Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Mar. 29, 2012
PIA High Yield Fund (Second Prospectus Summary) | PIA High Yield Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return, Heading	rr_RiskReturnHeading	PIA High Yield Fund ("High Yield Fund" or "Fund")
Investment Objective, Heading	rr_ObjectiveHeading	Investment Objectives
investment Objective, Primary	rr_ObjectivePrimaryTextBlock	The High Yield Fund's primary objective is to seek a high level of current income.
Investment Objective, Secondary	rr_ObjectiveSecondaryTextBlock	The Fund's secondary objective is to seek capital growth when that is consistent with its primary objective.
Expense, Heading	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense, Narrative	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.
Shareholder Fees, Caption	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses, Caption	rr_OperatingExpensesCaption	ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover	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 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 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 33% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	33.00%
Other Expenses, New Fund, Based on Estimates	rr_OtherExpensesNewFundBasedOnEstimates	Other expenses are based on estimated customary Fund expenses for the current fiscal year.
Expenses, Not Correlated to Ratio Due to Acquired Fund Fees	rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees	Total Annual Fund Operating Expenses do not correlate to the "Ratio of Expenses to Average Net Assets Before Fee Waivers and Expense Reimbursements" in the Financial Highlights of the statutory prospectus, which reflects the operating expenses of the Fund and does not include acquired fund fees and expenses ("AFFE").
Expense Example, Heading	rr_ExpenseExampleHeading	Example
Expense Example, Narrative	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 those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same (taking into account the Expense Cap only in the first year). Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Investment Strategy, Heading	rr_StrategyHeading	Principal Investment Strategies of the Fund
Investment Strategy, Narrative	rr_StrategyNarrativeTextBlock	The Fund invests, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in a diversified portfolio of domestic and foreign high yield instruments, defined as bonds ("junk bonds"), forward commitments, loan participations and assignments, and preferred stocks. High yield instruments are securities rated below investment grade by Moody's Investors Service, Inc. ("Moody's"), or equivalently rated by Standard & Poor's Rating Services ("S&P") or Fitch, Inc. ("Fitch"), or, if unrated, determined by the Adviser to be of comparable quality. The remainder of the Fund's assets may be invested in investment grade instruments including bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities, and loan participations and assignments. The average portfolio duration of the Fund normally varies within two years (plus or minus) of the duration of the Barclays Capital U.S. Corporate High-Yield Index (the "Barclays Index") at any point in time. The Barclays Index had a duration of 4.1 years as of January 31, 2012. Duration is a measure of the expected life of a fixed income security that is used to determine the sensitivity of a security's price to changes in interest rates. The Fund may invest up to 5% of its net assets in securities denominated in foreign currencies. The Fund may invest up to 10% of its net assets in securities and instruments that are economically tied to emerging market countries. The Fund may invest up to 5% of its net assets in derivative instruments, such as options, futures contracts or swap agreements. From time to time, the Fund may experience significant inflows; if this occurs, the Fund may invest up to 30% of its net assets in derivative instruments until such time as the Adviser can identify and invest in appropriate high yield instruments in accordance with the Fund's principal strategy. A derivative is a financial contract whose value is based on (or "derived from") a traditional security (such as a bond) or a market index. The Fund may invest in derivatives for both bona fide hedging purposes and for speculative purposes. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls). In selecting investments for the Fund, the Adviser will consider the risks and opportunities presented by the industries within the high yield universe. The Adviser evaluates the bond issuers within the selected industries and identifies those investments which the Adviser believes have favorable risk reward characteristics and match the Adviser's investing philosophy. The Adviser evaluates various criteria such as historical and future expected financial performance, management tenure and experience, capital structure, free cash flow generation, barriers to entry, security protections, yield and relative value, and ownership structure. Investments are targeted that have individual yield premiums which appear to be favorable and are viewed by the Adviser as having a comparable or lower probability of default and/or loss risk. The Adviser may sell an investment as part of its overall investment decision to reposition assets into a more attractive security or to implement a change in maturity and quality to the overall portfolio.
Risk, Heading	rr_RiskHeading	Principal Risks of Investing in the Fund
Risk, Narrative	rr_RiskNarrativeTextBlock	Losing all or a portion of your investment is a risk of investing in the Fund. The success of the Fund cannot be guaranteed. There are risks associated with investments in the types of securities in which the Fund invests. These risks include: ·  Risks Associated with High Yield Securities. High yield securities (or "junk      bonds") entail greater risk of loss of principal because of their greater         exposure to credit risk.                                                       ·  Counterparty Risk. Fund transactions involving a counterparty are subject to      the risk that the counterparty or a third party will not fulfill its              obligation to the Fund. Counterparty risk may arise because of the                counterparty's financial condition (i.e., financial difficulties, bankruptcy,    or insolvency), market activities and developments, or other reasons, whether    foreseen or not. A counterparty's inability to fulfill its obligation may         result in significant financial loss to the Fund.                                 ·  Credit Risk. The issuers of the bonds and other instruments held by the Fund      may not be able to make interest or principal payments.                        ·  Market Risk. The prices of the securities in which the Fund invests may           decline for a number of reasons including responses to economic and political    developments.                                                                     ·  Management Risk. The Fund is subject to management risk because it is an          actively managed portfolio. The Adviser's management practices and investment    strategies might not work to produce the desired results.                         ·  Interest Rate Risk. In general, the value of bonds and other instruments falls    when interest rates rise. Longer term obligations are usually more sensitive      to interest rate changes than shorter term obligations.                        ·  Liquidity Risk. Low or lack of trading volume may make it difficult to sell       securities or derivative instruments held by the Fund at quoted market prices.    ·  Derivatives Risk. Derivatives involve the risk of improper valuation, the risk    of ambiguous documentation and the risk that changes in the value of the          derivative may not correlate perfectly with the underlying security.              ·  Leverage Risk. Leverage risk is the risk that losses from a derivative            instrument may be greater than the amount invested in the derivative              instrument. Certain derivatives have the potential for unlimited losses,          regardless of the size of the initial investment.                                 ·  Preferred Stock Risk. Preferred stocks may be more volatile than fixed income    securities and are more correlated with the issuer's underlying common stock      than fixed income securities. Additionally, the dividend on a preferred stock    may be changed or omitted by the issuer.                                          ·  Foreign Securities and Emerging Markets Risk. The value of the Fund's foreign    investments may be adversely affected by changes in the foreign country's         exchange rates, political and social instability, changes in economic or          taxation policies, decreased illiquidity and increased volatility. Foreign        companies may be subject to less regulation than U.S. companies. Investment in    emerging markets involves additional risks, including less social, political      and economic stability, smaller securities markets and lower trading volume,      restrictive national policies and less developed legal structures.             ·  Currency Risk. The Fund is subject to the risk that foreign currencies will       decline in value relative to the U.S. dollar, or, in the case of hedging          positions, that the U.S. dollar will decline in value relative to the currency    being hedged.                                                                  ·  Loan Participation and Assignment Risk. Loan participations and assignments       involve special types of risk, including credit risk, interest rate risk,         liquidity risk, and the risks of being a lender. Bank loans (i.e., loan           participations and assignments), like other high yield corporate debt             obligations, have a higher risk of default and may be less liquid and/or          become illiquid.                                                                  ·  Newer Fund Risk. The Fund is newer with limited operating history and there       can be no assurance that the Fund will grow to or maintain an economically        viable size, in which case the Board may determine to liquidate the Fund.
Risk, Lose Money	rr_RiskLoseMoney	Losing all or a portion of your investment is a risk of investing in the Fund.
Bar Chart and Performance Table, Heading	rr_BarChartAndPerformanceTableHeading	Performance
Performance, Narrative	rr_PerformanceNarrativeTextBlock	The following performance information provides some indication of the risks of investing in the High Yield Fund. As of the date of this Prospectus, the Advisor Class has not commenced operations. For that reason, the performance information below is that of the Fund's Investor Class. The bar chart below shows the Fund's total return for one year. The table below illustrates how the Fund's average annual total returns for the 1-year and since inception periods compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available on the Fund's website at www.piamutualfunds.com or by calling the Fund toll-free at 1-800-251-1970.
Performance, Information Illustrates Variability of Returns	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following performance information provides some indication of the risks of investing in the High Yield Fund.
Performance, Availability Phone Number	rr_PerformanceAvailabilityPhone	1-800-251-1970
Performance, Availability Website Address	rr_PerformanceAvailabilityWebSiteAddress	www.piamutualfunds.com
Performance, Past Does Not Indicate Future	rr_PerformancePastDoesNotIndicateFuture	The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart, Heading	rr_BarChartHeading	Calendar Year Total Return as of December 31 - Investor Class
Bar Chart, Closing	rr_BarChartClosingTextBlock	During the period shown on the bar chart, the High Yield Fund's highest total return for a quarter was 5.48% (quarter ended December 31, 2011) and the lowest total return for a quarter was -4.11% (quarter ended September 30, 2011).
Index No Deduction for Fees, Expenses, Taxes	rr_IndexNoDeductionForFeesExpensesTaxes	reflects no deduction for fees, expenses or taxes
Performance Table, Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax returns were 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, and after-tax returns are not relevant to investors who hold shares of the High Yield Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts ("IRAs").
Performance Table, Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon the redemption of Fund shares.
Performance Table, Closing	rr_PerformanceTableClosingTextBlock	The after-tax returns were 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, and after-tax returns are not relevant to investors who hold shares of the High Yield Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts ("IRAs").    The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon the redemption of Fund shares.
Average Annual Returns, Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns (for the periods ended December 31, 2011) Investor Class	[1]
PIA High Yield Fund (Second Prospectus Summary) | PIA High Yield Fund | Barclays Capital U.S. Corporate High-Yield Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Barclays Capital U.S. Corporate High-Yield Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	4.98%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	4.98%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 31, 2010
PIA High Yield Fund (Second Prospectus Summary) | PIA High Yield Fund | Advisor Class
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Redemption Fee	rr_RedemptionFee	none
Management Fees	rr_ManagementFeesOverAssets	0.65%
Distribution and Service (Rule 12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	1.48%	[2]
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.03%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.41%	[3]
Less: Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(1.15%)
Net Annual Fund Operating Expenses	rr_NetExpensesOverAssets	1.26%	[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-03-30
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	128
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	641
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	1,181
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	2,659
Annual Return 2011	rr_AnnualReturn2011	4.49%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest total return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2011
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	5.48%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest total return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(4.11%)
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Return before taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	4.49%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	4.49%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 31, 2010
PIA High Yield Fund (Second Prospectus Summary) | PIA High Yield Fund | Advisor Class | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Return after taxes on distributions
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	2.58%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	2.58%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 31, 2010
PIA High Yield Fund (Second Prospectus Summary) | PIA High Yield Fund | Advisor Class | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Return after taxes on distributions and sale of Fund shares
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	2.90%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	2.90%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 31, 2010

[1] All of the classes of the High Yield Fund's shares are invested in the same portfolio of securities. The annual returns of the different classes of shares will differ only to the extent the expenses of the classes differ. The actual performance of the Advisor Class would have been lower than the Investor Class performance due to its higher fees and expenses.

[2] Other expenses are based on estimated customary Fund expenses for the current fiscal year.

[3] Total Annual Fund Operating Expenses do not correlate to the "Ratio of Expenses to Average Net Assets Before Fee Waivers and Expense Reimbursements" in the Financial Highlights of the statutory prospectus, which reflects the operating expenses of the Fund and does not include acquired fund fees and expenses ("AFFE").

[4] Pacific Income Advisers, Inc. (the "Adviser") has contractually agreed to waive all or a portion of its management fees and pay Fund expenses to ensure that Net Annual Fund Operating Expenses (excluding AFFE, interest, taxes and extraordinary expenses) do not exceed 1.23% of the Fund's average daily net assets the ("Expense Cap"). The Expense Cap will remain in effect through at least March 30, 2013, and may be terminated only by the Trust's Board of Trustees (the "Board" or the "Trustees"). The Adviser may request recoupment of previously waived fees and paid expenses from the Fund for three years from the date they were waived or paid, subject to the Expense Cap.