities, and the mutual funds that invest in them. The performance of "value" stocks and "growth" stocks may rise or decline under varying market conditions - for example, value stocks may perform well under circumstances in which growth stocks in general have fallen. Bonds and other fixed income securities generally involve less market risk than stocks and commodities. The risk of bonds can vary significantly depending upon factors such as issuer and maturity. The bonds of some companies may be riskier than the stocks of others. NON-DIVERSIFIED STATUS The fund is considered a non-diversified investment company under the Investment Company Act of 1940, as amended (the "1940 Act"), and is permitted to invest a greater proportion of its assets in the securities of a smaller number of issuers. As a result, the fund may be subject to greater volatility with respect to its portfolio securities than a fund that is diversified. PORTFOLIO TURNOVER RISK Active and frequent trading may lead to the realization and distribution to shareholders of higher short-term capital gains, which would increase their tax liability. Frequent trading also increases transaction costs, which could detract from the fund's performance. SMALL- AND MID-CAP STOCK RISK The fund may invest in small- and mid-cap stocks. Stocks of small-cap companies, and to a lesser extent, mid-cap companies, may be more volatile than, and not as readily marketable as, those of larger companies. SPECULATIVE EXPOSURE RISK Gains or losses from speculative positions in a derivative may be much greater than the derivative's original cost. For example, potential losses from commodity-linked swap agreements and from writing uncovered call options are unlimited. SUBSIDIARY RISK By investing in the Subsidiary, the fund is exposed indirectly to the risks associated with the Subsidiary's investments. The derivatives and other investments held by the Subsidiary are generally similar to those that are permitted to be held by the fund and are subject to the same risks that apply to similar investments if held directly by the fund. These risks are described elsewhere in this Prospectus. There can be no assurance that the investment objective of the Subsidiary will be achieved. The Subsidiary is not registered under the 1940 Act, and, unless otherwise noted in this Prospectus, is not subject to all the investor protections of the 1940 Act. However, the fund wholly owns and controls the Subsidiary, and the fund and the Subsidiary are both managed by Credit Suisse, making it unlikely that the Subsidiary will take action contrary to the interests of the fund and its shareholders. The fund's Board of Trustees has oversight responsibility for the investment activities of the fund, including its investment in the Subsidiary, and the fund's role as sole shareholder of the Subsidiary. The Subsidiary will be subject to the same investment restrictions and limitations, and follow the same compliance policies and procedures, as the fund. Changes in the laws of the United States and/or the Cayman Islands could result in the inability of the fund and/or the Subsidiary to continue to operate as it does currently and could adversely affect the fund. SWAP AGREEMENTS RISK Swap agreements involve the risk that the party with whom the fund has entered into the swap will default on its obligation to pay the fund and the risk that the fund will not be able to meet its obligations to pay the other party to the agreement. TAX RISK In order to qualify as a Regulated Investment Company (a "RIC") under the Internal Revenue Code of 1986, as amended (the "Code"), the fund must meet certain requirements regarding the source of its income, the diversification of its assets and the distribution of its income. The Internal Revenue Service ("IRS") has issued a ruling that income realized from certain types of commodity-linked derivatives would not be qualifying income. As such, the fund's ability to realize income from investments in such commodity-linked derivatives as part of its investment strategy would be limited to a maximum of 10% of its gross income. If the fund fails to qualify as a RIC, the fund will be subject to federal income tax on its net income at regular corporate rates (without reduction for distributions to shareholders). When distributed, that income also would be taxable to shareholders as an ordinary dividend to the extent attributable to the fund's earnings and profits. If the fund were to fail to qualify as a RIC and became subject to federal income tax, shareholders of the fund would be subject to diminished returns. The IRS has issued private letter rulings to registered investment companies concluding that income derived from their investment in a wholly-owned subsidiary would constitute qualifying income to the fund. The IRS has indicated that the granting of these types of private letter rulings is currently suspended, pending further internal discussion. As a result, the fund has not received, and there can be no assurance that the IRS will grant, such a private letter ruling to the fund. If the fund does not request and receive such a private letter ruling, there is a risk that the IRS could assert that the income derived from the fund's investment in the Subsidiary will not be considered qualifying income for purposes of the fund remaining qualified as a RIC for U.S. federal income tax purposes. VALUATION RISK The lack of an active trading market may make it difficult to obtain an accurate price for a portfolio security. Many derivative instruments are not actively traded.
Risk Lose Money [Text]	rr_RiskLoseMoney	Simply defined, risk is the possibility that you will lose money or not make money.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	The fund is considered a non-diversified investment company under the Investment Company Act of 1940, as amended (the "1940 Act"), and is permitted to invest a greater proportion of its assets in the securities of a smaller number of issuers. As a result, the fund may be subject to greater volatility with respect to its portfolio securities than a fund that is diversified.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	Investments in the fund are not bank deposits and are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE SUMMARY
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	Because the fund is new, no performance information is available as of the date of this Prospectus. The fund makes updated performance information available at the fund's website (www.credit-suisse.com/us/funds) or by calling Credit Suisse Funds at 877-870-2874.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	Because the fund is new, no performance information is available as of the date of this Prospectus.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	877-870-2874
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.credit-suisse.com/us/funds
Credit Suisse Multialternative Strategy Fund (Prospectus Summary) | Credit Suisse Multialternative Strategy Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.25%
Maximum deferred sales charge (load) (as a percentage of the lesser of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Maximum sales charge (load) on reinvested distributions (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption or exchange fees (as a percentage of net asset value on date of redemption or exchange) (for shares redeemed or exchanged within 30 days from the date of purchase)	rr_RedemptionFeeOverRedemption	(2.00%)
Management fee	rr_ManagementFeesOverAssets	1.15%
Distribution and service (12b-1) fee	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses of the fund	rr_Component1OtherExpensesOverAssets	1.80%	[2]
Other expenses of the subsidiary	rr_Component2OtherExpensesOverAssets	0.10%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.08%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	3.38%
Less: amount of fee limitations/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.43%)	[4]
Total annual fund operating expenses after fee limitations/expense reimbursements	rr_NetExpensesOverAssets	1.95%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-03-31
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	713
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,383
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	713
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	1,383
Credit Suisse Multialternative Strategy Fund (Prospectus Summary) | Credit Suisse Multialternative Strategy Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of the lesser of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[5]
Maximum sales charge (load) on reinvested distributions (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption or exchange fees (as a percentage of net asset value on date of redemption or exchange) (for shares redeemed or exchanged within 30 days from the date of purchase)	rr_RedemptionFeeOverRedemption	(2.00%)
Management fee	rr_ManagementFeesOverAssets	1.15%
Distribution and service (12b-1) fee	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses of the fund	rr_Component1OtherExpensesOverAssets	1.80%	[2]
Other expenses of the subsidiary	rr_Component2OtherExpensesOverAssets	0.10%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.08%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	4.13%
Less: amount of fee limitations/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.43%)	[4]
Total annual fund operating expenses after fee limitations/expense reimbursements	rr_NetExpensesOverAssets	2.70%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-03-31
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	373
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,125
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	273
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	1,125
Credit Suisse Multialternative Strategy Fund (Prospectus Summary) | Credit Suisse Multialternative Strategy Fund | Class I
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) (as a percentage of the lesser of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Maximum sales charge (load) on reinvested distributions (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption or exchange fees (as a percentage of net asset value on date of redemption or exchange) (for shares redeemed or exchanged within 30 days from the date of purchase)	rr_RedemptionFeeOverRedemption	(2.00%)
Management fee	rr_ManagementFeesOverAssets	1.15%
Distribution and service (12b-1) fee	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses of the fund	rr_Component1OtherExpensesOverAssets	1.80%	[2]
Other expenses of the subsidiary	rr_Component2OtherExpensesOverAssets	0.10%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.08%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	3.13%
Less: amount of fee limitations/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.43%)	[4]
Total annual fund operating expenses after fee limitations/expense reimbursements	rr_NetExpensesOverAssets	1.70%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-03-31
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	173
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	832
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	173
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	832

[1] Purchases of shares of $1,000,000 or more may be subject to a 1% deferred sales charge on redemptions within 12 months of purchase.

[2] The fund invests in Credit Suisse Cayman Multialternative Strategy Fund, Ltd, a wholly-owned subsidiary of the fund organized under the laws of the Cayman Islands (the "Subsidiary"). "Other expenses" have been estimated for the fund's and the Subsidiary's first year of operations.

[3] "Acquired Fund Fees and Expenses" have been estimated for the fund's first year of operations.

[4] Credit Suisse Opportunity Funds (the "Trust") and Credit Suisse Asset Management, LLC ("Credit Suisse") have entered into a written contract limiting operating expenses to 1.95% of the fund's average daily net assets for Class A shares, 2.70% of the fund's average daily net assets for Class C shares and 1.70% of the fund's average daily net assets for Class I shares at least through March 31, 2013. The Trust is authorized to reimburse Credit Suisse for management fees previously limited and/or for expenses previously paid by Credit Suisse, provided, however, that any reimbursements must be paid at a date not more than three years after the end of the fund's first year of operations and the reimbursements do not cause a class to exceed the applicable expense limitation in the contract at the time the fees were limited or expenses are paid. This contract may not be terminated before the end of the fund's first year of operations.

[5] 1% during the first year.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
Document Type	dei_DocumentType	Other
Document Period End Date	dei_DocumentPeriodEndDate	Oct. 04, 2012
Registrant Name	dei_EntityRegistrantName	CREDIT SUISSE OPPORTUNITY FUNDS
Central Index Key	dei_EntityCentralIndexKey	0000946110
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Oct. 04, 2012
Document Effective Date	dei_DocumentEffectiveDate	Oct. 04, 2012
Credit Suisse Multialternative Strategy Fund (Prospectus Summary) | Credit Suisse Multialternative Strategy Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	CSQAX
Credit Suisse Multialternative Strategy Fund (Prospectus Summary) | Credit Suisse Multialternative Strategy Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	CSQCX
Credit Suisse Multialternative Strategy Fund (Prospectus Summary) | Credit Suisse Multialternative Strategy Fund | Class I
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	CSQIX