2.2.0.25truefalse040000 - Disclosure - Risk/Return Detail Data {Elements}truetruefalse1falsefalsefalsefalse4/19/2011 - 4/19/2011 eol_0001135428-11-000239_STD_1_20110419_0http://www.sec.gov/CIK0000878719duration2011-04-19T00:00:002011-04-19T00:00:00pureStandardhttp://www.xbrl.org/2003/instancepure0iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso421702true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse3false0rr_ProspectusDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002011-04-19falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date of the prospectus.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 1 -Paragraph 3 -Subsection a falsefalse4false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse1falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : SummaryS000031873-1 Member {dei_LegalEntityAxis} : S000031873 Member 4/19/2011 - 4/19/2011 eol_0001135428-11-000239_STD_1_20110419_0_396770x-9992452_396840x-9992451http://www.sec.gov/CIK0000878719duration2011-04-19T00:00:002011-04-19T00:00:00falsefalseAviva Investors Emerging Markets Local Currency Bond Fund (First Prospectus Summary)dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldick0000878719_SummaryS000031873-1Memberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseAviva Investors Emerging Markets Local Currency Bond Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000878719_S000031873Memberdei_LegalEntityAxisexplicitMemberOthernaNo definition available.No authoritative reference available.falsefalse5true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse6false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00AVIVA INVESTORS EMERGING MARKETS LOCAL CURRENCY BOND FUNDfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalse7false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00INVESTMENT OBJECTIVEfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse8false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>The Aviva Investors Emerging Markets Local Currency Bond Fund (the "Fund") seeks capital growth and income by investing in local currencies and bonds of issuers in worldwide emerging market countries.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalse9false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00FUND FEES AND EXPENSESfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. 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. 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 portfolio turnover rate was __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalse10false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>This table describes the fees and expenses that you may pay if you buy and hold Institutional Class Shares of the Fund.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalse11false0rr_ShareholderFeesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00SHAREHOLDER FEES (FEES PAID DIRECTLY FROM YOUR INVESTMENT)falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringShareholder Fees (fees paid directly from your investment).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subsection table falsefalse12false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT YOU PAY EACH YEAR AS A PERCENTAGE OF THE VALUE OF YOUR INVESTMENT)falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalse13false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00PORTFOLIO TURNOVERfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalse14false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in total annual fund operating expenses or in the example, affect the Fund's performance.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalse15false0rr_OtherExpensesNewFundBasedOnEstimatesrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Other Expenses are based on estimated amounts for the current fiscal year.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThis element represents the disclosure for new funds that "Other Expenses" are based on estimated amounts for the current fiscal year.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 6 -Subparagraph a -Subsection instructions falsefalse16false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00EXAMPLEfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse17false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>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 those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses (including capped expenses for the period described in the fee table) remain the same.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalse18false0rr_ExpenseExampleByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Although your actual costs may be higher or lower, based on these assumptions your costs would be:falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse19false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00PRINCIPAL INVESTMENT STRATEGIESfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse20false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>In seeking to achieve its objective, the Fund, under normal circumstances, invests at least 80% of its net assets (plus any borrowings for investment purposes) in emerging market bonds denominated in emerging market currencies. This investment policy may be changed upon 60 days' prior notice to shareholders. The Fund's emerging market bond investments include debt securities issued by emerging market governments, their agencies and instrumentalities ("quasi-governmental") and emerging market corporate issuers, as well as Eurobonds and other debt securities issued by supranational organizations that are denominated in emerging markets currencies. Aviva Investors North America, Inc. (the "Adviser"), the Fund's investment adviser, considers an emerging market country to be generally a country that the International Bank for Reconstruction and Development (World Bank) and the International Finance Corporation would consider to be an emerging or developing country. A company generally will be considered to be located in a particular emerging market country if it meets one or more of the following criteria: (i) the company is organized under the laws of and headquartered in, or maintains its principal place of business in, the country; (ii) during the company's most recent fiscal year, it derived at least 50% of its revenues or profits from goods or services produced or sold, investments made or services performed in the country; or (iii) the company has at least 50% of its assets in the country. The Fund is non-diversified, meaning that it may invest a large percentage of its assets in a single issuer or a relatively small number of issuers. The Fund may invest without limit in emerging market countries that have sovereign ratings below investment grade or are unrated, and the corporate debt securities in which the Fund invests may be rated below investment grade (commonly known as "high-yield" or "junk" bonds). In addition, the Fund may use derivatives such as futures, options, swaps (including interest rate, credit default and cross-currency swaps), options on swaps, forward rate agreements and forward currency contracts to manage the Fund's currency and risk exposure. In selecting investments for the Fund, the Adviser seeks to construct a portfolio of securities to be held over a relatively long term investment horizon. The Adviser evaluates emerging markets and their issuers through a combination of country analysis, global macroeconomic analysis, quantitative analysis and yield curve comparisons, with the aim of making investments with optimal risk-reward profiles. The Adviser also gives consideration to the composition of various emerging markets debt indices, including the Fund's benchmark, the Barclays Emerging Markets Local Currency Government Diversified Index. In conducting its country analysis, the Adviser seeks to identify changes in the credit quality of emerging market countries and to highlight opportunities for adding value to the Fund's portfolio by increasing exposures to certain countries and avoiding others. The Adviser also seeks to identify global macroeconomic themes that may affect emerging markets, such as price movements in commodities and changes in currency rates against major currencies. The Adviser uses quantitative analysis to evaluate long-term, short-term and technical factors to identify the most attractive investments. Finally, the Adviser conducts yield curve comparisons through the screening and monitoring of the investible universe. Generally, securities are sold: (i) when the credit quality of an issuer has deteriorated; (ii) when the Adviser's analyses of a security has changed; (iii) incrementally to exit semi-liquid positions to take profits; or (iv) when the Adviser believes another security provides a superior investment alternative.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalse21false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00PRINCIPAL RISKSfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalse22false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>As with all mutual funds, a shareholder is subject to the risk that his or her investment could lose money. A Fund share is not a bank deposit and it is not insured or guaranteed by the FDIC or any government agency. The principal risk factors affecting shareholders' investments in the Fund are set forth below. FOREIGN SECURITIES RISK. Investing in securities of foreign issuers and governments poses additional risks since political and economic events unique to a country or region will affect foreign securities markets and their issuers. Political events (civil unrest, national elections, changes in political conditions and foreign relations, imposition of exchange controls and repatriation restrictions), social and economic events (labor strikes, rising inflation) and natural disasters occurring in a country where the Fund invests could cause the Fund's investments in that country to experience gains or losses. These risks will not necessarily affect the U.S. economy or similar issuers located in the United States. In addition, investments in securities of foreign issuers are generally denominated in a foreign currency. As a result, changes in the value of those currencies compared to the U.S. dollar may affect (positively or negatively) the value of the Fund's investments. These currency movements may occur separately from, and in response to, events that do not otherwise affect the value of the security in the issuer's home country. EMERGING MARKETS RISK. Investments in emerging market securities are considered speculative and subject to heightened risks in addition to the general risks of investing in non-U.S. securities. Unlike more established markets, emerging markets may have governments that are less stable, markets that are less liquid and economies that are less developed and based on only a few industries. Differences in tax and accounting standards and difficulties in obtaining information about foreign governments or foreign companies may impair investment decisions. In addition, emerging market securities may experience limited trading, may be issued by companies with smaller market capitalizations and may suffer periods of relative illiquidity; significant price volatility; restrictions on foreign investment; and possible restrictions on repatriation of investment income and capital. Furthermore, emerging market governments may have limited ability to raise taxes or authorize appropriations for debt repayment. In addition, foreign investors may be required to register the proceeds of sales, and future economic or political crises could lead to price controls, forced mergers, expropriation or confiscatory taxation, seizure, nationalization or creation of government monopolies. Because non-U.S. securities are usually denominated in currencies other than the dollar, the value of the Fund's portfolio may be influenced by currency exchange rates and exchange control regulations. The currencies of emerging market countries may experience significant declines against the U.S. dollar, and devaluation may occur subsequent to investments in these currencies by the Fund. Inflation and rapid fluctuations in inflation rates have had, and may continue to have, negative effects on the economies and securities markets of certain emerging market countries. Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse to pay interest or repay principal on its sovereign debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the relative size of the governmental entity's debt position in relation to the economy or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies. INTEREST RATE RISK. As with most funds that invest in debt securities, changes in interest rates are one of the most important factors that could affect the value of your investment. Rising interest rates tend to cause the prices of fixed income securities (especially those with longer maturities) and the Fund's share price to fall. The concept of duration is useful in assessing the sensitivity of a fixed income fund to interest rate movements, which are usually the main source of risk for most fixed-income funds. Duration measures price volatility by estimating the change in price of a debt security for a 1% change in its yield. For example, a duration of five years means the price of a debt security will change about 5% for every 1% change in its yield. Thus, the higher duration, the more volatile the security. Debt securities have a stated maturity date when the issuer must repay the principal amount of the bond. Some debt securities, known as callable bonds, may repay the principal earlier than the stated maturity date. Debt securities are most likely to be called when interest rates are falling because the issuer can refinance at a lower rate. If this occurs, the Fund may be required to invest the proceeds in securities with lower yields. Mutual funds that invest in debt securities have no real maturity. Instead, they calculate their weighted average maturity. This number is an average of the effective or anticipated maturity of each debt security held by the mutual fund, with the maturity of each security weighted by the percentage of its assets of the mutual fund it represents. CREDIT RISK. The credit rating or financial condition of an issuer may affect the value of a debt security. Generally, the lower the quality rating of a security, the greater the perceived risk that the issuer will fail to pay interest fully and return principal in a timely manner. If an issuer defaults or becomes unable to honor its financial obligations, the security may lose some or all of its value. The issuer of an investment-grade security is considered by the ratings agency to be more likely to pay interest and repay principal than an issuer of a lower rated bond. Adverse economic conditions or changing circumstances may weaken the capacity of the issuer to pay interest and repay principal. HIGH YIELD BOND RISK. High yield, or non-investment grade or "junk," bonds are highly speculative securities that are usually issued by smaller, less credit worthy and/or highly leveraged (indebted) companies. Compared with investment-grade bonds, high yield bonds are considered to carry a greater degree of risk and are considered to be less likely to make payments of interest and principal. Market developments and the financial and business conditions of the corporation issuing these securities generally influence their price and liquidity more than changes in interest rates, when compared to investment-grade debt securities. Insufficient liquidity in the non-investment grade bond market may make it more difficult to dispose of non-investment grade bonds and may cause the Fund to experience sudden and substantial price declines. A lack of reliable, objective data or market quotations may make it more difficult to value non-investment grade bonds accurately. DERIVATIVES RISK. The Fund may use derivatives, including futures, options, forward currency contracts, swaps, options on swaps and forward rate agreements to manage the Fund's currency exposure, change the Fund's risk exposure or maximize positive returns. Futures contracts provide for the future sale by one party and purchase by another party of a specified amount of a specific security at a specified future time and at a specified price. An option is a contract between two parties for the purchase and sale of a financial instrument for a specified price at any time during the option period. Unlike a futures contract, an option grants a right (not an obligation) to buy or sell a financial instrument. An option on a futures contract gives the purchaser the right, in exchange for a premium, to assume a position in a futures contract at a specified exercise price during the term of the option. A forward currency contract involves an obligation to purchase or sell a specific amount of currency at a future date or date range at a specific price, thereby fixing the exchange rate for a specified time in the future. A credit default swap enables the Fund to buy or sell protection against a defined credit event of an issuer or a basket of securities. Generally, the seller of credit protection against an issuer or basket of securities receives a periodic payment to compensate against potential default events. In contrast, the buyer of a credit default swap would have the right to deliver a referenced debt obligation and receive the par (or other agreed-upon) value or receive a cash payment in the event of a default or other credit event by the reference issuer, such as a U.S. or foreign corporation, with respect to its debt obligations. Once a credit event has been determined, an auction may be held to determine the recovery price at which investors will be compensated. The auction takes place in three steps: 1) dealers submit prices at which they would buy and sell the reference debt obligation and dealers who submit crossing prices must trade at those prices while the remaining prices are used to calculate a mid-market price; 2) dealers then submit limit orders (orders to buy or sell an amount of the reference obligation at a firm price) which are matched against outstanding buy or sell requests; 3) once all limit orders have been matched, residual orders are cleared at a level that is within a few points of the mid-market price and this clearing price is used to cash settle any other outstanding payments due to investors. Interest rate swaps involve one party, in return for a premium, agreeing to make payments to another party to the extent that interest rates exceed or fall below a specified rate (a "cap" or "floor," respectively). A currency swap is an agreement between two parties in which one party agrees to make interest rate payments in one currency and the other promises to make interest rate payments in another currency. A forward rate agreement involves an obligation to borrow or lend a specific amount of money at a future date at a specific rate. Forward rate agreements are typically settled at maturity not through actual lending or borrowing of money but by a cash payment that represents the difference in the cost of lending as implied in the agreement and the cost of lending in the market for a similar term on the maturity rate. Derivatives may be more volatile than other investments and may magnify the Fund's gains or losses. There are various factors that affect the Fund's ability to achieve its investment objective with derivatives. Successful use of a derivative depends upon the degree to which prices of the underlying assets correlate with price movements in the derivatives the Fund enters into. The Fund could be negatively affected if the change in market value of its securities fails to correlate perfectly with the values of its derivative positions. The lack of a liquid secondary market for a derivative may prevent the Fund from closing its derivative positions and could adversely impact its ability to achieve its investment objective or to realize profits or limit losses. The Fund can gain market exposure using derivatives by paying a fraction of the market value of the investments underlying those derivatives. Thus, a relatively small price movement in the underlying investment may result in an immediate and substantial gain or loss to the Fund. Derivatives may be more volatile than other investments and the Fund may lose more in a derivative than the cost of opening the derivative position. Additionally, derivative instruments are subject to counterparty risk, meaning that the party that issues the derivative may experience a significant credit event and may be unwilling or unable to make timely settlement payments or otherwise honor its obligations. HEDGING RISK. The Fund may use derivative instruments for hedging purposes. Hedging through the use of these instruments does not eliminate fluctuations in the underlying prices of the securities that the Fund owns or intends to purchase or sell. While entering into these instruments tends to reduce the risk of loss due to a decline in the value of the hedged asset, such instruments also limit any potential gain that may result from the increase in value of the asset. To the extent that the Fund engages in hedging strategies, there can be no assurance that such strategy will be effective or that there will be a hedge in place at any given time. NON-DIVERSIFICATION RISK. Because the Fund is not diversified, it may invest a greater percentage of its assets in a particular issuer than a diversified fund, which may cause the value of its shares to be more sensitive to changes in the market value of a single issuer than a diversified mutual fund.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalse23false0rr_RiskLoseMoneyrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00As with all mutual funds, a shareholder is subject to the risk that his or her investment could lose money.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringSummarize the principal risks of investing in the Fund, including the risks to which the Fund's portfolio as a whole is subject and the circumstances reasonably likely to affect adversely the Fund's net asset value, yield, and total return. Unless the Fund is a Money Market Fund, disclose that loss of money is a risk of investing in the Fund. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Subsection b falsefalse24false0rr_RiskNondiversifiedStatusrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Because the Fund is not diversified, it may invest a greater percentage of its assets in a particular issuer than a diversified fund, which may cause the value of its shares to be more sensitive to changes in the market value of a single issuer than a diversified mutual fund.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf applicable, state that the Fund is non-diversified, describe the effect of non-diversification (e.g., disclose that, compared with other funds, the Fund may invest a greater percentage of its assets in a particular issuer), and summarize the risks of investing in a non-diversified fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph iv -Subsection b falsefalse25false0rr_RiskNotInsuredDepositoryInstitutionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00A Fund share is not a bank deposit and it is not insured or guaranteed by the FDIC or any government agency.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIf the Fund is advised by or sold through an insured depository institution, state that An investment in the Fund is not a deposit of the bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. A Money Market Fund that is advised by or sold through an insured depository institution should combine the disclosure required by Items 2(c)(1)(ii) and (iii) in a single statement.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph iii -Subsection b falsefalse26false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00PERFORMANCE INFORMATIONfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse27false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>The Fund is new, and therefore has no performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund's return based on net assets and comparing the Fund's performance to a broad measure of market performance.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalse28false0rr_PerformanceOneYearOrLessrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00The Fund is new, and therefore has no performance history.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringFor a Fund that provides annual total returns for only one calendar year or for a Fund that does not include the bar chart because it does not have annual returns for a full calendar year, modify, as appropriate, the narrative explanation required by stating that the information gives some indication of the risks of an investment in the Fund by comparing the Fund's performance with a broad measure of market performance). Provide a brief explanation of how the information illustrates the variability of the Fund's returns (e.g., by stating that the information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare with those of a broad measure of market performance). Provide a statement to the effect that the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph i -Subsection b Reference 2: 2 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subparagraph instructions -Clause 1 -Exhibit b -Subsection b falsefalse29false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsetruefalse{dei_DocumentInformationDocumentAxis} : SummaryS000031873-1 Member {dei_LegalEntityAxis} : S000031873 Member {rr_ProspectusShareClassAxis} : C000099235 Member 4/19/2011 - 4/19/2011 eol_0001135428-11-000239_STD_1_20110419_0_396770x-9992452_396840x-9992451_429423x-9992453http://www.sec.gov/CIK0000878719duration2011-04-19T00:00:002011-04-19T00:00:00falsefalseAviva Investors Emerging Markets Local Currency Bond Fund (First Prospectus Summary)dei_DocumentInformationDocumentAxisxbrldihttp://xbrl.org/2006/xbrldick0000878719_SummaryS000031873-1Memberdei_DocumentInformationDocumentAxisexplicitMemberfalsefalseAviva Investors Emerging Markets Local Currency Bond Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000878719_S000031873Memberdei_LegalEntityAxisexplicitMemberfalsefalseInstitutional Class Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000878719_C000099235Memberrr_ProspectusShareClassAxisexplicitMemberOthernaNo definition available.No authoritative reference available.falsefalse30true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse31false0rr_FeeWaiverOrReimbursementOverAssetsDateOfTerminationrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002012-04-30falsefalsefalsefalsefalseOtherus-types:dateStringItemTypenormalizedstringThis element represents the date of expected termination of any expense reimbursement or fee waiver arrangements that reduce any Fund operating expenses (SEC Form N-1A 2006-09-14 A.3.table.1.11 Total Annual Fund Operating Expenses A.3.instructions.3.e).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph e -Subsection instructions falsefalse32false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse4falsefalseUSDtruefalse{dei_LegalEntityAxis} : S000031873 Member {rr_ProspectusShareClassAxis} : C000099235 Member 4/19/2011 - 4/19/2011 USD ($) $eol_0001135428-11-000239_STD_1_20110419_0_396770x-9992452_429423x-9992453http://www.sec.gov/CIK0000878719duration2011-04-19T00:00:002011-04-19T00:00:00falsefalseAviva Investors Emerging Markets Local Currency Bond Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000878719_S000031873Memberdei_LegalEntityAxisexplicitMemberfalsefalseInstitutional Class Sharesrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000878719_C000099235Memberrr_ProspectusShareClassAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepure0iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse33true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse34false0rr_RedemptionFeeOverRedemptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue-0.0100-0.0100falsefalsefalsefalsefalseOtherrr:NonPositivePure4Typepure"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any redemption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 2 -Subparagraph b -Subsection instructions falsefalse35false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00600.0060falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalse36false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00800.0080[1]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalse37false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.01400.0140falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalse38false0rr_FeeWaiverOrReimbursementOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue-0.0050-0.0050falsefalsefalsefalsefalseOtherrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse39false0rr_NetExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00900.0090[2]falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 11 -Subsection table falsefalse40false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue9292falsetruefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalse41false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue376376falsetruefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalse1Other Expenses are based on estimated amounts for the current fiscal year.2Aviva Investors North America, Inc. (the "Adviser") has contractually agreed to reduce fees and reimburse expenses to the extent necessary to keep Total Annual Fund Operating Expenses after fee Reductions and/or Expense Reimbursements for Institutional Class Shares (excluding interest, taxes, brokerage commissions, acquired fund fees and expenses and extraordinary expenses (collectively, "excluded expenses")) from exceeding 0.90% of the Fund's Institutional Class Shares' average daily net assets until April 30, 2012. In addition, if at any point it becomes unnecessary for the Adviser to reduce fees or make expense reimbursements, the Adviser may retain the difference between the Total Annual Fund Operating Expenses (less excluded expenses) and 0.90% to recapture all or a portion of its prior fee reductions or expense reimbursements made during the preceding three-year period during which this agreement was in place. This agreement (i) may be terminated by the Board, for any reason at any time, (ii) may be terminated by the Adviser upon ninety (90) days' prior written notice to the Trust, effective as of the close of business on April 30, 2012, and (iii) will terminate upon termination of the Adviser's investment advisory agreement with the Fund.140Risk/Return Detail Data (USD $)NoRoundingUnKnownUnKnownUnKnowntruetrue