485BPOS

Registration No. 333-166297

File No. 811-09373

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC  20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	T
Pre-Effective Amendment No.	o
Post-Effective Amendment No. 7	o
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	T
Amendment No. 36	T

OPPENHEIMER SENIOR FLOATING RATE FUND

(Exact Name of Registrant as Specified in Charter)

6803 South Tucson Way,
Centennial, Colorado 80112-3924

(Address of Principal Executive Offices) (Zip Code)

(303) 768-3200

(Registrant’s Telephone Number, including Area Code)

Arthur S. Gabinet, Esq.
OppenheimerFunds, Inc.
Two World Financial Center,
225 Liberty Street – New York,
New York 10281-1008

(Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box):

T Immediately upon filing pursuant to paragraph (b)	£ On (date) pursuant to paragraph (a)(1)
£ On (date) pursuant to paragraph (b)	£ 75 days after filing pursuant to paragraph (a)(2)
£ 60 days after filing pursuant to paragraph (a)(1)	£ On (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

£      This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all the requirements for effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Registration Statement on Form N-1A to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York and State of New York on the 13^th day of November, 2012.

OPPENHEIMER SENIOR FLOATING RATE FUND
By:	William F. Glavin, Jr.*
	William F. Glavin, Jr., President, Principal Executive Officer & Trustee

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the date indicated:

Signature	Title	Date
William L. Armstrong*	Chairman of the Board of Trustees	November 13, 2012
William L. Armstrong
William F. Glavin, Jr *	President, Principal Executive Officer	November 13, 2012
William F. Glavin, Jr	and Trustee
Brian W. Wixted*	Treasurer, Principal Financial &	November 13, 2012
Brian W. Wixted	Accounting Officer
Edward L. Cameron*	Trustee	November 13, 2012
Edward L. Cameron
Jon S. Fossel*	Trustee	November 13, 2012
Jon S. Fossel
Sam Freedman*	Trustee	November 13, 2012
Sam Freedman
Richard F. Grabish*	Trustee	November 13, 2012
Richard F. Grabish
Beverly L. Hamilton*	Trustee	November 13, 2012
Beverly L. Hamilton
Victoria J. Herget*	Trustee	November 13, 2012
Victoria J. Herget
Robert J. Malone*	Trustee	November 13, 2012
Robert J. Malone
F. William Marshall, Jr.*	Trustee	November 13, 2012
F. William Marshall, Jr.
Karen L. Stuckey*	Trustee	November 13, 2012
Karen L. Stuckey
James D. Vaughn*	Trustee	November 13, 2012
James D. Vaughn

*By:	/s/ Mitchell J. Lindauer
	Mitchell J. Lindauer, Attorney-in-Fact

EXHIBIT INDEX

Exhibit No.	Description
Ex-101.INS	XBRL Instance Document
Ex-101.SCH	XBRL Taxonomy Extension Schema Document
Ex-101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
Ex-101.DEF	XBRL Taxonomy Extension Definition Linkbase
Ex-101.LAB	XBRL Taxonomy Extension Labels Linkbase
Ex-101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

XML

Annual Total Returns (dei_DocumentInformationDocumentAxis, (Oppenheimer Senior Floating Rate Fund), Class A)	0 Months Ended
	Oct. 26, 2012
(Oppenheimer Senior Floating Rate Fund) | Class A
Bar Chart Table:
Annual Return 2002	1.92%
Annual Return 2003	11.23%
Annual Return 2004	7.20%
Annual Return 2005	5.64%
Annual Return 2006	7.11%
Annual Return 2007	1.52%
Annual Return 2008	(29.48%)
Annual Return 2009	43.51%
Annual Return 2010	13.15%
Annual Return 2011	2.37%

XML

(Oppenheimer Senior Floating Rate Fund)

Investment Objective. The Fund seeks income.

Fees and Expenses of the Fund. This table describes the fees and expenses that you may pay if you buy and hold or redeem shares of the Fund. You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $100,000 in certain funds in the Oppenheimer family of funds. More information about these and other discounts is available from your financial professional and in the section "About Your Account" beginning on page 15 of the prospectus and in the sections "How to Buy Shares" beginning on page 58 and "Appendix A" in the Fund's Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees (Oppenheimer Senior Floating Rate Fund)	Class A	Class B	Class C	Class N	Class Y	Class I
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	3.50%	none	none	none	none	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none	3.00%	1.00%	1.00%	none	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):

Annual Fund Operating Expenses (Oppenheimer Senior Floating Rate Fund)		Class A	Class B	Class C	Class N		Class Y	Class I
Management Fees		0.61%	0.61%	0.61%	0.61%	[1]	0.61%	0.61%	[1]
Distribution and/or Service (12b-1) Fees		0.25%	0.75%	0.75%	0.50%	[1]	none	none	[1]
Total Other Expenses		0.31%	0.44%	0.27%	0.46%	[1]	0.29%	0.18%	[1]
Interest and Fees from Borrowings		0.11%	0.11%	0.11%	0.11%	[1]	0.11%	0.11%	[1]
Other Expenses		0.20%	0.33%	0.16%	0.35%	[1]	0.18%	0.07%	[1]
Acquired Fund Fees and Expenses		0.01%	0.01%	0.01%	0.01%	[1]	0.01%	0.01%	[1]
Total Annual Fund Operating Expenses		1.18%	1.81%	1.64%	1.58%	[1]	0.91%	0.80%	[1]
Fee Waiver and/or Expense Reimbursement	[2]	(0.01%)	(0.01%)	(0.01%)	(0.01%)	[1]	(0.01%)	(0.01%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		1.17%	1.80%	1.63%	1.57%	[1]	0.90%	0.79%	[1]

Example. The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in a class of shares of the Fund for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your expenses would be as follows:

If shares are redeemed

Expense Example (Oppenheimer Senior Floating Rate Fund) (USD $)		1 Year	3 Years	5 Years	10 Years
Class A		466	713	979	1,739
Class B		485	724	1,088	1,823
Class C		267	520	898	1,958
Class N	[1]	261	502	866	1,892
Class Y		92	290	505	1,124
Class I	[1]	81	255	445	993

If shares are not redeemed

Expense Example, No Redemption (Oppenheimer Senior Floating Rate Fund) (USD $)		1 Year	3 Years	5 Years	10 Years
Class A		466	713	979	1,739
Class B		185	574	988	1,823
Class C		167	520	898	1,958
Class N	[1]	161	502	866	1,892
Class Y		92	290	505	1,124
Class I	[1]	81	255	445	993

Portfolio Turnover. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 54% of the average value of its portfolio.

Principal Investment Strategies. The Fund invests mainly in floating rate loans (sometimes referred to as "adjustable rate loans") that hold a senior position in the capital structure of U.S. and foreign corporations, partnerships or other business entities that, under normal circumstances, allow them to have priority of claim ahead of other obligations of a borrower in the event of liquidation. These investments are referred to as "Senior Loans." Senior Loans may be collateralized or uncollateralized. They pay interest at rates that float above, or are adjusted periodically based on, a benchmark that reflects current interest rates.

Under normal market conditions, the Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in Senior Loans. This non-fundamental investment policy will not be changed without 60 days' advance notice to shareholders. The Fund may invest in Senior Loans directly as an original lender, or by assignment from a lender, or it may invest indirectly through loan participation agreements. While most of these Senior Loans will be collateralized, the Fund can also invest up to 10% of its net assets (plus the amount of borrowings for investment purposes) in uncollateralized Senior Loans. The Fund can invest up to 20% of its net assets in cash or other loans and securities, such as: secured or unsecured fixed-rate loans, fixed or floating rate notes or bonds, securities issued or guaranteed by the U.S. government or its agencies or instrumentalities, investment-grade short-term debt obligations and common stock and other equity securities. The Fund also may invest in Senior Loans made in connection with highly leveraged transactions, including but not limited to, operating loans, leveraged buyout loans, and leveraged capitalization loans. The Fund can invest 25% or more of its total assets in securities of the group of industries in the financial services sector.

The Fund can invest in investment-grade or below-investment grade debt instruments (sometimes referred to as "junk bonds"). The Fund can invest up to 100% of its asets in debt instruments rated below investment-grade, and will normally invest a substantial portion of its assets in those securities. "Investment grade" debt instruments are rated in one of the top four categories by nationally recognized statistical rating organizations such as Moody's or Standard & Poor's. The Fund may also invest in unrated instruments, in which case the Manager may internally assign ratings to certain of those instruments, after assessing their credit quality, in categories similar to those of nationally recognized statistical rating organizations. Although it can also invest in investments rated below "B" the Fund will principally invest in debt obligations, including Senior Loans, that are rated "B" (which are below investment-grade) or higher by one or more of the rating organizations or, if unrated, determined by the Manager to be of comparable quality.

The Fund may invest in securities of U.S. and foreign issuers. The Fund can invest up to 20% of its total assets in Senior Loans or other securities issued by foreign entities. The Fund's foreign Senior Loans must be dollar-denominated, and interest and principal payments must be payable in U.S. dollars, which may reduce the risks of currency fluctuations.

The Fund has no requirements as to the range of maturities of the debt instruments it can buy or as to the market capitalization of the issuers of those instruments. The Fund can borrow up to one-third of the Fund's assets (including the amount borrowed) and use other techniques to manage its cash flow, to redeem shares, or to purchase assets, a technique referred to as "leverage." The Fund may also use certain types of derivative investments to try to enhance income or to try to manage ("hedge") investment risks, including, but not limited to, options, futures contracts, swaps, and "structured" notes.

In selecting investments for the Fund, the portfolio managers evaluate overall investment opportunities and risks among the types of investments the Fund can hold. They analyze the credit standing and risks of borrowers whose loans or debt securities they are considering for the Fund's portfolio. They evaluate information about borrowers from their own research or research supplied by rating organizations, agent banks or other sources and select only those loans that they believe are likely to pay the interest and repay the principal when it becomes due. The portfolio managers consider many factors, including, among others,

• the borrower's past and expected future financial performance

• the experience and depth of the borrower's management

• the status of the borrower's industry and its position in that industry

• the collateral for the loan or other debt security

• the borrower's assets and cash flows

• the credit quality of the debt obligations of the bank servicing the loan and other intermediaries imposed between the borrower and the Fund.

There can be no assurance that the Manager's analysis will identify all of the factors that may impair the value of a Senior Loan or other investment.

Principal Risks. The price of the Fund's shares can go up and down substantially. The value of the Fund's investments may change because of broad changes in the markets in which the Fund invests or because of poor investment selection, which could cause the Fund to underperform other funds with similar investment objectives. There is no assurance that the Fund will achieve its investment objective. When you redeem your shares, they may be worth more or less than what you paid for them. These risks mean that you can lose money by investing in the Fund.

Main Risks of Debt Securities. Debt securities may be subject to credit risk, interest rate risk, prepayment risk and extension risk. Credit risk is the risk that the issuer of a security might not make interest and principal payments on the security as they become due. If an issuer fails to pay interest or repay principal, the Fund's income or share value might be reduced. Adverse news about an issuer or a downgrade in an issuer's credit rating, for any reason, can also reduce the market value of the issuer's securities. Interest rate risk is the risk that when prevailing interest rates fall, the values of already-issued debt securities generally rise; and when prevailing interest rates rise, the values of already-issued debt securities generally fall, and they may be worth less than the amount the Fund paid for them. When interest rates change, the values of longer-term debt securities usually change more than the values of shorter-term debt securities.

When interest rates fall, debt securities may be repaid more quickly than expected and the Fund may be required to reinvest the proceeds at a lower interest rate. This is referred to as "prepayment risk." When interest rates rise, debt securities may be repaid more slowly than expected and the value of the Fund's holdings may fall sharply. This is referred to as "extension risk." Interest rate changes normally have different effects on variable or floating rate securities than they do on securities with fixed interest rates.

Certain Senior Loans have a feature that prevents their interest rates from adjusting below a specified minimum level. When short term interest rates are low, this feature could result in the interest rates of these Senior Loans becoming fixed at the applicable minimum level until short term interest rates rise above that level. Although this feature is intended to result in these Senior Loans yielding more than they otherwise would when short term interest rates are low, the feature might also result in the prices of these Senior Loans becoming more sensitive to changes in interest rates should short term interest rates rise but remain below the applicable minimum level.

Fixed Income Market Risks . Developments relating to subprime mortgages have adversely affected fixed-income securities markets in the United States, Europe and elsewhere. The values of many types of debt securities have been reduced, including debt securities that are not related to mortgage loans. In addition, broker-dealers and other market participants have been less willing to make a market in some types of debt instruments, which has impacted the liquidity of those instruments. These developments also have had a negative effect on the broader economy. There is a risk that a lack of liquidity or other adverse credit market conditions may hamper the Fund's ability to sell the debt securities in which it invests or to find and purchase suitable debt instruments.

Special Risks of Lower-Grade Securities. Lower-grade debt securities, whether rated or unrated, have greater risks than investment-grade securities. They may be subject to greater price fluctuations and have a greater risk that the issuer might not be able to pay interest and principal when due. The market for lower-grade securities may be less liquid and therefore they may be harder to value or to sell at an acceptable price, especially during times of market volatility or decline.

Special Risks of Senior Loans . In addition to the risks typically associated with debt securities, such as credit and interest rate risk discussed above, Senior Loans are also subject to the risk that a court could subordinate a Senior Loan, which typically holds a senior position in the capital structure of a borrower, to presently existing or future indebtedness or take other action detrimental to the holders of Senior Loans. Senior Loans usually have mandatory and optional prepayment provisions. If a borrower prepays a Senior Loan, the fund will have to reinvest the proceeds in other Senior Loans or securities that may pay lower interest rates.

Most, but not all, of the Fund's investments in Senior Loans must be collateralized, however, the Fund's other investments need not be collateralized. Senior Loans are subject to the risk that the value of the collateral, if any, securing a loan may decline, be insufficient to meet the obligations of the borrower, or be difficult to liquidate. In the event of a default, the Fund may have difficulty collecting on any collateral and would not have the ability to collect on any collateral for an uncollateralized loan. In addition, any collateral may be found invalid or may be used to pay other outstanding obligations of the borrower. The Fund's access to collateral, if any, may be limited by bankruptcy, other insolvency laws, or by the type of loan the fund has purchased. As a result, a collateralized Senior Loan may not be fully collateralized and can decline significantly in value.

Loan investments are often issued in connection with highly leveraged transactions. Such transactions include leveraged buyout loans, leveraged recapitalization loans, and other types of acquisition financing. These obligations are subject to greater credit risks than other investments including a greater possibility that the borrower may default or enter bankruptcy.

Due to restrictions on transfers in loan agreements and the nature of the private syndication of Senior Loans including, for example, the lack of publicly-available information, some Senior Loans are not as easily purchased or sold as publicly-traded securities. Some Senior Loans and other Fund investments are illiquid, which may make it difficult for the Fund to value them or dispose of them at an acceptable price when it wants to. Direct investments in Senior Loans and, to a lesser degree, investments in participation interests in or assignments of Senior Loans may be limited. There is a risk that the Fund may not be able to invest a sufficient amount in Senior Loans at all times to meet its 80% asset investment requirement. Investments in Senior Loans are expected to be less affected by changes in interest rates than fixed-rate securities.

Main Risks of Borrowing and Leverage. The Fund can borrow up to one-third of the value of its total assets (including the amount borrowed) from banks, as permitted by the Investment Company Act of 1940. It can use those borrowings for a number of purposes, including for purchasing Senior Loans or other securities, which can create "leverage." In that case, changes in the value of the Fund's investments will have a larger effect on its share price than if it did not borrow. Borrowing results in interest payments to the lenders and related expenses. Borrowing for investment purposes might reduce the Fund's return if the yield on the investments purchased is less than those borrowing costs. The Fund may also borrow to meet redemption obligations or for temporary and emergency purposes. The Fund currently participates in a line of credit with certain banks as lenders.

Main Risks of Foreign Investing. Foreign securities are subject to special risks. Foreign issuers are usually not subject to the same accounting and disclosure requirements that U.S. companies are subject to, which may make it difficult for the Fund to evaluate a foreign company's operations or financial condition. A change in the value of a foreign currency against the U.S. dollar will result in a change in the U.S. dollar value of securities denominated in that foreign currency and in the value of any income or distributions the Fund may receive on those securities. The value of foreign investments may be affected by exchange control regulations, foreign taxes, higher transaction and other costs, delays in the settlement of transactions, changes in economic or monetary policy in the United States or abroad, expropriation or nationalization of a company's assets, or other political and economic factors. These risks may be greater for investments in developing or emerging market countries.

The Fund can invest up to 20% of its total assets in Senior Loans that are made to foreign borrowers, or in other securities issued by foreign entities. The Fund's foreign Senior Loans must be dollar-denominated, and interest and principal payments must be payable in U.S. dollars, which may reduce risks of currency fluctuations on the values of those Senior Loans.

Main Risks of Derivative Investments. Derivatives may involve significant risks. Some derivatives have the potential for unlimited loss, regardless of the size of the Fund's initial investment. Derivatives may be illiquid and may be more volatile than other types of investments. Derivative investments can increase portfolio turnover and transaction costs. Derivatives are subject to counter-party credit risk and may lose money if the issuer fails to pay the amounts due.

Main Risks of Concentration in Financial Services. The Fund cannot invest 25% or more of its total assets in an industry, except that it may invest 25% or more of its total assets in securities of the group of industries in the financial services sector. Financial services industries may be more susceptible to particular economic and regulatory events such as volatility in the financial markets and interest rates, changes in domestic and foreign monetary policy, and changes in industry regulations.

Who is the Fund Designed For? The Fund is designed for investors seeking to participate in the market for Senior Loans, which have very large minimum investments, typically $1 million or more, and may have higher risks than conventional debt securities. Those investors should be willing to assume the greater risks of short-term share price fluctuations and the special credit risks that are typical for a fund that invests mainly in lower grade fixed income securities. The Fund is not designed for investors needing an assured level of current income. The Fund is intended to be a long-term investment, not a short-term trading vehicle. The Fund is not a complete investment program. You should carefully consider your own investment goals and risk tolerance before investing in the Fund.

An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The Fund's Past Performance. The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance (for Class A Shares) from year to year and by showing how the Fund's average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance. The Fund's past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. More recent performance information is available by calling the toll-free number on the back of this prospectus and on the Fund's website: https://www.oppenheimerfunds.com/fund/SeniorFloatingRateFund

Sales charges and taxes are not included and the returns would be lower if they were. During the period shown, the highest return for a calendar quarter was 21.88% (2nd Qtr 09) and the lowest return was -22.89% (4th Qtr 08). For the period from January 1, 2012 through September 30, 2012 the cumulative return before sales charges and taxes was 6.88%.

Average Annual Total Returns for the periods ended December 31, 2011

The following table shows the average annual total returns for each class of the Fund's shares. After-tax returns are calculated using the highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes. Your actual after-tax returns, depending on your individual tax situation, may differ from those shown and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only one class and after-tax returns for other classes will vary.

Performance information for Classes N and I shares will be provided after those shares have one full calendar year of performance.

Average Annual Total Returns (Oppenheimer Senior Floating Rate Fund)		Inception Date	1 Year	5 Years	10 Years
Class A		Sep. 08, 1999	(1.21%)	2.81%	4.68%
Class A Return After Taxes on Distributions			(2.09%)	0.59%	2.49%
Class A Return After Taxes on Distributions and Sale of Fund Shares			0.14%	1.11%	2.70%
Class B		Sep. 08, 1999	(1.20%)	2.72%	4.71%
Class C		Sep. 08, 1999	0.91%	3.04%	4.53%
Class Y		Nov. 28, 2005	2.62%	3.76%	4.42%
Credit Suisse Leveraged Loan Index			1.82%	3.32%	4.70%
Credit Suisse Leveraged Loan Index (reflects no deduction for fees, expenses or taxes)	[1]				4.01%

[1] Estimated expenses for the first full year that Class N and Class I shares are offered. Class N and Class I shares will first be offered on the date of this prospectus.

[2] The Manager has voluntarily agreed to waive fees and/or reimburse Fund expenses in an amount equal to the indirect management fees incurred through the Fund's investment in funds managed by the Manager or its affiliates. This expense limitation may not be amended or withdrawn until one year from the date of this prospectus.

[1] Based on estimated expenses for Class N and Class I shares for the first full fiscal year.

[1] Based on estimated expenses for Class N and Class I shares for the first full fiscal year.

[1] From 11-30-05

XML

Shareholder Fees (dei_DocumentInformationDocumentAxis, (Oppenheimer Senior Floating Rate Fund))	0 Months Ended
	Oct. 26, 2012
Class A
Shareholder Fees:
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	3.50%
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none
Class B
Shareholder Fees:
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	3.00%
Class C
Shareholder Fees:
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	1.00%
Class I
Shareholder Fees:
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none
Class N
Shareholder Fees:
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	1.00%
Class Y
Shareholder Fees:
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none

XML

(Oppenheimer Senior Floating Rate Fund)

Investment Objective. The Fund seeks income.

Fees and Expenses of the Fund. This table describes the fees and expenses that you may pay if you buy and hold or redeem shares of the Fund. You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $100,000 in certain funds in the Oppenheimer family of funds. More information about these and other discounts is available from your financial professional and in the section "About Your Account" beginning on page 15 of the prospectus and in the sections "How to Buy Shares" beginning on page 58 and "Appendix A" in the Fund's Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees (Oppenheimer Senior Floating Rate Fund)	Class A	Class B	Class C	Class N	Class Y	Class I
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	3.50%	none	none	none	none	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none	3.00%	1.00%	1.00%	none	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):

Annual Fund Operating Expenses (Oppenheimer Senior Floating Rate Fund)		Class A	Class B	Class C	Class N		Class Y	Class I
Management Fees		0.61%	0.61%	0.61%	0.61%	[1]	0.61%	0.61%	[1]
Distribution and/or Service (12b-1) Fees		0.25%	0.75%	0.75%	0.50%	[1]	none	none	[1]
Total Other Expenses		0.31%	0.44%	0.27%	0.46%	[1]	0.29%	0.18%	[1]
Interest and Fees from Borrowings		0.11%	0.11%	0.11%	0.11%	[1]	0.11%	0.11%	[1]
Other Expenses		0.20%	0.33%	0.16%	0.35%	[1]	0.18%	0.07%	[1]
Acquired Fund Fees and Expenses		0.01%	0.01%	0.01%	0.01%	[1]	0.01%	0.01%	[1]
Total Annual Fund Operating Expenses		1.18%	1.81%	1.64%	1.58%	[1]	0.91%	0.80%	[1]
Fee Waiver and/or Expense Reimbursement	[2]	(0.01%)	(0.01%)	(0.01%)	(0.01%)	[1]	(0.01%)	(0.01%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		1.17%	1.80%	1.63%	1.57%	[1]	0.90%	0.79%	[1]

Example. The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in a class of shares of the Fund for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your expenses would be as follows:

If shares are redeemed

Expense Example (Oppenheimer Senior Floating Rate Fund) (USD $)		1 Year	3 Years	5 Years	10 Years
Class A		466	713	979	1,739
Class B		485	724	1,088	1,823
Class C		267	520	898	1,958
Class N	[1]	261	502	866	1,892
Class Y		92	290	505	1,124
Class I	[1]	81	255	445	993

If shares are not redeemed

Expense Example, No Redemption (Oppenheimer Senior Floating Rate Fund) (USD $)		1 Year	3 Years	5 Years	10 Years
Class A		466	713	979	1,739
Class B		185	574	988	1,823
Class C		167	520	898	1,958
Class N	[1]	161	502	866	1,892
Class Y		92	290	505	1,124
Class I	[1]	81	255	445	993

Portfolio Turnover. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 54% of the average value of its portfolio.

Principal Investment Strategies. The Fund invests mainly in floating rate loans (sometimes referred to as "adjustable rate loans") that hold a senior position in the capital structure of U.S. and foreign corporations, partnerships or other business entities that, under normal circumstances, allow them to have priority of claim ahead of other obligations of a borrower in the event of liquidation. These investments are referred to as "Senior Loans." Senior Loans may be collateralized or uncollateralized. They pay interest at rates that float above, or are adjusted periodically based on, a benchmark that reflects current interest rates.

Under normal market conditions, the Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in Senior Loans. This non-fundamental investment policy will not be changed without 60 days' advance notice to shareholders. The Fund may invest in Senior Loans directly as an original lender, or by assignment from a lender, or it may invest indirectly through loan participation agreements. While most of these Senior Loans will be collateralized, the Fund can also invest up to 10% of its net assets (plus the amount of borrowings for investment purposes) in uncollateralized Senior Loans. The Fund can invest up to 20% of its net assets in cash or other loans and securities, such as: secured or unsecured fixed-rate loans, fixed or floating rate notes or bonds, securities issued or guaranteed by the U.S. government or its agencies or instrumentalities, investment-grade short-term debt obligations and common stock and other equity securities. The Fund also may invest in Senior Loans made in connection with highly leveraged transactions, including but not limited to, operating loans, leveraged buyout loans, and leveraged capitalization loans. The Fund can invest 25% or more of its total assets in securities of the group of industries in the financial services sector.

The Fund can invest in investment-grade or below-investment grade debt instruments (sometimes referred to as "junk bonds"). The Fund can invest up to 100% of its asets in debt instruments rated below investment-grade, and will normally invest a substantial portion of its assets in those securities. "Investment grade" debt instruments are rated in one of the top four categories by nationally recognized statistical rating organizations such as Moody's or Standard & Poor's. The Fund may also invest in unrated instruments, in which case the Manager may internally assign ratings to certain of those instruments, after assessing their credit quality, in categories similar to those of nationally recognized statistical rating organizations. Although it can also invest in investments rated below "B" the Fund will principally invest in debt obligations, including Senior Loans, that are rated "B" (which are below investment-grade) or higher by one or more of the rating organizations or, if unrated, determined by the Manager to be of comparable quality.

The Fund may invest in securities of U.S. and foreign issuers. The Fund can invest up to 20% of its total assets in Senior Loans or other securities issued by foreign entities. The Fund's foreign Senior Loans must be dollar-denominated, and interest and principal payments must be payable in U.S. dollars, which may reduce the risks of currency fluctuations.

The Fund has no requirements as to the range of maturities of the debt instruments it can buy or as to the market capitalization of the issuers of those instruments. The Fund can borrow up to one-third of the Fund's assets (including the amount borrowed) and use other techniques to manage its cash flow, to redeem shares, or to purchase assets, a technique referred to as "leverage." The Fund may also use certain types of derivative investments to try to enhance income or to try to manage ("hedge") investment risks, including, but not limited to, options, futures contracts, swaps, and "structured" notes.

In selecting investments for the Fund, the portfolio managers evaluate overall investment opportunities and risks among the types of investments the Fund can hold. They analyze the credit standing and risks of borrowers whose loans or debt securities they are considering for the Fund's portfolio. They evaluate information about borrowers from their own research or research supplied by rating organizations, agent banks or other sources and select only those loans that they believe are likely to pay the interest and repay the principal when it becomes due. The portfolio managers consider many factors, including, among others,

• the borrower's past and expected future financial performance

• the experience and depth of the borrower's management

• the status of the borrower's industry and its position in that industry

• the collateral for the loan or other debt security

• the borrower's assets and cash flows

• the credit quality of the debt obligations of the bank servicing the loan and other intermediaries imposed between the borrower and the Fund.

There can be no assurance that the Manager's analysis will identify all of the factors that may impair the value of a Senior Loan or other investment.

Principal Risks. The price of the Fund's shares can go up and down substantially. The value of the Fund's investments may change because of broad changes in the markets in which the Fund invests or because of poor investment selection, which could cause the Fund to underperform other funds with similar investment objectives. There is no assurance that the Fund will achieve its investment objective. When you redeem your shares, they may be worth more or less than what you paid for them. These risks mean that you can lose money by investing in the Fund.

Main Risks of Debt Securities. Debt securities may be subject to credit risk, interest rate risk, prepayment risk and extension risk. Credit risk is the risk that the issuer of a security might not make interest and principal payments on the security as they become due. If an issuer fails to pay interest or repay principal, the Fund's income or share value might be reduced. Adverse news about an issuer or a downgrade in an issuer's credit rating, for any reason, can also reduce the market value of the issuer's securities. Interest rate risk is the risk that when prevailing interest rates fall, the values of already-issued debt securities generally rise; and when prevailing interest rates rise, the values of already-issued debt securities generally fall, and they may be worth less than the amount the Fund paid for them. When interest rates change, the values of longer-term debt securities usually change more than the values of shorter-term debt securities.

When interest rates fall, debt securities may be repaid more quickly than expected and the Fund may be required to reinvest the proceeds at a lower interest rate. This is referred to as "prepayment risk." When interest rates rise, debt securities may be repaid more slowly than expected and the value of the Fund's holdings may fall sharply. This is referred to as "extension risk." Interest rate changes normally have different effects on variable or floating rate securities than they do on securities with fixed interest rates.

Certain Senior Loans have a feature that prevents their interest rates from adjusting below a specified minimum level. When short term interest rates are low, this feature could result in the interest rates of these Senior Loans becoming fixed at the applicable minimum level until short term interest rates rise above that level. Although this feature is intended to result in these Senior Loans yielding more than they otherwise would when short term interest rates are low, the feature might also result in the prices of these Senior Loans becoming more sensitive to changes in interest rates should short term interest rates rise but remain below the applicable minimum level.

Fixed Income Market Risks . Developments relating to subprime mortgages have adversely affected fixed-income securities markets in the United States, Europe and elsewhere. The values of many types of debt securities have been reduced, including debt securities that are not related to mortgage loans. In addition, broker-dealers and other market participants have been less willing to make a market in some types of debt instruments, which has impacted the liquidity of those instruments. These developments also have had a negative effect on the broader economy. There is a risk that a lack of liquidity or other adverse credit market conditions may hamper the Fund's ability to sell the debt securities in which it invests or to find and purchase suitable debt instruments.

Special Risks of Lower-Grade Securities. Lower-grade debt securities, whether rated or unrated, have greater risks than investment-grade securities. They may be subject to greater price fluctuations and have a greater risk that the issuer might not be able to pay interest and principal when due. The market for lower-grade securities may be less liquid and therefore they may be harder to value or to sell at an acceptable price, especially during times of market volatility or decline.

Special Risks of Senior Loans . In addition to the risks typically associated with debt securities, such as credit and interest rate risk discussed above, Senior Loans are also subject to the risk that a court could subordinate a Senior Loan, which typically holds a senior position in the capital structure of a borrower, to presently existing or future indebtedness or take other action detrimental to the holders of Senior Loans. Senior Loans usually have mandatory and optional prepayment provisions. If a borrower prepays a Senior Loan, the fund will have to reinvest the proceeds in other Senior Loans or securities that may pay lower interest rates.

Most, but not all, of the Fund's investments in Senior Loans must be collateralized, however, the Fund's other investments need not be collateralized. Senior Loans are subject to the risk that the value of the collateral, if any, securing a loan may decline, be insufficient to meet the obligations of the borrower, or be difficult to liquidate. In the event of a default, the Fund may have difficulty collecting on any collateral and would not have the ability to collect on any collateral for an uncollateralized loan. In addition, any collateral may be found invalid or may be used to pay other outstanding obligations of the borrower. The Fund's access to collateral, if any, may be limited by bankruptcy, other insolvency laws, or by the type of loan the fund has purchased. As a result, a collateralized Senior Loan may not be fully collateralized and can decline significantly in value.

Loan investments are often issued in connection with highly leveraged transactions. Such transactions include leveraged buyout loans, leveraged recapitalization loans, and other types of acquisition financing. These obligations are subject to greater credit risks than other investments including a greater possibility that the borrower may default or enter bankruptcy.

Due to restrictions on transfers in loan agreements and the nature of the private syndication of Senior Loans including, for example, the lack of publicly-available information, some Senior Loans are not as easily purchased or sold as publicly-traded securities. Some Senior Loans and other Fund investments are illiquid, which may make it difficult for the Fund to value them or dispose of them at an acceptable price when it wants to. Direct investments in Senior Loans and, to a lesser degree, investments in participation interests in or assignments of Senior Loans may be limited. There is a risk that the Fund may not be able to invest a sufficient amount in Senior Loans at all times to meet its 80% asset investment requirement. Investments in Senior Loans are expected to be less affected by changes in interest rates than fixed-rate securities.

Main Risks of Borrowing and Leverage. The Fund can borrow up to one-third of the value of its total assets (including the amount borrowed) from banks, as permitted by the Investment Company Act of 1940. It can use those borrowings for a number of purposes, including for purchasing Senior Loans or other securities, which can create "leverage." In that case, changes in the value of the Fund's investments will have a larger effect on its share price than if it did not borrow. Borrowing results in interest payments to the lenders and related expenses. Borrowing for investment purposes might reduce the Fund's return if the yield on the investments purchased is less than those borrowing costs. The Fund may also borrow to meet redemption obligations or for temporary and emergency purposes. The Fund currently participates in a line of credit with certain banks as lenders.

Main Risks of Foreign Investing. Foreign securities are subject to special risks. Foreign issuers are usually not subject to the same accounting and disclosure requirements that U.S. companies are subject to, which may make it difficult for the Fund to evaluate a foreign company's operations or financial condition. A change in the value of a foreign currency against the U.S. dollar will result in a change in the U.S. dollar value of securities denominated in that foreign currency and in the value of any income or distributions the Fund may receive on those securities. The value of foreign investments may be affected by exchange control regulations, foreign taxes, higher transaction and other costs, delays in the settlement of transactions, changes in economic or monetary policy in the United States or abroad, expropriation or nationalization of a company's assets, or other political and economic factors. These risks may be greater for investments in developing or emerging market countries.

The Fund can invest up to 20% of its total assets in Senior Loans that are made to foreign borrowers, or in other securities issued by foreign entities. The Fund's foreign Senior Loans must be dollar-denominated, and interest and principal payments must be payable in U.S. dollars, which may reduce risks of currency fluctuations on the values of those Senior Loans.

Main Risks of Derivative Investments. Derivatives may involve significant risks. Some derivatives have the potential for unlimited loss, regardless of the size of the Fund's initial investment. Derivatives may be illiquid and may be more volatile than other types of investments. Derivative investments can increase portfolio turnover and transaction costs. Derivatives are subject to counter-party credit risk and may lose money if the issuer fails to pay the amounts due.

Main Risks of Concentration in Financial Services. The Fund cannot invest 25% or more of its total assets in an industry, except that it may invest 25% or more of its total assets in securities of the group of industries in the financial services sector. Financial services industries may be more susceptible to particular economic and regulatory events such as volatility in the financial markets and interest rates, changes in domestic and foreign monetary policy, and changes in industry regulations.

Who is the Fund Designed For? The Fund is designed for investors seeking to participate in the market for Senior Loans, which have very large minimum investments, typically $1 million or more, and may have higher risks than conventional debt securities. Those investors should be willing to assume the greater risks of short-term share price fluctuations and the special credit risks that are typical for a fund that invests mainly in lower grade fixed income securities. The Fund is not designed for investors needing an assured level of current income. The Fund is intended to be a long-term investment, not a short-term trading vehicle. The Fund is not a complete investment program. You should carefully consider your own investment goals and risk tolerance before investing in the Fund.

An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The Fund's Past Performance. The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance (for Class A Shares) from year to year and by showing how the Fund's average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance. The Fund's past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. More recent performance information is available by calling the toll-free number on the back of this prospectus and on the Fund's website: https://www.oppenheimerfunds.com/fund/SeniorFloatingRateFund

Sales charges and taxes are not included and the returns would be lower if they were. During the period shown, the highest return for a calendar quarter was 21.88% (2nd Qtr 09) and the lowest return was -22.89% (4th Qtr 08). For the period from January 1, 2012 through September 30, 2012 the cumulative return before sales charges and taxes was 6.88%.

Average Annual Total Returns for the periods ended December 31, 2011

The following table shows the average annual total returns for each class of the Fund's shares. After-tax returns are calculated using the highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes. Your actual after-tax returns, depending on your individual tax situation, may differ from those shown and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only one class and after-tax returns for other classes will vary.

Performance information for Classes N and I shares will be provided after those shares have one full calendar year of performance.

Average Annual Total Returns (Oppenheimer Senior Floating Rate Fund)		Inception Date	1 Year	5 Years	10 Years
Class A		Sep. 08, 1999	(1.21%)	2.81%	4.68%
Class A Return After Taxes on Distributions			(2.09%)	0.59%	2.49%
Class A Return After Taxes on Distributions and Sale of Fund Shares			0.14%	1.11%	2.70%
Class B		Sep. 08, 1999	(1.20%)	2.72%	4.71%
Class C		Sep. 08, 1999	0.91%	3.04%	4.53%
Class Y		Nov. 28, 2005	2.62%	3.76%	4.42%
Credit Suisse Leveraged Loan Index			1.82%	3.32%	4.70%
Credit Suisse Leveraged Loan Index (reflects no deduction for fees, expenses or taxes)	[1]				4.01%

[1] Estimated expenses for the first full year that Class N and Class I shares are offered. Class N and Class I shares will first be offered on the date of this prospectus.

[2] The Manager has voluntarily agreed to waive fees and/or reimburse Fund expenses in an amount equal to the indirect management fees incurred through the Fund's investment in funds managed by the Manager or its affiliates. This expense limitation may not be amended or withdrawn until one year from the date of this prospectus.

[1] Based on estimated expenses for Class N and Class I shares for the first full fiscal year.

[1] Based on estimated expenses for Class N and Class I shares for the first full fiscal year.

[1] From 11-30-05

XML

Average Annual Total Returns (dei_DocumentInformationDocumentAxis, (Oppenheimer Senior Floating Rate Fund))	0 Months Ended
	Oct. 26, 2012
Credit Suisse Leveraged Loan Index
Average Annual Return:
1 Year	1.82%
5 Years	3.32%
10 Years	4.70%
Credit Suisse Leveraged Loan Index (reflects no deduction for fees, expenses or taxes)
Average Annual Return:
10 Years	4.01%	[1]
Class A
Average Annual Return:
1 Year	(1.21%)
5 Years	2.81%
10 Years	4.68%
Inception Date	Sep. 08, 1999
Class A | Return After Taxes on Distributions
Average Annual Return:
1 Year	(2.09%)
5 Years	0.59%
10 Years	2.49%
Class A | Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return:
1 Year	0.14%
5 Years	1.11%
10 Years	2.70%
Class B
Average Annual Return:
1 Year	(1.20%)
5 Years	2.72%
10 Years	4.71%
Inception Date	Sep. 08, 1999
Class C
Average Annual Return:
1 Year	0.91%
5 Years	3.04%
10 Years	4.53%
Inception Date	Sep. 08, 1999
Class Y
Average Annual Return:
1 Year	2.62%
5 Years	3.76%
10 Years	4.42%
Inception Date	Nov. 28, 2005

[1] From 11-30-05

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Document Type

dei_DocumentType

485BPOS

Document Period End Date

dei_DocumentPeriodEndDate

Jul. 31, 2012

Registrant Name

dei_EntityRegistrantName

OPPENHEIMER SENIOR FLOATING RATE FUND

Central Index Key

dei_EntityCentralIndexKey

0001087774

Amendment Flag

dei_AmendmentFlag

false

Document Creation Date

dei_DocumentCreationDate

Oct. 24, 2012

Document Effective Date

dei_DocumentEffectiveDate

Oct. 26, 2012

Prospectus Date

rr_ProspectusDate

Oct. 26, 2012

(Oppenheimer Senior Floating Rate Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Investment Objective. The Fund seeks income.

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

Fees and Expenses of the Fund. This table describes the fees and expenses that you may pay if you buy and hold or redeem shares of the Fund. You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $100,000 in certain funds in the Oppenheimer family of funds. More information about these and other discounts is available from your financial professional and in the section "About Your Account" beginning on page 15 of the prospectus and in the sections "How to Buy Shares" beginning on page 58 and "Appendix A" in the Fund's Statement of Additional Information.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (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 [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 54% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

54.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $100,000 in certain funds in the Oppenheimer family of funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

100,000

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

Example. The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in a class of shares of the Fund for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your expenses would be as follows:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

If shares are redeemed

Expense Example, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

If shares are not redeemed

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Principal Investment Strategies. The Fund invests mainly in floating rate loans (sometimes referred to as "adjustable rate loans") that hold a senior position in the capital structure of U.S. and foreign corporations, partnerships or other business entities that, under normal circumstances, allow them to have priority of claim ahead of other obligations of a borrower in the event of liquidation. These investments are referred to as "Senior Loans." Senior Loans may be collateralized or uncollateralized. They pay interest at rates that float above, or are adjusted periodically based on, a benchmark that reflects current interest rates.

Under normal market conditions, the Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in Senior Loans. This non-fundamental investment policy will not be changed without 60 days' advance notice to shareholders. The Fund may invest in Senior Loans directly as an original lender, or by assignment from a lender, or it may invest indirectly through loan participation agreements. While most of these Senior Loans will be collateralized, the Fund can also invest up to 10% of its net assets (plus the amount of borrowings for investment purposes) in uncollateralized Senior Loans. The Fund can invest up to 20% of its net assets in cash or other loans and securities, such as: secured or unsecured fixed-rate loans, fixed or floating rate notes or bonds, securities issued or guaranteed by the U.S. government or its agencies or instrumentalities, investment-grade short-term debt obligations and common stock and other equity securities. The Fund also may invest in Senior Loans made in connection with highly leveraged transactions, including but not limited to, operating loans, leveraged buyout loans, and leveraged capitalization loans. The Fund can invest 25% or more of its total assets in securities of the group of industries in the financial services sector.

The Fund can invest in investment-grade or below-investment grade debt instruments (sometimes referred to as "junk bonds"). The Fund can invest up to 100% of its asets in debt instruments rated below investment-grade, and will normally invest a substantial portion of its assets in those securities. "Investment grade" debt instruments are rated in one of the top four categories by nationally recognized statistical rating organizations such as Moody's or Standard & Poor's. The Fund may also invest in unrated instruments, in which case the Manager may internally assign ratings to certain of those instruments, after assessing their credit quality, in categories similar to those of nationally recognized statistical rating organizations. Although it can also invest in investments rated below "B" the Fund will principally invest in debt obligations, including Senior Loans, that are rated "B" (which are below investment-grade) or higher by one or more of the rating organizations or, if unrated, determined by the Manager to be of comparable quality.

The Fund may invest in securities of U.S. and foreign issuers. The Fund can invest up to 20% of its total assets in Senior Loans or other securities issued by foreign entities. The Fund's foreign Senior Loans must be dollar-denominated, and interest and principal payments must be payable in U.S. dollars, which may reduce the risks of currency fluctuations.

The Fund has no requirements as to the range of maturities of the debt instruments it can buy or as to the market capitalization of the issuers of those instruments. The Fund can borrow up to one-third of the Fund's assets (including the amount borrowed) and use other techniques to manage its cash flow, to redeem shares, or to purchase assets, a technique referred to as "leverage." The Fund may also use certain types of derivative investments to try to enhance income or to try to manage ("hedge") investment risks, including, but not limited to, options, futures contracts, swaps, and "structured" notes.

In selecting investments for the Fund, the portfolio managers evaluate overall investment opportunities and risks among the types of investments the Fund can hold. They analyze the credit standing and risks of borrowers whose loans or debt securities they are considering for the Fund's portfolio. They evaluate information about borrowers from their own research or research supplied by rating organizations, agent banks or other sources and select only those loans that they believe are likely to pay the interest and repay the principal when it becomes due. The portfolio managers consider many factors, including, among others,

• the borrower's past and expected future financial performance

• the experience and depth of the borrower's management

• the status of the borrower's industry and its position in that industry

• the collateral for the loan or other debt security

• the borrower's assets and cash flows

• the credit quality of the debt obligations of the bank servicing the loan and other intermediaries imposed between the borrower and the Fund.

There can be no assurance that the Manager's analysis will identify all of the factors that may impair the value of a Senior Loan or other investment.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Principal Risks. The price of the Fund's shares can go up and down substantially. The value of the Fund's investments may change because of broad changes in the markets in which the Fund invests or because of poor investment selection, which could cause the Fund to underperform other funds with similar investment objectives. There is no assurance that the Fund will achieve its investment objective. When you redeem your shares, they may be worth more or less than what you paid for them. These risks mean that you can lose money by investing in the Fund.

Main Risks of Debt Securities. Debt securities may be subject to credit risk, interest rate risk, prepayment risk and extension risk. Credit risk is the risk that the issuer of a security might not make interest and principal payments on the security as they become due. If an issuer fails to pay interest or repay principal, the Fund's income or share value might be reduced. Adverse news about an issuer or a downgrade in an issuer's credit rating, for any reason, can also reduce the market value of the issuer's securities. Interest rate risk is the risk that when prevailing interest rates fall, the values of already-issued debt securities generally rise; and when prevailing interest rates rise, the values of already-issued debt securities generally fall, and they may be worth less than the amount the Fund paid for them. When interest rates change, the values of longer-term debt securities usually change more than the values of shorter-term debt securities.

When interest rates fall, debt securities may be repaid more quickly than expected and the Fund may be required to reinvest the proceeds at a lower interest rate. This is referred to as "prepayment risk." When interest rates rise, debt securities may be repaid more slowly than expected and the value of the Fund's holdings may fall sharply. This is referred to as "extension risk." Interest rate changes normally have different effects on variable or floating rate securities than they do on securities with fixed interest rates.

Certain Senior Loans have a feature that prevents their interest rates from adjusting below a specified minimum level. When short term interest rates are low, this feature could result in the interest rates of these Senior Loans becoming fixed at the applicable minimum level until short term interest rates rise above that level. Although this feature is intended to result in these Senior Loans yielding more than they otherwise would when short term interest rates are low, the feature might also result in the prices of these Senior Loans becoming more sensitive to changes in interest rates should short term interest rates rise but remain below the applicable minimum level.

Fixed Income Market Risks . Developments relating to subprime mortgages have adversely affected fixed-income securities markets in the United States, Europe and elsewhere. The values of many types of debt securities have been reduced, including debt securities that are not related to mortgage loans. In addition, broker-dealers and other market participants have been less willing to make a market in some types of debt instruments, which has impacted the liquidity of those instruments. These developments also have had a negative effect on the broader economy. There is a risk that a lack of liquidity or other adverse credit market conditions may hamper the Fund's ability to sell the debt securities in which it invests or to find and purchase suitable debt instruments.

Special Risks of Lower-Grade Securities. Lower-grade debt securities, whether rated or unrated, have greater risks than investment-grade securities. They may be subject to greater price fluctuations and have a greater risk that the issuer might not be able to pay interest and principal when due. The market for lower-grade securities may be less liquid and therefore they may be harder to value or to sell at an acceptable price, especially during times of market volatility or decline.

Special Risks of Senior Loans . In addition to the risks typically associated with debt securities, such as credit and interest rate risk discussed above, Senior Loans are also subject to the risk that a court could subordinate a Senior Loan, which typically holds a senior position in the capital structure of a borrower, to presently existing or future indebtedness or take other action detrimental to the holders of Senior Loans. Senior Loans usually have mandatory and optional prepayment provisions. If a borrower prepays a Senior Loan, the fund will have to reinvest the proceeds in other Senior Loans or securities that may pay lower interest rates.

Most, but not all, of the Fund's investments in Senior Loans must be collateralized, however, the Fund's other investments need not be collateralized. Senior Loans are subject to the risk that the value of the collateral, if any, securing a loan may decline, be insufficient to meet the obligations of the borrower, or be difficult to liquidate. In the event of a default, the Fund may have difficulty collecting on any collateral and would not have the ability to collect on any collateral for an uncollateralized loan. In addition, any collateral may be found invalid or may be used to pay other outstanding obligations of the borrower. The Fund's access to collateral, if any, may be limited by bankruptcy, other insolvency laws, or by the type of loan the fund has purchased. As a result, a collateralized Senior Loan may not be fully collateralized and can decline significantly in value.

Loan investments are often issued in connection with highly leveraged transactions. Such transactions include leveraged buyout loans, leveraged recapitalization loans, and other types of acquisition financing. These obligations are subject to greater credit risks than other investments including a greater possibility that the borrower may default or enter bankruptcy.

Due to restrictions on transfers in loan agreements and the nature of the private syndication of Senior Loans including, for example, the lack of publicly-available information, some Senior Loans are not as easily purchased or sold as publicly-traded securities. Some Senior Loans and other Fund investments are illiquid, which may make it difficult for the Fund to value them or dispose of them at an acceptable price when it wants to. Direct investments in Senior Loans and, to a lesser degree, investments in participation interests in or assignments of Senior Loans may be limited. There is a risk that the Fund may not be able to invest a sufficient amount in Senior Loans at all times to meet its 80% asset investment requirement. Investments in Senior Loans are expected to be less affected by changes in interest rates than fixed-rate securities.

Main Risks of Borrowing and Leverage. The Fund can borrow up to one-third of the value of its total assets (including the amount borrowed) from banks, as permitted by the Investment Company Act of 1940. It can use those borrowings for a number of purposes, including for purchasing Senior Loans or other securities, which can create "leverage." In that case, changes in the value of the Fund's investments will have a larger effect on its share price than if it did not borrow. Borrowing results in interest payments to the lenders and related expenses. Borrowing for investment purposes might reduce the Fund's return if the yield on the investments purchased is less than those borrowing costs. The Fund may also borrow to meet redemption obligations or for temporary and emergency purposes. The Fund currently participates in a line of credit with certain banks as lenders.

Main Risks of Foreign Investing. Foreign securities are subject to special risks. Foreign issuers are usually not subject to the same accounting and disclosure requirements that U.S. companies are subject to, which may make it difficult for the Fund to evaluate a foreign company's operations or financial condition. A change in the value of a foreign currency against the U.S. dollar will result in a change in the U.S. dollar value of securities denominated in that foreign currency and in the value of any income or distributions the Fund may receive on those securities. The value of foreign investments may be affected by exchange control regulations, foreign taxes, higher transaction and other costs, delays in the settlement of transactions, changes in economic or monetary policy in the United States or abroad, expropriation or nationalization of a company's assets, or other political and economic factors. These risks may be greater for investments in developing or emerging market countries.

The Fund can invest up to 20% of its total assets in Senior Loans that are made to foreign borrowers, or in other securities issued by foreign entities. The Fund's foreign Senior Loans must be dollar-denominated, and interest and principal payments must be payable in U.S. dollars, which may reduce risks of currency fluctuations on the values of those Senior Loans.

Main Risks of Derivative Investments. Derivatives may involve significant risks. Some derivatives have the potential for unlimited loss, regardless of the size of the Fund's initial investment. Derivatives may be illiquid and may be more volatile than other types of investments. Derivative investments can increase portfolio turnover and transaction costs. Derivatives are subject to counter-party credit risk and may lose money if the issuer fails to pay the amounts due.

Main Risks of Concentration in Financial Services. The Fund cannot invest 25% or more of its total assets in an industry, except that it may invest 25% or more of its total assets in securities of the group of industries in the financial services sector. Financial services industries may be more susceptible to particular economic and regulatory events such as volatility in the financial markets and interest rates, changes in domestic and foreign monetary policy, and changes in industry regulations.

Who is the Fund Designed For? The Fund is designed for investors seeking to participate in the market for Senior Loans, which have very large minimum investments, typically $1 million or more, and may have higher risks than conventional debt securities. Those investors should be willing to assume the greater risks of short-term share price fluctuations and the special credit risks that are typical for a fund that invests mainly in lower grade fixed income securities. The Fund is not designed for investors needing an assured level of current income. The Fund is intended to be a long-term investment, not a short-term trading vehicle. The Fund is not a complete investment program. You should carefully consider your own investment goals and risk tolerance before investing in the Fund.

An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

The price of the Fund's shares can go up and down substantially. The value of the Fund's investments may change because of broad changes in the markets in which the Fund invests or because of poor investment selection, which could cause the Fund to underperform other funds with similar investment objectives. There is no assurance that the Fund will achieve its investment objective. When you redeem your shares, they may be worth more or less than what you paid for them. These risks mean that you can lose money by investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The Fund's Past Performance. The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance (for Class A Shares) from year to year and by showing how the Fund's average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance. The Fund's past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. More recent performance information is available by calling the toll-free number on the back of this prospectus and on the Fund's website: https://www.oppenheimerfunds.com/fund/SeniorFloatingRateFund

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

https://www.oppenheimerfunds.com/fund/SeniorFloatingRateFund

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The Fund's past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Sales charges and taxes are not included and the returns would be lower if they were. During the period shown, the highest return for a calendar quarter was 21.88% (2nd Qtr 09) and the lowest return was -22.89% (4th Qtr 08). For the period from January 1, 2012 through September 30, 2012 the cumulative return before sales charges and taxes was 6.88%.

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns for the periods ended December 31, 2011

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

Your actual after-tax returns, depending on your individual tax situation, may differ from those shown and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown for only one class and after-tax returns for other classes will vary.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

The following table shows the average annual total returns for each class of the Fund's shares. After-tax returns are calculated using the highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes. Your actual after-tax returns, depending on your individual tax situation, may differ from those shown and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only one class and after-tax returns for other classes will vary.

Performance information for Classes N and I shares will be provided after those shares have one full calendar year of performance.

(Oppenheimer Senior Floating Rate Fund) | Credit Suisse Leveraged Loan Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.82%

5 Years

rr_AverageAnnualReturnYear05

3.32%

10 Years

rr_AverageAnnualReturnYear10

4.70%

(Oppenheimer Senior Floating Rate Fund) | Credit Suisse Leveraged Loan Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

10 Years

rr_AverageAnnualReturnYear10

4.01%

^[4]

(Oppenheimer Senior Floating Rate Fund) | Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

3.50%

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.61%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Interest and Fees from Borrowings

rr_Component1OtherExpensesOverAssets

0.11%

Other Expenses

rr_Component2OtherExpensesOverAssets

0.20%

Total Other Expenses

rr_OtherExpensesOverAssets

0.31%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.18%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[2]

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.17%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

466

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

713

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

979

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,739

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

466

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

713

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

979

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,739

Annual Return 2002

rr_AnnualReturn2002

1.92%

Annual Return 2003

rr_AnnualReturn2003

11.23%

Annual Return 2004

rr_AnnualReturn2004

7.20%

Annual Return 2005

rr_AnnualReturn2005

5.64%

Annual Return 2006

rr_AnnualReturn2006

7.11%

Annual Return 2007

rr_AnnualReturn2007

1.52%

Annual Return 2008

rr_AnnualReturn2008

(29.48%)

Annual Return 2009

rr_AnnualReturn2009

43.51%

Annual Return 2010

rr_AnnualReturn2010

13.15%

Annual Return 2011

rr_AnnualReturn2011

2.37%

Year to Date Return, Label

rr_YearToDateReturnLabel

For the period from January 1, 2012 through September 30, 2012 the cumulative return before sales charges and taxes was 6.88%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

6.88%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest return for a calendar quarter was 21.88% (2nd Qtr 09)

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

21.88%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest return was -22.89% (4th Qtr 08)

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.89%)

1 Year

rr_AverageAnnualReturnYear01

(1.21%)

5 Years

rr_AverageAnnualReturnYear05

2.81%

10 Years

rr_AverageAnnualReturnYear10

4.68%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 08, 1999

(Oppenheimer Senior Floating Rate Fund) | Class A | Return After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(2.09%)

5 Years

rr_AverageAnnualReturnYear05

0.59%

10 Years

rr_AverageAnnualReturnYear10

2.49%

(Oppenheimer Senior Floating Rate Fund) | Class A | Return After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

0.14%

5 Years

rr_AverageAnnualReturnYear05

1.11%

10 Years

rr_AverageAnnualReturnYear10

2.70%

(Oppenheimer Senior Floating Rate Fund) | Class B

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

3.00%

Management Fees

rr_ManagementFeesOverAssets

0.61%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.75%

Interest and Fees from Borrowings

rr_Component1OtherExpensesOverAssets

0.11%

Other Expenses

rr_Component2OtherExpensesOverAssets

0.33%

Total Other Expenses

rr_OtherExpensesOverAssets

0.44%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.81%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[2]

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.80%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

485

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

724

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,088

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,823

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

185

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

574

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

988

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,823

1 Year

rr_AverageAnnualReturnYear01

(1.20%)

5 Years

rr_AverageAnnualReturnYear05

2.72%

10 Years

rr_AverageAnnualReturnYear10

4.71%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 08, 1999

(Oppenheimer Senior Floating Rate Fund) | Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.61%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.75%

Interest and Fees from Borrowings

rr_Component1OtherExpensesOverAssets

0.11%

Other Expenses

rr_Component2OtherExpensesOverAssets

0.16%

Total Other Expenses

rr_OtherExpensesOverAssets

0.27%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.64%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[2]

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.63%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

267

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

520

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

898

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,958

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

167

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

520

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

898

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,958

1 Year

rr_AverageAnnualReturnYear01

0.91%

5 Years

rr_AverageAnnualReturnYear05

3.04%

10 Years

rr_AverageAnnualReturnYear10

4.53%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 08, 1999

(Oppenheimer Senior Floating Rate Fund) | Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.61%

^[1]

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Interest and Fees from Borrowings

rr_Component1OtherExpensesOverAssets

0.11%

^[1]

Other Expenses

rr_Component2OtherExpensesOverAssets

0.07%

^[1]

Total Other Expenses

rr_OtherExpensesOverAssets

0.18%

^[1]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

^[1]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.80%

^[1]

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[1],[2]

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.79%

^[1]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

81

^[3]

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

255

^[3]

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

445

^[3]

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

993

^[3]

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

81

^[3]

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

255

^[3]

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

445

^[3]

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

993

^[3]

(Oppenheimer Senior Floating Rate Fund) | Class N

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.61%

^[1]

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

^[1]

Interest and Fees from Borrowings

rr_Component1OtherExpensesOverAssets

0.11%

^[1]

Other Expenses

rr_Component2OtherExpensesOverAssets

0.35%

^[1]

Total Other Expenses

rr_OtherExpensesOverAssets

0.46%

^[1]

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

^[1]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.58%

^[1]

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[1],[2]

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.57%

^[1]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

261

^[3]

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

502

^[3]

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

866

^[3]

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,892

^[3]

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

161

^[3]

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

502

^[3]

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

866

^[3]

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,892

^[3]

(Oppenheimer Senior Floating Rate Fund) | Class Y

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.61%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Interest and Fees from Borrowings

rr_Component1OtherExpensesOverAssets

0.11%

Other Expenses

rr_Component2OtherExpensesOverAssets

0.18%

Total Other Expenses

rr_OtherExpensesOverAssets

0.29%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.91%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[2]

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.90%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

92

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

290

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

505

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,124

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

92

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

290

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

505

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,124

1 Year

rr_AverageAnnualReturnYear01

2.62%

5 Years

rr_AverageAnnualReturnYear05

3.76%

10 Years

rr_AverageAnnualReturnYear10

4.42%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 28, 2005

[1] Estimated expenses for the first full year that Class N and Class I shares are offered. Class N and Class I shares will first be offered on the date of this prospectus.

[2] The Manager has voluntarily agreed to waive fees and/or reimburse Fund expenses in an amount equal to the indirect management fees incurred through the Fund's investment in funds managed by the Manager or its affiliates. This expense limitation may not be amended or withdrawn until one year from the date of this prospectus.

[3] Based on estimated expenses for Class N and Class I shares for the first full fiscal year.

[4] From 11-30-05

XML

Annual Fund Operating Expenses (dei_DocumentInformationDocumentAxis, (Oppenheimer Senior Floating Rate Fund))	0 Months Ended
	Oct. 26, 2012
Class A
Operating Expenses:
Management Fees	0.61%
Distribution and/or Service (12b-1) Fees	0.25%
Interest and Fees from Borrowings	0.11%
Other Expenses	0.20%
Total Other Expenses	0.31%
Acquired Fund Fees and Expenses	0.01%
Total Annual Fund Operating Expenses	1.18%
Fee Waiver and/or Expense Reimbursement	(0.01%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	1.17%
Class B
Operating Expenses:
Management Fees	0.61%
Distribution and/or Service (12b-1) Fees	0.75%
Interest and Fees from Borrowings	0.11%
Other Expenses	0.33%
Total Other Expenses	0.44%
Acquired Fund Fees and Expenses	0.01%
Total Annual Fund Operating Expenses	1.81%
Fee Waiver and/or Expense Reimbursement	(0.01%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	1.80%
Class C
Operating Expenses:
Management Fees	0.61%
Distribution and/or Service (12b-1) Fees	0.75%
Interest and Fees from Borrowings	0.11%
Other Expenses	0.16%
Total Other Expenses	0.27%
Acquired Fund Fees and Expenses	0.01%
Total Annual Fund Operating Expenses	1.64%
Fee Waiver and/or Expense Reimbursement	(0.01%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	1.63%
Class I
Operating Expenses:
Management Fees	0.61%	[2]
Distribution and/or Service (12b-1) Fees	none	[2]
Interest and Fees from Borrowings	0.11%	[2]
Other Expenses	0.07%	[2]
Total Other Expenses	0.18%	[2]
Acquired Fund Fees and Expenses	0.01%	[2]
Total Annual Fund Operating Expenses	0.80%	[2]
Fee Waiver and/or Expense Reimbursement	(0.01%)	[1],[2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	0.79%	[2]
Class N
Operating Expenses:
Management Fees	0.61%	[2]
Distribution and/or Service (12b-1) Fees	0.50%	[2]
Interest and Fees from Borrowings	0.11%	[2]
Other Expenses	0.35%	[2]
Total Other Expenses	0.46%	[2]
Acquired Fund Fees and Expenses	0.01%	[2]
Total Annual Fund Operating Expenses	1.58%	[2]
Fee Waiver and/or Expense Reimbursement	(0.01%)	[1],[2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	1.57%	[2]
Class Y
Operating Expenses:
Management Fees	0.61%
Distribution and/or Service (12b-1) Fees	none
Interest and Fees from Borrowings	0.11%
Other Expenses	0.18%
Total Other Expenses	0.29%
Acquired Fund Fees and Expenses	0.01%
Total Annual Fund Operating Expenses	0.91%
Fee Waiver and/or Expense Reimbursement	(0.01%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	0.90%

[1] The Manager has voluntarily agreed to waive fees and/or reimburse Fund expenses in an amount equal to the indirect management fees incurred through the Fund's investment in funds managed by the Manager or its affiliates. This expense limitation may not be amended or withdrawn until one year from the date of this prospectus.

[2] Estimated expenses for the first full year that Class N and Class I shares are offered. Class N and Class I shares will first be offered on the date of this prospectus.