485BPOS

As filed with the Securities and Exchange Commission on March 21, 2013

Registration Nos. 333-119022; 811-21634

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT

UNDER
THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No.	¨
Post-Effective Amendment No. 33	x
and/or REGISTRATION STATEMENT UNDER
THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 36	x

Access One Trust

(Exact Name of Registrant as Specified in Charter)

7501 Wisconsin Avenue, Suite 1000

Bethesda, Maryland 20814

(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone Number, including Area Code: (240) 497-6400

With copies to:

Michael L. Sapir

ProFund Advisors LLC

7501 Wisconsin Avenue, Suite 1000

Bethesda, MD 20814

(Name and Address of Agent for Service)

With copy to:

John Loder, Esq. c/o Ropes & Gray LLP One International Place Boston, MA 02110 Amy Doberman ProFund Advisors LLC 7501 Wisconsin Avenue, Suite 1000 Bethesda, MD 20814

(Name and Address of Agent for Service Process)

Approximate Date of Commencement of the Proposed Public Offering of the Securities:

It is proposed that this filing will become effective:

x immediately upon filing pursuant to paragraph (b)

¨ on (date) pursuant to paragraph (b)

¨ 60 days after filing pursuant to paragraph (a)(1)

¨ On (date) pursuant to paragraph (a)(1)

¨ 75 days after filing pursuant to paragraph (a)(2)

¨ on (date) pursuant to paragraph (a)(2) of rule 485.

If appropriate, check the following:

¨ 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, Access One Trust certifies that it has met all of the requirements for effectiveness of this Registration Statement under Rule 485(b) under the Securities Act of 1933 and has duly caused this amendment to its Registration Statement on Form N-1A to be signed on its behalf by the undersigned, thereunto duly authorized, in Bethesda, Maryland on March 21, 2013.

ACCESS ONE TRUST

/s/ Louis M. Mayberg

Louis M. Mayberg, President

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

Signatures	Title	Date
/s/ Michael L. Sapir*	Trustee, Chairman	March 21, 2013
Michael L. Sapir
/s/ Russell S. Reynolds, III*	Trustee	March 21, 2013
Russell S. Reynolds, III
/s/ Michael C. Wachs*	Trustee	March 21, 2013
Michael C. Wachs
/s/ William D. Fertig*	Trustee	March 21, 2013
William D. Fertig
/s/ Louis M. Mayberg*	President	March 21, 2013
Louis M. Mayberg
/s/ Christopher E. Sabato*	Treasurer	March 21, 2013
Christopher E. Sabato

*By:	/s/ Amy R. Doberman
	Amy R. Doberman As Attorney-in-fact March 21, 2013

Exhibit Index

EXHIBIT NUMBER	DESCRIPTION
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxomony Extension Presentation Linkbase

XML

ACCESS FLEX BEAR HIGH YIELD FUND

Access Flex Bear High Yield Fund        TICKERS :: Investor Class AFBIX :: Service Class AFBSX

Important Information About the Fund
If Access Flex Bear High Yield Fund (the “Fund”) is successful in meeting its objective, its net asset value should generally lose value as the high yield market (i.e., U.S. corporate high yield debt market) is rallying (gaining value). Conversely, its net asset value should generally increase in value as the high yield market is falling (losing value). These results are generally opposite those of most traditional high yield mutual funds.

Investment Objective

The Fund seeks to provide investment results that correspond generally to the inverse of the total return of the high yield market consistent with maintaining reasonable liquidity.

Fees and Expenses of the Fund

The table below describes the fees and expenses that you may pay if you buy or hold shares of the Fund.

Shareholder Fees
(fees paid directly from your investment)

Shareholder Fees ACCESS FLEX BEAR HIGH YIELD FUND (USD $)	Investor Class	Service Class
Wire Fee	10	10

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

Annual Fund Operating Expenses ACCESS FLEX BEAR HIGH YIELD FUND		Investor Class	Service Class
Investment Advisory Fees		0.75%	0.75%
Distribution and Service (12b-1) Fees		none	1.00%
Other Expenses: Recoupment	[1]	0.05%	0.05%
Other Expenses: Other Operating Expenses		1.79%	1.79%
Total Annual Fund Operating Expenses		2.59%	3.59%
Fee Waivers/Reimbursements	[1]	(0.81%)	(0.81%)
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements		1.78%	2.78%

Example:

This 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 the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, except that the fee waiver/expense reimbursement is assumed only to pertain to the first year. Although your actual cost may be higher or lower, based on these assumptions your approximate costs would be:

Expense Example ACCESS FLEX BEAR HIGH YIELD FUND (USD $)	1 Year	3 Years	5 Years	10 Years
Investor Class	181	729	1,303	2,864
Service Class	281	1,025	1,791	3,801

The Fund pays transaction and financing costs associated with transacting in securities and derivatives. These costs are not reflected in the example or the table above.

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 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 Annual Fund Operating Expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s annual portfolio turnover rate was 0% of the average value of its entire portfolio. This portfolio turnover rate is calculated without regard to cash instrument or derivatives transactions. If such transactions were included, the Fund’s portfolio turnover rate would be significantly higher.

Principal Investment Strategies

The Fund invests primarily in derivatives and money market instruments that ProFund Advisors believes, in combination, should provide investment results that inversely correspond to the high yield market.

• Derivatives — The Fund invests in derivatives, which are financial instruments whose value is derived from the value of an underlying asset, interest rate or index. The Fund invests in derivatives as a substitute for directly shorting debt securities in order to gain inverse exposure to the high yield market. These derivatives principally include:

• Credit Default Swaps (“CDSs”) — Bilateral financial contracts that transfer credit exposure between two parties. CDSs may be used by the Fund to obtain credit risk exposure similar to that of a direct investment in high yield bonds. One party to a CDS (the “buyer”) receives credit protection or sheds credit risk, whereas the other party (the “seller”) to a CDS is selling credit protection or taking on credit risk. The seller typically receives one or more pre-determined periodic payments from the buyer. These payments are in consideration for guaranteeing to make a specific payment to the buyer should a negative credit event occur with respect to one of the issuers referenced in the CDS. The seller of an “unfunded” CDS would not make any payments to the buyer unless there is a negative credit event.

• Futures Contracts — A standardized contract traded on, or subject to the rules of, an exchange that calls for the future delivery of a specified quantity and type of asset at a specified time and place or, alternatively, may call for cash settlement.

• Money Market Instruments — The Fund invests in short-term cash instruments that have a remaining maturity of 397 days or less and exhibit high quality credit profiles , including:

• U.S. Treasury Bills — U.S. government securities that have initial maturities of one year or less, and are supported by the full faith and credit of the United States.

• Repurchase Agreements — Contracts in which a seller of securities, usually U.S. government securities or other money market instruments, agrees to buy them back at a specified time and price. Repurchase agreements are primarily used by the Fund as a short-term investment vehicle for cash positions.

The Fund seeks to maintain inverse exposure to the high yield market regardless of market conditions and without taking defensive positions in cash or other instruments in anticipation of periods favorable for the high yield market (which would generally be adverse market conditions for this Fund). As a result, the Fund may not achieve its investment objective during these periods. To find out if the Fund has sufficient assets to invest to attempt to meet its objective, you may call 1-888-776-3637. There is no assurance that the Fund will achieve its investment objective.

The Fund may invest up to 25% of its assets in foreign securities or financial instruments with respect to foreign securities.

Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the Fund’s full Prospectus for additional details.

Principal Risks

You could lose money by investing in the Fund.

Active Investor Risk — The Fund permits short-term trading of its securities. A significant portion of assets invested in the Fund come from professional money managers and investors who use the Fund as part of active trading or tactical asset allocation strategies. These strategies often call for frequent trading to take advantage of anticipated changes in market conditions, which could increase portfolio turnover and may result in additional costs for the Fund. In addition, large movements of assets into and out of the Fund may have a negative impact on the Fund’s ability to achieve its investment objective or maintain a consistent level of operating expenses. In certain circumstances, the Fund’s expense ratio may vary from current estimates or the historical ratio disclosed in this Prospectus.

Risks Associated with the Use of Derivatives — The Fund uses investment techniques, such as investing in derivatives, that may be considered aggressive. Investing in derivatives may expose the Fund to greater risks than investing directly in the reference asset(s) underlying those derivatives, such as counterparty risk and liquidity risk (each as discussed below). When the Fund uses derivatives, there may be imperfect correlation between the value of the reference asset(s) and the derivative, which may prevent the Fund from achieving its investment objective. Moreover, with respect to the use of swap agreements, if a reference asset has a dramatic intraday move that causes a material decline in the Fund’s net assets, the terms of a swap agreement between the Fund and its counterparty may permit the counterparty to immediately close out the transaction with the Fund. In that event, the Fund may be unable to enter into another swap agreement or invest in other derivatives to achieve the desired exposure consistent with the Fund’s investment objective. This, in turn, may prevent the Fund from achieving its investment objective, even if the reference asset reverses all or a portion of its intraday move by the end of the day.

Any financing, borrowing and other costs associated with using derivatives may also have the effect of lowering the Fund’s return.

CDS (Credit Default Swap) Risk – The Fund will normally be a net “buyer” of CDSs. When the Fund is a buyer of an unfunded CDS, upon the occurrence of a credit event, the counterparty to the Fund has an obligation to pay the full notional value of a defaulted reference obligation and take delivery from the Fund of such obligation either through physical settlement or cash settlement. Since CDSs may be physically settled, the Fund may first need to purchase the obligation in order to deliver it and obtain par value payment or an equivalent cash value. An active market may not exist for any of the CDSs in which the Fund invests or in the reference obligation subject to the CDSs. As a result, the Fund’s ability to maximize returns or minimize losses on such CDSs may be impaired. Other risks of CDSs include the difficulties in valuing a CDS depending on whether an active market exists for them or the lack of pricing transparency and the risk that the CDSs utilized by the Fund perform in a manner that does not inversely correlate to the high yield market or perform in other ways that are not expected. The Fund’s positions in CDSs are also subject to counterparty risk, market risk and interest rate risk. Because certain CDSs involve many reference issuers and there are no limitations on the notional amount established for CDSs, the Fund may use a single counterparty or a small number of counterparties, in which case, counterparty risk would be amplified. A CDS may involve greater risks than investing directly in the underlying reference obligations. For example, a CDS may increase the Fund’s credit risk because it has exposure to both the issuer of the underlying reference obligation and the counterparty to the CDS. Investing in CDSs may be considered an aggressive investment technique.

Counterparty Risk — The Fund will be subject to credit risk (i.e., the risk that a counterparty is unwilling or unable to make timely payments to meet its contractual obligations) with respect to the amount it expects to receive from counterparties to derivatives or repurchase agreements entered into by the Fund. If a counterparty becomes bankrupt or fails to perform its obligations, the value of your investment in the Fund may decline.

Exposure to Debt Instrument Risk — The Fund may invest in, or seek exposure to, debt instruments. Debt instruments may have varying levels of sensitivity to changes in interest rates, credit risk and other factors. Many types of debt instruments are subject to prepayment risk, which is the risk that the issuer of the security will repay principal prior to the maturity date. Debt instruments allowing prepayment may offer less potential for gains during a period of declining interest rates. In addition, changes in the credit quality of the issuer of a debt instrument can also affect the price of a debt instrument, as can an issuer’s default on its payment obligations. Such factors may cause the value of an investment in the Fund to change. Also, the securities of certain U.S. government agencies, authorities or instrumentalities are neither issued by nor guaranteed as to principal and interest by the U.S. government, and may be exposed to more credit risk than securities issued by and guaranteed as to principal and interest by the U.S. government. All U.S. government securities are subject to credit risk. It is possible that the U.S. government may not be able to meet its financial obligations or that securities issued by the U.S. government may experience credit downgrades. Such a credit event may also adversely impact the financial markets. While the realization of certain of these risks may benefit the Fund because the Fund seeks investments results that correspond to the inverse of the high yield market, such occurrences may introduce more volatility to the Fund.

High Yield Risk — Investment in or exposure to high yield (lower rated) debt instruments (also known as “junk bonds”) may involve greater levels of interest rate, credit, liquidity and valuation risk than for higher rated instruments. High yield debt instruments may be sensitive to economic changes, political changes, or adverse developments specific to a company. These securities are subject to greater risk of loss, greater sensitivity to interest rate and economic changes, valuation difficulties, and a potential lack of a secondary or public market for securities. High yield debt instruments are considered predominantly speculative with respect to the issuer’s continuing ability to make principal and interest payments and, therefore, such instruments generally involve greater risk of default or price changes than higher rated debt instruments. An economic downturn or period of rising interest rates could adversely affect the market for these securities and reduce market liquidity (liquidity risk). Less active markets may diminish the Fund’s ability to obtain accurate market quotations when valuing the portfolio securities and thereby give rise to valuation risk. High yield debt instruments may also present risks based on payment expectations. For example, these instruments may contain redemption or call provisions. If an issuer exercises these provisions in a declining interest rate market, the Fund would have to replace the security with a lower yielding security, resulting in a decreased return for investors. If the issuer of a security is in default with respect to interest or principal payments, the issuer’s security could lose its entire value. Furthermore, the transaction costs associated with the purchase and sale of high yield debt instruments may vary greatly depending upon a number of factors and may adversely affect the Fund’s performance. While the realization of certain of these risks may benefit the Fund because the Fund seeks investments results that correspond to the inverse of the high yield market, such occurrences may introduce more volatility to the Fund.

Early Close/Late Close/Trading Halt Risk — An exchange or market may close early, close late or issue trading halts on specific securities, or the ability to buy or sell certain securities or financial instruments may be restricted, which may result in the Fund being unable to buy or sell certain securities or financial instruments. In such circumstances, the Fund may be unable to rebalance its portfolio, may be unable to accurately price its investments and/or may incur substantial trading losses.

Interest Rate Risk — Interest rate risk is the risk that debt securities or certain financial instruments may fluctuate in value due to changes in interest rates. Commonly, investments subject to interest rate risk will decrease in value when interest rates rise and increase in value when interest rates decline. The opposite is true for the Fund. As a Fund seeking investment results that correspond to the inverse of the high yield market, the Fund’s performance will generally be more favorable when interest rates rise and less favorable when interest rates decline. The value of securities with longer maturities may fluctuate more in response to interest rate changes than securities with shorter maturities.

Inverse Correlation Risk — Shareholders should lose money when the high yield market gains value — a result that is the opposite from the results of investing in traditional high yield mutual funds.

Liquidity Risk — In certain circumstances, such as the disruption of the orderly markets for the securities or financial instruments in which the Fund invests, the Fund might not be able to acquire or dispose of certain holdings quickly or at prices that represent true market value in the judgment of ProFund Advisors. Markets for the securities or financial instruments in which the Fund invests may be disrupted by a number of events, including but not limited to economic crises, natural disasters, new legislation, or regulatory changes inside or outside of the U.S. For example, regulation limiting the ability of certain financial institutions to invest in certain securities would likely reduce the liquidity of those securities. Such situations may prevent the Fund from limiting losses, realizing gains or achieving a high inverse correlation with the total return of the high yield market.

Market Risk — The Fund is subject to market risks that will affect the value of its shares, including adverse issuer, political, regulatory, market or economic developments, as well as developments that impact specific economic sectors, industries or segments of the market. As a fund seeking investment results that correspond to the inverse of the high yield market, the Fund’s performance will generally decrease when market conditions cause improved performance in the high yield market.

Non-Diversification Risk — The Fund is classified as “non-diversified” under the Investment Company Act of 1940, and has the ability to invest a relatively high percentage of its assets in the securities of a small number of issuers susceptible to a single economic, political or regulatory event, or in financial instruments with a single counterparty if ProFund Advisors determines that doing so is the most efficient means of meeting the Fund’s investment objective. This makes the performance of the Fund more susceptible to adverse impact to an issuer or counterparty than a diversified fund might be.

Portfolio Turnover Risk — The Fund’s strategy typically involves high portfolio turnover to manage the Fund’s investment exposure. Additionally, active trading of the Fund’s shares may cause more frequent purchase and sales activities that could, in certain circumstances, increase the number of portfolio transactions. High levels of transactions increase brokerage costs and may result in increased taxable capital gains.

Short Sale Exposure Risk — The Fund may seek inverse exposure through financial instruments, which may cause the Fund to be exposed to certain risks associated with selling securities short. These risks include, under certain market conditions, an increase in the volatility and decrease in the liquidity of securities underlying the short position, which may adversely impact the Fund’s return, result in a loss, have the effect of limiting the Fund’s ability to obtain inverse exposure through financial instruments such as swap agreements, or require the Fund to seek inverse exposure through alternative investment strategies that may be less desirable or may be costly to implement. To the extent that, at any particular point in time, the securities underlying the short position may be thinly traded or have a limited market, including due to regulatory action, the Fund may be unable to meet its investment objective (e.g., due to a lack of available securities or counterparties). During such periods, the Fund’s ability to issue additional shares may be adversely affected. Obtaining inverse exposure through these instruments may be considered an aggressive investment technique.

Valuation Risk — In certain circumstances, portfolio securities may be valued using techniques other than market quotations. The value established for a portfolio security may be different from what would be produced through the use of another methodology or if it had been priced using market quotations. Portfolio securities that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their value from one day to the next than would be the case if market quotations were used. In addition, there is no assurance that the Fund could sell a portfolio security for the value established for it at any time, and it is possible that the Fund would incur a loss because a portfolio security is sold at a discount to its established value.

Valuation Time Risk — The Fund typically values its portfolio at 4:00 p.m. (Eastern time). In certain cases, the bond markets close before such time or may not be open for business on the same calendar days as the Fund. As a result, the daily performance of the Fund may vary, perhaps significantly, from the performance of the high yield market.

Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the Fund’s full Prospectus for additional details.

Investment Results

The bar chart below shows how the Fund’s investment results for Investor Class shares have varied from year to year, and the table shows how the Fund’s average annual total returns for various periods compare with a broad measure of market performance. This information provides some indication of the risks of investing in the Fund. Past results (before and after taxes) are not predictive of future results. Updated information on the Fund’s results can be obtained by visiting ProFunds.com.

Annual Returns of Investor Class Shares as of December 31 each year

Best Quarter (ended 3/31/2009): 13.14%;

Worst Quarter (ended 9/30/2009): -12.18%.

Average Annual Total Returns
As of December 31, 2012

Average Annual Total Returns ACCESS FLEX BEAR HIGH YIELD FUND		One Year	Five Years	Since Inception	Inception Date
Investor Class Shares		(17.60%)	(13.92%)	(10.37%)	Apr. 27, 2005
Investor Class Shares After Taxes on Distribution		(17.60%)	(13.92%)	(10.53%)	Apr. 27, 2005
Investor Class Shares After Taxes on Distribution and Sale of Shares		(11.44%)	(11.22%)	(8.28%)	Apr. 27, 2005
Service Class Shares		(18.45%)	(14.82%)	(11.31%)	Apr. 27, 2005
JPMorgan Domestic High Yield Index	[1]	15.39%	10.46%	9.19%

Average annual total returns are shown on a before- and after-tax basis for Investor Class shares only. After-tax returns for Service Class shares will vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold the Fund’s shares through tax-deferred arrangements, such as a retirement account. After-tax returns may exceed the return before taxes due to a tax benefit from realizing a capital loss on a sale of shares.

[1] ProFund Advisors LLC ("ProFund Advisors" or the "Advisor") has contractually agreed to waive Investment Advisory and Management Services Fees and to reimburse Other Expenses to the extent Total Annual Fund Operating Expenses Before Fee Waivers and Expense Reimbursements, as a percentage of average daily net assets, exceed 1.78% for Investor Class shares and 2.78% for Service Class shares through February 28, 2014. After such date, the expense limitation may be terminated or revised by the Advisor. Amounts waived or reimbursed in a particular contractual period may be recouped by ProFund Advisors within three years of the end of the contractual period to the extent that recoupment will not cause the Fund's expenses to exceed any expense limitation in place at that time.

[1] Reflects no deduction for fees, expenses or taxes. Adjusted to reflect the reinvestment of dividends paid by companies in the Index. Since inception returns are calculated from the date the Fund commenced operations, not the date of inception of the Index.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Access One Trust
Prospectus Date	rr_ProspectusDate	Feb. 28, 2013
ACCESS FLEX HIGH YIELD FUND
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Access Flex High Yield Fund        TICKERS :: Investor Class FYAIX :: Service Class FYASX Important Information About the Fund If Access Flex High Yield Fund (the “Fund”) is successful in meeting its objective, its net asset value should generally gain value as the high yield market (i.e., U.S. corporate high yield debt market) is rallying (gaining value). Conversely, its net asset value should generally decrease in value as the high yield market is falling (losing value). These results are generally similar to those of most traditional high yield mutual funds.
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to provide investment results that correspond generally to the total return of the high yield market consistent with maintaining reasonable liquidity.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The table below describes the fees and expenses that you may pay if you buy or hold shares of the Fund.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	February 28, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover 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 Annual Fund Operating Expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s annual portfolio turnover rate was 1,539% of the average value of its entire portfolio. This portfolio turnover rate is calculated without regard to cash instrument or derivatives transactions. If such transactions were included, the Fund’s portfolio turnover rate would be significantly higher.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	1539.00%
Expense Example [Heading]	rr_ExpenseExampleHeading	Example:
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This 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 the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, except that the fee waiver/expense reimbursement is assumed only to pertain to the first year. Although your actual cost may be higher or lower, based on these assumptions your approximate costs would be:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	The Fund pays transaction and financing costs associated with transacting in securities and derivatives. These costs are not reflected in the example or the table above.
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund invests primarily in derivatives, money market instruments and U.S. Treasury obligations that ProFund Advisors believes, in combination, should provide investment results that correspond to the high yield market. The Fund also may invest in high yield debt securities. Derivatives — The Fund invests in derivatives, which are financial instruments whose value is derived from the value of an underlying asset, interest rate or index. The Fund invests in derivatives as a substitute for investing directly in debt securities in order to gain exposure to the high yield market. These derivatives principally include: Credit Default Swaps (“CDSs”) — Bilateral financial contracts that transfer credit exposure between two parties. CDSs may be used by the Fund to obtain credit risk exposure similar to that of a direct investment in high yield bonds. One party to a CDS (the “buyer”) receives credit protection or sheds credit risk, whereas the other party (the “seller”) to a CDS is selling credit protection or taking on credit risk. The seller typically receives one or more pre-determined periodic payments from the buyer. These payments are in consideration for guaranteeing to make a specific payment to the buyer should a negative credit event occur with respect to one of the issuers referenced in the CDS. The seller of an “unfunded” CDS would not make any payments to the buyer unless there is a negative credit event. Futures Contracts — A standardized contract traded on, or subject to the rules of, an exchange that calls for the future delivery of a specified quantity and type of asset at a specified time and place or, alternatively, may call for cash settlement. Money Market Instruments — The Fund invests in short-term cash instruments that have a remaining maturity of 397 days or less and exhibit high quality credit profiles, including: U.S. Treasury Bills — U.S. government securities that have initial maturities of one year or less, and are supported by the full faith and credit of the United States. Repurchase Agreements — Contracts in which a seller of securities, usually U.S. government securities or other money market instruments, agrees to buy them back at a specified time and price. Repurchase agreements are primarily used by the Fund as a short-term investment vehicle for cash positions. U.S. Treasury Obligations — The Fund invests in obligations of the U.S. Department of the Treasury (“U.S. Treasury”), including Treasury bills, bonds and notes and other obligations issued or guaranteed by the U.S. Treasury, and repurchase agreements fully collateralized by U.S. Treasury securities. Theses debt securities carry different interest rates, maturities and issue dates. The Fund seeks to maintain exposure to the high yield market regardless of market conditions and without taking defensive positions in cash or other instruments in anticipation of an adverse climate for the high yield market. To find out if the Fund has sufficient assets to invest to attempt to meet its objective, you may call 1-888-776-3637. There is no assurance that the Fund will achieve its investment objective. The Fund may invest up to 25% of its assets in foreign securities or financial instruments with respect to foreign securities. Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the Fund’s full Prospectus for additional details.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You could lose money by investing in the Fund. Active Investor Risk — The Fund permits short-term trading of its securities. A significant portion of assets invested in the Fund come from professional money managers and investors who use the Fund as part of active trading or tactical asset allocation strategies. These strategies often call for frequent trading to take advantage of anticipated changes in market conditions, which could increase portfolio turnover and may result in additional costs for the Fund. In addition, large movements of assets into and out of the Fund may have a negative impact on the Fund’s ability to achieve its investment objective or maintain a consistent level of operating expenses. In certain circumstances, the Fund’s expense ratio may vary from current estimates or the historical ratio disclosed in this Prospectus. Risks Associated with the Use of Derivatives — The Fund uses investment techniques, such as investing in derivatives, that may be considered aggressive. Investing in derivatives may expose the Fund to greater risks than investing directly in the reference asset(s) underlying those derivatives, such as counterparty risk and liquidity risk (each as discussed below). When the Fund uses derivatives, there may be imperfect correlation between the value of the reference asset(s) and the derivative, which may prevent the Fund from achieving its investment objective. Moreover, with respect to the use of swap agreements, if a reference asset has a dramatic intraday move that causes a material decline in the Fund’s net assets, the terms of a swap agreement between the Fund and its counterparty may permit the counterparty to immediately close out the transaction with the Fund. In that event, the Fund may be unable to enter into another swap agreement or invest in other derivatives to achieve the desired exposure consistent with the Fund’s investment objective. This, in turn, may prevent the Fund from achieving its investment objective, even if the reference asset reverses all or a portion of its intraday move by the end of the day. Any financing, borrowing and other costs associated with using derivatives may also have the effect of lowering the Fund’s return. CDS (Credit Default Swap) Risk — The Fund will normally be a net “seller” of CDSs. When the Fund is a seller of an unfunded CDS, upon the occurrence of a credit event, the Fund has an obligation to pay the full notional value of a defaulted reference obligation and take delivery from the counterparty of such obligation either through physical settlement or cash settlement. Since CDSs may be physically settled, the counterparty may first need to purchase the obligation in order to deliver it and obtain par value payment or an equivalent cash value. An active market may not exist for any of the CDSs in which the Fund invests or in the reference obligation subject to the CDSs. As a result, the Fund’s ability to maximize returns or minimize losses on such CDSs may be impaired. Other risks of CDSs include the difficulties in valuing a CDS depending on whether an active market exists for them or the lack of pricing transparency and the risk that the CDSs utilized by the Fund perform in a manner that does not correlate to the high yield market or perform in other ways that are not expected. The Fund’s positions in CDSs are also subject to counterparty risk, market risk and interest rate risk. Because certain CDSs involve many reference issuers and there are no limitations on the notional amount established for CDSs, the Fund may use a single counterparty or a small number of counterparties, in which case, counterparty risk would be amplified. A CDS may involve greater risks than investing directly in the underlying reference obligations. For example, a CDS may increase the Fund’s credit risk because it has exposure to both the issuer of the underlying reference obligation and the counterparty to the CDS. Investing in CDSs may be considered an aggressive investment technique. Counterparty Risk — The Fund will be subject to credit risk (i.e., the risk that a counterparty is unwilling or unable to make timely payments to meet its contractual obligations) with respect to the amount it expects to receive from counterparties to derivatives or repurchase agreements entered into by the Fund. If a counterparty becomes bankrupt or fails to perform its obligations, the value of your investment in the Fund may decline. Exposure to Debt Instrument Risk — The Fund may invest in, or seek exposure to, debt instruments. Debt instruments may have varying levels of sensitivity to changes in interest rates, credit risk and other factors. Many types of debt instruments are subject to prepayment risk, which is the risk that the issuer of the security will repay principal prior to the maturity date. Debt instruments allowing prepayment may offer less potential for gains during a period of declining interest rates. In addition, changes in the credit quality of the issuer of a debt instrument can also affect the price of a debt instrument, as can an issuer’s default on its payment obligations. Such factors may cause the value of an investment in the Fund to change. Also, the securities of certain U.S. government agencies, authorities or instrumentalities are neither issued by nor guaranteed as to principal and interest by the U.S. government, and may be exposed to more credit risk than securities issued by and guaranteed as to principal and interest by the U.S. government. All U.S. government securities are subject to credit risk. It is possible that the U.S. government may not be able to meet its financial obligations or that securities issued by the U.S. government may experience credit downgrades. Such a credit event may also adversely impact the financial markets. High Yield Risk — Investment in or exposure to high yield (lower rated) debt instruments (also known as “junk bonds”) may involve greater levels of interest rate, credit, liquidity and valuation risk than for higher rated instruments. High yield debt instruments may be sensitive to economic changes, political changes, or adverse developments specific to a company. These securities are subject to greater risk of loss, greater sensitivity to interest rate and economic changes, valuation difficulties, and a potential lack of a secondary or public market for securities. High yield debt instruments are considered predominantly speculative with respect to the issuer’s continuing ability to make principal and interest payments and, therefore, such instruments generally involve greater risk of default or price changes than higher rated debt instruments. An economic downturn or period of rising interest rates could adversely affect the market for these securities and reduce market liquidity (liquidity risk). Less active markets may diminish the Fund’s ability to obtain accurate market quotations when valuing the portfolio securities and thereby give rise to valuation risk. High yield debt instruments may also present risks based on payment expectations. For example, these instruments may contain redemption or call provisions. If an issuer exercises these provisions in a declining interest rate market, the Fund would have to replace the security with a lower yielding security, resulting in a decreased return for investors. If the issuer of a security is in default with respect to interest or principal payments, the issuer’s security could lose its entire value. Furthermore, the transaction costs associated with the purchase and sale of high yield debt instruments may vary greatly depending upon a number of factors and may adversely affect the Fund’s performance. Early Close/Late Close/Trading Halt Risk — An exchange or market may close early, close late or issue trading halts on specific securities, or the ability to buy or sell certain securities or financial instruments may be restricted, which may result in the Fund being unable to buy or sell certain securities or financial instruments. In such circumstances, the Fund may be unable to rebalance its portfolio, may be unable to accurately price its investments and/or may incur substantial trading losses. Interest Rate Risk — Interest rate risk is the risk that debt securities or certain financial instruments may fluctuate in value due to changes in interest rates. Commonly, investments subject to interest rate risk will decrease in value when interest rates rise and increase in value when interest rates decline. The value of securities with longer maturities may fluctuate more in response to interest rate changes than securities with shorter maturities. Liquidity Risk — In certain circumstances, such as the disruption of the orderly markets for the securities or financial instruments in which the Fund invests, the Fund might not be able to acquire or dispose of certain holdings quickly or at prices that represent true market value in the judgment of ProFund Advisors. Markets for the securities or financial instruments in which the Fund invests may be disrupted by a number of events, including but not limited to economic crises, natural disasters, new legislation, or regulatory changes inside or outside of the U.S. For example, regulation limiting the ability of certain financial institutions to invest in certain securities would likely reduce the liquidity of those securities. Such situations may prevent the Fund from limiting losses, realizing gains, or achieving a high correlation with the total return of the high yield market. Market Risk — The Fund is subject to market risks that will affect the value of its shares, including adverse issuer, political, regulatory, market or economic developments, as well as developments that impact specific economic sectors, industries or segments of the market. Non-Diversification Risk — The Fund is classified as “non-diversified” under the Investment Company Act of 1940, and has the ability to invest a relatively high percentage of its assets in the securities of a small number of issuers susceptible to a single economic, political or regulatory event, or in financial instruments with a single counterparty if ProFund Advisors determines that doing so is the most efficient means of meeting the Fund’s investment objective. This makes the performance of the Fund more susceptible to adverse impact to an issuer or counterparty than a diversified fund might be. Portfolio Turnover Risk — The Fund’s strategy typically involves high portfolio turnover to manage the Fund’s investment exposure. Additionally, active trading of the Fund’s shares may cause more frequent purchase and sales activities that could, in certain circumstances, increase the number of portfolio transactions. High levels of transactions increase brokerage costs and may result in increased taxable capital gains. Valuation Risk — In certain circumstances, portfolio securities may be valued using techniques other than market quotations. The value established for a portfolio security may be different from what would be produced through the use of another methodology or if it had been priced using market quotations. Portfolio securities that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their value from one day to the next than would be the case if market quotations were used. In addition, there is no assurance that the Fund could sell a portfolio security for the value established for it at any time, and it is possible that the Fund would incur a loss because a portfolio security is sold at a discount to its established value. Valuation Time Risk — The Fund typically values its portfolio at 4:00 p.m. (Eastern time). In certain cases, the bond markets close before such time or may not be open for business on the same calendar days as the Fund. As a result, the daily performance of the Fund may vary, perhaps significantly, from the performance of the high yield market. Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the Fund’s full Prospectus for additional details.
Risk Lose Money [Text]	rr_RiskLoseMoney	You could lose money by investing in the Fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Non-Diversification Risk — The Fund is classified as “non-diversified” under the Investment Company Act of 1940, and has the ability to invest a relatively high percentage of its assets in the securities of a small number of issuers susceptible to a single economic, political or regulatory event, or in financial instruments with a single counterparty if ProFund Advisors determines that doing so is the most efficient means of meeting the Fund’s investment objective. This makes the performance of the Fund more susceptible to adverse impact to an issuer or counterparty than a diversified fund might be.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Investment Results
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart below shows how the Fund’s investment results for Investor Class shares have varied from year to year, and the table shows how the Fund’s average annual total returns for various periods compare with a broad measure of market performance. This information provides some indication of the risks of investing in the Fund. Past results (before and after taxes) are not predictive of future results. Updated information on the Fund’s results can be obtained by visiting ProFunds.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart below shows how the Fund’s investment results for Investor Class shares have varied from year to year, and the table shows how the Fund’s average annual total returns for various periods compare with a broad measure of market performance.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	ProFunds.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Past results (before and after taxes) are not predictive of future results.
Bar Chart [Heading]	rr_BarChartHeading	Annual Returns of Investor Class Shares as of December 31 each year
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter (ended 6/30/2009): 13.71%; Worst Quarter (ended 3/31/2009): -15.59%.
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns As of December 31, 2012
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Reflects no deduction for fees, expenses or taxes.
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold the Fund’s shares through tax-deferred arrangements, such as a retirement account.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	Average annual total returns are shown on a before- and after-tax basis for Investor Class shares only. After-tax returns for Service Class shares will vary.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	After-tax returns may exceed the return before taxes due to a tax benefit from realizing a capital loss on a sale of shares.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	Average annual total returns are shown on a before- and after-tax basis for Investor Class shares only. After-tax returns for Service Class shares will vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold the Fund’s shares through tax-deferred arrangements, such as a retirement account. After-tax returns may exceed the return before taxes due to a tax benefit from realizing a capital loss on a sale of shares.
ACCESS FLEX HIGH YIELD FUND | Investor Class
Risk/Return:	rr_RiskReturnAbstract
Wire Fee	rr_ShareholderFeeOther	10
Investment Advisory Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	1.02%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.77%	[1]
1 Year	rr_ExpenseExampleYear01	180
3 Years	rr_ExpenseExampleYear03	557
5 Years	rr_ExpenseExampleYear05	959
10 Years	rr_ExpenseExampleYear10	2,084
2005	rr_AnnualReturn2005	3.92%
2006	rr_AnnualReturn2006	9.31%
2008	rr_AnnualReturn2007	4.82%
2008	rr_AnnualReturn2008	(5.13%)
2009	rr_AnnualReturn2009	15.84%
2010	rr_AnnualReturn2010	14.76%
2011	rr_AnnualReturn2011	1.75%
2012	rr_AnnualReturn2012	12.74%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	13.71%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2009
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(15.59%)
One Year	rr_AverageAnnualReturnYear01	12.74%
Five Years	rr_AverageAnnualReturnYear05	7.67%
Since Inception	rr_AverageAnnualReturnSinceInception	6.98%
Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 17, 2004
ACCESS FLEX HIGH YIELD FUND | Service Class
Risk/Return:	rr_RiskReturnAbstract
Wire Fee	rr_ShareholderFeeOther	10
Investment Advisory Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses	rr_OtherExpensesOverAssets	1.02%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.77%	[1]
1 Year	rr_ExpenseExampleYear01	280
3 Years	rr_ExpenseExampleYear03	859
5 Years	rr_ExpenseExampleYear05	1,464
10 Years	rr_ExpenseExampleYear10	3,099
One Year	rr_AverageAnnualReturnYear01	11.63%
Five Years	rr_AverageAnnualReturnYear05	6.63%
Since Inception	rr_AverageAnnualReturnSinceInception	5.99%
Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 17, 2004
ACCESS FLEX HIGH YIELD FUND | After Taxes on Distribution | Investor Class
Risk/Return:	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	12.74%
Five Years	rr_AverageAnnualReturnYear05	5.77%
Since Inception	rr_AverageAnnualReturnSinceInception	4.82%
Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 17, 2004
ACCESS FLEX HIGH YIELD FUND | After Taxes on Distribution and Sale of Shares | Investor Class
Risk/Return:	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	8.28%
Five Years	rr_AverageAnnualReturnYear05	5.38%
Since Inception	rr_AverageAnnualReturnSinceInception	4.63%
Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 17, 2004
ACCESS FLEX HIGH YIELD FUND | JPMorgan Domestic High Yield Index
Risk/Return:	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	15.39%	[2]
Five Years	rr_AverageAnnualReturnYear05	10.46%	[2]
Since Inception	rr_AverageAnnualReturnSinceInception	8.56%	[2]

[1] ProFund Advisors LLC ("ProFund Advisors" or the "Advisor") has contractually agreed to waive Investment Advisory and Management Services Fees and to reimburse Other Expenses to the extent Total Annual Fund Operating Expenses, as a percentage of average daily net assets, exceed 1.95% for Investor Class shares and 2.95% for Service Class shares through February 28, 2014. After such date, the expense limitation may be terminated or revised by the Advisor. Amounts waived or reimbursed in a particular contractual period may be recouped by ProFund Advisors within three years of the end of the contractual period to the extent that recoupment will not cause the Fund's expenses to exceed any expense limitation in place at that time.

[2] Reflects no deduction for fees, expenses or taxes. Adjusted to reflect the reinvestment of dividends paid by companies in the Index. Since inception returns are calculated from the date the Fund commenced operations, not the date of inception of the Index.

XML

ACCESS FLEX HIGH YIELD FUND

Access Flex High Yield Fund        TICKERS :: Investor Class FYAIX :: Service Class FYASX

Important Information About the Fund
If Access Flex High Yield Fund (the “Fund”) is successful in meeting its objective, its net asset value should generally gain value as the high yield market (i.e., U.S. corporate high yield debt market) is rallying (gaining value). Conversely, its net asset value should generally decrease in value as the high yield market is falling (losing value). These results are generally similar to those of most traditional high yield mutual funds.

Investment Objective

The Fund seeks to provide investment results that correspond generally to the total return of the high yield market consistent with maintaining reasonable liquidity.

Fees and Expenses of the Fund

The table below describes the fees and expenses that you may pay if you buy or hold shares of the Fund.

Shareholder Fees
(fees paid directly from your investment)

Shareholder Fees ACCESS FLEX HIGH YIELD FUND (USD $)	Investor Class	Service Class
Wire Fee	10	10

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

Annual Fund Operating Expenses ACCESS FLEX HIGH YIELD FUND		Investor Class	Service Class
Investment Advisory Fees		0.75%	0.75%
Distribution and Service (12b-1) Fees		none	1.00%
Other Expenses		1.02%	1.02%
Total Annual Fund Operating Expenses	[1]	1.77%	2.77%

Example:

This 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 the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, except that the fee waiver/expense reimbursement is assumed only to pertain to the first year. Although your actual cost may be higher or lower, based on these assumptions your approximate costs would be:

Expense Example ACCESS FLEX HIGH YIELD FUND (USD $)	1 Year	3 Years	5 Years	10 Years
Investor Class	180	557	959	2,084
Service Class	280	859	1,464	3,099

The Fund pays transaction and financing costs associated with transacting in securities and derivatives. These costs are not reflected in the example or the table above.

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 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 Annual Fund Operating Expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s annual portfolio turnover rate was 1,539% of the average value of its entire portfolio. This portfolio turnover rate is calculated without regard to cash instrument or derivatives transactions. If such transactions were included, the Fund’s portfolio turnover rate would be significantly higher.

Principal Investment Strategies

The Fund invests primarily in derivatives, money market instruments and U.S. Treasury obligations that ProFund Advisors believes, in combination, should provide investment results that correspond to the high yield market. The Fund also may invest in high yield debt securities.

• Derivatives — The Fund invests in derivatives, which are financial instruments whose value is derived from the value of an underlying asset, interest rate or index. The Fund invests in derivatives as a substitute for investing directly in debt securities in order to gain exposure to the high yield market. These derivatives principally include:

• Credit Default Swaps (“CDSs”) — Bilateral financial contracts that transfer credit exposure between two parties. CDSs may be used by the Fund to obtain credit risk exposure similar to that of a direct investment in high yield bonds. One party to a CDS (the “buyer”) receives credit protection or sheds credit risk, whereas the other party (the “seller”) to a CDS is selling credit protection or taking on credit risk. The seller typically receives one or more pre-determined periodic payments from the buyer. These payments are in consideration for guaranteeing to make a specific payment to the buyer should a negative credit event occur with respect to one of the issuers referenced in the CDS. The seller of an “unfunded” CDS would not make any payments to the buyer unless there is a negative credit event.

• Futures Contracts — A standardized contract traded on, or subject to the rules of, an exchange that calls for the future delivery of a specified quantity and type of asset at a specified time and place or, alternatively, may call for cash settlement.

• Money Market Instruments — The Fund invests in short-term cash instruments that have a remaining maturity of 397 days or less and exhibit high quality credit profiles, including:

• U.S. Treasury Bills — U.S. government securities that have initial maturities of one year or less, and are supported by the full faith and credit of the United States.

• Repurchase Agreements — Contracts in which a seller of securities, usually U.S. government securities or other money market instruments, agrees to buy them back at a specified time and price. Repurchase agreements are primarily used by the Fund as a short-term investment vehicle for cash positions.

• U.S. Treasury Obligations — The Fund invests in obligations of the U.S. Department of the Treasury (“U.S. Treasury”), including Treasury bills, bonds and notes and other obligations issued or guaranteed by the U.S. Treasury, and repurchase agreements fully collateralized by U.S. Treasury securities. Theses debt securities carry different interest rates, maturities and issue dates.

The Fund seeks to maintain exposure to the high yield market regardless of market conditions and without taking defensive positions in cash or other instruments in anticipation of an adverse climate for the high yield market. To find out if the Fund has sufficient assets to invest to attempt to meet its objective, you may call 1-888-776-3637. There is no assurance that the Fund will achieve its investment objective. The Fund may invest up to 25% of its assets in foreign securities or financial instruments with respect to foreign securities.

Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the Fund’s full Prospectus for additional details.

Principal Risks

You could lose money by investing in the Fund.

Active Investor Risk — The Fund permits short-term trading of its securities. A significant portion of assets invested in the Fund come from professional money managers and investors who use the Fund as part of active trading or tactical asset allocation strategies. These strategies often call for frequent trading to take advantage of anticipated changes in market conditions, which could increase portfolio turnover and may result in additional costs for the Fund. In addition, large movements of assets into and out of the Fund may have a negative impact on the Fund’s ability to achieve its investment objective or maintain a consistent level of operating expenses. In certain circumstances, the Fund’s expense ratio may vary from current estimates or the historical ratio disclosed in this Prospectus.

Risks Associated with the Use of Derivatives — The Fund uses investment techniques, such as investing in derivatives, that may be considered aggressive. Investing in derivatives may expose the Fund to greater risks than investing directly in the reference asset(s) underlying those derivatives, such as counterparty risk and liquidity risk (each as discussed below). When the Fund uses derivatives, there may be imperfect correlation between the value of the reference asset(s) and the derivative, which may prevent the Fund from achieving its investment objective. Moreover, with respect to the use of swap agreements, if a reference asset has a dramatic intraday move that causes a material decline in the Fund’s net assets, the terms of a swap agreement between the Fund and its counterparty may permit the counterparty to immediately close out the transaction with the Fund. In that event, the Fund may be unable to enter into another swap agreement or invest in other derivatives to achieve the desired exposure consistent with the Fund’s investment objective. This, in turn, may prevent the Fund from achieving its investment objective, even if the reference asset reverses all or a portion of its intraday move by the end of the day. Any financing, borrowing and other costs associated with using derivatives may also have the effect of lowering the Fund’s return.

CDS (Credit Default Swap) Risk — The Fund will normally be a net “seller” of CDSs. When the Fund is a seller of an unfunded CDS, upon the occurrence of a credit event, the Fund has an obligation to pay the full notional value of a defaulted reference obligation and take delivery from the counterparty of such obligation either through physical settlement or cash settlement. Since CDSs may be physically settled, the counterparty may first need to purchase the obligation in order to deliver it and obtain par value payment or an equivalent cash value. An active market may not exist for any of the CDSs in which the Fund invests or in the reference obligation subject to the CDSs. As a result, the Fund’s ability to maximize returns or minimize losses on such CDSs may be impaired. Other risks of CDSs include the difficulties in valuing a CDS depending on whether an active market exists for them or the lack of pricing transparency and the risk that the CDSs utilized by the Fund perform in a manner that does not correlate to the high yield market or perform in other ways that are not expected. The Fund’s positions in CDSs are also subject to counterparty risk, market risk and interest rate risk. Because certain CDSs involve many reference issuers and there are no limitations on the notional amount established for CDSs, the Fund may use a single counterparty or a small number of counterparties, in which case, counterparty risk would be amplified. A CDS may involve greater risks than investing directly in the underlying reference obligations. For example, a CDS may increase the Fund’s credit risk because it has exposure to both the issuer of the underlying reference obligation and the counterparty to the CDS. Investing in CDSs may be considered an aggressive investment technique.

Counterparty Risk — The Fund will be subject to credit risk (i.e., the risk that a counterparty is unwilling or unable to make timely payments to meet its contractual obligations) with respect to the amount it expects to receive from counterparties to derivatives or repurchase agreements entered into by the Fund. If a counterparty becomes bankrupt or fails to perform its obligations, the value of your investment in the Fund may decline.

Exposure to Debt Instrument Risk — The Fund may invest in, or seek exposure to, debt instruments. Debt instruments may have varying levels of sensitivity to changes in interest rates, credit risk and other factors. Many types of debt instruments are subject to prepayment risk, which is the risk that the issuer of the security will repay principal prior to the maturity date. Debt instruments allowing prepayment may offer less potential for gains during a period of declining interest rates. In addition, changes in the credit quality of the issuer of a debt instrument can also affect the price of a debt instrument, as can an issuer’s default on its payment obligations. Such factors may cause the value of an investment in the Fund to change. Also, the securities of certain U.S. government agencies, authorities or instrumentalities are neither issued by nor guaranteed as to principal and interest by the U.S. government, and may be exposed to more credit risk than securities issued by and guaranteed as to principal and interest by the U.S. government. All U.S. government securities are subject to credit risk. It is possible that the U.S. government may not be able to meet its financial obligations or that securities issued by the U.S. government may experience credit downgrades. Such a credit event may also adversely impact the financial markets.

High Yield Risk — Investment in or exposure to high yield (lower rated) debt instruments (also known as “junk bonds”) may involve greater levels of interest rate, credit, liquidity and valuation risk than for higher rated instruments. High yield debt instruments may be sensitive to economic changes, political changes, or adverse developments specific to a company. These securities are subject to greater risk of loss, greater sensitivity to interest rate and economic changes, valuation difficulties, and a potential lack of a secondary or public market for securities. High yield debt instruments are considered predominantly speculative with respect to the issuer’s continuing ability to make principal and interest payments and, therefore, such instruments generally involve greater risk of default or price changes than higher rated debt instruments. An economic downturn or period of rising interest rates could adversely affect the market for these securities and reduce market liquidity (liquidity risk). Less active markets may diminish the Fund’s ability to obtain accurate market quotations when valuing the portfolio securities and thereby give rise to valuation risk. High yield debt instruments may also present risks based on payment expectations. For example, these instruments may contain redemption or call provisions. If an issuer exercises these provisions in a declining interest rate market, the Fund would have to replace the security with a lower yielding security, resulting in a decreased return for investors. If the issuer of a security is in default with respect to interest or principal payments, the issuer’s security could lose its entire value. Furthermore, the transaction costs associated with the purchase and sale of high yield debt instruments may vary greatly depending upon a number of factors and may adversely affect the Fund’s performance.

Early Close/Late Close/Trading Halt Risk — An exchange or market may close early, close late or issue trading halts on specific securities, or the ability to buy or sell certain securities or financial instruments may be restricted, which may result in the Fund being unable to buy or sell certain securities or financial instruments. In such circumstances, the Fund may be unable to rebalance its portfolio, may be unable to accurately price its investments and/or may incur substantial trading losses.

Interest Rate Risk — Interest rate risk is the risk that debt securities or certain financial instruments may fluctuate in value due to changes in interest rates. Commonly, investments subject to interest rate risk will decrease in value when interest rates rise and increase in value when interest rates decline. The value of securities with longer maturities may fluctuate more in response to interest rate changes than securities with shorter maturities.

Liquidity Risk — In certain circumstances, such as the disruption of the orderly markets for the securities or financial instruments in which the Fund invests, the Fund might not be able to acquire or dispose of certain holdings quickly or at prices that represent true market value in the judgment of ProFund Advisors. Markets for the securities or financial instruments in which the Fund invests may be disrupted by a number of events, including but not limited to economic crises, natural disasters, new legislation, or regulatory changes inside or outside of the U.S. For example, regulation limiting the ability of certain financial institutions to invest in certain securities would likely reduce the liquidity of those securities. Such situations may prevent the Fund from limiting losses, realizing gains, or achieving a high correlation with the total return of the high yield market.

Market Risk — The Fund is subject to market risks that will affect the value of its shares, including adverse issuer, political, regulatory, market or economic developments, as well as developments that impact specific economic sectors, industries or segments of the market.

Non-Diversification Risk — The Fund is classified as “non-diversified” under the Investment Company Act of 1940, and has the ability to invest a relatively high percentage of its assets in the securities of a small number of issuers susceptible to a single economic, political or regulatory event, or in financial instruments with a single counterparty if ProFund Advisors determines that doing so is the most efficient means of meeting the Fund’s investment objective. This makes the performance of the Fund more susceptible to adverse impact to an issuer or counterparty than a diversified fund might be.

Portfolio Turnover Risk — The Fund’s strategy typically involves high portfolio turnover to manage the Fund’s investment exposure. Additionally, active trading of the Fund’s shares may cause more frequent purchase and sales activities that could, in certain circumstances, increase the number of portfolio transactions. High levels of transactions increase brokerage costs and may result in increased taxable capital gains.

Valuation Risk — In certain circumstances, portfolio securities may be valued using techniques other than market quotations. The value established for a portfolio security may be different from what would be produced through the use of another methodology or if it had been priced using market quotations. Portfolio securities that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their value from one day to the next than would be the case if market quotations were used. In addition, there is no assurance that the Fund could sell a portfolio security for the value established for it at any time, and it is possible that the Fund would incur a loss because a portfolio security is sold at a discount to its established value.

Valuation Time Risk — The Fund typically values its portfolio at 4:00 p.m. (Eastern time). In certain cases, the bond markets close before such time or may not be open for business on the same calendar days as the Fund. As a result, the daily performance of the Fund may vary, perhaps significantly, from the performance of the high yield market.

Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the Fund’s full Prospectus for additional details.

Investment Results

The bar chart below shows how the Fund’s investment results for Investor Class shares have varied from year to year, and the table shows how the Fund’s average annual total returns for various periods compare with a broad measure of market performance. This information provides some indication of the risks of investing in the Fund. Past results (before and after taxes) are not predictive of future results. Updated information on the Fund’s results can be obtained by visiting ProFunds.com.

Annual Returns of Investor Class Shares as of December 31 each year

Best Quarter (ended 6/30/2009): 13.71%;

Worst Quarter (ended 3/31/2009): -15.59%.

Average Annual Total Returns
As of December 31, 2012

Average Annual Total Returns ACCESS FLEX HIGH YIELD FUND		One Year	Five Years	Since Inception	Inception Date
Investor Class Shares		12.74%	7.67%	6.98%	Dec. 17, 2004
Investor Class Shares After Taxes on Distribution		12.74%	5.77%	4.82%	Dec. 17, 2004
Investor Class Shares After Taxes on Distribution and Sale of Shares		8.28%	5.38%	4.63%	Dec. 17, 2004
Service Class Shares		11.63%	6.63%	5.99%	Dec. 17, 2004
JPMorgan Domestic High Yield Index	[1]	15.39%	10.46%	8.56%

Average annual total returns are shown on a before- and after-tax basis for Investor Class shares only. After-tax returns for Service Class shares will vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold the Fund’s shares through tax-deferred arrangements, such as a retirement account. After-tax returns may exceed the return before taxes due to a tax benefit from realizing a capital loss on a sale of shares.

[1] ProFund Advisors LLC ("ProFund Advisors" or the "Advisor") has contractually agreed to waive Investment Advisory and Management Services Fees and to reimburse Other Expenses to the extent Total Annual Fund Operating Expenses, as a percentage of average daily net assets, exceed 1.95% for Investor Class shares and 2.95% for Service Class shares through February 28, 2014. After such date, the expense limitation may be terminated or revised by the Advisor. Amounts waived or reimbursed in a particular contractual period may be recouped by ProFund Advisors within three years of the end of the contractual period to the extent that recoupment will not cause the Fund's expenses to exceed any expense limitation in place at that time.

[1] Reflects no deduction for fees, expenses or taxes. Adjusted to reflect the reinvestment of dividends paid by companies in the Index. Since inception returns are calculated from the date the Fund commenced operations, not the date of inception of the Index.

XML

Document and Entity Information	12 Months Ended
	Feb. 28, 2013
Risk/Return:
Document Type	485BPOS
Document Period End Date	Oct. 31, 2012
Registrant Name	Access One Trust
Central Index Key	0001301123
Amendment Flag	false
Document Creation Date	Feb. 28, 2013
Document Effective Date	Feb. 28, 2013
Prospectus Date	Feb. 28, 2013

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Access One Trust
Prospectus Date	rr_ProspectusDate	Feb. 28, 2013
ACCESS FLEX BEAR HIGH YIELD FUND
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Access Flex Bear High Yield Fund        TICKERS :: Investor Class AFBIX :: Service Class AFBSX Important Information About the Fund If Access Flex Bear High Yield Fund (the “Fund”) is successful in meeting its objective, its net asset value should generally lose value as the high yield market (i.e., U.S. corporate high yield debt market) is rallying (gaining value). Conversely, its net asset value should generally increase in value as the high yield market is falling (losing value). These results are generally opposite those of most traditional high yield mutual funds.
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to provide investment results that correspond generally to the inverse of the total return of the high yield market consistent with maintaining reasonable liquidity.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The table below describes the fees and expenses that you may pay if you buy or hold shares of the Fund.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	February 28, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover 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 Annual Fund Operating Expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s annual portfolio turnover rate was 0% of the average value of its entire portfolio. This portfolio turnover rate is calculated without regard to cash instrument or derivatives transactions. If such transactions were included, the Fund’s portfolio turnover rate would be significantly higher.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	0.00%
Expense Example [Heading]	rr_ExpenseExampleHeading	Example:
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This 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 the Fund for the time periods indicated and then redeem all of your shares at the end of each period. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, except that the fee waiver/expense reimbursement is assumed only to pertain to the first year. Although your actual cost may be higher or lower, based on these assumptions your approximate costs would be:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	The Fund pays transaction and financing costs associated with transacting in securities and derivatives. These costs are not reflected in the example or the table above.
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund invests primarily in derivatives and money market instruments that ProFund Advisors believes, in combination, should provide investment results that inversely correspond to the high yield market. Derivatives — The Fund invests in derivatives, which are financial instruments whose value is derived from the value of an underlying asset, interest rate or index. The Fund invests in derivatives as a substitute for directly shorting debt securities in order to gain inverse exposure to the high yield market. These derivatives principally include: Credit Default Swaps (“CDSs”) — Bilateral financial contracts that transfer credit exposure between two parties. CDSs may be used by the Fund to obtain credit risk exposure similar to that of a direct investment in high yield bonds. One party to a CDS (the “buyer”) receives credit protection or sheds credit risk, whereas the other party (the “seller”) to a CDS is selling credit protection or taking on credit risk. The seller typically receives one or more pre-determined periodic payments from the buyer. These payments are in consideration for guaranteeing to make a specific payment to the buyer should a negative credit event occur with respect to one of the issuers referenced in the CDS. The seller of an “unfunded” CDS would not make any payments to the buyer unless there is a negative credit event. Futures Contracts — A standardized contract traded on, or subject to the rules of, an exchange that calls for the future delivery of a specified quantity and type of asset at a specified time and place or, alternatively, may call for cash settlement. Money Market Instruments — The Fund invests in short-term cash instruments that have a remaining maturity of 397 days or less and exhibit high quality credit profiles , including: U.S. Treasury Bills — U.S. government securities that have initial maturities of one year or less, and are supported by the full faith and credit of the United States. Repurchase Agreements — Contracts in which a seller of securities, usually U.S. government securities or other money market instruments, agrees to buy them back at a specified time and price. Repurchase agreements are primarily used by the Fund as a short-term investment vehicle for cash positions. The Fund seeks to maintain inverse exposure to the high yield market regardless of market conditions and without taking defensive positions in cash or other instruments in anticipation of periods favorable for the high yield market (which would generally be adverse market conditions for this Fund). As a result, the Fund may not achieve its investment objective during these periods. To find out if the Fund has sufficient assets to invest to attempt to meet its objective, you may call 1-888-776-3637. There is no assurance that the Fund will achieve its investment objective. The Fund may invest up to 25% of its assets in foreign securities or financial instruments with respect to foreign securities. Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the Fund’s full Prospectus for additional details.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You could lose money by investing in the Fund. Active Investor Risk — The Fund permits short-term trading of its securities. A significant portion of assets invested in the Fund come from professional money managers and investors who use the Fund as part of active trading or tactical asset allocation strategies. These strategies often call for frequent trading to take advantage of anticipated changes in market conditions, which could increase portfolio turnover and may result in additional costs for the Fund. In addition, large movements of assets into and out of the Fund may have a negative impact on the Fund’s ability to achieve its investment objective or maintain a consistent level of operating expenses. In certain circumstances, the Fund’s expense ratio may vary from current estimates or the historical ratio disclosed in this Prospectus. Risks Associated with the Use of Derivatives — The Fund uses investment techniques, such as investing in derivatives, that may be considered aggressive. Investing in derivatives may expose the Fund to greater risks than investing directly in the reference asset(s) underlying those derivatives, such as counterparty risk and liquidity risk (each as discussed below). When the Fund uses derivatives, there may be imperfect correlation between the value of the reference asset(s) and the derivative, which may prevent the Fund from achieving its investment objective. Moreover, with respect to the use of swap agreements, if a reference asset has a dramatic intraday move that causes a material decline in the Fund’s net assets, the terms of a swap agreement between the Fund and its counterparty may permit the counterparty to immediately close out the transaction with the Fund. In that event, the Fund may be unable to enter into another swap agreement or invest in other derivatives to achieve the desired exposure consistent with the Fund’s investment objective. This, in turn, may prevent the Fund from achieving its investment objective, even if the reference asset reverses all or a portion of its intraday move by the end of the day. Any financing, borrowing and other costs associated with using derivatives may also have the effect of lowering the Fund’s return. CDS (Credit Default Swap) Risk – The Fund will normally be a net “buyer” of CDSs. When the Fund is a buyer of an unfunded CDS, upon the occurrence of a credit event, the counterparty to the Fund has an obligation to pay the full notional value of a defaulted reference obligation and take delivery from the Fund of such obligation either through physical settlement or cash settlement. Since CDSs may be physically settled, the Fund may first need to purchase the obligation in order to deliver it and obtain par value payment or an equivalent cash value. An active market may not exist for any of the CDSs in which the Fund invests or in the reference obligation subject to the CDSs. As a result, the Fund’s ability to maximize returns or minimize losses on such CDSs may be impaired. Other risks of CDSs include the difficulties in valuing a CDS depending on whether an active market exists for them or the lack of pricing transparency and the risk that the CDSs utilized by the Fund perform in a manner that does not inversely correlate to the high yield market or perform in other ways that are not expected. The Fund’s positions in CDSs are also subject to counterparty risk, market risk and interest rate risk. Because certain CDSs involve many reference issuers and there are no limitations on the notional amount established for CDSs, the Fund may use a single counterparty or a small number of counterparties, in which case, counterparty risk would be amplified. A CDS may involve greater risks than investing directly in the underlying reference obligations. For example, a CDS may increase the Fund’s credit risk because it has exposure to both the issuer of the underlying reference obligation and the counterparty to the CDS. Investing in CDSs may be considered an aggressive investment technique. Counterparty Risk — The Fund will be subject to credit risk (i.e., the risk that a counterparty is unwilling or unable to make timely payments to meet its contractual obligations) with respect to the amount it expects to receive from counterparties to derivatives or repurchase agreements entered into by the Fund. If a counterparty becomes bankrupt or fails to perform its obligations, the value of your investment in the Fund may decline. Exposure to Debt Instrument Risk — The Fund may invest in, or seek exposure to, debt instruments. Debt instruments may have varying levels of sensitivity to changes in interest rates, credit risk and other factors. Many types of debt instruments are subject to prepayment risk, which is the risk that the issuer of the security will repay principal prior to the maturity date. Debt instruments allowing prepayment may offer less potential for gains during a period of declining interest rates. In addition, changes in the credit quality of the issuer of a debt instrument can also affect the price of a debt instrument, as can an issuer’s default on its payment obligations. Such factors may cause the value of an investment in the Fund to change. Also, the securities of certain U.S. government agencies, authorities or instrumentalities are neither issued by nor guaranteed as to principal and interest by the U.S. government, and may be exposed to more credit risk than securities issued by and guaranteed as to principal and interest by the U.S. government. All U.S. government securities are subject to credit risk. It is possible that the U.S. government may not be able to meet its financial obligations or that securities issued by the U.S. government may experience credit downgrades. Such a credit event may also adversely impact the financial markets. While the realization of certain of these risks may benefit the Fund because the Fund seeks investments results that correspond to the inverse of the high yield market, such occurrences may introduce more volatility to the Fund. High Yield Risk — Investment in or exposure to high yield (lower rated) debt instruments (also known as “junk bonds”) may involve greater levels of interest rate, credit, liquidity and valuation risk than for higher rated instruments. High yield debt instruments may be sensitive to economic changes, political changes, or adverse developments specific to a company. These securities are subject to greater risk of loss, greater sensitivity to interest rate and economic changes, valuation difficulties, and a potential lack of a secondary or public market for securities. High yield debt instruments are considered predominantly speculative with respect to the issuer’s continuing ability to make principal and interest payments and, therefore, such instruments generally involve greater risk of default or price changes than higher rated debt instruments. An economic downturn or period of rising interest rates could adversely affect the market for these securities and reduce market liquidity (liquidity risk). Less active markets may diminish the Fund’s ability to obtain accurate market quotations when valuing the portfolio securities and thereby give rise to valuation risk. High yield debt instruments may also present risks based on payment expectations. For example, these instruments may contain redemption or call provisions. If an issuer exercises these provisions in a declining interest rate market, the Fund would have to replace the security with a lower yielding security, resulting in a decreased return for investors. If the issuer of a security is in default with respect to interest or principal payments, the issuer’s security could lose its entire value. Furthermore, the transaction costs associated with the purchase and sale of high yield debt instruments may vary greatly depending upon a number of factors and may adversely affect the Fund’s performance. While the realization of certain of these risks may benefit the Fund because the Fund seeks investments results that correspond to the inverse of the high yield market, such occurrences may introduce more volatility to the Fund. Early Close/Late Close/Trading Halt Risk — An exchange or market may close early, close late or issue trading halts on specific securities, or the ability to buy or sell certain securities or financial instruments may be restricted, which may result in the Fund being unable to buy or sell certain securities or financial instruments. In such circumstances, the Fund may be unable to rebalance its portfolio, may be unable to accurately price its investments and/or may incur substantial trading losses. Interest Rate Risk — Interest rate risk is the risk that debt securities or certain financial instruments may fluctuate in value due to changes in interest rates. Commonly, investments subject to interest rate risk will decrease in value when interest rates rise and increase in value when interest rates decline. The opposite is true for the Fund. As a Fund seeking investment results that correspond to the inverse of the high yield market, the Fund’s performance will generally be more favorable when interest rates rise and less favorable when interest rates decline. The value of securities with longer maturities may fluctuate more in response to interest rate changes than securities with shorter maturities. Inverse Correlation Risk — Shareholders should lose money when the high yield market gains value — a result that is the opposite from the results of investing in traditional high yield mutual funds. Liquidity Risk — In certain circumstances, such as the disruption of the orderly markets for the securities or financial instruments in which the Fund invests, the Fund might not be able to acquire or dispose of certain holdings quickly or at prices that represent true market value in the judgment of ProFund Advisors. Markets for the securities or financial instruments in which the Fund invests may be disrupted by a number of events, including but not limited to economic crises, natural disasters, new legislation, or regulatory changes inside or outside of the U.S. For example, regulation limiting the ability of certain financial institutions to invest in certain securities would likely reduce the liquidity of those securities. Such situations may prevent the Fund from limiting losses, realizing gains or achieving a high inverse correlation with the total return of the high yield market. Market Risk — The Fund is subject to market risks that will affect the value of its shares, including adverse issuer, political, regulatory, market or economic developments, as well as developments that impact specific economic sectors, industries or segments of the market. As a fund seeking investment results that correspond to the inverse of the high yield market, the Fund’s performance will generally decrease when market conditions cause improved performance in the high yield market. Non-Diversification Risk — The Fund is classified as “non-diversified” under the Investment Company Act of 1940, and has the ability to invest a relatively high percentage of its assets in the securities of a small number of issuers susceptible to a single economic, political or regulatory event, or in financial instruments with a single counterparty if ProFund Advisors determines that doing so is the most efficient means of meeting the Fund’s investment objective. This makes the performance of the Fund more susceptible to adverse impact to an issuer or counterparty than a diversified fund might be. Portfolio Turnover Risk — The Fund’s strategy typically involves high portfolio turnover to manage the Fund’s investment exposure. Additionally, active trading of the Fund’s shares may cause more frequent purchase and sales activities that could, in certain circumstances, increase the number of portfolio transactions. High levels of transactions increase brokerage costs and may result in increased taxable capital gains. Short Sale Exposure Risk — The Fund may seek inverse exposure through financial instruments, which may cause the Fund to be exposed to certain risks associated with selling securities short. These risks include, under certain market conditions, an increase in the volatility and decrease in the liquidity of securities underlying the short position, which may adversely impact the Fund’s return, result in a loss, have the effect of limiting the Fund’s ability to obtain inverse exposure through financial instruments such as swap agreements, or require the Fund to seek inverse exposure through alternative investment strategies that may be less desirable or may be costly to implement. To the extent that, at any particular point in time, the securities underlying the short position may be thinly traded or have a limited market, including due to regulatory action, the Fund may be unable to meet its investment objective (e.g., due to a lack of available securities or counterparties). During such periods, the Fund’s ability to issue additional shares may be adversely affected. Obtaining inverse exposure through these instruments may be considered an aggressive investment technique. Valuation Risk — In certain circumstances, portfolio securities may be valued using techniques other than market quotations. The value established for a portfolio security may be different from what would be produced through the use of another methodology or if it had been priced using market quotations. Portfolio securities that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their value from one day to the next than would be the case if market quotations were used. In addition, there is no assurance that the Fund could sell a portfolio security for the value established for it at any time, and it is possible that the Fund would incur a loss because a portfolio security is sold at a discount to its established value. Valuation Time Risk — The Fund typically values its portfolio at 4:00 p.m. (Eastern time). In certain cases, the bond markets close before such time or may not be open for business on the same calendar days as the Fund. As a result, the daily performance of the Fund may vary, perhaps significantly, from the performance of the high yield market. Please see “Investment Objectives, Principal Investment Strategies and Related Risks” in the Fund’s full Prospectus for additional details.
Risk Lose Money [Text]	rr_RiskLoseMoney	You could lose money by investing in the Fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Non-Diversification Risk — The Fund is classified as “non-diversified” under the Investment Company Act of 1940, and has the ability to invest a relatively high percentage of its assets in the securities of a small number of issuers susceptible to a single economic, political or regulatory event, or in financial instruments with a single counterparty if ProFund Advisors determines that doing so is the most efficient means of meeting the Fund’s investment objective. This makes the performance of the Fund more susceptible to adverse impact to an issuer or counterparty than a diversified fund might be.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Investment Results
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart below shows how the Fund’s investment results for Investor Class shares have varied from year to year, and the table shows how the Fund’s average annual total returns for various periods compare with a broad measure of market performance. This information provides some indication of the risks of investing in the Fund. Past results (before and after taxes) are not predictive of future results. Updated information on the Fund’s results can be obtained by visiting ProFunds.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart below shows how the Fund’s investment results for Investor Class shares have varied from year to year, and the table shows how the Fund’s average annual total returns for various periods compare with a broad measure of market performance.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	ProFunds.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Past results (before and after taxes) are not predictive of future results.
Bar Chart [Heading]	rr_BarChartHeading	Annual Returns of Investor Class Shares as of December 31 each year
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter (ended 3/31/2009): 13.14%; Worst Quarter (ended 9/30/2009): -12.18%.
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns As of December 31, 2012
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Reflects no deduction for fees, expenses or taxes.
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold the Fund’s shares through tax-deferred arrangements, such as a retirement account.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	Average annual total returns are shown on a before- and after-tax basis for Investor Class shares only. After-tax returns for Service Class shares will vary.
Performance Table Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	After-tax returns may exceed the return before taxes due to a tax benefit from realizing a capital loss on a sale of shares.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	Average annual total returns are shown on a before- and after-tax basis for Investor Class shares only. After-tax returns for Service Class shares will vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold the Fund’s shares through tax-deferred arrangements, such as a retirement account. After-tax returns may exceed the return before taxes due to a tax benefit from realizing a capital loss on a sale of shares.
ACCESS FLEX BEAR HIGH YIELD FUND | Investor Class
Risk/Return:	rr_RiskReturnAbstract
Wire Fee	rr_ShareholderFeeOther	10
Investment Advisory Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses: Recoupment	rr_Component1OtherExpensesOverAssets	0.05%	[1]
Other Expenses: Other Operating Expenses	rr_Component2OtherExpensesOverAssets	1.79%
Total Annual Fund Operating Expenses Before Fee Waivers and Expense Reimbursements	rr_ExpensesOverAssets	2.59%
Fee Waivers/Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.81%)	[1]
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	rr_NetExpensesOverAssets	1.78%
1 Year	rr_ExpenseExampleYear01	181
3 Years	rr_ExpenseExampleYear03	729
5 Years	rr_ExpenseExampleYear05	1,303
10 Years	rr_ExpenseExampleYear10	2,864
2006	rr_AnnualReturn2006	(3.47%)
2008	rr_AnnualReturn2007	0.55%
2008	rr_AnnualReturn2008	(0.04%)
2009	rr_AnnualReturn2009	(19.63%)
2010	rr_AnnualReturn2010	(20.17%)
2011	rr_AnnualReturn2011	(10.59%)
2012	rr_AnnualReturn2012	(17.60%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	13.14%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2009
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(12.18%)
One Year	rr_AverageAnnualReturnYear01	(17.60%)
Five Years	rr_AverageAnnualReturnYear05	(13.92%)
Since Inception	rr_AverageAnnualReturnSinceInception	(10.37%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 27, 2005
ACCESS FLEX BEAR HIGH YIELD FUND | Service Class
Risk/Return:	rr_RiskReturnAbstract
Wire Fee	rr_ShareholderFeeOther	10
Investment Advisory Fees	rr_ManagementFeesOverAssets	0.75%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Recoupment	rr_Component1OtherExpensesOverAssets	0.05%	[1]
Other Expenses: Other Operating Expenses	rr_Component2OtherExpensesOverAssets	1.79%
Total Annual Fund Operating Expenses Before Fee Waivers and Expense Reimbursements	rr_ExpensesOverAssets	3.59%
Fee Waivers/Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.81%)	[1]
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	rr_NetExpensesOverAssets	2.78%
1 Year	rr_ExpenseExampleYear01	281
3 Years	rr_ExpenseExampleYear03	1,025
5 Years	rr_ExpenseExampleYear05	1,791
10 Years	rr_ExpenseExampleYear10	3,801
One Year	rr_AverageAnnualReturnYear01	(18.45%)
Five Years	rr_AverageAnnualReturnYear05	(14.82%)
Since Inception	rr_AverageAnnualReturnSinceInception	(11.31%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 27, 2005
ACCESS FLEX BEAR HIGH YIELD FUND | After Taxes on Distribution | Investor Class
Risk/Return:	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	(17.60%)
Five Years	rr_AverageAnnualReturnYear05	(13.92%)
Since Inception	rr_AverageAnnualReturnSinceInception	(10.53%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 27, 2005
ACCESS FLEX BEAR HIGH YIELD FUND | After Taxes on Distribution and Sale of Shares | Investor Class
Risk/Return:	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	(11.44%)
Five Years	rr_AverageAnnualReturnYear05	(11.22%)
Since Inception	rr_AverageAnnualReturnSinceInception	(8.28%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Apr. 27, 2005
ACCESS FLEX BEAR HIGH YIELD FUND | JPMorgan Domestic High Yield Index
Risk/Return:	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	15.39%	[2]
Five Years	rr_AverageAnnualReturnYear05	10.46%	[2]
Since Inception	rr_AverageAnnualReturnSinceInception	9.19%	[2]

[1] ProFund Advisors LLC ("ProFund Advisors" or the "Advisor") has contractually agreed to waive Investment Advisory and Management Services Fees and to reimburse Other Expenses to the extent Total Annual Fund Operating Expenses Before Fee Waivers and Expense Reimbursements, as a percentage of average daily net assets, exceed 1.78% for Investor Class shares and 2.78% for Service Class shares through February 28, 2014. After such date, the expense limitation may be terminated or revised by the Advisor. Amounts waived or reimbursed in a particular contractual period may be recouped by ProFund Advisors within three years of the end of the contractual period to the extent that recoupment will not cause the Fund's expenses to exceed any expense limitation in place at that time.

[2] Reflects no deduction for fees, expenses or taxes. Adjusted to reflect the reinvestment of dividends paid by companies in the Index. Since inception returns are calculated from the date the Fund commenced operations, not the date of inception of the Index.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Access One Trust
Prospectus Date	rr_ProspectusDate	Feb. 28, 2013
Document Creation Date	dei_DocumentCreationDate	Feb. 28, 2013