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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Nov. 30, 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 Mar. 30, 2020
Document Effective Date dei_DocumentEffectiveDate Mar. 30, 2020
Prospectus Date rr_ProspectusDate Mar. 30, 2020
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Semper MBS Total Return Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SEMPER MBS TOTAL RETURN FUND
Objective [Heading] rr_ObjectiveHeading Investment Objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Total Return Fund seeks to provide a high level of risk-adjusted current income and 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 Total Return Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in the Fund’s Class A shares. Certain financial intermediaries also may offer variations in Fund sales charges to their customers as described in Schedule A to the statutory Prospectus. More information about these and other discounts is available from your financial professional and in the “More About Class A Shares” section on page 28 of the Fund’s statutory Prospectus and the “Breakpoints/Volume Discounts and Sales Charge Waivers” section on page 51 of the Fund’s Statement of Additional Information (“SAI”), and Schedule A to the statutory Prospectus.
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 Total Return 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 118% of the average value of its portfolio
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 118.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example.
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of 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
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Total Return Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in mortgage-backed securities (“MBS”). MBS refers to a type of fixed income instrument that represents an interest in a pool of mortgages, including residential MBS (“RMBS”) and commercial MBS (“CMBS”), and includes securities issued by government sponsored entities (“agency MBS”). MBS, including RMBS and CMBS, include fixed and variable rate securities with underlying fixed or variable rate mortgage loans and securities issued by private entities (“non-agency MBS”). The weighted average maturity of the Fund’s MBS investments will generally range from between 1 and 10 years and the Fund may invest without limit in MBS that are rated below investment grade (i.e., “high yield” or “junk” ratings). The Adviser considers securities to be of investment grade quality if they are rated BBB (or comparable) or higher by a nationally recognized credit rating organization including Standard & Poor’s Ratings Services (“S&P”) and Moody’s Investors Service, Inc. (“Moody’s”), or if unrated, determined by the Adviser to be of comparable quality. As part of the Fund’s agency RMBS investments, the Fund may invest in credit risk transfer securities. Credit risk transfer securities are fixed- or floating-rate unsecured general obligations issued from time to time by Freddie Mac, Fannie Mae or other government sponsored entities. The Fund may also invest in asset-backed securities. The Fund may also invest without limit in Rule 144A securities, may invest up to 50% of its total assets in when-issued securities, and may invest up to 10% of its total assets in other investment companies, including exchange-traded funds (“ETFs”).
The Total Return Fund may sell securities short with respect to 100% of its total assets. A short sale is the sale by the Fund of a security which it does not own in anticipation of purchasing the same security in the future at a lower price to close the short position. In general, the Adviser will sell securities short in conjunction with long positions with similar characteristics for the purposes of managing certain risks (primarily interest rate and/or yield spread risk) or for capturing differences in value between two securities, and not for the purpose of forecasting the market’s direction. In many instances, the Fund will utilize forward-settling sales of agency RMBS where the underlying pools of mortgage loans are To Be Announced (“TBA”) securities for these short selling activities.
The Total Return Fund may employ hedging strategies to manage interest rate, credit spread and other risks. Accordingly, the Fund may invest without limit in options, futures and swaps (including interest rate swaps, credit default swaps, total return swaps and swaptions) and TBA securities. The Fund may also utilize leverage (i.e., borrow against a line of credit) as part of the portfolio management process, subject to the limits of the Investment Company Act of 1940, as amended (the “1940 Act”).
The Adviser selects the Total Return Fund’s investments based on quantitative analysis, including bottom-up, loan-level credit analysis and structural stress-testing, as well as top-down macro qualitative analysis, including outlook for the economy, interest rates and real estate fundamentals. The Fund’s annual portfolio turnover rate will generally be 100% or greater.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal market conditions, the Total Return Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in mortgage-backed securities (“MBS”)
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Losing all or a portion of your money on your investment is a risk of investing in the Total Return Fund. The following 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 Fund’s performance. 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. The Fund’s investments may decline in value due to factors affecting individual issuers (such as the results of supply and demand), or sectors within the securities markets. The value of a security or other investment also may go up or down due to general market conditions that are not specifically related to a particular issuer, such as real or perceived adverse economic conditions, changes in interest rates or exchange rates, or adverse investor sentiment generally. In addition, unexpected events and their aftermaths, such as the spread of deadly diseases; natural, environmental or man-made disasters; financial, political or social disruptions; terrorism and war; and other tragedies or catastrophes, can cause investor fear and panic, which can adversely affect the economies of many companies, sectors, nations, regions and the market in general, in ways that cannot necessarily be foreseen.
•
Management Risk. The Total Return Fund is an actively managed portfolio. The Adviser’s management practices and investment strategies might not work to produce the desired results.
•
Fixed-Income Securities Risk. Fixed-income (debt) securities are generally subject to the following risks:
◦
Credit Risk. The Fund’s investments are subject to the risk that issuers and/or counterparties will fail to make payments when due or default completely. Prices of the Fund’s investments may be adversely affected if any of the issuers or counterparties it is invested in are subject to an actual or perceived deterioration in their credit quality. Credit spreads may increase, which may reduce the market values of the Fund’s securities. Credit spread risk is the risk that economic and market conditions or any actual or perceived credit deterioration may lead to an increase in the credit spreads (i.e., the difference in yield between two securities of similar maturity but different credit quality) and a decline in price of the issuer’s securities.
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Extension Risk. If interest rates rise, repayments of principal on certain fixed-income securities may occur at a slower-than-expected rate and, as a result, the expected maturity of such securities could lengthen which could cause their value to decline.
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Interest Rate Risk. The value of the Fund’s investments in fixed-income securities will change based on changes in interest rates. If interest rates increase, the value of these investments generally declines. Securities with greater interest rate sensitivity and longer maturities generally are subject to greater fluctuations in value.
◦
Prepayment Risk. Issuers of securities held by the Total Return Fund may be able to prepay principal due on these securities, particularly during periods of declining interest rates. Securities subject to prepayment risk generally offer less potential for gains when interest rates decline, and may offer a greater potential for loss when interest rates rise. When securities are prepaid, the Total Return Fund may have to reinvest in securities with a lower yield. Prepayment risk is a major risk of MBS.
•
Risks Associated with Mortgage-Backed and Other Asset-Backed Securities. In addition to the risks associated with other fixed income securities, mortgage-backed and asset-backed securities are subject to certain other risks. The value of these securities will be influenced by the factors affecting the housing market or the other assets underlying such securities. As a result, during periods of declining asset values, difficult or frozen credit markets, significant changes in interest rates, or deteriorating economic conditions, mortgage-backed and asset-backed securities may decline in value, face valuation difficulties, become more volatile and/or become illiquid. The liquidity of these assets may change over time.
•
Residential Mortgage-Backed Securities Risk. RMBS are subject to the risks generally associated with mortgage-backed securities. RMBS may not be backed by the full faith and credit of the U.S. Government and are subject to risk of default on the underlying mortgages. RMBS issued by non-government entities may offer higher yields than those issued by government entities, but also may be subject to greater volatility than government issues. Delinquencies and defaults by borrowers in payments on the underlying mortgages, and the related losses, are affected by general economic conditions, the borrower’s equity in the mortgaged property and the borrower’s financial circumstances.
•
Credit Risk Transfer Securities Risk. Credit risk transfer securities are unguaranteed and unsecured debt securities issued by the government sponsored entity and therefore are not directly linked to or backed by the underlying mortgage loans. As a result, in the event that a government sponsored entity fails to pay principal or interest on its credit risk transfer securities or goes through a bankruptcy, insolvency or similar proceeding, holders of such credit risk transfer securities have no direct recourse to the underlying mortgage loans and will generally receive recovery on par with other unsecured note holders in such a scenario. The risks associated with an investment in credit risk transfer securities are different than the risks associated with an investment in mortgage-backed securities issued by Fannie Mae and Freddie Mac, or other government sponsored entities or issued by a private issuer, because some or all of the mortgage default or credit risk associated with the underlying mortgage loans is transferred to investors. As a result, investors in these securities could lose some or all of their investment in these securities if the underlying mortgage loans default.
•
Commercial Mortgage-Backed Securities Risk. CMBS are subject to the risks generally associated with mortgage-backed securities. CMBS may not be backed by the full faith and credit of the U.S. Government and are subject to risk of default on the underlying mortgages. CMBS issued by non-government entities may offer higher yields than those issued by government entities, but also may be subject to greater volatility than government issues. CMBS react differently to changes in interest rates than other bonds and the prices of CMBS may reflect adverse economic and market conditions. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of CMBS.
•
Concentration Risk. To the extent the Fund may concentrate its investments in a particular industry or sector; the Fund’s shares may be more volatile and fluctuate more than shares of a fund investing in a broader range of securities.
•
Privately Issued Mortgage-Related Securities Risk. MBS issued or guaranteed by private issuers is also known as “non-agency MBS”. Privately issued mortgage-backed securities generally offer a higher rate of interest (but greater credit risk) than securities issued by U.S. Government issuers, as there are no direct or indirect governmental guarantees of payment. The degree of risks will depend significantly on the ability of borrowers to make payments on the underlying mortgages and the seniority of the security held by the Fund with respect to such payments. The market for privately-issued mortgage-backed securities is smaller and less liquid than the market for mortgage-backed securities issued by U.S. government issuers.
•
Sub-Prime Mortgage Risk. The risk that an issuer of a sub-prime mortgage security will default on its payments of interest or principal on a security when due is more pronounced in the case of sub-prime mortgage instruments than more highly ranked securities. Because of this increased risk, these securities may also be less liquid and subject to more pronounced declines in value than more highly rated instruments in times of market stress.
•
U.S. Government Securities Risk. The Fund may invest in securities issued or guaranteed by the U.S. government or its agencies and instrumentalities (such as securities issued by the Government National Mortgage Association (Ginnie Mae), the Federal National Mortgage Association (Fannie Mae), or the Federal Home Loan Mortgage Corporation (Freddie Mac)). U.S. government securities are subject to market risk, interest rate risk and credit risk. Securities, such as those issued or guaranteed by Ginnie Mae or the U.S. Treasury, that are backed by the full faith and credit of the United States are guaranteed only as to the timely payment of interest and principal when held to maturity and the market prices for such securities will fluctuate. Notwithstanding that these securities are backed by the full faith and credit of the United States, circumstances could arise that would prevent the payment of interest or principal. This would result in losses to the Fund. Securities issued or guaranteed by U.S. government-related organizations, such as Fannie Mae and Freddie Mac, are not backed by the full faith and credit of the U.S. government and no assurance can be given that the U.S. government will provide financial support. Therefore, U.S. government-related organizations may not have the funds to meet their payment obligations in the future.
•
Risks Associated with Real Estate and Regulatory Actions. The securities that the Fund owns are dependent on real estate prices. If real estate experiences a significant price decline, this could adversely affect the prices of the securities the Fund owns. Any adverse regulatory action could impact the prices of the securities the Fund owns.
•
Rule 144A Securities Risk. The market for Rule 144A securities typically is less active than the market for publicly-traded securities. Rule 144A securities carry the risk that the liquidity of these securities may become impaired, making it more difficult for the Fund to sell these securities.
•
High Yield Risk. Fixed income securities that are rated below investment grade (i.e., “junk bonds”) are subject to additional risk factors due to the speculative nature of the securities, such as increased possibility of default liquidation of the security, and changes in value based on public perception of the issuer.
•
Derivatives Risk. Derivatives, including options, futures, and swaps, may be riskier than other types of investments and may increase the volatility of the Fund. Derivatives may be sensitive to changes in economic and market conditions and may create leverage, which could result in losses that significantly exceed the Fund’s original investment. Derivatives may not perform as expected, so the Fund may not realize the intended benefits. In addition, given their complexity, derivatives expose the Fund to risks of mispricing or improper valuation.
•
Counterparty Risk. Counterparty risk arises upon entering into borrowing arrangements or derivative transactions and is the risk from the potential inability of counterparties to meet the terms of their contracts.
•
Repurchase Agreement Risk. The counterparty to the repurchase agreement that sells the securities may default on its obligation to repurchase them. In this circumstance, the Fund may lose money because: it may not be able to sell the securities at the agreed-upon time and price, the securities may lose value before they can be sold, the selling institution may default or declare bankruptcy or the Fund may have difficulty exercising rights to the collateral.
•
Leverage Risk. Leverage can increase the investment returns of the Fund if the securities purchased increase in value in an amount exceeding the cost of the borrowing.  However, if the securities decrease in value, the Fund will suffer a greater loss than would have resulted without the use of leverage.
•
Short Sales Risk. Because making short sales in securities that it does not own exposes the Fund to the risks associated with those securities, such short sales involve speculative exposure risk. The Fund will incur a loss as a result of a short sale if the price of the security increases between the date of the short sale and the date on which the Fund replaces the security sold short. The Fund will realize a gain if the security declines in price between those dates. As a result, if the Fund makes short sales in securities that increase in value, it will likely underperform similar funds that do not make short sales in securities they do not own. There can be no assurance that the Fund will be able to close out a short sale position at any particular time or at an acceptable price. Although the Fund’s gain is limited only by the maximum attainable price of the security, its potential loss is limited only by the maximum attainable price of the security, less the price at which the security was sold. The Fund may also pay transaction costs and borrowing fees in connection with short sales.
•
TBA Securities Risk. In a TBA transaction, a seller agrees to deliver a security at a future date, but does not specify the particular security to be delivered. Instead, the seller agrees to accept any security that meets specified terms. The principal risks of TBA transactions are increased interest rate risk and increased overall investment exposure.
•
Liquidity Risk. Liquidity risk exists when particular investments are difficult to purchase or sell. The Fund’s investments in illiquid securities may reduce the returns of the Fund because it may be difficult to sell the illiquid securities at an advantageous time or price or achieve its desired level of exposure to a certain sector. Liquidity risk may be the result of, among other things, the reduced number and capacity of traditional market participants to make a market in fixed-income securities or the lack of an active market. Liquid investments may become illiquid or less liquid after purchase by the Fund, particularly during periods of market turmoil. Illiquid and relatively less liquid investments may be harder to value, especially in changing markets.
•
Investment Company Risk.  When the 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.
•
When-Issued Securities Risk.  The price or yield obtained in a when-issued transaction may be less favorable than the price or yield available in the market when the securities delivery takes place, or that failure of a party to a transaction to consummate the trade may result in a loss to the Fund or missing an opportunity to obtain a price considered advantageous.
•
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. A high portfolio turnover rate also leads to higher transactions costs.
Risk Lose Money [Text] rr_RiskLoseMoney Losing all or a portion of your money on your investment is a risk of investing in the Total Return 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 Total Return Fund. The bar chart shows the annual return for the Fund’s Institutional Class shares from year to year and does not reflect the sales charges applicable to Class A shares. If sales charges were included, the returns would be lower than those shown in the bar chart. The table shows how the Fund’s Institutional Class, Investor Class and Class A (reflecting the sales charges) average annual returns for the one-year, five-year and since inception periods compare to that 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 semperfunds.com/funds/total_return/performance.html or by calling the Fund toll-free at 1-855-736-7799 (855-SEM-PRXX).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Total Return Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-855-736-7799
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress semperfunds.com/funds/total_return/performance.html
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 Returns as of December 31 – Institutional Class
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart shows the annual return for the Fund’s Institutional Class shares from year to year and does not reflect the sales charges applicable to Class A shares.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the period shown on the bar chart, the Total Return Fund’s highest total return for a quarter was 2.95% (quarter ended June 30, 2014) and the lowest total return for a quarter was -1.10% (quarter ended March 31, 2016).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest total return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2014
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.95%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest total return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.10%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (For the periods ended December 31, 2019)
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 Total Return Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for the Institutional Class; after-tax returns for the Investor Class and Class A will vary to the extent they have different expenses.
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 Total Return Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). After-tax returns are shown only for the Institutional Class; after-tax returns for the Investor Class and Class A will vary to the extent they have different expenses. 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.
Semper MBS Total Return Fund | Bloomberg Barclays U.S. MBS Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Bloomberg Barclays U.S. MBS Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 6.35%
5 Years rr_AverageAnnualReturnYear05 2.58%
Since Inception rr_AverageAnnualReturnSinceInception 3.02%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 22, 2013
Semper MBS Total Return Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SEMOX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 0.50%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.59%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.02%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in the Fund’s Class A shares.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 302
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 518
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 752
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,423
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes [1]
1 Year rr_AverageAnnualReturnYear01 2.54% [1]
5 Years rr_AverageAnnualReturnYear05 3.86% [1]
Since Inception rr_AverageAnnualReturnSinceInception 5.72% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 22, 2013 [1]
Semper MBS Total Return Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SEMMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.59%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.77%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 79
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 246
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 428
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 954
Annual Return 2014 rr_AnnualReturn2014 9.33%
Annual Return 2015 rr_AnnualReturn2015 4.18%
Annual Return 2016 rr_AnnualReturn2016 3.38%
Annual Return 2017 rr_AnnualReturn2017 6.19%
Annual Return 2018 rr_AnnualReturn2018 3.89%
Annual Return 2019 rr_AnnualReturn2019 4.86%
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.86%
5 Years rr_AverageAnnualReturnYear05 4.50%
Since Inception rr_AverageAnnualReturnSinceInception 6.28%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 22, 2013
Semper MBS Total Return Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 2.77%
5 Years rr_AverageAnnualReturnYear05 2.09%
Since Inception rr_AverageAnnualReturnSinceInception 3.85%
Semper MBS Total Return Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 2.85%
5 Years rr_AverageAnnualReturnYear05 2.34%
Since Inception rr_AverageAnnualReturnSinceInception 3.74%
Semper MBS Total Return Fund | Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SEMPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.59%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 104
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 325
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 563
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,248
Label rr_AverageAnnualReturnLabel Investor Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.50%
5 Years rr_AverageAnnualReturnYear05 4.23%
Since Inception rr_AverageAnnualReturnSinceInception 6.01%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 22, 2013
Semper Short Duration Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SEMPER SHORT DURATION FUND
Objective [Heading] rr_ObjectiveHeading Investment Objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Short Duration Fund seeks to provide a high level of current income that is consistent with preservation of capital.
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 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 3/29/2021
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover.
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Short Duration 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 131% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 131.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Fund Operating Expenses After Fee Waiver do not correlate to the Ratio of Expenses to Average Net Assets Before Fee Waiver and Expense Reimbursement in the Financial Highlights section of the statutory prospectus, which reflects the actual operating expenses of the Short Duration Fund and does not include 0.01% that is attributed to acquired fund fees and expenses (“AFFE”).
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 Short Duration 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).
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
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the Short Duration Fund invests primarily in investment-grade debt securities of domestic entities. The Adviser considers securities to be of investment grade quality if they are rated BBB (or comparable) or higher by a nationally recognized credit rating organization including Standard & Poor’s Ratings Services (“S&P”) and Moody’s Investors Service, Inc. (“Moody’s”), or if unrated, determined by the Adviser to be of comparable quality. The Fund may hold securities that, after being purchased, are downgraded to non-investment grade and would no longer qualify for initial investment. Under normal circumstances, the Fund expects to maintain a weighted average portfolio duration of up to three (3) years. The Fund defines duration as effective duration which is the interest rate sensitivity of projected cash flows from Fund securities, adjusted for amortization, prepayments, and expected calls and puts. This means that the price of a debt security with a duration of three years would be expected to decrease by approximately 3% with a 1% increase in interest rates. The Fund believes that effective duration provides the most accurate estimation of the Fund’s interest rate sensitivity.
The Short Duration Fund may invest in asset-backed securities (“ABS”), including mortgage-backed securities (“MBS”). MBS refers to a type of fixed income instrument that represents an interest in a pool of mortgages, including residential MBS (“RMBS”), commercial MBS (“CMBS”) and securities issued by government sponsored entities (“agency MBS”). MBS, including CMBS and RMBS, include fixed and variable rate securities with underlying fixed or variable rate mortgage loans and securities issued by private entities (“non-agency MBS”). As part of the Fund’s agency RMBS investments, the Fund may invest in credit risk transfer securities. Credit risk transfer securities are fixed- or floating-rate unsecured general obligations issued from time to time by Freddie Mac, Fannie Mae or other government sponsored entities.
Debt securities may include all fixed-income securities (both fixed and floating-rate securities), Rule 144A securities, U.S. Government securities, municipal securities, collateralized loan obligations (“CLOs”), special purpose entities (such as asset-backed or mortgage-backed security issuers), zero coupon securities, money market securities, repurchase agreements and private asset-backed loan participations. Certain asset-backed and mortgage-backed securities are issued with stated maturities of 15 to 40 years; however, their effective durations are generally under 3 years. U.S. Government securities include U.S. Treasury bills, notes and other obligations that are issued by or guaranteed as to interest and principal by the U.S. Government or by agencies or instrumentalities of the U.S. Government. The Fund may also invest in high yield instruments that are rated below investment grade (i.e., “high yield” or “junk” ratings). The Fund may also invest up to 10% of its total assets in other investment companies, including exchange-traded funds (“ETFs”).
The Short Duration Fund may sell securities short with respect to 25% of its total assets. A short sale is the sale by the Short Duration Fund of a security which it does not own in anticipation of purchasing the same security in the future at a lower price to close the short position.  The Adviser will primarily sell securities short for the purposes of managing certain risks (primarily interest rate and/or yield spread risk) associated with its long positions or for capturing differences in value between two securities, and not for the purpose of forecasting the market’s direction. As a result, short sales will primarily be used for hedging purposes, not for speculative purposes. In many instances, the Fund will utilize forward-settling sales of agency RMBS where the underlying pools of mortgage loans are To Be Announced (“TBA”) securities for these short selling activities.
The Adviser will allocate the Short Duration Fund’s assets across different market sectors and different maturities based on its view of the relative value of each sector or maturity. The Short Duration Fund may purchase and sell securities for a variety of reasons, such as to adjust the portfolio’s average maturity, duration, or credit quality or to shift assets into and out of higher yielding or lower yielding securities or different sectors.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Losing all or a portion of your money on your investment is a risk of investing in the Short Duration Fund. The following additional risks could affect the value of your investment:

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Market and Regulatory Risk. Events in the financial markets and economy may cause volatility and uncertainty and adversely impact the Fund’s performance. 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. The Fund’s investments may decline in value due to factors affecting individual issuers (such as the results of supply and demand), or sectors within the securities markets. The value of a security or other investment also may go up or down due to general market conditions that are not specifically related to a particular issuer, such as real or perceived adverse economic conditions, changes in interest rates or exchange rates, or adverse investor sentiment generally. In addition, unexpected events and their aftermaths, such as the spread of deadly diseases; natural, environmental or man-made disasters; financial, political or social disruptions; terrorism and war; and other tragedies or catastrophes, can cause investor fear and panic, which can adversely affect the economies of many companies, sectors, nations, regions and the market in general, in ways that cannot necessarily be foreseen.
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Management Risk. The Fund is an actively managed portfolio. The Adviser’s management practices and investment strategies might not work to produce the desired results.
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Fixed-Income Securities Risk. Fixed-income (debt) securities are generally subject to the following risks:
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Credit Risk. The Fund’s investments are subject to the risk that issuers and/or counterparties will fail to make payments when due or default completely. Prices of the Fund’s investments may be adversely affected if any of the issuers or counterparties it is invested in are subject to an actual or perceived deterioration in their credit quality. Credit spreads may increase, which may reduce the market values of the Fund’s securities. Credit spread risk is the risk that economic and market conditions or any actual or perceived credit deterioration may lead to an increase in the credit spreads (i.e., the difference in yield between two securities of similar maturity but different credit quality) and a decline in price of the issuer’s securities.
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Extension Risk. If interest rates rise, repayments of principal on certain fixed-income securities may occur at a slower-than-expected rate and, as a result, the expected maturity of such securities could lengthen which could cause their value to decline.
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Interest Rate Risk. The value of the Fund’s investments in fixed-income securities will change based on changes in interest rates. If interest rates increase, the value of these investments generally declines. Securities with greater interest rate sensitivity and longer maturities generally are subject to greater fluctuations in value.
◦
Prepayment Risk. Issuers of securities held by the Fund may be able to prepay principal due on these securities, particularly during periods of declining interest rates. Securities subject to prepayment risk generally offer less potential for gains when interest rates decline, and may offer a greater potential for loss when interest rates rise. When securities are prepaid, the Short Duration Fund may have to reinvest in securities with a lower yield.
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Risks Associated with Mortgage-Backed and Other Asset-Backed Securities. In addition to the risks associated with other fixed income securities, mortgage-backed and asset-backed securities are subject to certain other risks. The value of these securities will be influenced by the factors affecting the housing market or the other assets underlying such securities. As a result, during periods of declining asset values, difficult or frozen credit markets, significant changes in interest rates, or deteriorating economic conditions, mortgage-backed and asset-backed securities may decline in value, face valuation difficulties, become more volatile and/or become illiquid. The liquidity of these assets may change over time.
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Residential Mortgage-Backed Securities Risk. RMBS are subject to the risks generally associated with mortgage-backed securities. RMBS may not be backed by the full faith and credit of the U.S. Government and are subject to risk of default on the underlying mortgages. RMBS issued by non-government entities may offer higher yields than those issued by government entities, but also may be subject to greater volatility than government issues. Delinquencies and defaults by borrowers in payments on the underlying mortgages, and the related losses, are affected by general economic conditions, the borrower’s equity in the mortgaged property and the borrower’s financial circumstances.
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Credit Risk Transfer Securities Risk. Credit risk transfer securities are unguaranteed and unsecured debt securities issued by the government sponsored entity and therefore are not directly linked to or backed by the underlying mortgage loans. As a result, in the event that a government sponsored entity fails to pay principal or interest on its credit risk transfer securities or goes through a bankruptcy, insolvency or similar proceeding, holders of such credit risk transfer securities have no direct recourse to the underlying mortgage loans and will generally receive recovery on par with other unsecured note holders in such a scenario. The risks associated with an investment in credit risk transfer securities are different than the risks associated with an investment in mortgage-backed securities issued by Fannie Mae and Freddie Mac, or other government sponsored entities or issued by a private issuer, because some or all of the mortgage default or credit risk associated with the underlying mortgage loans is transferred to investors. As a result, investors in these securities could lose some or all of their investment in these securities if the underlying mortgage loans default.
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Commercial Mortgage-Backed Securities Risk. CMBS are subject to the risks generally associated with mortgage-backed securities. CMBS may not be backed by the full faith and credit of the U.S. Government and are subject to risk of default on the underlying mortgages. CMBS issued by non-government entities may offer higher yields than those issued by government entities, but also may be subject to greater volatility than government issues. CMBS react differently to changes in interest rates than other bonds and the prices of CMBS may reflect adverse economic and market conditions. Small movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of CMBS.
•
Privately Issued Mortgage-Related Securities Risk. MBS issued or guaranteed by private issuers is also known as “non-agency MBS”. Privately issued mortgage-backed securities generally offer a higher rate of interest (but greater credit risk) than securities issued by U.S. Government issuers, as there are no direct or indirect governmental guarantees of payment. The degree of risks will depend significantly on the ability of borrowers to make payments on the underlying mortgages and the seniority of the security held by the Fund with respect to such payments. The market for privately-issued mortgage-backed securities is smaller and less liquid than the market for mortgage-backed securities issued by U.S. government issuers.
•
Sub-Prime Mortgage Risk. The risk that an issuer of a sub-prime mortgage security will default on its payments of interest or principal on a security when due is more pronounced in the case of sub-prime mortgage instruments than more highly ranked securities. Because of this increased risk, these securities may also be less liquid and subject to more pronounced declines in value than more highly rated instruments in times of market stress.
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Risks Associated with Real Estate and Regulatory Actions. The securities that the Fund owns are dependent on real estate prices. If real estate experiences a significant price decline, this could adversely affect the prices of the securities the Fund owns. Any adverse regulatory action could impact the prices of the securities the Fund owns.
•
Rule 144A Securities Risk. The market for Rule 144A securities typically is less active than the market for publicly-traded securities. Rule 144A securities carry the risk that the liquidity of these securities may become impaired, making it more difficult for the Fund to sell these securities.
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Collateralized Loan Obligation Risk. Collateralized loan obligations are generally subject to credit, interest rate, valuation, liquidity, prepayment and extension risks. These securities also are subject to risk of default on the underlying asset, particularly during periods of economic downturn. The market value of collateralized loan obligations may be affected by, among other things, changes in the market value of the underlying assets held by the CLO, changes in the distributions on the underlying assets, defaults and recoveries on the underlying assets, capital gains and losses on the underlying assets, prepayments on underlying assets and the availability, prices and interest rates of underlying assets.
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High Yield Risk. Fixed income securities that are rated below investment grade (i.e., “junk bonds”) are subject to additional risk factors due to the speculative nature of the securities, such as increased possibility of default liquidation of the security, and changes in value based on public perception of the issuer.
•
Derivatives Risk. Derivatives, including options, futures, and swaps, may be riskier than other types of investments and may increase the volatility of the Fund. Derivatives may be sensitive to changes in economic and market conditions and may create leverage, which could result in losses that significantly exceed the Fund’s original investment. Derivatives may not perform as expected, so the Fund may not realize the intended benefits. In addition, given their complexity, derivatives expose the Fund to risks of mispricing or improper valuation.
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Counterparty Risk. Counterparty risk arises upon entering into borrowing arrangements or derivative transactions and is the risk from the potential inability of counterparties to meet the terms of their contracts.
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Leverage Risk. Leverage is the practice of borrowing money to purchase securities.  Leverage can increase the investment returns of the Fund if the securities purchased increase in value in an amount exceeding the cost of the borrowing.  However, if the securities decrease in value, the Fund will suffer a greater loss than would have resulted without the use of leverage.
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TBA Securities Risk. In a TBA transaction, a seller agrees to deliver a security at a future date, but does not specify the particular security to be delivered. Instead, the seller agrees to accept any security that meets specified terms. The principal risks of TBA transactions are increased interest rate risk and increased overall investment exposure.
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Liquidity Risk. Liquidity risk exists when particular investments are difficult to purchase or sell. The Fund’s investments in illiquid securities may reduce the returns of the Fund because it may be difficult to sell the illiquid securities at an advantageous time or price or achieve its desired level of exposure to a certain sector. Liquidity risk may be the result of, among other things, the reduced number and capacity of traditional market participants to make a market in fixed-income securities or the lack of an active market. Liquid investments may become illiquid or less liquid after purchase by the Short Duration Fund, particularly during periods of market turmoil. Illiquid and relatively less liquid investments may be harder to value, especially in changing markets.
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Investment Company Risk.  When the 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.
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When-Issued Securities Risk.  The price or yield obtained in a when-issued transaction may be less favorable than the price or yield available in the market when the securities delivery takes place, or that failure of a party to a transaction to consummate the trade may result in a loss to the Fund or missing an opportunity to obtain a price considered advantageous.
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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. A high portfolio turnover rate also leads to higher transactions costs.
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Repurchase Agreement Risk. Repurchase agreement risk is the risk the counterparty to the repurchase agreement that sells the securities may default on its obligation to repurchase them. In this circumstance, the Fund may lose money because: it may not be able to sell the securities at the agreed-upon time and price, the securities may lose value before they can be sold, the selling institution may default or declare bankruptcy or the Fund may have difficulty exercising rights to the collateral.
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Municipal Securities Risk. The amount of public information available about municipal securities is generally less than that for corporate securities. Special factors, such as legislative changes, and economic and business developments, may adversely affect the yield and/or value of the Fund’s investments in municipal securities. Other factors include the general conditions of the municipal securities market, the size of the particular offering, the maturity of the obligation, and the rating of the issue. Changes in economic, business or political conditions relating to a particular municipal project, municipality, or state in which the Fund invests may have an impact on the Fund’s share price.
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U.S. Government Securities Risk. The Fund may invest in securities issued or guaranteed by the U.S. government or its agencies and instrumentalities (such as securities issued by the Government National Mortgage Association (Ginnie Mae), the Federal National Mortgage Association (Fannie Mae), or the Federal Home Loan Mortgage Corporation (Freddie Mac)). U.S. government securities are subject to market risk, interest rate risk and credit risk. Securities, such as those issued or guaranteed by Ginnie Mae or the U.S. Treasury, that are backed by the full faith and credit of the United States are guaranteed only as to the timely payment of interest and principal when held to maturity and the market prices for such securities will fluctuate. Notwithstanding that these securities are backed by the full faith and credit of the United States, circumstances could arise that would prevent the payment of interest or principal. This would result in losses to the Fund. Securities issued or guaranteed by U.S. government-related organizations, such as Fannie Mae and Freddie Mac, are not backed by the full faith and credit of the U.S. government and no assurance can be given that the U.S. government will provide financial support. Therefore, U.S. government-related organizations may not have the funds to meet their payment obligations in the future.
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Short Sales Risk. Because making short sales in securities that it does not own exposes the Fund to the risks associated with those securities, such short sales involve speculative exposure risk. The Fund will incur a loss as a result of a short sale if the price of the security increases between the date of the short sale and the date on which the Fund replaces the security sold short. The Fund will realize a gain if the security declines in price between those dates. As a result, if the Fund makes short sales in securities that increase in value, it will likely underperform similar funds that do not make short sales in securities they do not own. There can be no assurance that the Fund will be able to close out a short sale position at any particular time or at an acceptable price. Although the Fund’s gain is limited only by the maximum attainable price of the security, its potential loss is limited only by the maximum attainable price of the security, less the price at which the security was sold. The Fund may also pay transaction costs and borrowing fees in connection with short sales.
Risk Lose Money [Text] rr_RiskLoseMoney Losing all or a portion of your money on your investment is a risk of investing in the Short Duration Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The Short Duration Fund was organized on March 28, 2014 to acquire the assets and liabilities of the Semper Short Duration Fund, a series of Forum Funds (the “Predecessor Fund”), in exchange for shares of the Fund. Accordingly, the Fund is the successor to the Predecessor Fund, and the following performance information shown prior to March 28, 2014, is that of the Predecessor Fund. The Fund has an investment objective, strategies and policies substantially similar to the Predecessor Fund, which was also advised by the Adviser. The following information provides some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year. The bar chart shows changes in the Institutional Class’ performance from year to year. The table shows how the Fund’s Institutional Class and Investor Class average annual returns for the one-year, five-year and since inception periods compare with those of broad measures 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 at semperfunds.com/funds/short_duration/performance.html or by calling the Fund toll-free at 1-855-736-7799 (855-SEM-PRXX).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-855-736-7799
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress semperfunds.com/funds/short_duration/performance.html
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 Returns as of December 31 – Institutional Class
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the period of time shown in the bar chart, the Fund’s highest return for a calendar quarter was 1.41% (quarter ended March 31, 2012) and the lowest return for a calendar quarter was -0.94% (quarter ended June 30, 2013).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.41%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (0.94%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (For the periods ended December 31, 2019)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Short Duration Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown The after-tax returns are shown only for the Institutional Class; the after-tax returns for the Investor Class will vary to the extent it has different expenses.
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
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Short Duration Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). The after-tax returns are shown only for the Institutional Class; the after-tax returns for the Investor Class will vary to the extent it has different expenses. 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.
Semper Short Duration Fund | Bloomberg Barclays 1-3 Year Government Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Bloomberg Barclays 1-3 Year Government Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 3.59%
5 Years rr_AverageAnnualReturnYear05 1.40%
Since Inception rr_AverageAnnualReturnSinceInception 1.14%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 23, 2010
Semper Short Duration Fund | Bloomberg Barclays 1-3 U.S. Treasury Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Bloomberg Barclays 1-3 Year U.S. Treasury Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 3.59%
5 Years rr_AverageAnnualReturnYear05 1.39%
Since Inception rr_AverageAnnualReturnSinceInception 1.12%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 23, 2010
Semper Short Duration Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SEMIX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.35%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.31%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.66%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%)
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.61% [2],[3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 62
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 206
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 363
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 818
Annual Return 2011 rr_AnnualReturn2011 4.20%
Annual Return 2012 rr_AnnualReturn2012 3.83%
Annual Return 2013 rr_AnnualReturn2013 0.23%
Annual Return 2014 rr_AnnualReturn2014 2.77%
Annual Return 2015 rr_AnnualReturn2015 0.90%
Annual Return 2016 rr_AnnualReturn2016 2.39%
Annual Return 2017 rr_AnnualReturn2017 3.03%
Annual Return 2018 rr_AnnualReturn2018 2.33%
Annual Return 2019 rr_AnnualReturn2019 3.60%
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.60%
5 Years rr_AverageAnnualReturnYear05 2.45%
Since Inception rr_AverageAnnualReturnSinceInception 2.61%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 23, 2010
Semper Short Duration Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 2.28%
5 Years rr_AverageAnnualReturnYear05 1.17%
Since Inception rr_AverageAnnualReturnSinceInception 1.48%
Semper Short Duration Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 2.12%
5 Years rr_AverageAnnualReturnYear05 1.29%
Since Inception rr_AverageAnnualReturnSinceInception 1.51%
Semper Short Duration Fund | Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SEMRX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.35%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.31%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.91%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%)
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.86% [2],[3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 88
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 285
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 499
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,115
Label rr_AverageAnnualReturnLabel Investor Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.45%
5 Years rr_AverageAnnualReturnYear05 2.20%
Since Inception rr_AverageAnnualReturnSinceInception 2.35%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 23, 2010
[1] The Institutional Class and Investor Class incepted on July 22, 2013, and Class A incepted on December 18, 2015. Class A performance for the period from July 22, 2013 to December 18, 2015, reflects the performance of the Institutional Class, adjusted to reflect Class A fees and expenses.
[2] Semper Capital Management, L.P. (the “Adviser”) has contractually agreed to waive a portion or all of its management fees and pay Fund expenses to ensure that Total Annual Fund Operating Expenses After Fee Waiver (excluding AFFE, taxes, interest expense, dividends on securities sold short, extraordinary expenses, Rule 12b-1 fees, shareholder servicing fees and any other class-specific expenses) do not exceed 0.60% of average daily net assets of the Fund (the “Expense Cap”). The Expense Cap will remain in effect through at least March 29, 2021 and may be terminated only by Advisors Series Trust’s (the “Trust”) 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 paid, subject to the Expense Cap.
[3] Total Annual Fund Operating Expenses After Fee Waiver do not correlate to the Ratio of Expenses to Average Net Assets Before Fee Waiver and Expense Reimbursement in the Financial Highlights section of the statutory prospectus, which reflects the actual operating expenses of the Short Duration Fund and does not include 0.01% that is attributed to acquired fund fees and expenses (“AFFE”).