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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Jul. 31, 2019
Entity Registrant Name dei_EntityRegistrantName ADVISORS SERIES TRUST
Entity Central Index Key dei_EntityCentralIndexKey 0001027596
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Nov. 25, 2019
Document Effective Date dei_DocumentEffectiveDate Nov. 28, 2019
Prospectus Date rr_ProspectusDate Nov. 28, 2019
Entity Inv Company Type dei_EntityInvCompanyType N-1A
O'Shaughnessy Market Leaders Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading O’Shaughnessy Market Leaders Value Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The O’Shaughnessy Market Leaders Value Fund’s (the “Value Fund”) investment objective is to seek long-term capital appreciation and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold shares of the Value 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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Value 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 Value Fund’s portfolio turnover rate was 54% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 54.00%
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 Value 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.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Value Fund invests primarily in a diversified portfolio of common stocks and other equity securities of companies of all sizes, including but not limited to, American Depositary Receipts (“ADRs”), preferred stocks, limited partnerships, and convertible securities. The Adviser employs a bottom-up, quantitative, factor-based approach to security selection based on research and analysis of historical data. The Adviser may eliminate or substitute factors at its discretion. Portfolio securities may be sold generally upon periodic rebalancings of the Fund’s portfolio. For selling decisions, the Adviser considers the same factors it uses in evaluating a security for purchase and generally sells securities when it believes such securities no longer meet its investment criteria. The Fund may from time to time emphasize investment in certain sectors of the market. As of July 31, 2019, 33% of the Fund’s total investments were invested in the financials sector.
The Adviser screens securities using a factor-based model that seeks to identify market leading companies by analysis of a number of factors including, but not limited to, low valuations, strong financial strength, conservative earnings reporting (earnings quality), strong earnings growth, market capitalization and volume. The Value Fund selects companies that offer a strong “shareholder yield” – the combination of dividend yield and the rate at which the company is buying back shares of its stock – at the time of initial purchase. While stocks often have both a strong dividend yield and a high rate of share repurchases, that may not always be the case. An individual stock may be deemed to be attractive even if its entire shareholder yield is generated from either dividends or share repurchases. Due to ongoing research, the Adviser may modify the characteristics utilized in the investment strategy, without prior notice to shareholders, in order to better achieve the investment objective.
The Value Fund will primarily invest in common stocks of U.S. issuers but may also invest up to 20% of its total assets in common stocks of foreign securities and issuers, which may also include issuers located in emerging markets and frontier markets, also known as “pre-emerging markets,” as defined by countries listed on the Morgan Stanley Capital International (“MSCI”) Emerging Markets Index and/or the MSCI Frontier Markets Index. The Value Fund may invest up to 25% of its total assets in real estate investment trusts (“REITs”) or foreign real estate companies. The Fund may also invest up to 20% of its total assets in depositary receipts of foreign based companies (i.e. ADRs, European Depositary Receipts (“EDRs”), and Global Depositary Receipts (“GDRs”), etc.) whose common stock is not itself listed on a U.S. exchange. Depositary receipts may be purchased through “sponsored” or “unsponsored” facilities. A sponsored facility is established jointly by the issuer of the underlying security and a depositary, whereas a depositary may establish an unsponsored facility without participation by the issuer of the depositary security. The Fund may invest up to 10% of its total assets in other investment companies, including exchange-traded funds (“ETFs”).
The Value Fund may also invest up to 100% of the Fund’s total assets in cash, cash equivalents, and high-quality, short-term debt securities, money market mutual funds and money market instruments for temporary defensive purposes. The Fund may also invest up to 50% of its total assets in ETFs that are aligned with the Fund’s principal investment strategies, for temporary defensive purposes.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Losing all or a portion of your investment is a risk of investing in the Value Fund. The following principal risks could affect the value of your investment:
•
Market and Regulatory Risk.  Events in the financial markets and economy may cause volatility and uncertainty and adversely impact the Value Fund’s performance. Market events may affect a single issuer, industry, sector, or the market as a whole. Traditionally liquid investments may experience periods of diminished liquidity. Governmental and regulatory actions, including tax law changes, may also impair portfolio management and have unexpected or adverse consequences on particular markets, strategies, or investments.
•
Equity Securities Risk. The price of equity securities may rise or fall because of economic or political changes or changes in a company’s financial condition, sometimes rapidly or unpredictably. These price movements may result from factors affecting individual companies, sectors or industries selected for the Value Fund’s portfolio or the securities market as a whole, such as changes in economic or political conditions. The values of convertible securities tend to decline as interest rates rise and, because of the conversion feature, tend to vary with fluctuations in the market value of the underlying equity security.
•
Management Risk. The Value Fund is an actively managed portfolio. The Adviser’s management practices and investment strategies might not work to meet the Fund’s investment objective.
•
Foreign Securities and Emerging Markets Risk. The risks of investing in the securities of foreign issuers, including depositary receipts, can include fluctuations in foreign currencies, foreign currency exchange controls, political and economic instability, differences in securities regulation and trading, and foreign taxation issues. These risks are greater in emerging markets.
•
Frontier Markets Risk. There is an additional increased risk of price volatility associated with frontier market countries (pre-emerging markets), which may be further magnified by currency fluctuations relative to the U.S. dollar. Frontier market countries generally have smaller economies or less developed capital markets than in more advanced emerging markets and, as a result, the risks of investing in emerging market countries may be magnified in frontier market countries.
•
Large-Sized Companies Risk. Larger, more established companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. In addition, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.
•
REITs and Foreign Real Estate Company Risk. Investing in REITs and foreign real estate companies makes the Fund more susceptible to risks associated with the ownership of real estate and with the real estate industry in general, as well as tax compliance risks, and may involve duplication of management fees and other expenses. REITs and foreign real estate companies may be less diversified than other pools of securities, may have lower trading volumes and may be subject to more abrupt or erratic price movements than the overall securities markets.
•
Small- and Medium-Sized Companies Risk. Small- and medium-sized companies often have less predictable earnings, more limited product lines, markets, distribution channels or financial resources and the management of such companies may be dependent upon one or few key people. The market movements of equity securities of small- and medium-sized companies may be more abrupt and volatile than the market movements of equity securities of larger, more established companies or the stock market in general and small-sized companies in particular, are generally less liquid than the equity securities of larger companies.
•
Depositary Receipts Risk. The Value Fund’s equity investments may take the form of sponsored or unsponsored depositary receipts. Holders of unsponsored depositary receipts generally bear all the costs of such facilities and the depositary of an unsponsored facility frequently is under no obligation to distribute shareholder communications received from the issuer of the deposited security or to pass through voting rights to the holders of such receipts of the deposited securities.
•
Value Style Investing Risk. At times when the value investing style is out of favor, the Fund may underperform other funds that use different investing styles. Value stocks may be purchased based upon the belief that a given security may be out of favor; that belief may be misplaced or the security may stay out of favor for an extended period of time.
•
Sector Risk. To the extent the Value Fund invests a significant portion of its assets in the securities of companies in the same sector of the market, the Fund is more susceptible to economic, political, regulatory and other occurrences influencing those sectors.
◦
Financials Sector Risk. The Value Fund currently invests a significant portion of its assets in the financial sector, and therefore the performance of the Fund could be negatively impacted by events affecting this sector.  This sector can be significantly affected by changes in interest rates, government regulation, the rate of defaults on corporate, consumer and government debt and the availability and cost of capital.  During the recent market downturn, numerous financial services companies have experienced substantial declines in the valuations of their assets, taken action to raise capital (such as the issuance of debt or equity securities), or even ceased operations.
•
Investment Company Risk. When the Value Fund invests in an ETF or mutual fund, it will bear additional expenses based on its pro rata share of the ETF’s or mutual fund’s operating expenses, including the potential duplication of management fees. The risk of owning an ETF or mutual fund generally reflects the risks of owning the underlying securities the ETF or mutual fund holds. The Fund also will incur brokerage costs when it purchases ETFs.
Risk Lose Money [Text] rr_RiskLoseMoney Losing all or a portion of your investment is a risk of investing in the Value Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Value Fund. The bar chart shows the annual return for the Fund’s Class I shares from year to year. The table shows how the Fund’s average annual returns for 1 year and since inception 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.osfunds.com or by calling the Fund toll-free at 1-877-291-7827.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Value Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-877-291-7827
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.osfunds.com
Performance Past Does Not Indicate Future [Text] 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 – Class I
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
The Fund’s calendar year-to-date return as of September 30, 2019 was 17.17%.
During the period of time shown in the bar chart, the Fund’s highest quarterly return was 8.50% for the quarter ended December 31, 2017 and the lowest quarterly return was -17.02% for the quarter ended December 31, 2018.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 17.17%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2017
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.50%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.02%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the period ended December 31, 2018)
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 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 Value 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 redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block] 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 Value 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 redemption and provides an assumed tax deduction that benefits the investor.
O'Shaughnessy Market Leaders Value Fund | Russell 1000 Value® Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 1000 Value® Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (8.27%)
Since Inception rr_AverageAnnualReturnSinceInception 9.07%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 26, 2016
O'Shaughnessy Market Leaders Value Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol OFVIX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.17%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.59%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 60
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 189
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 329
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 738
Annual Return 2017 rr_AnnualReturn2017 24.64%
Annual Return 2018 rr_AnnualReturn2018 (12.93%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (12.93%)
Since Inception rr_AverageAnnualReturnSinceInception 9.57%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 26, 2016
O'Shaughnessy Market Leaders Value Fund | Class I | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (14.37%)
Since Inception rr_AverageAnnualReturnSinceInception 8.51%
O'Shaughnessy Market Leaders Value Fund | Class I | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 (6.56%)
Since Inception rr_AverageAnnualReturnSinceInception 7.48%
O'Shaughnessy Small Cap Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading O’Shaughnessy Small Cap Value Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The O’Shaughnessy Small Cap Value Fund’s (the “Small Cap Fund”) investment objective is to seek long-term capital appreciation and income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold shares of the Small Cap 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 11/28/2020
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Small Cap 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 Small Cap Fund’s portfolio turnover rate was 75% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 75.00%
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 Small Cap 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 contractual Expense Cap only in the first year).
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Small Cap Fund invests at least 80% of its net assets (including any borrowings for investment purposes) in a diversified portfolio of common stocks of small cap companies. Shareholders will receive at least 60 days’ prior written notice before a change in this 80% policy. Under current market conditions, the Adviser defines a small cap company as a company with a market capitalization range (at time of initial purchase or rebalance) of those that are included in the Russell 2000 Value® Index (which consisted of companies with capitalizations from approximately $11.2 million up to approximately $5.1 billion as of August 31, 2019). The Fund may from time to time emphasize investment in certain sectors of the market. As of July 31, 2019, 26% of the Fund’s total investments were invested in the financials sector.
The Adviser employs a bottom-up, quantitative, factor-based approach for security selection based on research and analysis of historical data. The Adviser screens for companies within the market capitalization range. The Adviser then screens securities for companies that are priced cheaply relative to their fundamentals, such as sales, earnings and cash flows. In selecting securities, the Adviser evaluates factors that may include, but are not limited to: avoiding names with recent poor price momentum, companies with strong financial strength, conservative earnings reporting (earnings quality) and strong earnings growth. The Adviser may eliminate or substitute factors at its discretion. Portfolio securities may be sold generally upon periodic rebalancings of the Small Cap Fund’s portfolio. For selling decisions, the Adviser considers the same factors it uses in evaluating a security for purchase and generally sells securities when it believes such securities no longer meet its investment criteria.
The Small Cap Fund will primarily invest in common stocks of U.S. issuers but may also invest up to 20% of its total assets in common stocks of foreign securities and issuers, which may also include issuers located in emerging markets and frontier markets, also known as “pre-emerging markets,” as defined by countries listed on the Morgan Stanley Capital International (“MSCI”) Emerging Markets Index and/or the MSCI Frontier Markets Index. The Small Cap Fund may invest up to 25% of its total assets in real estate investment trusts (“REITs”) or foreign real estate companies. The Fund may also invest up to 20% of its total assets in depositary receipts of foreign based companies (i.e. American Depositary Receipts (“ADRs”), European Depositary Receipts (“EDRs”), and Global Depositary Receipts (“GDRs”), etc.) whose common stock is not itself listed on a U.S. exchange. Depositary receipts may be purchased through “sponsored” or “unsponsored” facilities. A sponsored facility is established jointly by the issuer of the underlying security and a depositary, whereas a depositary may establish an unsponsored facility without participation by the issuer of the depositary security. The Fund may invest up to 10% of its total assets in other investment companies, including exchange-traded funds (“ETFs”).
The Small Cap Fund may also invest up to 100% of the Fund’s total assets in cash, cash equivalents, and high-quality, short-term debt securities, money market mutual funds and money market instruments for temporary defensive purposes. The Fund may also invest up to 50% of its total assets in ETFs that are aligned with the Fund’s principal investment strategies, for temporary defensive purposes.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Losing all or a portion of your investment is a risk of investing in the Small Cap Fund. The following principal risks could affect the value of your investment:
•
Market and Regulatory Risk.  Events in the financial markets and economy may cause volatility and uncertainty and adversely impact the Small Cap Fund’s performance. Market events may affect a single issuer, industry, sector, or the market as a whole. Traditionally liquid investments may experience periods of diminished liquidity. Governmental and regulatory actions, including tax law changes, may also impair portfolio management and have unexpected or adverse consequences on particular markets, strategies, or investments.
•
Equity Securities Risk. The price of equity securities may rise or fall because of economic or political changes or changes in a company’s financial condition, sometimes rapidly or unpredictably. These price movements may result from factors affecting individual companies, sectors or industries selected for the Small Cap Fund’s portfolio or the securities market as a whole, such as changes in economic or political conditions.
•
Management Risk. The Small Cap Fund is an actively managed portfolio. The Adviser’s management practices and investment strategies might not work to meet the Fund’s investment objective.
•
REITs and Foreign Real Estate Company Risk. Investing in REITs and foreign real estate companies makes the Fund more susceptible to risks associated with the ownership of real estate and with the real estate industry in general, as well as tax compliance risks, and may involve duplication of management fees and other expenses. REITs and foreign real estate companies may be less diversified than other pools of securities, may have lower trading volumes and may be subject to more abrupt or erratic price movements than the overall securities markets.
•
Small-Sized Company Risk. Investing in securities of small-sized companies may involve greater volatility than investing in larger and more established companies because companies with small market capitalizations can be subject to more abrupt or erratic share price changes than larger, more established companies. Additionally, due to the lower amount of trading volume associated with small cap companies, there is a risk of occasional trading challenges due to liquidity issues. Liquidity issues can negatively affect performance by increasing the costs associated with trading in and out of positions.
•
Small- and Medium-Sized Companies Risk. Small- and medium-sized companies often have less predictable earnings, more limited product lines, markets, distribution channels or financial resources and the management of such companies may be dependent upon one or few key people. The market movements of equity securities of small- and medium-sized companies may be more abrupt and volatile than the market movements of equity securities of larger, more established companies or the stock market in general and small-sized companies in particular, are generally less liquid than the equity securities of larger companies.
•
Foreign Securities and Emerging Markets Risk. The risks of investing in the securities of foreign issuers, including depositary receipts, can include fluctuations in foreign currencies, foreign currency exchange controls, political and economic instability, differences in securities regulation and trading, and foreign taxation issues. These risks are greater in emerging markets.
•
Frontier Markets Risk. There is an additional increased risk of price volatility associated with frontier market countries (pre-emerging markets), which may be further magnified by currency fluctuations relative to the U.S. dollar. Frontier market countries generally have smaller economies or less developed capital markets than in more advanced emerging markets and, as a result, the risks of investing in emerging market countries may be magnified in frontier market countries.
•
Depositary Receipts Risk. The Small Cap Fund’s equity investments may take the form of sponsored or unsponsored depositary receipts. Holders of unsponsored depositary receipts generally bear all the costs of such facilities and the depositary of an unsponsored facility frequently is under no obligation to distribute shareholder communications received from the issuer of the deposited security or to pass through voting rights to the holders of such receipts of the deposited securities.
•
Value Style Investing Risk. At times when the value investing style is out of favor, the Fund may underperform other funds that use different investing styles. Value stocks may be purchased based upon the belief that a given security may be out of favor; that belief may be misplaced or the security may stay out of favor for an extended period of time.
•
Sector Risk. To the extent the Small Cap Fund invests a significant portion of its assets in the securities of companies in the same sector of the market, the Fund is more susceptible to economic, political, regulatory and other occurrences influencing those sectors.
◦
Financials Sector Risk. The Small Cap Fund currently invests a significant portion of its assets in the financial sector, and therefore the performance of the Fund could be negatively impacted by events affecting this sector.  This sector can be significantly affected by changes in interest rates, government regulation, the rate of defaults on corporate, consumer and government debt and the availability and cost of capital.  During the recent market downturn, numerous financial services companies have experienced substantial declines in the valuations of their assets, taken action to raise capital (such as the issuance of debt or equity securities), or even ceased operations.
•
Investment Company Risk. When the Small Cap Fund invests in an ETF or mutual fund, it will bear additional expenses based on its pro rata share of the ETF’s or mutual fund’s operating expenses, including the potential duplication of management fees. The risk of owning an ETF or mutual fund generally reflects the risks of owning the underlying securities the ETF or mutual fund holds. The Fund also will incur brokerage costs when it purchases ETFs.
Risk Lose Money [Text] rr_RiskLoseMoney Losing all or a portion of your investment is a risk of investing in the Small Cap Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Small Cap Fund. The bar chart shows the annual return for the Fund’s Class I shares from year to year. The table shows how the Fund’s average annual returns for 1 year and since inception 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.osfunds.com or by calling the Fund toll-free at 1-877-291-7827.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Small Cap Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-877-291-7827
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.osfunds.com
Performance Past Does Not Indicate Future [Text] 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 – Class I
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
The Fund’s calendar year-to-date return as of September 30, 2019 was 4.68%.
During the period of time shown in the bar chart, the Fund’s highest quarterly return was 8.04% for the quarter ended June 30, 2018 and the lowest quarterly return was -19.40% for the quarter ended December 31, 2018.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 4.68%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2018
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.04%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.40%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the period ended December 31, 2018)
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 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 Small Cap 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 redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block] 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 Small Cap 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 redemption and provides an assumed tax deduction that benefits the investor.
O'Shaughnessy Small Cap Value Fund | Russell 2000 Value® Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 2000 Value® Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (12.86%)
Since Inception rr_AverageAnnualReturnSinceInception 10.15%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 26, 2016
O'Shaughnessy Small Cap Value Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol OFSIX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.99%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.79%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.80%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.99%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 101
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 485
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 895
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,039
Annual Return 2017 rr_AnnualReturn2017 11.24%
Annual Return 2018 rr_AnnualReturn2018 (14.45%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (14.45%)
Since Inception rr_AverageAnnualReturnSinceInception 7.63%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 26, 2016
O'Shaughnessy Small Cap Value Fund | Class I | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (15.24%)
Since Inception rr_AverageAnnualReturnSinceInception 6.72%
O'Shaughnessy Small Cap Value Fund | Class I | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 (7.94%)
Since Inception rr_AverageAnnualReturnSinceInception 5.98%
O'Shaughnessy Small/Mid Cap Growth Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading O’Shaughnessy Small/Mid Cap Growth Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The O’Shaughnessy Small/Mid Cap Growth Fund’s (the “Small/Mid Cap Growth Fund”) investment objective is to seek long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold shares of the Small/Mid Cap Growth 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 11/27/2020
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Small/Mid Cap Growth 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 109% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 109.00%
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 Small/Mid Cap Growth 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 contractual Expense Cap only in the first year).
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Small/Mid Cap Growth Fund invests at least 80% of its net assets (including any borrowings for investment purposes) in common stocks and other equity securities of small- and medium-sized companies. Shareholders will receive at least 60 days’ prior written notice before a change in this 80% policy. Under current market conditions, the Adviser defines small- and medium-sized companies by reference to those companies within the capitalization range of the Russell 2500™ Index (which consisted of companies with capitalizations from approximately $6.4 million up to approximately $15.5 billion as of August 31, 2019). The Fund may from time to time emphasize investment in certain sectors of the market. As of July 31, 2019, 26% of the Fund’s total investments were invested in the information technology sector.
The Adviser employs a proprietary quantitatively-driven approach to security selection based on research and analysis of historical data. The Adviser screens securities for attractive growth characteristics using a factor-based model. In selecting securities, the Adviser evaluates factors that may include, but are not limited to: market capitalization, trading volume, valuation metrics, earnings and price momentum over time. The Adviser may eliminate or substitute factors at its discretion. Portfolio securities may be sold generally upon periodic rebalancings of the Small/Mid Cap Growth Fund’s portfolio. For selling decisions, the Adviser considers the same factors it uses in evaluating a security for purchase and generally sells securities when it believes such securities no longer meet its investment criteria.
The Small/Mid Cap Growth Fund invests primarily in common stocks and other equity securities, including preferred stocks, convertible securities, rights and warrants to purchase common stock and depositary receipts. The Fund may invest up to 50% of its total assets in the securities of foreign issuers, including those in emerging markets, and may invest up to 25% of its total assets in real estate investment trusts (“REITs”) or foreign real estate companies. The Fund may invest up to 10% of its total assets in other investment companies, including exchange-traded funds (“ETFs”). The Fund’s investment strategy may result in a portfolio turnover rate in excess of 100% on an annual basis.
The Small/Mid Cap Growth Fund may also invest up to 100% of the Fund’s total assets in cash, cash equivalents, and high-quality, short-term debt securities, money market mutual funds and money market instruments for temporary defensive purposes. The Fund may also invest up to 50% of its total assets in ETFs that are aligned with the Fund’s principal investment strategies, for temporary defensive purposes.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Losing all or a portion of your investment is a risk of investing in the Small/Mid Cap Growth Fund. The following principal risks could affect the value of your investment:
•
Market and Regulatory Risk.  Events in the financial markets and economy may cause volatility and uncertainty and adversely impact the Small/Mid Cap Growth Fund’s performance. Market events may affect a single issuer, industry, sector, or the market as a whole. Traditionally liquid investments may experience periods of diminished liquidity. Governmental and regulatory actions, including tax law changes, may also impair portfolio management and have unexpected or adverse consequences on particular markets, strategies, or investments.
•
Equity Securities Risk. The price of equity securities may rise or fall because of economic or political changes or changes in a company’s financial condition, sometimes rapidly or unpredictably. These price movements may result from factors affecting individual companies, sectors or industries selected for the Small/Mid Cap Growth Fund’s portfolio or the securities market as a whole, such as changes in economic or political conditions. The values of convertible securities tend to decline as interest rates rise and, because of the conversion feature, tend to vary with fluctuations in the market value of the underlying equity security.
•
Management Risk. The Small/Mid Cap Growth Fund is an actively managed portfolio. The Adviser’s management practices and investment strategies might not work to meet the Fund’s investment objective.
•
Small- and Medium-Sized Companies Risk. Small- and medium-sized companies often have less predictable earnings, more limited product lines, markets, distribution channels or financial resources and the management of such companies may be dependent upon one or few key people. The market movements of equity securities of small- and medium-sized companies may be more abrupt and volatile than the market movements of equity securities of larger, more established companies or the stock market in general and small-sized companies in particular, are generally less liquid than the equity securities of larger companies.
•
Growth Stock Risk. The risk that growth style companies lose value or move out of favor. Growth style companies also may be more sensitive to changes in current or expected earnings than the prices of other stocks.
•
Sector Risk. To the extent the Small/Mid Cap Growth Fund invests a significant portion of its assets in the securities of companies in the same sector of the market, the Fund is more susceptible to economic, political, regulatory and other occurrences influencing those sectors.
◦
Information Technology Sector Risk. Information technology companies face intense competition, both domestically and internationally, which may have an adverse effect on profit margins. Like other technology companies, information technology companies may have limited product lines, markets, financial resources or personnel. The products of information technology companies may face product obsolescence due to rapid technological developments and frequent new product introduction, unpredictable changes in growth rates and competition for the services of qualified personnel. Technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market.
•
Foreign Securities and Emerging Markets Risk. The risks of investing in the securities of foreign issuers, including emerging market issuers and depositary receipts, can include fluctuations in foreign currencies, foreign currency exchange controls, political and economic instability, differences in securities regulation and trading, and foreign taxation issues. These risks are greater in emerging markets.
•
Depositary Receipts Risk. The Small/Mid Cap Growth Fund’s equity investments may take the form of sponsored or unsponsored depositary receipts. Holders of unsponsored depositary receipts generally bear all the costs of such facilities and the depositary of an unsponsored facility frequently is under no obligation to distribute shareholder communications received from the issuer of the deposited security or to pass through voting rights to the holders of such receipts of the deposited securities.
•
REITs and Foreign Real Estate Company Risk. Investing in REITs and foreign real estate companies makes the Small/Mid Cap Growth Fund more susceptible to risks associated with the ownership of real estate and with the real estate industry in general, as well as tax compliance risks, and may involve duplication of management fees and other expenses. REITs and foreign real estate companies may be less diversified than other pools of securities, may have lower trading volumes and may be subject to more abrupt or erratic price movements than the overall securities markets.
•
Investment Company Risk. When the Small/Mid Cap Growth Fund invests in an ETF or mutual fund, it will bear additional expenses based on its pro rata share of the ETF’s or mutual fund’s operating expenses, including the potential duplication of management fees. The risk of owning an ETF or mutual fund generally reflects the risks of owning the underlying securities the ETF or mutual fund holds. The Fund also will incur brokerage costs when it purchases ETFs.
•
Portfolio Turnover Risk. A high portfolio turnover rate (100% or more) has the potential to result in the realization and distribution to shareholders of higher capital gains, which may subject you to a higher tax liability. High portfolio turnover also necessarily results in greater transaction costs which may reduce Fund performance.
Risk Lose Money [Text] rr_RiskLoseMoney Losing all or a portion of your investment is a risk of investing in the Small/Mid Cap Growth Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Small/Mid Cap Growth Fund. The bar chart shows the Fund’s Class I shares’ annual return from year to year. The table shows how the Fund’s average annual returns for the 1-year, 5-year and since inception periods compare with those of a broad measure of market performance. The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future. Updated performance information is available by calling 1-877-291-7827 or by visiting www.osfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Small/Mid Cap Growth Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-877-291-7827
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.osfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Return as of December 31 – Class I
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
The Fund’s year-to-date return as of September 30, 2019 was 12.81%.
During the period of time shown in the bar chart, the Fund’s highest quarterly return was 14.22% for the quarter ended March 31, 2013, and the lowest quarterly return was -24.74% for the quarter ended September 30, 2011.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 12.81%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2013
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.22%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.74%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the period ended December 31, 2018)
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 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 Small/Mid Cap Growth 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 redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block] 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 Small/Mid Cap Growth 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 redemption and provides an assumed tax deduction that benefits the investor.
O'Shaughnessy Small/Mid Cap Growth Fund | Russell 2500 Growth™ Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 2500 Growth™ Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (7.47%)
5 Years rr_AverageAnnualReturnYear05 6.19%
Since Inception rr_AverageAnnualReturnSinceInception 13.06%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 16, 2010
O'Shaughnessy Small/Mid Cap Growth Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol OFMIX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.18%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.78%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.59%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 121
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 503
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 909
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,046
Annual Return 2011 rr_AnnualReturn2011 (12.43%)
Annual Return 2012 rr_AnnualReturn2012 19.52%
Annual Return 2013 rr_AnnualReturn2013 42.83%
Annual Return 2014 rr_AnnualReturn2014 (0.89%)
Annual Return 2015 rr_AnnualReturn2015 (0.27%)
Annual Return 2016 rr_AnnualReturn2016 14.66%
Annual Return 2017 rr_AnnualReturn2017 13.85%
Annual Return 2018 rr_AnnualReturn2018 (8.05%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (8.05%)
5 Years rr_AverageAnnualReturnYear05 3.48%
Since Inception rr_AverageAnnualReturnSinceInception 10.16%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 16, 2010
O'Shaughnessy Small/Mid Cap Growth Fund | Class I | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (11.74%)
5 Years rr_AverageAnnualReturnYear05 1.28%
Since Inception rr_AverageAnnualReturnSinceInception 8.29%
O'Shaughnessy Small/Mid Cap Growth Fund | Class I | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 (1.89%)
5 Years rr_AverageAnnualReturnYear05 2.65%
Since Inception rr_AverageAnnualReturnSinceInception 8.18%
[1] O’Shaughnessy Asset Management, LLC (the “Adviser”) has contractually agreed to waive all or a portion of its management fees and pay expenses of the Fund to ensure that Total Annual Fund Operating Expenses (excluding acquired fund fees and expenses (“AFFE”), interest, taxes and extraordinary expenses) do not exceed 0.99% of average daily net assets of the Fund (the “Expense Cap”). The Expense Cap will remain in effect through at least November 28, 2020, and may be terminated only by the Trust’s Board of Trustees (the “Board”). The Adviser may request recoupment of previously waived fees and paid expenses from the Fund for 36 months from the date they were waived or paid, subject to the Expense Cap.
[2] O’Shaughnessy Asset Management, LLC (the “Adviser”) has contractually agreed to waive all or a portion of its management fees and pay expenses of the Fund to ensure that Total Annual Fund Operating Expenses (excluding acquired fund fees and expenses (“AFFE”), interest, taxes and extraordinary expenses) do not exceed 1.19% of average daily net assets of the Fund (the “Expense Cap”). The Expense Cap will remain in effect through at least November 27, 2020, and may be terminated only by the Trust’s Board of Trustees (the “Board”). The Adviser may request recoupment of previously waived fees and paid expenses from the Fund for 36 months from the date they were waived or paid, subject to the Expense Cap.